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############## mysql-test\t\myisam_stats_method_func.test ####################
# #
# Variable Name: myisam_stats_method #
# Scope: GLOBAL | SESSION #
# Access Type: Dynamic #
# Data Type: enumeration #
# Default Value: nulls_equal #
# Valid Values: nulls_equal, nulls_unequal #
# #
# #
# Creation Date: 2008-03-08 #
# Author: Rizwan #
# #
# Description: Test Cases of Dynamic System Variable myisam_stats_method #
# that checks the behavior of this variable #
# #
# Reference: http://dev.mysql.com/doc/refman/5.1/en/ #
# server-system-variables.html #
# #
###############################################################################
--echo '#--------------------FN_DYNVARS_097_01-------------------------#'
#####################################################################
# Check if Setting myisam_stats_method is changed in new connection #
#####################################################################
SET @@global.myisam_stats_method = nulls_equal;
--echo 'connect (con1,localhost,root,,,,)'
connect (con1,localhost,root,,,,);
--echo 'connection con1'
connection con1;
SELECT @@global.myisam_stats_method;
SELECT @@session.myisam_stats_method;
disconnect con1;
--echo '#--------------------FN_DYNVARS_097_02-------------------------#'
###########################################################
# Begin the functionality Testing of myisam_stats_method #
###########################################################
--echo 'connection default'
connection default;
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
CREATE TABLE t1 (a int, key (a));
INSERT INTO t1 VALUES (0),(1),(2),(3),(4);
INSERT INTO t1 SELECT NULL FROM t1;
#=======================================
--echo 'default: NULLs considered unequal'
#=======================================
SET myisam_stats_method=nulls_unequal;
ANALYZE TABLE t1;
SHOW INDEX FROM t1;
INSERT INTO t1 VALUES (11);
DELETE FROM t1 WHERE a=11;
CHECK TABLE t1;
SHOW INDEX FROM t1;
#=====================================
--echo 'Set nulls to be equal'
#=====================================
SET myisam_stats_method=nulls_equal;
INSERT INTO t1 VALUES (11);
DELETE FROM t1 WHERE a=11;
ANALYZE TABLE t1;
SHOW INDEX FROM t1;
INSERT INTO t1 VALUES (11);
DELETE FROM t1 WHERE a=11;
CHECK TABLE t1;
SHOW INDEX FROM t1;
#=====================================
--echo 'Set nulls to be ignored'
#=====================================
SET myisam_stats_method=nulls_ignored;
SHOW variables LIKE 'myisam_stats_method';
drop TABLE t1;
CREATE TABLE t1 (
a char(3), b char(4), c char(5), d char(6),
key(a,b,c,d)
);
INSERT INTO t1 VALUES ('bcd','def1', NULL, 'zz');
INSERT INTO t1 VALUES ('bcd','def2', NULL, 'zz');
INSERT INTO t1 VALUES ('bce','def1', 'yuu', NULL);
INSERT INTO t1 VALUES ('bce','def2', NULL, 'quux');
ANALYZE TABLE t1;
SHOW INDEX FROM t1;
DELETE FROM t1;
ANALYZE TABLE t1;
SHOW INDEX FROM t1;
SET myisam_stats_method=DEFAULT;
DROP TABLE t1;
########################################################
# End of functionality Testing for myisam_stats_method #
########################################################
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