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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 @start_value = @@global.myisam_stats_method;
SET @@global.myisam_stats_method = nulls_equal;
connect (con1,localhost,root,,,,);
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 #
###########################################################
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;
set @save_use_stat_tables= @@use_stat_tables;
set @@use_stat_tables= COMPLEMENTARY;
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;
set @@use_stat_tables= @save_use_stat_tables;
DROP TABLE t1;
SET @@global.myisam_stats_method= @start_value;
########################################################
# End of functionality Testing for myisam_stats_method #
########################################################
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