############# mysql-test\t\thread_cache_size_func.test #######################################
#                                                                                       #
# Variable Name: thread_cache_size                                                      #
# Scope: SESSION                                                                        #
# Access Type: Dynamic                                                                  #
# Data Type: Enumeration                                                                #
# Default Value: 0                                                                      #
# Values:      0-16384                                                                  #
#                                                                                       #
#                                                                                       #
# Creation Date: 2008-03-02                                                             #
# Author:  Sharique Abdullah                                                                #
#                                                                                       #
# Description: Test Cases of Dynamic System Variable "thread_cache_size"                #
#              that checks behavior of this variable in the following ways              #
#              * Functionality based on different values                                #
#                                                                                       #
# Reference: http://dev.mysql.com/doc/refman/5.1/en/server-system-variables.html        #
# option_mysqld_thread_cache_size                                                       #
#                                                                                       #
#########################################################################################



#
# Setup
#

--source include/not_embedded.inc

SET @global_thread_cache_size = @@GLOBAL.thread_cache_size;

FLUSH STATUS;

#
# Greater than cache threads, setting cache size to 3
#
-- ECHO '# Test1#'
SET @@GLOBAL.thread_cache_size=3;

let $threadsCreated1 = query_get_value(SHOW STATUS LIKE 'Threads_created', Value, 1);
--echo Saving threads cached, threads created values

SHOW STATUS LIKE 'Threads_cached';
--echo 0 Expected

--ECHO '#Old value for thread_cache'#

##################################
# Make 4 connections             #
##################################

--echo ** Connecting conn1 using username 'root' **
connect (conn1,localhost,root,,);
--echo ** Connecting conn2 using username 'root' **
connect (conn2,localhost,root,,);
--echo ** Connecting conn3 using username 'root' **
connect (conn3,localhost,root,,);
--echo ** Connecting conn4 using username 'root' **
connect (conn4,localhost,root,,);

let $threadsCreated2 = query_get_value(SHOW STATUS LIKE 'Threads_created', Value, 1);
--echo Saving threads cached, threads created values

--disable_query_log
eval SELECT ($threadsCreated2 - $threadsCreated1) AS 'Threads Created Difference';
--enable_query_log

--echo 4 Expected
SHOW STATUS LIKE 'Threads_cached';
--echo 0 Expected

####################################
#Disconnecting all the connections #
####################################

--echo ** Connection default **
connection default;

--echo ** Disconnecting conn1,conn2,conn3,conn4 **
disconnect conn1;
disconnect conn2;
disconnect conn3;
disconnect conn4;

#
# Checking the status
#

--echo '#new  values for thread cache after disconnecting'#
let $threadsCreated3 = query_get_value(SHOW STATUS LIKE 'Threads_created', Value, 1);

--echo Saving threads cached, threads created values
--disable_query_log
eval SELECT ($threadsCreated3 - $threadsCreated2) AS 'Threads Created Difference';
--enable_query_log
--echo 0 Expected
SHOW STATUS LIKE 'Threads_cached';
--echo 3 Expected


#
# Decreasing cache size to 1
#
SET @@GLOBAL.thread_cache_size=1;

connection default;

let $threadsCreated6 = query_get_value(SHOW STATUS LIKE 'Threads_created', Value, 1);
--echo Saving threads cached, threads created values
--disable_query_log
eval SELECT $threadsCreated6 - $threadsCreated3 AS 'Threads Created Difference';
--enable_query_log
--echo 0 Expected
SHOW STATUS LIKE 'Threads_cached';
--echo 1 Expected
--echo Bug: The number of threads cached should have decreased with cache size decrease.

--echo ** Connecting conn1 using username 'root' **
CONNECT (conn1,localhost,root,,);
--echo ** Connecting conn2 using username 'root' **
CONNECT (conn2,localhost,root,,);

let $threadsCreated4 = query_get_value(SHOW STATUS LIKE 'Threads_created', Value, 1);
--echo Saving threads cached, threads created values
--disable_query_log
eval SELECT $threadsCreated4 - $threadsCreated3 AS 'Threads Created Difference';
--enable_query_log
--echo 1 Expected
--echo Bug: The number of threads created should have increased because the cache should have 1 thread only
SHOW STATUS LIKE 'Threads_cached';
--echo 0 Expected
--echo Bug: The number of threads created should have decreased because atleast 1 new connection came in

--echo ** Connection default **
connection default;

--echo ** Disconnecting conn1,conn2 **
disconnect conn1;
disconnect conn2;

--ECHO '#new status values for thread cache'#
let $threadsCreated5 = query_get_value(SHOW STATUS LIKE 'Threads_created', Value, 1);
--echo Saving threads cached, threads created values
--disable_query_log
eval SELECT ($threadsCreated5 - $threadsCreated4) AS 'Threads Created Difference';
--enable_query_log
--echo 0 Expected
SHOW STATUS LIKE 'Threads_cached';
--echo 1 Expected

--echo Saving threads cached, threads created values

#
# Cleanup
#

SET @@GLOBAL.thread_cache_size = @global_thread_cache_size;