mysqltuner.pl
Use the following script to analyze MySQL database for tuning purposes.
#!/usr/bin/perl -w
# mysqltuner.pl - Version 1.0.0
# High Performance MySQL Tuning Script
# Copyright (C) 2006-2008 Major Hayden - major@mhtx.net
#
# For the latest updates, please visit http://mysqltuner.com/
# Subversion repository available at http://tools.assembla.com/svn/mysqltuner/
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This project would not be possible without help from:
# Matthew Montgomery Paul Kehrer
# Dave Burgess Jonathan Hinds
# Mike Jackson Nils Breunese
# Shawn Ashlee Luuk Vosslamber
# Ville Skytta Trent Hornibrook
# Jason Gill Mark Imbriaco
# Greg Eden Aubin Galinotti
# Giovanni Bechis Bill Bradford
# Ryan Novosielski Michael Scheidell
# Blair Christensen Hans du Plooy
# Victor Trac Everett Barnes
#
# Inspired by Matthew Montgomery's tuning-primer.sh script:
use strict;
use warnings;
use diagnostics;
use Getopt::Long;
# Set up a few variables for use in the script
my $tunerversion = "1.0.0";
my (@adjvars, @generalrec);
# Set defaults
my %opt = (
"nobad" => 0,
"nogood" => 0,
"noinfo" => 0,
"nocolor" => 0,
"forcemem" => 0,
"forceswap" => 0,
"host" => 0,
"socket" => 0,
"port" => 0,
"user" => 0,
"pass" => 0,
"skipsize" => 0,
"checkversion" => 0,
);
# Gather the options from the command line
GetOptions(\%opt,
'nobad',
'nogood',
'noinfo',
'nocolor',
'forcemem=i',
'forceswap=i',
'host=s',
'socket=s',
'port=i',
'user=s',
'pass=s',
'skipsize',
'checkversion',
'help',
);
if (defined $opt{'help'} && $opt{'help'} == 1) { usage(); }
sub usage {
# Shown with --help option passed
print "\n".
" MySQLTuner $tunerversion - MySQL High Performance Tuning Script\n".
" Bug reports, feature requests, and downloads at http://mysqltuner.com/\n".
" Maintained by Major Hayden (major\@mhtx.net) - Licensed under GPL\n".
"\n".
" Important Usage Guidelines:\n".
" To run the script with the default options, run the script without arguments\n".
" Allow MySQL server to run for at least 24-48 hours before trusting suggestions\n".
" Some routines may require root level privileges (script will provide warnings)\n".
" You must provide the remote server's total memory when connecting to other servers\n".
"\n".
" Connection and Authentication\n".
" --host <hostname> Connect to a remote host to perform tests (default: localhost)\n".
" --socket <socket> Use a different socket for a local connection\n".
" --port <port> Port to use for connection (default: 3306)\n".
" --user <username> Username to use for authentication\n".
" --pass <password> Password to use for authentication\n".
"\n".
" Performance and Reporting Options\n".
" --skipsize Don't enumerate tables and their types/sizes (default: on)\n".
" (Recommended for servers with many tables)\n".
" --checkversion Check for updates to MySQLTuner (default: don't check)\n".
" --forcemem <size> Amount of RAM installed in megabytes\n".
" --forceswap <size> Amount of swap memory configured in megabytes\n".
"\n".
" Output Options:\n".
" --nogood Remove OK responses\n".
" --nobad Remove negative/suggestion responses\n".
" --noinfo Remove informational responses\n".
" --nocolor Don't print output in color\n".
"\n";
exit;
}
# Setting up the colors for the print styles
my $good = ($opt{nocolor} == 0)? "[\e[00;32mOK\e[00m]" : "[OK]" ;
my $bad = ($opt{nocolor} == 0)? "[\e[00;31m!!\e[00m]" : "[!!]" ;
my $info = ($opt{nocolor} == 0)? "[\e[00;34m--\e[00m]" : "[--]" ;
# Functions that handle the print styles
sub goodprint { print $good." ".$_[0] unless ($opt{nogood} == 1); }
sub infoprint { print $info." ".$_[0] unless ($opt{noinfo} == 1); }
sub badprint { print $bad." ".$_[0] unless ($opt{nobad} == 1); }
sub redwrap { return ($opt{nocolor} == 0)? "\e[00;31m".$_[0]."\e[00m" : $_[0] ; }
sub greenwrap { return ($opt{nocolor} == 0)? "\e[00;32m".$_[0]."\e[00m" : $_[0] ; }
# Calculates the parameter passed in bytes, and then rounds it to one decimal place
sub hr_bytes {
my $num = shift;
if ($num >= (1024**3)) { #GB
return sprintf("%.1f",($num/(1024**3)))."G";
} elsif ($num >= (1024**2)) { #MB
return sprintf("%.1f",($num/(1024**2)))."M";
} elsif ($num >= 1024) { #KB
return sprintf("%.1f",($num/1024))."K";
} else {
return $num."B";
}
}
# Calculates the parameter passed in bytes, and then rounds it to the nearest integer
sub hr_bytes_rnd {
my $num = shift;
if ($num >= (1024**3)) { #GB
return int(($num/(1024**3)))."G";
} elsif ($num >= (1024**2)) { #MB
return int(($num/(1024**2)))."M";
} elsif ($num >= 1024) { #KB
return int(($num/1024))."K";
} else {
return $num."B";
}
}
# Calculates the parameter passed to the nearest power of 1000, then rounds it to the nearest integer
sub hr_num {
my $num = shift;
if ($num >= (1000**3)) { # Billions
return int(($num/(1000**3)))."B";
} elsif ($num >= (1000**2)) { # Millions
return int(($num/(1000**2)))."M";
} elsif ($num >= 1000) { # Thousands
return int(($num/1000))."K";
} else {
return $num;
}
}
# Calculates uptime to display in a more attractive form
sub pretty_uptime {
my $uptime = shift;
my $seconds = $uptime % 60;
my $minutes = int(($uptime % 3600) / 60);
my $hours = int(($uptime % 86400) / (3600));
my $days = int($uptime / (86400));
my $uptimestring;
if ($days > 0) {
$uptimestring = "${days}d ${hours}h ${minutes}m ${seconds}s";
} elsif ($hours > 0) {
$uptimestring = "${hours}h ${minutes}m ${seconds}s";
} elsif ($minutes > 0) {
$uptimestring = "${minutes}m ${seconds}s";
} else {
$uptimestring = "${seconds}s";
}
return $uptimestring;
}
# Retrieves the memory installed on this machine
my ($physical_memory,$swap_memory,$duflags);
sub os_setup {
sub memerror {
badprint "Unable to determine total memory/swap; use '--forcemem' and '--forceswap'\n";
exit;
}
my $os = `uname`;
$duflags = ($os =~ /Linux/) ? '-b' : '';
if ($opt{'forcemem'} > 0) {
$physical_memory = $opt{'forcemem'} * 1048576;
infoprint "Assuming $opt{'forcemem'} MB of physical memory\n";
if ($opt{'forceswap'} > 0) {
$swap_memory = $opt{'forceswap'} * 1048576;
infoprint "Assuming $opt{'forceswap'} MB of swap space\n";
} else {
$swap_memory = 0;
badprint "Assuming 0 MB of swap space (use --forceswap to specify)\n";
}
} else {
if ($os =~ /Linux/) {
$physical_memory = `free -b | grep Mem | awk '{print \$2}'` or memerror;
$swap_memory = `free -b | grep Swap | awk '{print \$2}'` or memerror;
} elsif ($os =~ /Darwin/) {
$physical_memory = `sysctl -n hw.memsize` or memerror;
$swap_memory = `sysctl -n vm.swapusage | awk '{print \$3}' | sed 's/\..*\$//'` or memerror;
} elsif ($os =~ /NetBSD|OpenBSD/) {
$physical_memory = `sysctl -n hw.physmem` or memerror;
if ($physical_memory < 0) {
$physical_memory = `sysctl -n hw.physmem64` or memerror;
}
$swap_memory = `swapctl -l | grep '^/' | awk '{ s+= \$2 } END { print s }'` or memerror;
} elsif ($os =~ /BSD/) {
$physical_memory = `sysctl -n hw.realmem`;
$swap_memory = `swapinfo | grep '^/' | awk '{ s+= \$2 } END { print s }'`;
} elsif ($os =~ /SunOS/) {
$physical_memory = `/usr/sbin/prtconf | grep Memory | awk '{print \$3}'` or memerror;
chomp($physical_memory);
$physical_memory = $physical_memory*1024*1024;
}
}
chomp($physical_memory);
}
# Checks to see if a MySQL login is possible
my ($mysqllogin,$doremote,$remotestring);
sub mysql_setup {
$doremote = 0;
$remotestring = '';
my $command = `which mysqladmin`;
chomp($command);
if (! -e $command) {
badprint "Unable to find mysqladmin in your \$PATH. Is MySQL installed?\n";
exit;
}
# Are we being asked to connect via a socket?
if ($opt{socket} ne 0) {
$remotestring = " -S $opt{socket}";
}
# Are we being asked to connect to a remote server?
if ($opt{host} ne 0) {
chomp($opt{host});
$opt{port} = ($opt{port} eq 0)? 3306 : $opt{port} ;
# If we're doing a remote connection, but forcemem wasn't specified, we need to exit
if ($opt{'forcemem'} eq 0) {
badprint "The --forcemem option is required for remote connections\n";
exit;
}
infoprint "Performing tests on $opt{host}:$opt{port}\n";
$remotestring = " -h $opt{host} -P $opt{port}";
$doremote = 1;
}
# Did we already get a username and password passed on the command line?
if ($opt{user} ne 0 and $opt{pass} ne 0) {
$mysqllogin = "-u $opt{user} -p'$opt{pass}'".$remotestring;
my $loginstatus = `mysqladmin ping $mysqllogin 2>&1`;
if ($loginstatus =~ /mysqld is alive/) {
goodprint "Logged in using credentials passed on the command line\n";
return 1;
} else {
badprint "Attempted to use login credentials, but they were invalid\n";
exit 0;
}
}
if ( -r "/etc/psa/.psa.shadow" and $doremote == 0 ) {
# It's a Plesk box, use the available credentials
$mysqllogin = "-u admin -p`cat /etc/psa/.psa.shadow`";
my $loginstatus = `mysqladmin ping $mysqllogin 2>&1`;
unless ($loginstatus =~ /mysqld is alive/) {
badprint "Attempted to use login credentials from Plesk, but they failed.\n";
exit 0;
}
} else {
# It's not Plesk, we should try a login
my $loginstatus = `mysqladmin $remotestring ping 2>&1`;
if ($loginstatus =~ /mysqld is alive/) {
# Login went just fine
$mysqllogin = " $remotestring ";
# Did this go well because of a .my.cnf file or is there no password set?
my $userpath = `ls -d ~ 2>/dev/null`;
if (length($userpath) > 0) {
chomp($userpath);
}
unless ( -e "${userpath}/.my.cnf" ) {
badprint "Successfully authenticated with no password - SECURITY RISK!\n";
}
return 1;
} else {
print STDERR "Please enter your MySQL administrative login: ";
my $name = <>;
print STDERR "Please enter your MySQL administrative password: ";
system("stty -echo");
my $password = <>;
system("stty echo");
chomp($password);
chomp($name);
$mysqllogin = "-u $name";
if (length($password) > 0) {
$mysqllogin .= " -p'$password'";
}
$mysqllogin .= $remotestring;
my $loginstatus = `mysqladmin ping $mysqllogin 2>&1`;
if ($loginstatus =~ /mysqld is alive/) {
print STDERR "\n";
if (! length($password)) {
# Did this go well because of a .my.cnf file or is there no password set?
my $userpath = `ls -d ~`;
chomp($userpath);
unless ( -e "$userpath/.my.cnf" ) {
badprint "Successfully authenticated with no password - SECURITY RISK!\n";
}
}
return 1;
} else {
print "\n".$bad." Attempted to use login credentials, but they were invalid.\n";
exit 0;
}
exit 0;
}
}
}
# Populates all of the variable and status hashes
my (%mystat,%myvar,$dummyselect);
sub get_all_vars {
# We need to initiate at least one query so that our data is useable
$dummyselect = `mysql $mysqllogin -Bse "SELECT VERSION();"`;
my @mysqlvarlist = `mysql $mysqllogin -Bse "SHOW /*!50000 GLOBAL */ VARIABLES;"`;
foreach my $line (@mysqlvarlist) {
$line =~ /([a-zA-Z_]*)\s*(.*)/;
$myvar{$1} = $2;
}
my @mysqlstatlist = `mysql $mysqllogin -Bse "SHOW /*!50000 GLOBAL */ STATUS;"`;
foreach my $line (@mysqlstatlist) {
$line =~ /([a-zA-Z_]*)\s*(.*)/;
$mystat{$1} = $2;
}
}
# Checks for updates to MySQLTuner
sub validate_tuner_version {
print "\n-------- General Statistics --------------------------------------------------\n";
if ($opt{checkversion} eq 0) {
infoprint "Skipped version check for MySQLTuner script\n";
return;
}
my $update;
my $url = "http://mysqltuner.com/versioncheck.php?v=$tunerversion";
if (-e "/usr/bin/curl") {
$update = `/usr/bin/curl --connect-timeout 5 '$url' 2>/dev/null`;
chomp($update);
} elsif (-e "/usr/bin/wget") {
$update = `/usr/bin/wget -e timestamping=off -T 5 -O - '$url' 2>/dev/null`;
chomp($update);
}
if ($update eq 1) {
badprint "There is a new version of MySQLTuner available\n";
} elsif ($update eq 0) {
goodprint "You have the latest version of MySQLTuner\n";
} else {
infoprint "Unable to check for the latest MySQLTuner version\n";
}
}
# Checks for supported or EOL'ed MySQL versions
my ($mysqlvermajor,$mysqlverminor);
sub validate_mysql_version {
($mysqlvermajor,$mysqlverminor) = $myvar{'version'} =~ /(\d)\.(\d)/;
if ($mysqlvermajor < 5) {
badprint "Your MySQL version ".$myvar{'version'}." is EOL software! Upgrade soon!\n";
} elsif ($mysqlvermajor == 5) {
goodprint "Currently running supported MySQL version ".$myvar{'version'}."\n";
} else {
badprint "Currently running unsupported MySQL version ".$myvar{'version'}."\n";
}
}
# Checks for 32-bit boxes with more than 2GB of RAM
my ($arch);
sub check_architecture {
if ($doremote eq 1) { return; }
if (`uname` =~ /SunOS/ && `isainfo -b` =~ /64/) {
$arch = 64;
goodprint "Operating on 64-bit architecture\n";
} elsif (`uname` !~ /SunOS/ && `uname -m` =~ /64/) {
$arch = 64;
goodprint "Operating on 64-bit architecture\n";
} else {
$arch = 32;
if ($physical_memory > 2147483648) {
badprint "Switch to 64-bit OS - MySQL cannot currently use all of your RAM\n";
} else {
goodprint "Operating on 32-bit architecture with less than 2GB RAM\n";
}
}
}
# Start up a ton of storage engine counts/statistics
my (%enginestats,%enginecount,$fragtables);
sub check_storage_engines {
if ($opt{skipsize} eq 1) {
print "\n-------- Storage Engine Statistics -------------------------------------------\n";
infoprint "Skipped due to --skipsize option\n";
return;
}
print "\n-------- Storage Engine Statistics -------------------------------------------\n";
infoprint "Status: ";
my $engines;
$engines .= (defined $myvar{'have_archive'} && $myvar{'have_archive'} eq "YES")? greenwrap "+Archive " : redwrap "-Archive " ;
$engines .= (defined $myvar{'have_bdb'} && $myvar{'have_bdb'} eq "YES")? greenwrap "+BDB " : redwrap "-BDB " ;
$engines .= (defined $myvar{'have_federated'} && $myvar{'have_federated'} eq "YES")? greenwrap "+Federated " : redwrap "-Federated " ;
$engines .= (defined $myvar{'have_innodb'} && $myvar{'have_innodb'} eq "YES")? greenwrap "+InnoDB " : redwrap "-InnoDB " ;
$engines .= (defined $myvar{'have_isam'} && $myvar{'have_isam'} eq "YES")? greenwrap "+ISAM " : redwrap "-ISAM " ;
$engines .= (defined $myvar{'have_ndbcluster'} && $myvar{'have_ndbcluster'} eq "YES")? greenwrap "+NDBCluster " : redwrap "-NDBCluster " ;
print "$engines\n";
if ($mysqlvermajor >= 5) {
# MySQL 5 servers can have table sizes calculated quickly from information schema
my @templist = `mysql $mysqllogin -Bse "SELECT ENGINE,SUM(DATA_LENGTH),COUNT(ENGINE) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema','mysql') GROUP BY ENGINE ORDER BY ENGINE ASC;"`;
foreach my $line (@templist) {
my ($engine,$size,$count);
($engine,$size,$count) = $line =~ /([a-zA-Z_]*)\s+(\d+)\s+(\d+)/;
if (!defined($size)) { next; }
$enginestats{$engine} = $size;
$enginecount{$engine} = $count;
}
$fragtables = `mysql $mysqllogin -Bse "SELECT COUNT(TABLE_NAME) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema','mysql') AND Data_free > 0"`;
chomp($fragtables);
} else {
# MySQL < 5 servers take a lot of work to get table sizes
my @tblist;
# Now we build a database list, and loop through it to get storage engine stats for tables
my @dblist = `mysql $mysqllogin -Bse "SHOW DATABASES"`;
foreach my $db (@dblist) {
chomp($db);
if ($db eq "information_schema") { next; }
if ($mysqlvermajor == 3 || ($mysqlvermajor == 4 && $mysqlverminor == 0)) {
# MySQL 3.23/4.0 keeps Data_Length in the 6th column
push (@tblist,`mysql $mysqllogin -Bse "SHOW TABLE STATUS FROM \\\`$db\\\`" | awk '{print \$2,\$6,\$9}'`);
} else {
# MySQL 4.1+ keeps Data_Length in the 7th column
push (@tblist,`mysql $mysqllogin -Bse "SHOW TABLE STATUS FROM \\\`$db\\\`" | awk '{print \$2,\$7,\$10}'`);
}
}
# Parse through the table list to generate storage engine counts/statistics
$fragtables = 0;
foreach my $line (@tblist) {
chomp($line);
$line =~ /([a-zA-Z_]*)\s+(\d+)\s+(\d+)/;
my $engine = $1;
my $size = $2;
my $datafree = $3;
if ($size !~ /^\d+$/) { $size = 0; }
if (defined $enginestats{$engine}) {
$enginestats{$engine} += $size;
$enginecount{$engine} += 1;
} else {
$enginestats{$engine} = $size;
$enginecount{$engine} = 1;
}
if ($datafree > 0) {
$fragtables++;
}
}
}
while (my ($engine,$size) = each(%enginestats)) {
infoprint "Data in $engine tables: ".hr_bytes_rnd($size)." (Tables: ".$enginecount{$engine}.")"."\n";
}
# If the storage engine isn't being used, recommend it to be disabled
if (!defined $enginestats{'InnoDB'} && defined $myvar{'have_innodb'} && $myvar{'have_innodb'} eq "YES") {
badprint "InnoDB is enabled but isn't being used\n";
push(@generalrec,"Add skip-innodb to MySQL configuration to disable InnoDB");
}
if (!defined $enginestats{'BerkeleyDB'} && defined $myvar{'have_bdb'} && $myvar{'have_bdb'} eq "YES") {
badprint "BDB is enabled but isn't being used\n";
push(@generalrec,"Add skip-bdb to MySQL configuration to disable BDB");
}
if (!defined $enginestats{'ISAM'} && defined $myvar{'have_isam'} && $myvar{'have_isam'} eq "YES") {
badprint "ISAM is enabled but isn't being used\n";
push(@generalrec,"Add skip-isam to MySQL configuration to disable ISAM (MySQL > 4.1.0)");
}
# Fragmented tables
if ($fragtables > 0) {
badprint "Total fragmented tables: $fragtables\n";
push(@generalrec,"Run OPTIMIZE TABLE to defragment tables for better performance");
} else {
goodprint "Total fragmented tables: $fragtables\n";
}
}
my %mycalc;
sub calculations {
if ($mystat{'Questions'} < 1) {
badprint "Your server has not answered any queries - cannot continue...";
exit 0;
}
# Per-thread memory
if ($mysqlvermajor > 3) {
$mycalc{'per_thread_buffers'} = $myvar{'read_buffer_size'} + $myvar{'read_rnd_buffer_size'} + $myvar{'sort_buffer_size'} + $myvar{'thread_stack'} + $myvar{'join_buffer_size'};
} else {
$mycalc{'per_thread_buffers'} = $myvar{'record_buffer'} + $myvar{'record_rnd_buffer'} + $myvar{'sort_buffer'} + $myvar{'thread_stack'} + $myvar{'join_buffer_size'};
}
$mycalc{'total_per_thread_buffers'} = $mycalc{'per_thread_buffers'} * $myvar{'max_connections'};
$mycalc{'max_total_per_thread_buffers'} = $mycalc{'per_thread_buffers'} * $mystat{'Max_used_connections'};
# Server-wide memory
$mycalc{'max_tmp_table_size'} = ($myvar{'tmp_table_size'} > $myvar{'max_heap_table_size'}) ? $myvar{'max_heap_table_size'} : $myvar{'tmp_table_size'} ;
$mycalc{'server_buffers'} = $myvar{'key_buffer_size'} + $mycalc{'max_tmp_table_size'};
$mycalc{'server_buffers'} += (defined $myvar{'innodb_buffer_pool_size'}) ? $myvar{'innodb_buffer_pool_size'} : 0 ;
$mycalc{'server_buffers'} += (defined $myvar{'innodb_additional_mem_pool_size'}) ? $myvar{'innodb_additional_mem_pool_size'} : 0 ;
$mycalc{'server_buffers'} += (defined $myvar{'innodb_log_buffer_size'}) ? $myvar{'innodb_log_buffer_size'} : 0 ;
$mycalc{'server_buffers'} += (defined $myvar{'query_cache_size'}) ? $myvar{'query_cache_size'} : 0 ;
# Global memory
$mycalc{'max_used_memory'} = $mycalc{'server_buffers'} + $mycalc{"max_total_per_thread_buffers"};
$mycalc{'total_possible_used_memory'} = $mycalc{'server_buffers'} + $mycalc{'total_per_thread_buffers'};
$mycalc{'pct_physical_memory'} = int(($mycalc{'total_possible_used_memory'} * 100) / $physical_memory);
# Slow queries
$mycalc{'pct_slow_queries'} = int(($mystat{'Slow_queries'}/$mystat{'Questions'}) * 100);
# Connections
$mycalc{'pct_connections_used'} = int(($mystat{'Max_used_connections'}/$myvar{'max_connections'}) * 100);
$mycalc{'pct_connections_used'} = ($mycalc{'pct_connections_used'} > 100) ? 100 : $mycalc{'pct_connections_used'} ;
# Key buffers
if ($mysqlvermajor > 3 && !($mysqlvermajor == 4 && $mysqlverminor == 0)) {
$mycalc{'pct_key_buffer_used'} = sprintf("%.1f",(1 - (($mystat{'Key_blocks_unused'} * $myvar{'key_cache_block_size'}) / $myvar{'key_buffer_size'})) * 100);
}
if ($mystat{'Key_read_requests'} > 0) {
$mycalc{'pct_keys_from_mem'} = sprintf("%.1f",(100 - (($mystat{'Key_reads'} / $mystat{'Key_read_requests'}) * 100)));
}
if ($doremote eq 0 and $mysqlvermajor < 5) {
$mycalc{'total_myisam_indexes'} = `find $myvar{'datadir'} -name '*.MYI' 2>&1 | xargs du -L $duflags '{}' 2>&1 | awk '{ s += \$1 } END { printf (\"%d\",s) }'`;
} elsif ($mysqlvermajor >= 5) {
$mycalc{'total_myisam_indexes'} = `mysql $mysqllogin -Bse "SELECT IFNULL(SUM(INDEX_LENGTH),0) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema');"`;
}
if (defined $mycalc{'total_myisam_indexes'} and $mycalc{'total_myisam_indexes'} =~ /^0\n$/) {
$mycalc{'total_myisam_indexes'} = "fail";
} elsif (defined $mycalc{'total_myisam_indexes'}) {
chomp($mycalc{'total_myisam_indexes'});
}
# Query cache
if ($mysqlvermajor > 3) {
$mycalc{'query_cache_efficiency'} = sprintf("%.1f",($mystat{'Qcache_hits'} / ($mystat{'Com_select'} + $mystat{'Qcache_hits'})) * 100);
if ($myvar{'query_cache_size'}) {
$mycalc{'pct_query_cache_used'} = sprintf("%.1f",100 - ($mystat{'Qcache_free_memory'} / $myvar{'query_cache_size'}) * 100);
}
if ($mystat{'Qcache_lowmem_prunes'} == 0) {
$mycalc{'query_cache_prunes_per_day'} = 0;
} else {
$mycalc{'query_cache_prunes_per_day'} = int($mystat{'Qcache_lowmem_prunes'} / ($mystat{'Uptime'}/86400));
}
}
# Sorting
$mycalc{'total_sorts'} = $mystat{'Sort_scan'} + $mystat{'Sort_range'};
if ($mycalc{'total_sorts'} > 0) {
$mycalc{'pct_temp_sort_table'} = int(($mystat{'Sort_merge_passes'} / $mycalc{'total_sorts'}) * 100);
}
# Joins
$mycalc{'joins_without_indexes'} = $mystat{'Select_range_check'} + $mystat{'Select_full_join'};
$mycalc{'joins_without_indexes_per_day'} = int($mycalc{'joins_without_indexes'} / ($mystat{'Uptime'}/86400));
# Temporary tables
if ($mystat{'Created_tmp_tables'} > 0) {
if ($mystat{'Created_tmp_disk_tables'} > 0) {
$mycalc{'pct_temp_disk'} = int(($mystat{'Created_tmp_disk_tables'} / ($mystat{'Created_tmp_tables'} + $mystat{'Created_tmp_disk_tables'})) * 100);
} else {
$mycalc{'pct_temp_disk'} = 0;
}
}
# Table cache
if ($mystat{'Opened_tables'} > 0) {
$mycalc{'table_cache_hit_rate'} = int($mystat{'Open_tables'}*100/$mystat{'Opened_tables'});
} else {
$mycalc{'table_cache_hit_rate'} = 100;
}
# Open files
if ($myvar{'open_files_limit'} > 0) {
$mycalc{'pct_files_open'} = int($mystat{'Open_files'}*100/$myvar{'open_files_limit'});
}
# Table locks
if ($mystat{'Table_locks_immediate'} > 0) {
if ($mystat{'Table_locks_waited'} == 0) {
$mycalc{'pct_table_locks_immediate'} = 100;
} else {
$mycalc{'pct_table_locks_immediate'} = int($mystat{'Table_locks_immediate'}*100/($mystat{'Table_locks_waited'} + $mystat{'Table_locks_immediate'}));
}
}
# Thread cache
$mycalc{'thread_cache_hit_rate'} = int(100 - (($mystat{'Threads_created'} / $mystat{'Connections'}) * 100));
# Other
if ($mystat{'Connections'} > 0) {
$mycalc{'pct_aborted_connections'} = int(($mystat{'Aborted_connects'}/$mystat{'Connections'}) * 100);
}
if ($mystat{'Questions'} > 0) {
$mycalc{'total_reads'} = $mystat{'Com_select'};
$mycalc{'total_writes'} = $mystat{'Com_delete'} + $mystat{'Com_insert'} + $mystat{'Com_update'} + $mystat{'Com_replace'};
if ($mycalc{'total_reads'} == 0) {
$mycalc{'pct_reads'} = 0;
$mycalc{'pct_writes'} = 100;
} else {
$mycalc{'pct_reads'} = int(($mycalc{'total_reads'}/($mycalc{'total_reads'}+$mycalc{'total_writes'})) * 100);
$mycalc{'pct_writes'} = 100-$mycalc{'pct_reads'};
}
}
# InnoDB
if ($myvar{'have_innodb'} eq "YES") {
$mycalc{'innodb_log_size_pct'} = ($myvar{'innodb_log_file_size'} * 100 / $myvar{'innodb_buffer_pool_size'});
}
}
sub mysql_stats {
print "\n-------- Performance Metrics -------------------------------------------------\n";
# Show uptime, queries per second, connections, traffic stats
my $qps;
if ($mystat{'Uptime'} > 0) { $qps = sprintf("%.3f",$mystat{'Questions'}/$mystat{'Uptime'}); }
if ($mystat{'Uptime'} < 86400) { push(@generalrec,"MySQL started within last 24 hours - recommendations may be inaccurate"); }
infoprint "Up for: ".pretty_uptime($mystat{'Uptime'})." (".hr_num($mystat{'Questions'}).
" q [".hr_num($qps)." qps], ".hr_num($mystat{'Connections'})." conn,".
" TX: ".hr_num($mystat{'Bytes_sent'}).", RX: ".hr_num($mystat{'Bytes_received'}).")\n";
infoprint "Reads / Writes: ".$mycalc{'pct_reads'}."% / ".$mycalc{'pct_writes'}."%\n";
# Memory usage
infoprint "Total buffers: ".hr_bytes($mycalc{'server_buffers'})." global + ".hr_bytes($mycalc{'per_thread_buffers'})." per thread ($myvar{'max_connections'} max threads)\n";
if ($mycalc{'total_possible_used_memory'} > 2*1024*1024*1024 && $arch eq 32) {
badprint "Allocating > 2GB RAM on 32-bit systems can cause system instability\n";
badprint "Maximum possible memory usage: ".hr_bytes($mycalc{'total_possible_used_memory'})." ($mycalc{'pct_physical_memory'}% of installed RAM)\n";
} elsif ($mycalc{'pct_physical_memory'} > 85) {
badprint "Maximum possible memory usage: ".hr_bytes($mycalc{'total_possible_used_memory'})." ($mycalc{'pct_physical_memory'}% of installed RAM)\n";
push(@generalrec,"Reduce your overall MySQL memory footprint for system stability");
} else {
goodprint "Maximum possible memory usage: ".hr_bytes($mycalc{'total_possible_used_memory'})." ($mycalc{'pct_physical_memory'}% of installed RAM)\n";
}
# Slow queries
if ($mycalc{'pct_slow_queries'} > 5) {
badprint "Slow queries: $mycalc{'pct_slow_queries'}% (".hr_num($mystat{'Slow_queries'})."/".hr_num($mystat{'Questions'}).")\n";
} else {
goodprint "Slow queries: $mycalc{'pct_slow_queries'}% (".hr_num($mystat{'Slow_queries'})."/".hr_num($mystat{'Questions'}).")\n";
}
if ($myvar{'long_query_time'} > 10) { push(@adjvars,"long_query_time (<= 10)"); }
if (defined($myvar{'log_slow_queries'})) {
if ($myvar{'log_slow_queries'} eq "OFF") { push(@generalrec,"Enable the slow query log to troubleshoot bad queries"); }
}
# Connections
if ($mycalc{'pct_connections_used'} > 85) {
badprint "Highest connection usage: $mycalc{'pct_connections_used'}% ($mystat{'Max_used_connections'}/$myvar{'max_connections'})\n";
push(@adjvars,"max_connections (> ".$myvar{'max_connections'}.")");
push(@adjvars,"wait_timeout (< ".$myvar{'wait_timeout'}.")","interactive_timeout (< ".$myvar{'interactive_timeout'}.")");
push(@generalrec,"Reduce or eliminate persistent connections to reduce connection usage")
} else {
goodprint "Highest usage of available connections: $mycalc{'pct_connections_used'}% ($mystat{'Max_used_connections'}/$myvar{'max_connections'})\n";
}
# Key buffer
if (!defined($mycalc{'total_myisam_indexes'}) and $doremote eq 1) {
push(@generalrec,"Unable to calculate MyISAM indexes on remote MySQL server < 5.0.0");
} elsif ($mycalc{'total_myisam_indexes'} =~ /^fail$/) {
badprint "Cannot calculate MyISAM index size - re-run script as root user\n";
} elsif ($mycalc{'total_myisam_indexes'} == "0") {
badprint "None of your MyISAM tables are indexed - add indexes immediately\n";
} else {
if ($myvar{'key_buffer_size'} < $mycalc{'total_myisam_indexes'} && $mycalc{'pct_keys_from_mem'} < 95) {
badprint "Key buffer size / total MyISAM indexes: ".hr_bytes($myvar{'key_buffer_size'})."/".hr_bytes($mycalc{'total_myisam_indexes'})."\n";
push(@adjvars,"key_buffer_size (> ".hr_bytes($mycalc{'total_myisam_indexes'}).")");
} else {
goodprint "Key buffer size / total MyISAM indexes: ".hr_bytes($myvar{'key_buffer_size'})."/".hr_bytes($mycalc{'total_myisam_indexes'})."\n";
}
if ($mystat{'Key_read_requests'} > 0) {
if ($mycalc{'pct_keys_from_mem'} < 95) {
badprint "Key buffer hit rate: $mycalc{'pct_keys_from_mem'}% (".hr_num($mystat{'Key_read_requests'})." cached / ".hr_num($mystat{'Key_reads'})." reads)\n";
} else {
goodprint "Key buffer hit rate: $mycalc{'pct_keys_from_mem'}% (".hr_num($mystat{'Key_read_requests'})." cached / ".hr_num($mystat{'Key_reads'})." reads)\n";
}
} else {
# For the sake of space, we will be quiet here
# No queries have run that would use keys
}
}
# Query cache
if ($mysqlvermajor < 4) {
# For the sake of space, we will be quiet here
# MySQL versions < 4.01 don't support query caching
push(@generalrec,"Upgrade MySQL to version 4+ to utilize query caching");
} elsif ($myvar{'query_cache_size'} < 1) {
badprint "Query cache is disabled\n";
push(@adjvars,"query_cache_size (>= 8M)");
} elsif ($mystat{'Com_select'} == 0) {
badprint "Query cache cannot be analyzed - no SELECT statements executed\n";
} else {
if ($mycalc{'query_cache_efficiency'} < 20) {
badprint "Query cache efficiency: $mycalc{'query_cache_efficiency'}% (".hr_num($mystat{'Qcache_hits'})." cached / ".hr_num($mystat{'Qcache_hits'}+$mystat{'Com_select'})." selects)\n";
push(@adjvars,"query_cache_limit (> ".hr_bytes_rnd($myvar{'query_cache_limit'}).", or use smaller result sets)");
} else {
goodprint "Query cache efficiency: $mycalc{'query_cache_efficiency'}% (".hr_num($mystat{'Qcache_hits'})." cached / ".hr_num($mystat{'Qcache_hits'}+$mystat{'Com_select'})." selects)\n";
}
if ($mycalc{'query_cache_prunes_per_day'} > 98) {
badprint "Query cache prunes per day: $mycalc{'query_cache_prunes_per_day'}\n";
push(@adjvars,"query_cache_size (> ".hr_bytes_rnd($myvar{'query_cache_size'}).")")
} else {
goodprint "Query cache prunes per day: $mycalc{'query_cache_prunes_per_day'}\n";
}
}
# Sorting
if ($mycalc{'total_sorts'} == 0) {
# For the sake of space, we will be quiet here
# No sorts have run yet
} elsif ($mycalc{'pct_temp_sort_table'} > 10) {
badprint "Sorts requiring temporary tables: $mycalc{'pct_temp_sort_table'}% (".hr_num($mystat{'Sort_merge_passes'})." temp sorts / ".hr_num($mycalc{'total_sorts'})." sorts)\n";
push(@adjvars,"sort_buffer_size (> ".hr_bytes_rnd($myvar{'sort_buffer_size'}).")");
push(@adjvars,"read_rnd_buffer_size (> ".hr_bytes_rnd($myvar{'read_rnd_buffer_size'}).")");
} else {
goodprint "Sorts requiring temporary tables: $mycalc{'pct_temp_sort_table'}% (".hr_num($mystat{'Sort_merge_passes'})." temp sorts / ".hr_num($mycalc{'total_sorts'})." sorts)\n";
}
# Joins
if ($mycalc{'joins_without_indexes_per_day'} > 250) {
badprint "Joins performed without indexes: $mycalc{'joins_without_indexes'}\n";
push(@adjvars,"join_buffer_size (> ".hr_bytes($myvar{'join_buffer_size'}).", or always use indexes with joins)");
push(@generalrec,"Adjust your join queries to always utilize indexes");
} else {
# For the sake of space, we will be quiet here
# No joins have run without indexes
}
# Temporary tables
if ($mystat{'Created_tmp_tables'} > 0) {
if ($mycalc{'pct_temp_disk'} > 25 && $mycalc{'max_tmp_table_size'} < 256*1024*1024) {
badprint "Temporary tables created on disk: $mycalc{'pct_temp_disk'}% (".hr_num($mystat{'Created_tmp_disk_tables'})." on disk / ".hr_num($mystat{'Created_tmp_disk_tables'} + $mystat{'Created_tmp_tables'})." total)\n";
push(@adjvars,"tmp_table_size (> ".hr_bytes_rnd($myvar{'tmp_table_size'}).")");
push(@adjvars,"max_heap_table_size (> ".hr_bytes_rnd($myvar{'max_heap_table_size'}).")");
push(@generalrec,"When making adjustments, make tmp_table_size/max_heap_table_size equal");
push(@generalrec,"Reduce your SELECT DISTINCT queries without LIMIT clauses");
} elsif ($mycalc{'pct_temp_disk'} > 25 && $mycalc{'max_tmp_table_size'} >= 256) {
badprint "Temporary tables created on disk: $mycalc{'pct_temp_disk'}% (".hr_num($mystat{'Created_tmp_disk_tables'})." on disk / ".hr_num($mystat{'Created_tmp_disk_tables'} + $mystat{'Created_tmp_tables'})." total)\n";
push(@generalrec,"Temporary table size is already large - reduce result set size");
push(@generalrec,"Reduce your SELECT DISTINCT queries without LIMIT clauses");
} else {
goodprint "Temporary tables created on disk: $mycalc{'pct_temp_disk'}% (".hr_num($mystat{'Created_tmp_disk_tables'})." on disk / ".hr_num($mystat{'Created_tmp_disk_tables'} + $mystat{'Created_tmp_tables'})." total)\n";
}
} else {
# For the sake of space, we will be quiet here
# No temporary tables have been created
}
# Thread cache
if ($myvar{'thread_cache_size'} eq 0) {
badprint "Thread cache is disabled\n";
push(@generalrec,"Set thread_cache_size to 4 as a starting value");
push(@adjvars,"thread_cache_size (start at 4)");
} else {
if ($mycalc{'thread_cache_hit_rate'} <= 50) {
badprint "Thread cache hit rate: $mycalc{'thread_cache_hit_rate'}% (".hr_num($mystat{'Threads_created'})." created / ".hr_num($mystat{'Connections'})." connections)\n";
push(@adjvars,"thread_cache_size (> $myvar{'thread_cache_size'})");
} else {
goodprint "Thread cache hit rate: $mycalc{'thread_cache_hit_rate'}% (".hr_num($mystat{'Threads_created'})." created / ".hr_num($mystat{'Connections'})." connections)\n";
}
}
# Table cache
if ($mystat{'Open_tables'} > 0) {
if ($mycalc{'table_cache_hit_rate'} < 20) {
badprint "Table cache hit rate: $mycalc{'table_cache_hit_rate'}% (".hr_num($mystat{'Open_tables'})." open / ".hr_num($mystat{'Opened_tables'})." opened)\n";
if ($mysqlvermajor eq 6 || ($mysqlvermajor eq 5 && $mysqlverminor ge 1)) {
push(@adjvars,"table_cache (> ".$myvar{'table_open_cache'}.")");
} else {
push(@adjvars,"table_cache (> ".$myvar{'table_cache'}.")");
}
push(@generalrec,"Increase table_cache gradually to avoid file descriptor limits");
} else {
goodprint "Table cache hit rate: $mycalc{'table_cache_hit_rate'}% (".hr_num($mystat{'Open_tables'})." open / ".hr_num($mystat{'Opened_tables'})." opened)\n";
}
}
# Open files
if (defined $mycalc{'pct_files_open'}) {
if ($mycalc{'pct_files_open'} > 85) {
badprint "Open file limit used: $mycalc{'pct_files_open'}% (".hr_num($mystat{'Open_files'})."/".hr_num($myvar{'open_files_limit'}).")\n";
push(@adjvars,"open_files_limit (> ".$myvar{'open_files_limit'}.")");
} else {
goodprint "Open file limit used: $mycalc{'pct_files_open'}% (".hr_num($mystat{'Open_files'})."/".hr_num($myvar{'open_files_limit'}).")\n";
}
}
# Table locks
if (defined $mycalc{'pct_table_locks_immediate'}) {
if ($mycalc{'pct_table_locks_immediate'} < 95) {
badprint "Table locks acquired immediately: $mycalc{'pct_table_locks_immediate'}%\n";
push(@generalrec,"Optimize queries and/or use InnoDB to reduce lock wait");
} else {
goodprint "Table locks acquired immediately: $mycalc{'pct_table_locks_immediate'}% (".hr_num($mystat{'Table_locks_immediate'})." immediate / ".hr_num($mystat{'Table_locks_waited'}+$mystat{'Table_locks_immediate'})." locks)\n";
}
}
# Performance options
if ($mysqlvermajor == 3 || ($mysqlvermajor == 4 && $mysqlverminor == 0)) {
push(@generalrec,"Upgrade to MySQL 4.1+ to use concurrent MyISAM inserts");
} elsif ($myvar{'concurrent_insert'} eq "OFF") {
push(@generalrec,"Enable concurrent_insert by setting it to 'ON'");
} elsif ($myvar{'concurrent_insert'} eq 0) {
push(@generalrec,"Enable concurrent_insert by setting it to 1");
}
if ($mycalc{'pct_aborted_connections'} > 5) {
badprint "Connections aborted: ".$mycalc{'pct_aborted_connections'}."%\n";
push(@generalrec,"Your applications are not closing MySQL connections properly");
}
# InnoDB
if (defined $myvar{'have_innodb'} && $myvar{'have_innodb'} eq "YES" && defined $enginestats{'InnoDB'}) {
if ($myvar{'innodb_buffer_pool_size'} > $enginestats{'InnoDB'}) {
goodprint "InnoDB data size / buffer pool: ".hr_bytes($enginestats{'InnoDB'})."/".hr_bytes($myvar{'innodb_buffer_pool_size'})."\n";
} else {
badprint "InnoDB data size / buffer pool: ".hr_bytes($enginestats{'InnoDB'})."/".hr_bytes($myvar{'innodb_buffer_pool_size'})."\n";
push(@adjvars,"innodb_buffer_pool_size (>= ".hr_bytes_rnd($enginestats{'InnoDB'}).")");
}
}
}
# Take the two recommendation arrays and display them at the end of the output
sub make_recommendations {
print "\n-------- Recommendations -----------------------------------------------------\n";
if (@generalrec > 0) {
print "General recommendations:\n";
foreach (@generalrec) { print " ".$_."\n"; }
}
if (@adjvars > 0) {
print "Variables to adjust:\n";
if ($mycalc{'pct_physical_memory'} > 90) {
print " *** MySQL's maximum memory usage is dangerously high ***\n".
" *** Add RAM before increasing MySQL buffer variables ***\n";
}
foreach (@adjvars) { print " ".$_."\n"; }
}
if (@generalrec == 0 && @adjvars ==0) {
print "No additional performance recommendations are available.\n"
}
print "\n";
}
# ---------------------------------------------------------------------------
# BEGIN 'MAIN'
# ---------------------------------------------------------------------------
print "\n >> MySQLTuner $tunerversion - Major Hayden <major\@mhtx.net>\n".
" >> Bug reports, feature requests, and downloads at http://mysqltuner.com/\n".
" >> Run with '--help' for additional options and output filtering\n";
mysql_setup; # Gotta login first
os_setup; # Set up some OS variables
get_all_vars; # Toss variables/status into hashes
validate_tuner_version; # Check current MySQLTuner version
validate_mysql_version; # Check current MySQL version
check_architecture; # Suggest 64-bit upgrade
check_storage_engines; # Show enabled storage engines
calculations; # Calculate everything we need
mysql_stats; # Print the server stats
make_recommendations; # Make recommendations based on stats
# ---------------------------------------------------------------------------
# END 'MAIN'
# ---------------------------------------------------------------------------