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tuning-primer.sh
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tuning-primer.sh
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#!/bin/sh
# vim: ts=8
#########################################################################
# #
# MySQL performance tuning primer script #
# Writen by: Matthew Montgomery #
# Report bugs to: https://bugs.launchpad.net/mysql-tuning-primer #
# Inspired by: MySQLARd (http://gert.sos.be/demo/mysqlar/) #
# Version: 1.6-r1 Released: 2011-08-06 #
# Licenced under GPLv2 #
# #
#########################################################################
#########################################################################
# #
# Usage: ./tuning-primer.sh [ mode ] #
# #
# Available Modes: #
# all : perform all checks (default) #
# prompt : prompt for login credintials and socket #
# and execution mode #
# mem, memory : run checks for tunable options which #
# effect memory usage #
# disk, file : run checks for options which effect #
# i/o performance or file handle limits #
# innodb : run InnoDB checks /* to be improved */ #
# misc : run checks for that don't categorise #
# well Slow Queries, Binary logs, #
# Used Connections and Worker Threads #
#########################################################################
# #
# Set this socket variable ONLY if you have multiple instances running #
# or we are unable to find your socket, and you don't want to to be #
# prompted for input each time you run this script. #
# #
#########################################################################
socket=
export black='\033[0m'
export boldblack='\033[1;0m'
export red='\033[31m'
export boldred='\033[1;31m'
export green='\033[32m'
export boldgreen='\033[1;32m'
export yellow='\033[33m'
export boldyellow='\033[1;33m'
export blue='\033[34m'
export boldblue='\033[1;34m'
export magenta='\033[35m'
export boldmagenta='\033[1;35m'
export cyan='\033[36m'
export boldcyan='\033[1;36m'
export white='\033[37m'
export boldwhite='\033[1;37m'
cecho ()
## -- Function to easliy print colored text -- ##
# Color-echo.
# Argument $1 = message
# Argument $2 = color
{
local default_msg="No message passed."
message=${1:-$default_msg} # Defaults to default message.
#change it for fun
#We use pure names
color=${2:-black} # Defaults to black, if not specified.
case $color in
black)
printf "$black" ;;
boldblack)
printf "$boldblack" ;;
red)
printf "$red" ;;
boldred)
printf "$boldred" ;;
green)
printf "$green" ;;
boldgreen)
printf "$boldgreen" ;;
yellow)
printf "$yellow" ;;
boldyellow)
printf "$boldyellow" ;;
blue)
printf "$blue" ;;
boldblue)
printf "$boldblue" ;;
magenta)
printf "$magenta" ;;
boldmagenta)
printf "$boldmagenta" ;;
cyan)
printf "$cyan" ;;
boldcyan)
printf "$boldcyan" ;;
white)
printf "$white" ;;
boldwhite)
printf "$boldwhite" ;;
esac
printf "%s\n" "$message"
tput sgr0 # Reset to normal.
printf "$black"
return
}
cechon ()
## -- Function to easliy print colored text -- ##
# Color-echo.
# Argument $1 = message
# Argument $2 = color
{
local default_msg="No message passed."
# Doesn't really need to be a local variable.
message=${1:-$default_msg} # Defaults to default message.
#change it for fun
#We use pure names
color=${2:-black} # Defaults to black, if not specified.
case $color in
black)
printf "$black" ;;
boldblack)
printf "$boldblack" ;;
red)
printf "$red" ;;
boldred)
printf "$boldred" ;;
green)
printf "$green" ;;
boldgreen)
printf "$boldgreen" ;;
yellow)
printf "$yellow" ;;
boldyellow)
printf "$boldyellow" ;;
blue)
printf "$blue" ;;
boldblue)
printf "$boldblue" ;;
magenta)
printf "$magenta" ;;
boldmagenta)
printf "$boldmagenta" ;;
cyan)
printf "$cyan" ;;
boldcyan)
printf "$boldcyan" ;;
white)
printf "$white" ;;
boldwhite)
printf "$boldwhite" ;;
esac
printf "%s" "$message"
tput sgr0 # Reset to normal.
printf "$black"
return
}
print_banner () {
## -- Banner -- ##
cecho " -- MYSQL PERFORMANCE TUNING PRIMER --" boldblue
cecho " - By: Matthew Montgomery -" black
}
## -- Find the location of the mysql.sock file -- ##
check_for_socket () {
if [ -z "$socket" ] ; then
# Use ~/my.cnf version
if [ -f ~/.my.cnf ] ; then
cnf_socket=$(grep ^socket ~/.my.cnf | awk -F \= '{ print $2 }' | head -1)
fi
if [ -S "$cnf_socket" ] ; then
socket=$cnf_socket
elif [ -S /var/lib/mysql/mysql.sock ] ; then
socket=/var/lib/mysql/mysql.sock
elif [ -S /var/run/mysqld/mysqld.sock ] ; then
socket=/var/run/mysqld/mysqld.sock
elif [ -S /tmp/mysql.sock ] ; then
socket=/tmp/mysql.sock
else
if [ -S "$ps_socket" ] ; then
socket=$ps_socket
fi
fi
fi
if [ -S "$socket" ] ; then
echo UP > /dev/null
else
cecho "No valid socket file \"$socket\" found!" boldred
cecho "The mysqld process is not running or it is installed in a custom location." red
cecho "If you are sure mysqld is running, execute script in \"prompt\" mode or set " red
cecho "the socket= variable at the top of this script" red
exit 1
fi
}
check_for_plesk_passwords () {
## -- Check for the existance of plesk and login using it's credentials -- ##
if [ -f /etc/psa/.psa.shadow ] ; then
mysql="mysql -S $socket -u admin -p$(cat /etc/psa/.psa.shadow)"
mysqladmin="mysqladmin -S $socket -u admin -p$(cat /etc/psa/.psa.shadow)"
else
mysql="mysql"
mysqladmin="mysqladmin"
# mysql="mysql -S $socket"
# mysqladmin="mysqladmin -S $socket"
fi
}
check_mysql_login () {
## -- Test for running mysql -- ##
is_up=$($mysqladmin ping 2>&1)
if [ "$is_up" = "mysqld is alive" ] ; then
echo UP > /dev/null
# echo $is_up
elif [ "$is_up" != "mysqld is alive" ] ; then
printf "\n"
cecho "Using login values from ~/.my.cnf"
cecho "- INITIAL LOGIN ATTEMPT FAILED -" boldred
if [ -z $prompted ] ; then
find_webmin_passwords
else
return 1
fi
else
cecho "Unknow exit status" red
exit -1
fi
}
final_login_attempt () {
is_up=$($mysqladmin ping 2>&1)
if [ "$is_up" = "mysqld is alive" ] ; then
echo UP > /dev/null
elif [ "$is_up" != "mysqld is alive" ] ; then
cecho "- FINAL LOGIN ATTEMPT FAILED -" boldred
cecho "Unable to log into socket: $socket" boldred
exit 1
fi
}
second_login_failed () {
## -- create a ~/.my.cnf and exit when all else fails -- ##
cecho "Could not auto detect login info!"
cecho "Found potential sockets: $found_socks"
cecho "Using: $socket" red
read -p "Would you like to provide a different socket?: [y/N] " REPLY
case $REPLY in
yes | y | Y | YES)
read -p "Socket: " socket
;;
esac
read -p "Do you have your login handy ? [y/N] : " REPLY
case $REPLY in
yes | y | Y | YES)
answer1='yes'
read -p "User: " user
read -rp "Password: " pass
if [ -z $pass ] ; then
export mysql="$mysql -S$socket -u$user"
export mysqladmin="$mysqladmin -S$socket -u$user"
else
export mysql="$mysql -S$socket -u$user -p$pass"
export mysqladmin="$mysqladmin -S$socket -u$user -p$pass"
fi
;;
*)
cecho "Please create a valid login to MySQL"
cecho "Or, set correct values for 'user=' and 'password=' in ~/.my.cnf"
;;
esac
cecho " "
read -p "Would you like me to create a ~/.my.cnf file for you? [y/N] : " REPLY
case $REPLY in
yes | y | Y | YES)
answer2='yes'
if [ ! -f ~/.my.cnf ] ; then
umask 077
printf "[client]\nuser=$user\npassword=$pass\nsocket=$socket" > ~/.my.cnf
if [ "$answer1" != 'yes' ] ; then
exit 1
else
final_login_attempt
return 0
fi
else
printf "\n"
cecho "~/.my.cnf already exists!" boldred
printf "\n"
read -p "Replace ? [y/N] : " REPLY
if [ "$REPLY" = 'y' ] || [ "$REPLY" = 'Y' ] ; then
printf "[client]\nuser=$user\npassword=$pass\socket=$socket" > ~/.my.cnf
if [ "$answer1" != 'yes' ] ; then
exit 1
else
final_login_attempt
return 0
fi
else
cecho "Please set the 'user=' and 'password=' and 'socket=' values in ~/.my.cnf"
exit 1
fi
fi
;;
*)
if [ "$answer1" != 'yes' ] ; then
exit 1
else
final_login_attempt
return 0
fi
;;
esac
}
find_webmin_passwords () {
## -- populate the .my.cnf file using values harvested from Webmin -- ##
cecho "Testing for stored webmin passwords:"
if [ -f /etc/webmin/mysql/config ] ; then
user=$(grep ^login= /etc/webmin/mysql/config | cut -d "=" -f 2)
pass=$(grep ^pass= /etc/webmin/mysql/config | cut -d "=" -f 2)
if [ $user ] && [ $pass ] && [ ! -f ~/.my.cnf ] ; then
cecho "Setting login info as User: $user Password: $pass"
touch ~/.my.cnf
chmod 600 ~/.my.cnf
printf "[client]\nuser=$user\npassword=$pass" > ~/.my.cnf
cecho "Retrying login"
is_up=$($mysqladmin ping 2>&1)
if [ "$is_up" = "mysqld is alive" ] ; then
echo UP > /dev/null
else
second_login_failed
fi
echo
else
second_login_failed
echo
fi
else
cecho " None Found" boldred
second_login_failed
fi
}
#########################################################################
# #
# Function to pull MySQL status variable #
# #
# Call using : #
# mysql_status \'Mysql_status_variable\' bash_dest_variable #
# #
#########################################################################
mysql_status () {
local status=$($mysql -Bse "show /*!50000 global */ status like $1" | awk '{ print $2 }')
export "$2"=$status
}
#########################################################################
# #
# Function to pull MySQL server runtime variable #
# #
# Call using : #
# mysql_variable \'Mysql_server_variable\' bash_dest_variable #
# - OR - #
# mysql_variableTSV \'Mysql_server_variable\' bash_dest_variable #
# #
#########################################################################
mysql_variable () {
local variable=$($mysql -Bse "show /*!50000 global */ variables like $1" | awk '{ print $2 }')
export "$2"=$variable
}
mysql_variableTSV () {
local variable=$($mysql -Bse "show /*!50000 global */ variables like $1" | awk -F \t '{ print $2 }')
export "$2"=$variable
}
float2int () {
local variable=$(echo "$1 / 1" | bc -l)
export "$2"=$variable
}
divide () {
# -- Divide two intigers -- #
usage="$0 dividend divisor '$variable' scale"
if [ $1 -ge 1 ] ; then
dividend=$1
else
cecho "Invalid Dividend" red
echo $usage
exit 1
fi
if [ $2 -ge 1 ] ; then
divisor=$2
else
cecho "Invalid Divisor" red
echo $usage
exit 1
fi
if [ ! -n $3 ] ; then
cecho "Invalid variable name" red
echo $usage
exit 1
fi
if [ -z $4 ] ; then
scale=2
elif [ $4 -ge 0 ] ; then
scale=$4
else
cecho "Invalid scale" red
echo $usage
exit 1
fi
export $3=$(echo "scale=$scale; $dividend / $divisor" | bc -l)
}
human_readable () {
#########################################################################
# #
# Convert a value in to human readable size and populate a variable #
# with the result. #
# #
# Call using: #
# human_readable $value 'variable name' [ places of precision] #
# #
#########################################################################
## value=$1
## variable=$2
scale=$3
if [ $1 -ge 1073741824 ] ; then
if [ -z $3 ] ; then
scale=2
fi
divide $1 1073741824 "$2" $scale
unit="G"
elif [ $1 -ge 1048576 ] ; then
if [ -z $3 ] ; then
scale=0
fi
divide $1 1048576 "$2" $scale
unit="M"
elif [ $1 -ge 1024 ] ; then
if [ -z $3 ] ; then
scale=0
fi
divide $1 1024 "$2" $scale
unit="K"
else
export "$2"=$1
unit="bytes"
fi
# let "$2"=$HR
}
human_readable_time () {
########################################################################
# #
# Function to produce human readable time #
# #
########################################################################
usage="$0 seconds 'variable'"
if [ -z $1 ] || [ -z $2 ] ; then
cecho $usage red
exit 1
fi
days=$(echo "scale=0 ; $1 / 86400" | bc -l)
remainder=$(echo "scale=0 ; $1 % 86400" | bc -l)
hours=$(echo "scale=0 ; $remainder / 3600" | bc -l)
remainder=$(echo "scale=0 ; $remainder % 3600" | bc -l)
minutes=$(echo "scale=0 ; $remainder / 60" | bc -l)
seconds=$(echo "scale=0 ; $remainder % 60" | bc -l)
export $2="$days days $hours hrs $minutes min $seconds sec"
}
check_mysql_version () {
## -- Print Version Info -- ##
mysql_variable \'version\' mysql_version
mysql_variable \'version_compile_machine\' mysql_version_compile_machine
if [ "$mysql_version_num" -lt 050000 ]; then
cecho "MySQL Version $mysql_version $mysql_version_compile_machine is EOL please upgrade to MySQL 4.1 or later" boldred
else
cecho "MySQL Version $mysql_version $mysql_version_compile_machine"
fi
}
post_uptime_warning () {
#########################################################################
# #
# Present a reminder that mysql must run for a couple of days to #
# build up good numbers in server status variables before these tuning #
# suggestions should be used. #
# #
#########################################################################
mysql_status \'Uptime\' uptime
mysql_status \'Threads_connected\' threads
queries_per_sec=$(($questions/$uptime))
human_readable_time $uptime uptimeHR
cecho "Uptime = $uptimeHR"
cecho "Avg. qps = $queries_per_sec"
cecho "Total Questions = $questions"
cecho "Threads Connected = $threads"
echo
if [ $uptime -gt 172800 ] ; then
cecho "Server has been running for over 48hrs."
cecho "It should be safe to follow these recommendations"
else
cechon "Warning: " boldred
cecho "Server has not been running for at least 48hrs." boldred
cecho "It may not be safe to use these recommendations" boldred
fi
echo ""
cecho "To find out more information on how each of these" red
cecho "runtime variables effects performance visit:" red
if [ "$major_version" = '3.23' ] || [ "$major_version" = '4.0' ] || [ "$major_version" = '4.1' ] ; then
cecho "http://dev.mysql.com/doc/refman/4.1/en/server-system-variables.html" boldblue
elif [ "$major_version" = '5.0' ] || [ "$mysql_version_num" -gt '050100' ]; then
cecho "http://dev.mysql.com/doc/refman/$major_version/en/server-system-variables.html" boldblue
else
cecho "UNSUPPORTED MYSQL VERSION" boldred
exit 1
fi
cecho "Visit http://www.mysql.com/products/enterprise/advisors.html" boldblue
cecho "for info about MySQL's Enterprise Monitoring and Advisory Service" boldblue
}
check_slow_queries () {
## -- Slow Queries -- ##
cecho "SLOW QUERIES" boldblue
mysql_status \'Slow_queries\' slow_queries
mysql_variable \'long_query_time\' long_query_time
mysql_variable \'log%queries\' log_slow_queries
prefered_query_time=5
if [ -e /etc/my.cnf ] ; then
if [ -z $log_slow_queries ] ; then
log_slow_queries=$(grep log-slow-queries /etc/my.cnf)
fi
fi
if [ "$log_slow_queries" = 'ON' ] ; then
cecho "The slow query log is enabled."
elif [ "$log_slow_queries" = 'OFF' ] ; then
cechon "The slow query log is "
cechon "NOT" boldred
cecho " enabled."
elif [ -z $log_slow_queries ] ; then
cechon "The slow query log is "
cechon "NOT" boldred
cecho " enabled."
else
cecho "Error: $log_slow_queries" boldred
fi
cecho "Current long_query_time = $long_query_time sec."
cechon "You have "
cechon "$slow_queries" boldred
cechon " out of "
cechon "$questions" boldred
cecho " that take longer than $long_query_time sec. to complete"
float2int long_query_time long_query_timeInt
if [ $long_query_timeInt -gt $prefered_query_time ] ; then
cecho "Your long_query_time may be too high, I typically set this under $prefered_query_time sec." red
else
cecho "Your long_query_time seems to be fine" green
fi
}
check_binary_log () {
## -- Binary Log -- ##
cecho "BINARY UPDATE LOG" boldblue
mysql_variable \'log_bin\' log_bin
mysql_variable \'max_binlog_size\' max_binlog_size
mysql_variable \'expire_logs_days\' expire_logs_days
mysql_variable \'sync_binlog\' sync_binlog
# mysql_variable \'max_binlog_cache_size\' max_binlog_cache_size
if [ "$log_bin" = 'ON' ] ; then
cecho "The binary update log is enabled"
if [ -z "$max_binlog_size" ] ; then
cecho "The max_binlog_size is not set. The binary log will rotate when it reaches 1GB." red
fi
if [ "$expire_logs_days" -eq 0 ] ; then
cecho "The expire_logs_days is not set." boldred
cechon "The mysqld will retain the entire binary log until " red
cecho "RESET MASTER or PURGE MASTER LOGS commands are run manually" red
cecho "Setting expire_logs_days will allow you to remove old binary logs automatically" yellow
cecho "See http://dev.mysql.com/doc/refman/$major_version/en/purge-master-logs.html" yellow
fi
if [ "$sync_binlog" = 0 ] ; then
cecho "Binlog sync is not enabled, you could loose binlog records during a server crash" red
fi
else
cechon "The binary update log is "
cechon "NOT " boldred
cecho "enabled."
cecho "You will not be able to do point in time recovery" red
cecho "See http://dev.mysql.com/doc/refman/$major_version/en/point-in-time-recovery.html" yellow
fi
}
check_used_connections () {
## -- Used Connections -- ##
mysql_variable \'max_connections\' max_connections
mysql_status \'Max_used_connections\' max_used_connections
mysql_status \'Threads_connected\' threads_connected
connections_ratio=$(($max_used_connections*100/$max_connections))
cecho "MAX CONNECTIONS" boldblue
cecho "Current max_connections = $max_connections"
cecho "Current threads_connected = $threads_connected"
cecho "Historic max_used_connections = $max_used_connections"
cechon "The number of used connections is "
if [ $connections_ratio -ge 85 ] ; then
txt_color=red
error=1
elif [ $connections_ratio -le 10 ] ; then
txt_color=red
error=2
else
txt_color=green
error=0
fi
# cechon "$max_used_connections " $txt_color
# cechon "which is "
cechon "$connections_ratio% " $txt_color
cecho "of the configured maximum."
if [ $error -eq 1 ] ; then
cecho "You should raise max_connections" $txt_color
elif [ $error -eq 2 ] ; then
cecho "You are using less than 10% of your configured max_connections." $txt_color
cecho "Lowering max_connections could help to avoid an over-allocation of memory" $txt_color
cecho "See \"MEMORY USAGE\" section to make sure you are not over-allocating" $txt_color
else
cecho "Your max_connections variable seems to be fine." $txt_color
fi
unset txt_color
}
check_threads() {
## -- Worker Threads -- ##
cecho "WORKER THREADS" boldblue
mysql_status \'Threads_created\' threads_created1
sleep 1
mysql_status \'Threads_created\' threads_created2
mysql_status \'Threads_cached\' threads_cached
mysql_status \'Uptime\' uptime
mysql_variable \'thread_cache_size\' thread_cache_size
historic_threads_per_sec=$(($threads_created1/$uptime))
current_threads_per_sec=$(($threads_created2-$threads_created1))
cecho "Current thread_cache_size = $thread_cache_size"
cecho "Current threads_cached = $threads_cached"
cecho "Current threads_per_sec = $current_threads_per_sec"
cecho "Historic threads_per_sec = $historic_threads_per_sec"
if [ $historic_threads_per_sec -ge 2 ] && [ $threads_cached -le 1 ] ; then
cecho "Threads created per/sec are overrunning threads cached" red
cecho "You should raise thread_cache_size" red
elif [ $current_threads_per_sec -ge 2 ] ; then
cecho "Threads created per/sec are overrunning threads cached" red
cecho "You should raise thread_cache_size" red
else
cecho "Your thread_cache_size is fine" green
fi
}
check_key_buffer_size () {
## -- Key buffer Size -- ##
cecho "KEY BUFFER" boldblue
mysql_status \'Key_read_requests\' key_read_requests
mysql_status \'Key_reads\' key_reads
mysql_status \'Key_blocks_used\' key_blocks_used
mysql_status \'Key_blocks_unused\' key_blocks_unused
mysql_variable \'key_cache_block_size\' key_cache_block_size
mysql_variable \'key_buffer_size\' key_buffer_size
mysql_variable \'datadir\' datadir
mysql_variable \'version_compile_machine\' mysql_version_compile_machine
myisam_indexes=$($mysql -Bse "/*!50000 SELECT IFNULL(SUM(INDEX_LENGTH),0) from information_schema.TABLES where ENGINE='MyISAM' */")
if [ -z $myisam_indexes ] ; then
myisam_indexes=$(find $datadir -name '*.MYI' -exec du $duflags '{}' \; 2>&1 | awk '{ s += $1 } END { printf("%.0f\n", s )}')
fi
if [ $key_reads -eq 0 ] ; then
cecho "No key reads?!" boldred
cecho "Seriously look into using some indexes" red
key_cache_miss_rate=0
key_buffer_free=$(echo "$key_blocks_unused * $key_cache_block_size / $key_buffer_size * 100" | bc -l )
key_buffer_freeRND=$(echo "scale=0; $key_buffer_free / 1" | bc -l)
else
key_cache_miss_rate=$(($key_read_requests/$key_reads))
if [ ! -z $key_blocks_unused ] ; then
key_buffer_free=$(echo "$key_blocks_unused * $key_cache_block_size / $key_buffer_size * 100" | bc -l )
key_buffer_freeRND=$(echo "scale=0; $key_buffer_free / 1" | bc -l)
else
key_buffer_free='Unknown'
key_buffer_freeRND=75
fi
fi
human_readable $myisam_indexes myisam_indexesHR
cecho "Current MyISAM index space = $myisam_indexesHR $unit"
human_readable $key_buffer_size key_buffer_sizeHR
cecho "Current key_buffer_size = $key_buffer_sizeHR $unit"
cecho "Key cache miss rate is 1 : $key_cache_miss_rate"
cecho "Key buffer free ratio = $key_buffer_freeRND %"
if [ "$major_version" = '5.1' ] && [ $mysql_version_num -lt 050123 ] ; then
if [ $key_buffer_size -ge 4294967296 ] && ( echo "x86_64 ppc64 ia64 sparc64 i686" | grep -q $mysql_version_compile_machine ) ; then
cecho "Using key_buffer_size > 4GB will cause instability in versions prior to 5.1.23 " boldred
cecho "See Bug#5731, Bug#29419, Bug#29446" boldred
fi
fi
if [ "$major_version" = '5.0' ] && [ $mysql_version_num -lt 050052 ] ; then
if [ $key_buffer_size -ge 4294967296 ] && ( echo "x86_64 ppc64 ia64 sparc64 i686" | grep -q $mysql_version_compile_machine ) ; then
cecho "Using key_buffer_size > 4GB will cause instability in versions prior to 5.0.52 " boldred
cecho "See Bug#5731, Bug#29419, Bug#29446" boldred
fi
fi
if [ "$major_version" = '4.1' -o "$major_version" = '4.0' ] && [ $key_buffer_size -ge 4294967296 ] && ( echo "x86_64 ppc64 ia64 sparc64 i686" | grep -q $mysql_version_compile_machine ) ; then
cecho "Using key_buffer_size > 4GB will cause instability in versions prior to 5.0.52 " boldred
cecho "Reduce key_buffer_size to a safe value" boldred
cecho "See Bug#5731, Bug#29419, Bug#29446" boldred
fi
if [ $key_cache_miss_rate -le 100 ] && [ $key_cache_miss_rate -gt 0 ] && [ $key_buffer_freeRND -le 20 ]; then
cecho "You could increase key_buffer_size" boldred
cecho "It is safe to raise this up to 1/4 of total system memory;"
cecho "assuming this is a dedicated database server."
elif [ $key_buffer_freeRND -le 20 ] && [ $key_buffer_size -le $myisam_indexes ] ; then
cecho "You could increase key_buffer_size" boldred
cecho "It is safe to raise this up to 1/4 of total system memory;"
cecho "assuming this is a dedicated database server."
elif [ $key_cache_miss_rate -ge 10000 ] || [ $key_buffer_freeRND -le 50 ] ; then
cecho "Your key_buffer_size seems to be too high." red
cecho "Perhaps you can use these resources elsewhere" red
else
cecho "Your key_buffer_size seems to be fine" green
fi
}
check_query_cache () {
## -- Query Cache -- ##
cecho "QUERY CACHE" boldblue
mysql_variable \'version\' mysql_version
mysql_variable \'query_cache_size\' query_cache_size
mysql_variable \'query_cache_limit\' query_cache_limit
mysql_variable \'query_cache_min_res_unit\' query_cache_min_res_unit
mysql_status \'Qcache_free_memory\' qcache_free_memory
mysql_status \'Qcache_total_blocks\' qcache_total_blocks
mysql_status \'Qcache_free_blocks\' qcache_free_blocks
mysql_status \'Qcache_lowmem_prunes\' qcache_lowmem_prunes
if [ -z $query_cache_size ] ; then
cecho "You are using MySQL $mysql_version, no query cache is supported." red
cecho "I recommend an upgrade to MySQL 4.1 or better" red
elif [ $query_cache_size -eq 0 ] ; then
cecho "Query cache is supported but not enabled" red
cecho "Perhaps you should set the query_cache_size" red
else
qcache_used_memory=$(($query_cache_size-$qcache_free_memory))
qcache_mem_fill_ratio=$(echo "scale=2; $qcache_used_memory * 100 / $query_cache_size" | bc -l)
qcache_mem_fill_ratioHR=$(echo "scale=0; $qcache_mem_fill_ratio / 1" | bc -l)
cecho "Query cache is enabled" green
human_readable $query_cache_size query_cache_sizeHR
cecho "Current query_cache_size = $query_cache_sizeHR $unit"
human_readable $qcache_used_memory qcache_used_memoryHR
cecho "Current query_cache_used = $qcache_used_memoryHR $unit"
human_readable $query_cache_limit query_cache_limitHR
cecho "Current query_cache_limit = $query_cache_limitHR $unit"
cecho "Current Query cache Memory fill ratio = $qcache_mem_fill_ratio %"
if [ -z $query_cache_min_res_unit ] ; then
cecho "No query_cache_min_res_unit is defined. Using MySQL < 4.1 cache fragmentation can be inpredictable" %yellow
else
human_readable $query_cache_min_res_unit query_cache_min_res_unitHR
cecho "Current query_cache_min_res_unit = $query_cache_min_res_unitHR $unit"
fi
if [ $qcache_free_blocks -gt 2 ] && [ $qcache_total_blocks -gt 0 ] ; then
qcache_percent_fragmented=$(echo "scale=2; $qcache_free_blocks * 100 / $qcache_total_blocks" | bc -l)
qcache_percent_fragmentedHR=$(echo "scale=0; $qcache_percent_fragmented / 1" | bc -l)
if [ $qcache_percent_fragmentedHR -gt 20 ] ; then
cecho "Query Cache is $qcache_percent_fragmentedHR % fragmented" red
cecho "Run \"FLUSH QUERY CACHE\" periodically to defragment the query cache memory" red
cecho "If you have many small queries lower 'query_cache_min_res_unit' to reduce fragmentation." red
fi
fi
if [ $qcache_mem_fill_ratioHR -le 25 ] ; then
cecho "Your query_cache_size seems to be too high." red
cecho "Perhaps you can use these resources elsewhere" red
fi
if [ $qcache_lowmem_prunes -ge 50 ] && [ $qcache_mem_fill_ratioHR -ge 80 ]; then
cechon "However, "
cechon "$qcache_lowmem_prunes " boldred
cecho "queries have been removed from the query cache due to lack of memory"
cecho "Perhaps you should raise query_cache_size" boldred
fi
cecho "MySQL won't cache query results that are larger than query_cache_limit in size" yellow
fi
}
check_sort_operations () {
## -- Sort Operations -- ##
cecho "SORT OPERATIONS" boldblue
mysql_status \'Sort_merge_passes\' sort_merge_passes
mysql_status \'Sort_scan\' sort_scan
mysql_status \'Sort_range\' sort_range
mysql_variable \'sort_buffer%\' sort_buffer_size
mysql_variable \'read_rnd_buffer_size\' read_rnd_buffer_size
total_sorts=$(($sort_scan+$sort_range))
if [ -z $read_rnd_buffer_size ] ; then
mysql_variable \'record_buffer\' read_rnd_buffer_size
fi
## Correct for rounding error in mysqld where 512K != 524288 ##
sort_buffer_size=$(($sort_buffer_size+8))
read_rnd_buffer_size=$(($read_rnd_buffer_size+8))
human_readable $sort_buffer_size sort_buffer_sizeHR
cecho "Current sort_buffer_size = $sort_buffer_sizeHR $unit"
human_readable $read_rnd_buffer_size read_rnd_buffer_sizeHR
cechon "Current "
if [ "$major_version" = '3.23' ] ; then
cechon "record_rnd_buffer "
else
cechon "read_rnd_buffer_size "
fi
cecho "= $read_rnd_buffer_sizeHR $unit"
if [ $total_sorts -eq 0 ] ; then
cecho "No sort operations have been performed"
passes_per_sort=0
fi
if [ $sort_merge_passes -ne 0 ] ; then
passes_per_sort=$(($sort_merge_passes/$total_sorts))
else
passes_per_sort=0
fi
if [ $passes_per_sort -ge 2 ] ; then
cechon "On average "
cechon "$passes_per_sort " boldred
cecho "sort merge passes are made per sort operation"
cecho "You should raise your sort_buffer_size"
cechon "You should also raise your "
if [ "$major_version" = '3.23' ] ; then
cecho "record_rnd_buffer_size"
else
cecho "read_rnd_buffer_size"
fi
else
cecho "Sort buffer seems to be fine" green
fi
}
check_join_operations () {
## -- Joins -- ##
cecho "JOINS" boldblue
mysql_status \'Select_full_join\' select_full_join
mysql_status \'Select_range_check\' select_range_check
mysql_variable \'join_buffer%\' join_buffer_size
## Some 4K is dropped from join_buffer_size adding it back to make sane ##
## handling of human-readable conversion ##
join_buffer_size=$(($join_buffer_size+4096))
human_readable $join_buffer_size join_buffer_sizeHR 2
cecho "Current join_buffer_size = $join_buffer_sizeHR $unit"
cecho "You have had $select_full_join queries where a join could not use an index properly"
if [ $select_range_check -eq 0 ] && [ $select_full_join -eq 0 ] ; then
cecho "Your joins seem to be using indexes properly" green
fi
if [ $select_full_join -gt 0 ] ; then
print_error='true'
raise_buffer='true'
fi
if [ $select_range_check -gt 0 ] ; then
cecho "You have had $select_range_check joins without keys that check for key usage after each row" red
print_error='true'
raise_buffer='true'
fi
## For Debuging ##
# print_error='true'
if [ $join_buffer_size -ge 4194304 ] ; then
cecho "join_buffer_size >= 4 M" boldred
cecho "This is not advised" boldred
raise_buffer=
fi
if [ $print_error ] ; then
if [ "$major_version" = '3.23' ] || [ "$major_version" = '4.0' ] ; then
cecho "You should enable \"log-long-format\" "
elif [ "$mysql_version_num" -gt 040100 ]; then
cecho "You should enable \"log-queries-not-using-indexes\""
fi
cecho "Then look for non indexed joins in the slow query log."
if [ $raise_buffer ] ; then
cecho "If you are unable to optimize your queries you may want to increase your"
cecho "join_buffer_size to accommodate larger joins in one pass."
printf "\n"
cecho "Note! This script will still suggest raising the join_buffer_size when" boldred
cecho "ANY joins not using indexes are found." boldred
fi
fi
# XXX Add better tests for join_buffer_size pending mysql bug #15088 XXX #
}
check_tmp_tables () {
## -- Temp Tables -- ##
cecho "TEMP TABLES" boldblue