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synced 2025-10-31 15:50:51 +03:00
08f192f81b
The problem was that we restored SQL_CACHE, SQL_NO_CACHE flags in SELECT statement from internal structures based on value set later at runtime, not the original value set by the user. The solution is to remember that original value.
1271 lines
54 KiB
Plaintext
1271 lines
54 KiB
Plaintext
set GLOBAL query_cache_size=1355776;
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flush query cache;
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flush query cache;
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reset query cache;
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flush status;
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drop table if exists t1,t2,t3,t4,t11,t21;
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drop database if exists mysqltest;
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create table t1 (a int not null);
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insert into t1 values (1),(2),(3);
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select * from t1;
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a
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1
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2
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3
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select * from t1;
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a
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1
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2
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3
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select sql_no_cache * from t1;
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a
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1
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2
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3
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select length(now()) from t1;
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length(now())
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19
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19
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19
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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show status like "Qcache_inserts";
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Variable_name Value
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Qcache_inserts 1
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 1
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drop table t1;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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create table t1 (a int not null);
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insert into t1 values (1),(2),(3);
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create table t2 (a int not null);
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insert into t2 values (4),(5),(6);
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create table t3 (a int not null) engine=MERGE UNION=(t1,t2) INSERT_METHOD=FIRST;
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select * from t3;
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a
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1
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2
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3
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4
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5
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6
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select * from t3;
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a
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1
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2
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3
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4
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5
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6
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 2
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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insert into t2 values (7);
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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select * from t1;
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a
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1
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2
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3
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select * from t1;
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a
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1
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2
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3
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 3
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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insert into t3 values (8);
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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select * from t3;
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a
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1
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2
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3
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8
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4
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5
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6
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7
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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update t2 set a=9 where a=7;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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select * from t1;
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a
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1
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2
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3
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8
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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update t3 set a=10 where a=1;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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select * from t3;
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a
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10
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2
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3
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8
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4
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5
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6
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9
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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delete from t2 where a=9;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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select * from t1;
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a
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10
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2
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3
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8
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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delete from t3 where a=10;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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drop table t1, t2, t3;
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set query_cache_type=demand;
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create table t1 (a int not null);
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insert into t1 values (1),(2),(3);
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select * from t1;
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a
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1
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2
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3
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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select sql_cache * from t1 union select * from t1;
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a
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1
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2
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3
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set query_cache_type=2;
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select sql_cache * from t1 union select * from t1;
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a
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1
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2
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3
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select * from t1 union select sql_cache * from t1;
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a
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1
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2
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3
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 4
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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set query_cache_type=on;
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reset query cache;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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select sql_no_cache * from t1;
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a
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1
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2
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3
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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drop table t1;
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create table t1 (a text not null);
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select CONNECTION_ID() from t1;
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CONNECTION_ID()
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select FOUND_ROWS();
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FOUND_ROWS()
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0
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select NOW() from t1;
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NOW()
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select CURDATE() from t1;
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CURDATE()
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select CURTIME() from t1;
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CURTIME()
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select DATABASE() from t1;
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DATABASE()
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select ENCRYPT("test") from t1;
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ENCRYPT("test")
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select LAST_INSERT_ID() from t1;
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LAST_INSERT_ID()
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select RAND() from t1;
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RAND()
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select UNIX_TIMESTAMP() from t1;
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UNIX_TIMESTAMP()
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select USER() from t1;
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USER()
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select CURRENT_USER() from t1;
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CURRENT_USER()
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select benchmark(1,1) from t1;
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benchmark(1,1)
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explain extended select benchmark(1,1) from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 0 const row not found
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Warnings:
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Note 1003 select benchmark(1,1) AS `benchmark(1,1)` from `test`.`t1`
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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create table t2 (a text not null);
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insert into t1 values("1111111111111111111111111111111111111111111111111111");
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 4
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show status like "Qcache_lowmem_prunes";
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Variable_name Value
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Qcache_lowmem_prunes 0
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select a as a1, a as a2 from t1;
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select a as a2, a as a3 from t1;
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select a as a3, a as a4 from t1;
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select a as a1, a as a2 from t1;
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 4
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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show status like "Qcache_lowmem_prunes";
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Variable_name Value
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Qcache_lowmem_prunes 2
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reset query cache;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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select * from t1;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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drop table t1,t2;
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create database mysqltest;
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create table mysqltest.t1 (i int not null auto_increment, a int, primary key (i));
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insert into mysqltest.t1 (a) values (1);
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select * from mysqltest.t1 where i is null;
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i a
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1 1
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create table t1(a int);
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select * from t1;
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a
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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select * from mysqltest.t1;
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i a
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1 1
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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drop database mysqltest;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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drop table t1;
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create table t1 (a char(1) not null collate koi8r_general_ci);
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insert into t1 values(_koi8r"<22>");
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set CHARACTER SET koi8r;
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select * from t1;
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a
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<EFBFBD>
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set CHARACTER SET cp1251_koi8;
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select * from t1;
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a
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<EFBFBD>
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set CHARACTER SET DEFAULT;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 4
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drop table t1;
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create database if not exists mysqltest;
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create table mysqltest.t1 (i int not null);
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create table t1 (i int not null);
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insert into mysqltest.t1 (i) values (1);
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insert into t1 (i) values (2);
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select * from t1;
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i
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2
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use mysqltest;
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select * from t1;
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i
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1
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select * from t1;
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i
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1
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use test;
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select * from t1;
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i
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2
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 6
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drop database mysqltest;
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drop table t1;
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create table t1 (i int not null);
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insert into t1 (i) values (1),(2),(3),(4);
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select SQL_CALC_FOUND_ROWS * from t1 limit 2;
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i
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1
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2
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select FOUND_ROWS();
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FOUND_ROWS()
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4
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 6
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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select * from t1 where i=1;
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i
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1
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select FOUND_ROWS();
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FOUND_ROWS()
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1
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 6
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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select SQL_CALC_FOUND_ROWS * from t1 limit 2;
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i
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1
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2
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select FOUND_ROWS();
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FOUND_ROWS()
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4
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 7
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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select * from t1 where i=1;
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i
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1
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select FOUND_ROWS();
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FOUND_ROWS()
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1
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 8
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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drop table t1;
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flush query cache;
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reset query cache;
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create table t1 (a int not null);
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insert into t1 values (1),(2),(3);
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select * from t1;
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a
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1
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2
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3
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select * from t1;
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a
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1
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2
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3
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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insert delayed into t1 values (4);
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select a from t1;
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a
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1
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2
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3
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4
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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drop table t1;
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 0
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show global variables like "query_cache_min_res_unit";
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Variable_name Value
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query_cache_min_res_unit 4096
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set GLOBAL query_cache_min_res_unit=1001;
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show global variables like "query_cache_min_res_unit";
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Variable_name Value
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query_cache_min_res_unit 1008
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create table t1 (a int not null);
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insert into t1 values (1),(2),(3);
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create table t2 (a int not null);
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insert into t2 values (1),(2),(3);
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select * from t1;
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a
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1
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2
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3
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select * from t1;
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a
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1
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2
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3
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select * from t2;
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a
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1
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2
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3
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select * from t2;
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a
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1
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2
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3
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 11
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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drop table t1;
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select a from t2;
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a
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1
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2
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3
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select a from t2;
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a
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1
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2
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3
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 12
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 2
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drop table t2;
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set GLOBAL query_cache_min_res_unit=default;
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show global variables like "query_cache_min_res_unit";
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Variable_name Value
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query_cache_min_res_unit 4096
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create table t1 (a int not null);
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insert into t1 values (1);
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select "aaa" from t1;
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aaa
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aaa
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select "AAA" from t1;
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AAA
|
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AAA
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drop table t1;
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create table t1 (a int);
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set GLOBAL query_cache_size=1000;
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show global variables like "query_cache_size";
|
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Variable_name Value
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query_cache_size 0
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select * from t1;
|
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a
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set GLOBAL query_cache_size=1024;
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Warnings:
|
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Warning 1282 Query cache failed to set size 1024; new query cache size is 0
|
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show global variables like "query_cache_size";
|
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Variable_name Value
|
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query_cache_size 0
|
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select * from t1;
|
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a
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set GLOBAL query_cache_size=10240;
|
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Warnings:
|
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Warning 1282 Query cache failed to set size 10240; new query cache size is 0
|
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show global variables like "query_cache_size";
|
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Variable_name Value
|
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query_cache_size 0
|
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select * from t1;
|
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a
|
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set GLOBAL query_cache_size=20480;
|
||
Warnings:
|
||
Warning 1282 Query cache failed to set size 20480; new query cache size is 0
|
||
show global variables like "query_cache_size";
|
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Variable_name Value
|
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query_cache_size 0
|
||
select * from t1;
|
||
a
|
||
set GLOBAL query_cache_size=40960;
|
||
Warnings:
|
||
Warning 1282 Query cache failed to set size 40960; new query cache size is 0
|
||
show global variables like "query_cache_size";
|
||
Variable_name Value
|
||
query_cache_size 0
|
||
select * from t1;
|
||
a
|
||
set GLOBAL query_cache_size=51200;
|
||
show global variables like "query_cache_size";
|
||
Variable_name Value
|
||
query_cache_size 51200
|
||
select * from t1;
|
||
a
|
||
set GLOBAL query_cache_size=61440;
|
||
show global variables like "query_cache_size";
|
||
Variable_name Value
|
||
query_cache_size 61440
|
||
select * from t1;
|
||
a
|
||
set GLOBAL query_cache_size=81920;
|
||
show global variables like "query_cache_size";
|
||
Variable_name Value
|
||
query_cache_size 81920
|
||
select * from t1;
|
||
a
|
||
set GLOBAL query_cache_size=102400;
|
||
show global variables like "query_cache_size";
|
||
Variable_name Value
|
||
query_cache_size 102400
|
||
select * from t1;
|
||
a
|
||
drop table t1;
|
||
set GLOBAL query_cache_size=1048576;
|
||
create table t1 (i int not null);
|
||
create table t2 (i int not null);
|
||
select * from t1;
|
||
i
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
create temporary table t3 (i int not null);
|
||
select * from t2;
|
||
i
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 2
|
||
select * from t3;
|
||
i
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 2
|
||
update t1 set i=(select distinct 1 from (select * from t2) a);
|
||
drop table t1, t2, t3;
|
||
use mysql;
|
||
select * from db;
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
use test;
|
||
select * from mysql.db;
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
create table t1(id int auto_increment primary key);
|
||
insert into t1 values (NULL), (NULL), (NULL);
|
||
select * from t1 where id=2;
|
||
id
|
||
2
|
||
alter table t1 rename to t2;
|
||
select * from t1 where id=2;
|
||
ERROR 42S02: Table 'test.t1' doesn't exist
|
||
drop table t2;
|
||
select * from t1 where id=2;
|
||
ERROR 42S02: Table 'test.t1' doesn't exist
|
||
create table t1 (word char(20) not null);
|
||
select * from t1;
|
||
word
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
load data infile 'TEST_DIR/std_data/words.dat' into table t1;
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
select count(*) from t1;
|
||
count(*)
|
||
70
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
insert into t1 values (1),(2),(3);
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
select * from t1 into outfile "query_cache.out.file";
|
||
select * from t1 into outfile "query_cache.out.file";
|
||
ERROR HY000: File 'query_cache.out.file' already exists
|
||
select * from t1 limit 1 into dumpfile "query_cache.dump.file";
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
insert into t1 values (1),(2);
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
select * from t1;
|
||
a
|
||
1
|
||
2
|
||
SET OPTION SQL_SELECT_LIMIT=1;
|
||
select * from t1;
|
||
a
|
||
1
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 2
|
||
SET OPTION SQL_SELECT_LIMIT=DEFAULT;
|
||
drop table t1;
|
||
flush query cache;
|
||
reset query cache;
|
||
flush status;
|
||
set GLOBAL query_cache_size=1048576;
|
||
create table t1 (a int not null);
|
||
insert into t1 values (1),(2),(3);
|
||
create table t2 (a text not null);
|
||
create table t3 (a text not null);
|
||
insert into t3 values("1111111111111111111111111111111111111111111111111111");
|
||
insert into t2 select * from t3;
|
||
insert into t3 select * from t2;
|
||
insert into t2 select * from t3;
|
||
insert into t3 select * from t2;
|
||
insert into t2 select * from t3;
|
||
insert into t3 select * from t2;
|
||
insert into t2 select * from t3;
|
||
insert into t3 select * from t2;
|
||
insert into t2 select * from t3;
|
||
insert into t3 select * from t2;
|
||
drop table t2;
|
||
create table t2 (a int not null);
|
||
insert into t2 values (1),(2),(3);
|
||
create table t4 (a int not null);
|
||
insert into t4 values (1),(2),(3);
|
||
select * from t4;
|
||
select * from t2;
|
||
select * from t1 as tt, t1 as ttt where tt.a=1 and ttt.a=2;
|
||
select * from t2;
|
||
select * from t4;
|
||
select * from t1 as tt, t1 as ttt where tt.a=1 and ttt.a=2;
|
||
select * from t2;
|
||
select * from t4;
|
||
select * from t1 as tt, t1 as ttt where tt.a=1 and ttt.a=2;
|
||
delete from t2 where a=1;
|
||
flush query cache;
|
||
select * from t3;
|
||
delete from t4 where a=1;
|
||
flush query cache;
|
||
drop table t1,t2,t3,t4;
|
||
set query_cache_wlock_invalidate=1;
|
||
create table t1 (a int not null);
|
||
create table t2 (a int not null);
|
||
select * from t1;
|
||
a
|
||
select * from t2;
|
||
a
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 2
|
||
lock table t1 write, t2 read;
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
unlock table;
|
||
drop table t1,t2;
|
||
set query_cache_wlock_invalidate=default;
|
||
CREATE TABLE t1 (id INT PRIMARY KEY);
|
||
insert into t1 values (1),(2),(3);
|
||
select * from t1;
|
||
id
|
||
1
|
||
2
|
||
3
|
||
create temporary table t1 (a int not null auto_increment
|
||
primary key);
|
||
select * from t1;
|
||
a
|
||
drop table t1;
|
||
drop table t1;
|
||
SET NAMES koi8r;
|
||
CREATE TABLE t1 (a char(1) character set koi8r);
|
||
INSERT INTO t1 VALUES (_koi8r'<27>'),(_koi8r'<27>');
|
||
SELECT a,'<27>','<27>'='<27>' FROM t1;
|
||
a <09> '<27>'='<27>'
|
||
<EFBFBD> <09> 1
|
||
<EFBFBD> <09> 1
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 6
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
set collation_connection=koi8r_bin;
|
||
SELECT a,'<27>','<27>'='<27>' FROM t1;
|
||
a <09> '<27>'='<27>'
|
||
<EFBFBD> <09> 0
|
||
<EFBFBD> <09> 0
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 6
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 2
|
||
set character_set_client=cp1251;
|
||
SELECT a,'<27>','<27>'='<27>' FROM t1;
|
||
a <09> '<27>'='<27>'
|
||
<EFBFBD> <09> 0
|
||
<EFBFBD> <09> 0
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 6
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 3
|
||
set character_set_results=cp1251;
|
||
SELECT a,'<27>','<27>'='<27>' FROM t1;
|
||
a <09> '<27>'='<27>'
|
||
<EFBFBD> <09> 0
|
||
<EFBFBD> <09> 0
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 6
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 4
|
||
SET NAMES default;
|
||
DROP TABLE t1;
|
||
CREATE TABLE t1 (a int(1));
|
||
CREATE DATABASE mysqltest;
|
||
USE mysqltest;
|
||
DROP DATABASE mysqltest;
|
||
SELECT * FROM test.t1;
|
||
a
|
||
USE test;
|
||
DROP TABLE t1;
|
||
set character_set_results=null;
|
||
select @@character_set_results;
|
||
@@character_set_results
|
||
NULL
|
||
set character_set_results=default;
|
||
set GLOBAL query_cache_size=1355776;
|
||
create table t1 (id int auto_increment primary key, c char(25));
|
||
insert into t1 set c = repeat('x',24);
|
||
insert into t1 set c = concat(repeat('x',24),'x');
|
||
insert into t1 set c = concat(repeat('x',24),'w');
|
||
insert into t1 set c = concat(repeat('x',24),'y');
|
||
set max_sort_length=200;
|
||
select c from t1 order by c, id;
|
||
c
|
||
xxxxxxxxxxxxxxxxxxxxxxxx
|
||
xxxxxxxxxxxxxxxxxxxxxxxxw
|
||
xxxxxxxxxxxxxxxxxxxxxxxxx
|
||
xxxxxxxxxxxxxxxxxxxxxxxxy
|
||
reset query cache;
|
||
set max_sort_length=20;
|
||
select c from t1 order by c, id;
|
||
c
|
||
xxxxxxxxxxxxxxxxxxxxxxxx
|
||
xxxxxxxxxxxxxxxxxxxxxxxxx
|
||
xxxxxxxxxxxxxxxxxxxxxxxxw
|
||
xxxxxxxxxxxxxxxxxxxxxxxxy
|
||
set max_sort_length=200;
|
||
select c from t1 order by c, id;
|
||
c
|
||
xxxxxxxxxxxxxxxxxxxxxxxx
|
||
xxxxxxxxxxxxxxxxxxxxxxxxw
|
||
xxxxxxxxxxxxxxxxxxxxxxxxx
|
||
xxxxxxxxxxxxxxxxxxxxxxxxy
|
||
set max_sort_length=default;
|
||
select '1' || '3' from t1;
|
||
'1' || '3'
|
||
1
|
||
1
|
||
1
|
||
1
|
||
set SQL_MODE=oracle;
|
||
select '1' || '3' from t1;
|
||
'1' || '3'
|
||
13
|
||
13
|
||
13
|
||
13
|
||
set SQL_MODE=default;
|
||
drop table t1;
|
||
create table t1 (a varchar(20), b int);
|
||
insert into t1 values ('12345678901234567890', 1);
|
||
set group_concat_max_len=10;
|
||
select group_concat(a) FROM t1 group by b;
|
||
group_concat(a)
|
||
1234567890
|
||
Warnings:
|
||
Warning 1260 1 line(s) were cut by GROUP_CONCAT()
|
||
set group_concat_max_len=1024;
|
||
select group_concat(a) FROM t1 group by b;
|
||
group_concat(a)
|
||
12345678901234567890
|
||
set group_concat_max_len=default;
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
show status like "Qcache_inserts";
|
||
Variable_name Value
|
||
Qcache_inserts 18
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 6
|
||
/**/ select * from t1;
|
||
a
|
||
/**/ select * from t1;
|
||
a
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
show status like "Qcache_inserts";
|
||
Variable_name Value
|
||
Qcache_inserts 19
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 7
|
||
DROP TABLE t1;
|
||
SET GLOBAL query_cache_size=0;
|
||
SET SESSION query_cache_type = 2;
|
||
create table t1(a int);
|
||
select table_name from information_schema.tables
|
||
where table_schema="test";
|
||
table_name
|
||
t1
|
||
drop table t1;
|
||
select table_name from information_schema.tables
|
||
where table_schema="test";
|
||
table_name
|
||
SET SESSION query_cache_type = 1;
|
||
set global query_cache_size=1024*1024;
|
||
flush query cache;
|
||
create table t1 ( a int );
|
||
insert into t1 values (1);
|
||
select a from t1;
|
||
a
|
||
1
|
||
select a from t1;
|
||
a
|
||
1
|
||
show status like 'qcache_queries_in_cache';
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
repair table t1;
|
||
Table Op Msg_type Msg_text
|
||
test.t1 repair status OK
|
||
show status like 'qcache_queries_in_cache';
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
drop table t1;
|
||
set GLOBAL query_cache_size=64*1024;
|
||
create table t1 (a text);
|
||
insert into t1 values (repeat('abcdefghijklmnopqrstuvwxyz', 550));
|
||
create table t2 (a text);
|
||
insert into t2 values (repeat('ijklmnopqrstuvwxyzabcdefgh', 550));
|
||
select a from t1;
|
||
select a from t2;
|
||
show status like 'Qcache_%_blocks';
|
||
Variable_name Value
|
||
Qcache_free_blocks 1
|
||
Qcache_total_blocks 7
|
||
insert into t1 select reverse(a) from t1;
|
||
show status like 'Qcache_%_blocks';
|
||
Variable_name Value
|
||
Qcache_free_blocks 2
|
||
Qcache_total_blocks 5
|
||
select a from t1;
|
||
show status like 'Qcache_%_blocks';
|
||
Variable_name Value
|
||
Qcache_free_blocks 1
|
||
Qcache_total_blocks 8
|
||
select a from t1;
|
||
a
|
||
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zyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvutsrqponmlkjihgfedcbazyxwvuts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|
||
flush query cache;
|
||
drop table t1, t2;
|
||
set GLOBAL query_cache_size=1355776
|
||
#;
|
||
flush status;
|
||
CREATE TABLE t1 (
|
||
`date` datetime NOT NULL default '0000-00-00 00:00:00',
|
||
KEY `date` (`date`)
|
||
) ENGINE=MyISAM;
|
||
INSERT INTO t1 VALUES ('20050326');
|
||
INSERT INTO t1 VALUES ('20050325');
|
||
SELECT COUNT(*) FROM t1 WHERE date BETWEEN '20050326' AND '20050327 invalid';
|
||
COUNT(*)
|
||
0
|
||
Warnings:
|
||
Warning 1292 Incorrect datetime value: '20050327 invalid' for column 'date' at row 1
|
||
Warning 1292 Incorrect datetime value: '20050327 invalid' for column 'date' at row 1
|
||
SELECT COUNT(*) FROM t1 WHERE date BETWEEN '20050326' AND '20050328 invalid';
|
||
COUNT(*)
|
||
0
|
||
Warnings:
|
||
Warning 1292 Incorrect datetime value: '20050328 invalid' for column 'date' at row 1
|
||
Warning 1292 Incorrect datetime value: '20050328 invalid' for column 'date' at row 1
|
||
SELECT COUNT(*) FROM t1 WHERE date BETWEEN '20050326' AND '20050327 invalid';
|
||
COUNT(*)
|
||
0
|
||
Warnings:
|
||
Warning 1292 Incorrect datetime value: '20050327 invalid' for column 'date' at row 1
|
||
Warning 1292 Incorrect datetime value: '20050327 invalid' for column 'date' at row 1
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
show status like "Qcache_inserts";
|
||
Variable_name Value
|
||
Qcache_inserts 0
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 0
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
insert into t1 values (1);
|
||
reset query cache;
|
||
flush status;
|
||
select * from (select * from t1) a;
|
||
a
|
||
1
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
show status like "Qcache_inserts";
|
||
Variable_name Value
|
||
Qcache_inserts 1
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 0
|
||
select * from (select * from t1) a;
|
||
a
|
||
1
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
show status like "Qcache_inserts";
|
||
Variable_name Value
|
||
Qcache_inserts 1
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 1
|
||
insert into t1 values (2);
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 0
|
||
show status like "Qcache_inserts";
|
||
Variable_name Value
|
||
Qcache_inserts 1
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 1
|
||
select * from (select * from t1) a;
|
||
a
|
||
1
|
||
2
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
show status like "Qcache_inserts";
|
||
Variable_name Value
|
||
Qcache_inserts 2
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 1
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
flush status;
|
||
(select a from t1) union (select a from t1);
|
||
a
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
show status like "Qcache_inserts";
|
||
Variable_name Value
|
||
Qcache_inserts 1
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 0
|
||
(select a from t1) union (select a from t1);
|
||
a
|
||
show status like "Qcache_queries_in_cache";
|
||
Variable_name Value
|
||
Qcache_queries_in_cache 1
|
||
show status like "Qcache_inserts";
|
||
Variable_name Value
|
||
Qcache_inserts 1
|
||
show status like "Qcache_hits";
|
||
Variable_name Value
|
||
Qcache_hits 1
|
||
drop table t1;
|
||
create table t1 (a int);
|
||
insert into t1 values (1),(2);
|
||
CREATE PROCEDURE `p1`()
|
||
begin
|
||
Declare c1 cursor for select a from t1;
|
||
open c1;
|
||
select * from t1;
|
||
end//
|
||
call p1()//
|
||
a
|
||
1
|
||
2
|
||
drop procedure p1;
|
||
create function f1() returns int
|
||
begin
|
||
Declare var1 int;
|
||
select max(a) from t1 into var1;
|
||
return var1;
|
||
end//
|
||
create procedure `p1`()
|
||
begin
|
||
select a, f1() from t1;
|
||
end//
|
||
call p1()//
|
||
a f1()
|
||
1 2
|
||
2 2
|
||
drop procedure p1//
|
||
drop function f1//
|
||
drop table t1//
|
||
flush query cache;
|
||
reset query cache;
|
||
flush status;
|
||
create table t1 (s1 int)//
|
||
create procedure f1 () begin
|
||
select sql_cache * from t1;
|
||
select sql_cache * from t1;
|
||
select sql_cache * from t1;
|
||
end;//
|
||
create procedure f2 () begin
|
||
select sql_cache * from t1 where s1=1;
|
||
select sql_cache * from t1;
|
||
end;//
|
||
create procedure f3 () begin
|
||
select sql_cache * from t1;
|
||
select sql_cache * from t1 where s1=1;
|
||
end;//
|
||
create procedure f4 () begin
|
||
select sql_cache * from t1;
|
||
select sql_cache * from t1 where s1=1;
|
||
select sql_cache * from t1;
|
||
select sql_cache * from t1 where s1=1;
|
||
select sql_cache * from t1 where s1=1;
|
||
end;//
|
||
call f1();
|
||
s1
|
||
s1
|
||
s1
|
||
call f1();
|
||
s1
|
||
s1
|
||
s1
|
||
call f1();
|
||
s1
|
||
s1
|
||
s1
|
||
select sql_cache * from t1;
|
||
s1
|
||
insert into t1 values (1);
|
||
select sql_cache * from t1;
|
||
s1
|
||
1
|
||
call f1();
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
call f1();
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
select sql_cache * from t1;
|
||
s1
|
||
1
|
||
flush query cache;
|
||
reset query cache;
|
||
flush status;
|
||
select sql_cache * from t1;
|
||
s1
|
||
1
|
||
select sql_cache * from t1 where s1=1;
|
||
s1
|
||
1
|
||
call f1();
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
call f2();
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
call f3();
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
call f4();
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
call f4();
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
call f3();
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
call f2();
|
||
s1
|
||
1
|
||
s1
|
||
1
|
||
select sql_cache * from t1 where s1=1;
|
||
s1
|
||
1
|
||
insert into t1 values (2);
|
||
call f1();
|
||
s1
|
||
1
|
||
2
|
||
s1
|
||
1
|
||
2
|
||
s1
|
||
1
|
||
2
|
||
select sql_cache * from t1 where s1=1;
|
||
s1
|
||
1
|
||
select sql_cache * from t1;
|
||
s1
|
||
1
|
||
2
|
||
call f1();
|
||
s1
|
||
1
|
||
2
|
||
s1
|
||
1
|
||
2
|
||
s1
|
||
1
|
||
2
|
||
call f3();
|
||
s1
|
||
1
|
||
2
|
||
s1
|
||
1
|
||
call f3();
|
||
s1
|
||
1
|
||
2
|
||
s1
|
||
1
|
||
call f1();
|
||
s1
|
||
1
|
||
2
|
||
s1
|
||
1
|
||
2
|
||
s1
|
||
1
|
||
2
|
||
drop procedure f1;
|
||
drop procedure f2;
|
||
drop procedure f3;
|
||
drop procedure f4;
|
||
drop table t1;
|
||
set GLOBAL query_cache_size=0;
|
||
SET GLOBAL query_cache_size=102400;
|
||
create table t1(a int);
|
||
insert into t1 values(0), (1), (4), (5);
|
||
select * from t1 where a > 3;
|
||
a
|
||
4
|
||
5
|
||
select * from t1 where a > 3;
|
||
a
|
||
4
|
||
5
|
||
show status like 'last_query_cost';
|
||
Variable_name Value
|
||
Last_query_cost 0.000000
|
||
drop table t1;
|
||
SET GLOBAL query_cache_size=0;
|