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25 lines
969 B
Plaintext
25 lines
969 B
Plaintext
flush status;
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set query_cache_type=DEMAND;
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set global query_cache_size= 1024*1024*512;
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drop table if exists t1;
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create table t1 (a varchar(100));
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insert into t1 values ('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'),('bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');
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Activate debug hook and attempt to retrieve the statement from the cache.
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set session debug='+d,wait_in_query_cache_insert';
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select SQL_CACHE * from t1;;
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On a second connection; clear the 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 1
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set global query_cache_size= 0;
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Signal the debug hook to release the lock.
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select id from information_schema.processlist where state='wait_in_query_cache_insert' into @thread_id;
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kill query @thread_id;
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Show query cache status.
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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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set global query_cache_size= 0;
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use test;
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drop table t1;
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