database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +03:00
Code Activity

Don't count NULL values in cardinalty for MyISAM tables.

Browse Source 
Free row buffer cache after each query for MyISAM tables.
Added table join option FORCE INDEX
Fixed core dump bug when connecting with hostname that could not be resolved.
This commit is contained in:
monty@mashka.mysql.fi
2003-01-09 02:19:14 +02:00
parent 23c13c4539
commit 3c08da957e
17 changed files with 207 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
mysql-test/r/myisam.result
View File

@ -1,4 +1,4 @@
drop table if exists t1;
drop table if exists t1,t2;
CREATE TABLE t1 (
STRING_DATA char(255) default NULL,
KEY STRING_DATA (STRING_DATA)
@ -318,3 +318,45 @@ CREATE TABLE t1 (a varchar(255), b varchar(255), c varchar(255));
ALTER TABLE t1 ADD INDEX t1 (a, b, c);
Specified key was too long. Max key length is 500
DROP TABLE t1;
CREATE TABLE t1 (a int not null, b int, c int, key(b), key(c), key(a,b), key(c,a));
INSERT into t1 values (0, null, 0), (0, null, 1), (0, null, 2), (0, null,3), (1,1,4);
create table t2 (a int not null, b int, c int, key(b), key(c), key(a));
INSERT into t2 values (1,1,1), (2,2,2);
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 b 1 b A 5 NULL NULL YES BTREE
t1 1 c 1 c A 5 NULL NULL YES BTREE
t1 1 a 1 a A 1 NULL NULL BTREE
t1 1 a 2 b A 5 NULL NULL YES BTREE
t1 1 c_2 1 c A 5 NULL NULL YES BTREE
t1 1 c_2 2 a A 5 NULL NULL BTREE
explain select * from t1,t2 where t1.a=t2.a;
table type possible_keys key key_len ref rows Extra
t1 ALL a NULL NULL NULL 5
t2 ALL a NULL NULL NULL 2 Using where
explain select * from t1,t2 force index(a) where t1.a=t2.a;
table type possible_keys key key_len ref rows Extra
t2 ALL a NULL NULL NULL 2
t1 ALL a NULL NULL NULL 5 Using where
explain select * from t1 force index(a),t2 force index(a) where t1.a=t2.a;
table type possible_keys key key_len ref rows Extra
t2 ALL a NULL NULL NULL 2
t1 ref a a 4 t2.a 3
explain select * from t1,t2 where t1.b=t2.b;
table type possible_keys key key_len ref rows Extra
t2 ALL b NULL NULL NULL 2
t1 ref b b 5 t2.b 1 Using where
explain select * from t1,t2 force index(c) where t1.a=t2.a;
table type possible_keys key key_len ref rows Extra
t1 ALL a NULL NULL NULL 5
t2 ALL NULL NULL NULL NULL 2 Using where
explain select * from t1 where a=0 or a=2;
table type possible_keys key key_len ref rows Extra
t1 ALL a NULL NULL NULL 5 Using where
explain select * from t1 force index (a) where a=0 or a=2;
table type possible_keys key key_len ref rows Extra
t1 range a a 4 NULL 4 Using where
drop table t1,t2;