mirror of
https://github.com/MariaDB/server.git
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86 lines
3.0 KiB
Plaintext
86 lines
3.0 KiB
Plaintext
'#--------------------FN_DYNVARS_097_01-------------------------#'
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SET @@global.myisam_stats_method = nulls_equal;
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'connect (con1,localhost,root,,,,)'
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'connection con1'
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SELECT @@global.myisam_stats_method;
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@@global.myisam_stats_method
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nulls_equal
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SELECT @@session.myisam_stats_method;
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@@session.myisam_stats_method
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nulls_equal
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'#--------------------FN_DYNVARS_097_02-------------------------#'
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'connection default'
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a int, key (a));
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INSERT INTO t1 VALUES (0),(1),(2),(3),(4);
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INSERT INTO t1 SELECT NULL FROM t1;
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'default: NULLs considered unequal'
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SET myisam_stats_method=nulls_unequal;
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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 1 a 1 a A 10 NULL NULL YES BTREE
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INSERT INTO t1 VALUES (11);
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DELETE FROM t1 WHERE a=11;
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 1 a 1 a A 10 NULL NULL YES BTREE
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'Set nulls to be equal'
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SET myisam_stats_method=nulls_equal;
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INSERT INTO t1 VALUES (11);
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DELETE FROM t1 WHERE a=11;
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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 1 a 1 a A 5 NULL NULL YES BTREE
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INSERT INTO t1 VALUES (11);
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DELETE FROM t1 WHERE a=11;
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CHECK TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 1 a 1 a A 5 NULL NULL YES BTREE
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'Set nulls to be ignored'
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SET myisam_stats_method=nulls_ignored;
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SHOW variables LIKE 'myisam_stats_method';
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Variable_name Value
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myisam_stats_method nulls_ignored
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drop TABLE t1;
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CREATE TABLE t1 (
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a char(3), b char(4), c char(5), d char(6),
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key(a,b,c,d)
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);
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INSERT INTO t1 VALUES ('bcd','def1', NULL, 'zz');
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INSERT INTO t1 VALUES ('bcd','def2', NULL, 'zz');
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INSERT INTO t1 VALUES ('bce','def1', 'yuu', NULL);
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INSERT INTO t1 VALUES ('bce','def2', NULL, 'quux');
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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 1 a 1 a A 2 NULL NULL YES BTREE
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t1 1 a 2 b A 4 NULL NULL YES BTREE
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t1 1 a 3 c A 4 NULL NULL YES BTREE
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t1 1 a 4 d A 4 NULL NULL YES BTREE
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DELETE FROM t1;
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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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SHOW INDEX FROM t1;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
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t1 1 a 1 a A 0 NULL NULL YES BTREE
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t1 1 a 2 b A 0 NULL NULL YES BTREE
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t1 1 a 3 c A 0 NULL NULL YES BTREE
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t1 1 a 4 d A 0 NULL NULL YES BTREE
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SET myisam_stats_method=DEFAULT;
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DROP TABLE t1;
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