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Bug#10178 - failure to find a row in heap table by concurrent UPDATEs

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Moved the key statistics update to info().
The table is not locked in open(). This made wrong stats possible.

No test case for the test suite.
This happens only with heavy concurrency.
A test script is added to the bug report.


mysql-test/r/heap_hash.result:
  Bug#10178 - failure to find a row in heap table by concurrent UPDATEs
  Updated test results to reflect the new  statistics behaviour.
mysql-test/t/heap_hash.test:
  Bug#10178 - failure to find a row in heap table by concurrent UPDATEs
  Added a FLUSH TABLES to avoid statistics differences between normal 
  and ps-protocol tests.
sql/ha_heap.cc:
  Bug#10178 - failure to find a row in heap table by concurrent UPDATEs
  Moved the key statistics update to info().
  The table is not locked in open(). This made wrong stats possible.
sql/ha_heap.h:
  Bug#10178 - failure to find a row in heap table by concurrent UPDATEs
  Added an element to track the validity of the key statistics.
This commit is contained in:
unknown
2005-06-24 17:47:09 +02:00
parent 5aa793f72b
commit a7e66efc2c
4 changed files with 43 additions and 17 deletions
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23
mysql-test/r/heap_hash.result
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@ -231,18 +231,19 @@ explain select * from t1 where a='aaad';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 8 const 1 Using where
insert into t1 select * from t1;
flush tables;
explain select * from t1 where a='aaaa';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 8 const 1 Using where
1 SIMPLE t1 ref a a 8 const 2 Using where
explain select * from t1 where a='aaab';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 8 const 1 Using where
1 SIMPLE t1 ref a a 8 const 2 Using where
explain select * from t1 where a='aaac';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 8 const 1 Using where
1 SIMPLE t1 ref a a 8 const 2 Using where
explain select * from t1 where a='aaad';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 8 const 1 Using where
1 SIMPLE t1 ref a a 8 const 2 Using where
flush tables;
explain select * from t1 where a='aaaa';
id select_type table type possible_keys key key_len ref rows Extra
@ -261,16 +262,16 @@ delete from t1;
insert into t1 select * from t2;
explain select * from t1 where a='aaaa';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 8 const 1 Using where
1 SIMPLE t1 ref a a 8 const 2 Using where
explain select * from t1 where a='aaab';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 8 const 1 Using where
1 SIMPLE t1 ref a a 8 const 2 Using where
explain select * from t1 where a='aaac';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 8 const 1 Using where
1 SIMPLE t1 ref a a 8 const 2 Using where
explain select * from t1 where a='aaad';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 8 const 1 Using where
1 SIMPLE t1 ref a a 8 const 2 Using where
drop table t1, t2;
create table t1 (
id int unsigned not null primary key auto_increment,
@ -345,15 +346,15 @@ insert into t3 select name, name from t1;
show index from t3;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t3 1 a 1 a NULL NULL NULL NULL HASH
t3 1 a 2 b NULL 15 NULL NULL HASH
t3 1 a 2 b NULL 13 NULL NULL HASH
show index from t3;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t3 1 a 1 a NULL NULL NULL NULL HASH
t3 1 a 2 b NULL 15 NULL NULL HASH
t3 1 a 2 b NULL 13 NULL NULL HASH
explain select * from t1 ignore key(btree_idx), t3 where t1.name='matt' and t3.a = concat('',t1.name) and t3.b=t1.name;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref heap_idx heap_idx 20 const 7 Using where
1 SIMPLE t3 ref a a 40 func,const 6 Using where
1 SIMPLE t3 ref a a 40 func,const 7 Using where
drop table t1, t2, t3;
create temporary table t1 ( a int, index (a) ) engine=memory;
insert into t1 values (1),(2),(3),(4),(5);