Hi Roberto, it is described here: http://dev.mysql.com/doc/refman/5.6/en/server-default-changes.html Regards, Sergey On Thu, Sep 19, 2013 at 04:23:10PM -0300, Roberto Spadim wrote:

Hi guys, what's the "MySQL variables auto-tuning code" means? i didn't saw that in mysql source and at mysql docs, any idea what this means?

2013/9/18 Sergey Vojtovich

...

At lp:maria/10.0

------------------------------------------------------------ revno: 3816 revision-id: svoj@mariadb.org-20130918071716-yu2a5489uldzfuy9 parent: sanja@askmonty.org-20130917190515-g3xncb1slqwy4cix committer: Sergey Vojtovich branch nick: 10.0-mdev4883 timestamp: Wed 2013-09-18 11:17:16 +0400 message: MDEV-4883 - Not all host_cache tests have been merged

Merged main.host_cache_size_functionality test.

Test had to be adjusted because MariaDB doesn't have MySQL variables auto-tuning code. === added file 'mysql-test/r/host_cache_size_functionality.result' --- a/mysql-test/r/host_cache_size_functionality.result 1970-01-01 00:00:00 +0000 +++ b/mysql-test/r/host_cache_size_functionality.result 2013-09-18 07:17:16 +0000 @@ -0,0 +1,78 @@ +'#________________________VAR_06_Host_Cache_Size__________________#' +echo '##' +--echo '#---------------------WL6372_VAR_6_01----------------------#' +#################################################################### +# Checking default value # +#################################################################### +SELECT COUNT(@@GLOBAL.Host_Cache_Size) +1 Expected +set @Default_host_cache_size=128; +select @@global.Host_Cache_Size=@Default_host_cache_size; +@@global.Host_Cache_Size=@Default_host_cache_size +1 +1 Expected +'#---------------------WL6372_VAR_6_02----------------------#' +# Restart server with Host_Cache_Size 1 +SELECT @@GLOBAL.Host_Cache_Size; +@@GLOBAL.Host_Cache_Size +1 +1 Expected +set @Default_host_cache_size=128; +SET @@GLOBAL.Host_Cache_Size=DEFAULT; +select @@global.Host_Cache_Size=@Default_host_cache_size; +@@global.Host_Cache_Size=@Default_host_cache_size +1 +1 Expected +'#---------------------WL6372_VAR_6_03----------------------#' +SET @@local.Host_Cache_Size=1; +ERROR HY000: Variable 'host_cache_size' is a GLOBAL variable and should be set with SET GLOBAL +Expected error 'Global variable' +SET @@session.Host_Cache_Size=1; +ERROR HY000: Variable 'host_cache_size' is a GLOBAL variable and should be set with SET GLOBAL +Expected error 'Global variable' +SET @@GLOBAL.Host_Cache_Size=1; +SET @@GLOBAL.Host_Cache_Size=DEFAULT; +SELECT COUNT(@@GLOBAL.Host_Cache_Size); +COUNT(@@GLOBAL.Host_Cache_Size) +1 +1 Expected +select @@global.Host_Cache_Size=@Default_host_cache_size; +@@global.Host_Cache_Size=@Default_host_cache_size +1 +1 Expected +'#---------------------WL6372_VAR_6_04----------------------#' +SELECT @@GLOBAL.Host_Cache_Size = VARIABLE_VALUE +FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES +WHERE VARIABLE_NAME='Host_Cache_Size'; +@@GLOBAL.Host_Cache_Size = VARIABLE_VALUE +1 +1 Expected +SELECT COUNT(@@GLOBAL.Host_Cache_Size); +COUNT(@@GLOBAL.Host_Cache_Size) +1 +1 Expected +SELECT COUNT(VARIABLE_VALUE) +FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES +WHERE VARIABLE_NAME='Host_Cache_Size'; +COUNT(VARIABLE_VALUE) +1 +1 Expected +'#---------------------WL6372_VAR_6_05----------------------#' +SELECT @@Host_Cache_Size = @@GLOBAL.Host_Cache_Size; +@@Host_Cache_Size = @@GLOBAL.Host_Cache_Size +1 +1 Expected +SELECT COUNT(@@local.Host_Cache_Size); +ERROR HY000: Variable 'host_cache_size' is a GLOBAL variable +Expected error 'Variable is a GLOBAL variable' +SELECT COUNT(@@SESSION.Host_Cache_Size); +ERROR HY000: Variable 'host_cache_size' is a GLOBAL variable +Expected error 'Variable is a GLOBAL variable' +SELECT COUNT(@@GLOBAL.Host_Cache_Size); +COUNT(@@GLOBAL.Host_Cache_Size) +1 +1 Expected +SELECT Host_Cache_Size = @@SESSION.Host_Cache_Size; +ERROR 42S22: Unknown column 'Host_Cache_Size' in 'field list' +Expected error 'Unknown column Host_Cache_Size in field list' +SET @@GLOBAL.Host_Cache_Size=DEFAULT;

=== added file 'mysql-test/t/host_cache_size_functionality.test' --- a/mysql-test/t/host_cache_size_functionality.test 1970-01-01 00:00:00 +0000 +++ b/mysql-test/t/host_cache_size_functionality.test 2013-09-18 07:17:16 +0000 @@ -0,0 +1,185 @@

+############################################################################### +# # +# Variable Name: Host_Cache_Size # +# Scope: Global # +# Access Type: Dynamic # +# Data Type: numeric # +# # +# # +# Creation Date: 2012-08-31 # +# Author : Tanjot Singh Uppal # +# # +# # +# Description:Test Cases of Dynamic System Variable Host_Cache_Size # +# that checks the behavior of this variable in the following ways # +# * Value Check # +# * Scope Check # +# * Functionality Check # +# * Accessability Check # +# # +# This test does not perform the crash recovery on this variable # +# For crash recovery test on default change please run the ibtest #

+############################################################################### + +-- source include/have_innodb.inc +-- source include/not_embedded.inc +-- source include/have_innodb_16k.inc +--disable_warnings +echo '#________________________VAR_06_Host_Cache_Size__________________#' +echo '##' +--echo '#---------------------WL6372_VAR_6_01----------------------#' +#################################################################### +# Checking default value # +#################################################################### +SELECT COUNT(@@GLOBAL.Host_Cache_Size); +--echo 1 Expected + +#set @Default_host_cache_size=(select if(if(@@global.max_connections<500,128+@@global.max_connections,128+@ @global.max_connections+floor((@@global.max_connections-500)/20))>2000,2000,if(@@global.max_connections<500,128+@ @global.max_connections,128+@ @global.max_connections+floor((@@global.max_connections-500)/20)))); +set @Default_host_cache_size=128; + +select @@global.Host_Cache_Size=@Default_host_cache_size; +--echo 1 Expected + + +--echo '#---------------------WL6372_VAR_6_02----------------------#'

+################################################################################# +# Checking the Default value post starting the server with other value #

+################################################################################# +--echo # Restart server with Host_Cache_Size 1 + +let $restart_file= $MYSQLTEST_VARDIR/tmp/mysqld.1.expect; +--exec echo "wait" > $restart_file +--shutdown_server 10 +--source include/wait_until_disconnected.inc +-- exec echo "restart:--host_cache_size=1 " > $MYSQLTEST_VARDIR/tmp/mysqld.1.expect +-- enable_reconnect +-- source include/wait_until_connected_again.inc + +--disable_warnings + +SELECT @@GLOBAL.Host_Cache_Size; +--echo 1 Expected + +#set @Default_host_cache_size=(select if(if(@@global.max_connections<500,128+@@global.max_connections,128+@ @global.max_connections+floor((@@global.max_connections-500)/20))>2000,2000,if(@@global.max_connections<500,128+@ @global.max_connections,128+@ @global.max_connections+floor((@@global.max_connections-500)/20)))); +set @Default_host_cache_size=128; +SET @@GLOBAL.Host_Cache_Size=DEFAULT; +select @@global.Host_Cache_Size=@Default_host_cache_size; +--echo 1 Expected + + +--echo '#---------------------WL6372_VAR_6_03----------------------#' +#################################################################### +# Checking Value can be set - Dynamic # +#################################################################### +--error ER_GLOBAL_VARIABLE +SET @@local.Host_Cache_Size=1; +--echo Expected error 'Global variable' + +--error ER_GLOBAL_VARIABLE +SET @@session.Host_Cache_Size=1; +--echo Expected error 'Global variable' + +SET @@GLOBAL.Host_Cache_Size=1; +SET @@GLOBAL.Host_Cache_Size=DEFAULT; + +SELECT COUNT(@@GLOBAL.Host_Cache_Size); +--echo 1 Expected + +select @@global.Host_Cache_Size=@Default_host_cache_size; +--echo 1 Expected + +--echo '#---------------------WL6372_VAR_6_04----------------------#' +################################################################# +# Check if the value in GLOBAL Table matches value in variable # +################################################################# +SELECT @@GLOBAL.Host_Cache_Size = VARIABLE_VALUE +FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES +WHERE VARIABLE_NAME='Host_Cache_Size'; +--echo 1 Expected + +SELECT COUNT(@@GLOBAL.Host_Cache_Size); +--echo 1 Expected + +SELECT COUNT(VARIABLE_VALUE) +FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES +WHERE VARIABLE_NAME='Host_Cache_Size'; +--echo 1 Expected + +--echo '#---------------------WL6372_VAR_6_05----------------------#'

+################################################################################ +# Checking Variable Scope #

+################################################################################ +SELECT @@Host_Cache_Size = @@GLOBAL.Host_Cache_Size; +--echo 1 Expected + +--Error ER_INCORRECT_GLOBAL_LOCAL_VAR +SELECT COUNT(@@local.Host_Cache_Size); +--echo Expected error 'Variable is a GLOBAL variable' + +--Error ER_INCORRECT_GLOBAL_LOCAL_VAR +SELECT COUNT(@@SESSION.Host_Cache_Size); +--echo Expected error 'Variable is a GLOBAL variable' + +SELECT COUNT(@@GLOBAL.Host_Cache_Size); +--echo 1 Expected + +--Error ER_BAD_FIELD_ERROR +SELECT Host_Cache_Size = @@SESSION.Host_Cache_Size; +--echo Expected error 'Unknown column Host_Cache_Size in field list' + +#The below check has been commented out as the IP fetch is different in a P2P connection than BroadBand connection +#--echo '#---------------------WL6372_VAR_6_06----------------------#'

+############################################################################### +# Checking the Host cahce functionality #

+############################################################################### + +#SET @@GLOBAL.Host_Cache_Size=2; +#--disable_warnings + +#--perl +#my $ip=`ifconfig | egrep "inet addr|inet" | sed -e 's/^.*inet addr://' -e 's/^.*inet//'| sed 's/ .*\$//'|egrep -i "broadcast|bcast"|head -1|awk '{print $1}'`; +#open (LOGFH, ">" . $ENV{'MYSQL_TMP_DIR'} . "/bind_ip"); +#print LOGFH "let \$bind_ip = $ip;\n"; +#close LOGFH; +#EOF + +#--source $MYSQL_TMP_DIR/bind_ip +#--remove_file $MYSQL_TMP_DIR/bind_ip + +#let $restart_file= $MYSQLTEST_VARDIR/tmp/mysqld.1.expect; +#--exec echo "wait" > $restart_file +#--shutdown_server 10 +#--source include/wait_until_disconnected.inc +#-- exec echo "restart:--bind-address=$bind_ip " > $MYSQLTEST_VARDIR/tmp/mysqld.1.expect +#-- enable_reconnect +#-- source include/wait_until_connected_again.inc + +#connection default; +#--disable_warnings + +#create user binduser; +#grant all on *.* to binduser; + +#select count(IP) from performance_schema.host_cache; +#--echo 0 Expected + +#connect (con1,$bind_ip,binduser,,); +#select count(IP) from performance_schema.host_cache; +#--echo 1 Expected + +#disconnect con1; +#connection default; + +#--disable_warnings + +# The below check is hashed until the BUG14689561# is fixed +# +#flush hosts; + +#connect (con2,$bind_ip,binduser,,); +#select count(IP) from performance_schema.host_cache; +#--echo 1 Expected + +#disconnect con2; + +SET @@GLOBAL.Host_Cache_Size=DEFAULT;

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-- Roberto Spadim SPAEmpresarial

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