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Directory : /www/server/mysql/mysql-test/suite/sys_vars/t/

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Current File : /www/server/mysql/mysql-test/suite/sys_vars/t/max_seeks_for_key_func.test

# Test for max_seeks_for_key #

--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings


#########################
#   Creating new table  #
#########################

CREATE TABLE t1
(a INT AUTO_INCREMENT PRIMARY KEY,
b CHAR(20)
);

SET @start_value= @@global.max_seeks_for_key;

--echo '#--------------------FN_DYNVARS_084_01-------------------------#'
##########################################################
#    Test behavior of variable on new connection # 01    #
##########################################################

CONNECT (test_con1,localhost,root,,);
CONNECTION test_con1;

# Value of session & global vairable here should be 10
SELECT @@global.max_seeks_for_key = 10;
SELECT @@session.max_seeks_for_key = 10;

# Setting global value of variable and inserting data in table
SET @@global.max_seeks_for_key = 20;
SELECT @@global.max_seeks_for_key;
INSERT INTO t1(b) VALUES("AREc");
EXPLAIN SELECT STRAIGHT_JOIN * FROM t1,t1 AS t2 WHERE t1.b = t2.b;

# Setting session value of variable and inserting data in table
SET @@session.max_seeks_for_key = 2;
SELECT @@session.max_seeks_for_key;
INSERT INTO t1(b) VALUES("BREc");
INSERT INTO t1(b) VALUES("CRec");
EXPLAIN SELECT STRAIGHT_JOIN * FROM t1,t1 AS t2 WHERE t1.b = t2.b;


--echo '#--------------------FN_DYNVARS_084_02-------------------------#'
##########################################################
#    Test behavior of variable on new connection # 02    #
##########################################################


CONNECT (test_con2,localhost,root,,);
connection test_con2;


# Value of session & global vairable here should be 10
SELECT @@global.max_seeks_for_key = 10;
SELECT @@session.max_seeks_for_key = 10;

# Setting global value of variable and inserting data in table
SET @@global.max_seeks_for_key = 20;
SELECT @@global.max_seeks_for_key;
INSERT INTO t1(b) VALUES("AREc");
EXPLAIN SELECT STRAIGHT_JOIN * FROM t1,t1 AS t2 WHERE t1.b = t2.b;

# Setting session value of variable and inserting data in table
SET @@session.max_seeks_for_key = 2;
SELECT @@session.max_seeks_for_key;
INSERT INTO t1(b) VALUES("BREc");
INSERT INTO t1(b) VALUES("CRec");
EXPLAIN SELECT STRAIGHT_JOIN * FROM t1,t1 AS t2 WHERE t1.b = t2.b;

######################################################
#   Inserting values in  table t and analyzing table #
######################################################

INSERT INTO t1 VALUES(null,"test");
INSERT INTO t1 VALUES (null,"a"),(null,"a"),(null,"a"),
                     (null,"a"),(null,"a"),(null,"a"),(null,"a"),
                     (null,"a"),(null,"a"),(null,"a");
EXPLAIN SELECT STRAIGHT_JOIN * FROM t1,t1 AS t2 WHERE t1.b = t2.b;
ANALYZE TABLE t1;

###################################################################
#   Setting new value for max_seeks_for_key and anaylyzing table  #
###################################################################

SET MAX_SEEKS_FOR_KEY=1;


EXPLAIN SELECT STRAIGHT_JOIN * FROM t1,t1 AS t2 WHERE t1.b = t2.b;
SET MAX_SEEKS_FOR_KEY=DEFAULT;

connection default;
disconnect test_con1;
disconnect test_con2;

DROP TABLE t1;

SET @@global.max_seeks_for_key= @start_value;

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