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* Added innodb_log_file_size checks

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* Added 32-bit/64-bit checks and warnings (maximum memory > 2GB = bad)
* Fixed temporary table recommendation bug (would never recommend increase)
* Fixed thread cache recommendations/warnings
* Merged increase/decrease variable recommendations into one category
This commit is contained in:
Major Hayden 2007-12-01 22:04:00 +00:00
parent 34b5cba861
commit bc69094412
1 changed files with 76 additions and 35 deletions
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111
mysqltuner.pl
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@ -180,7 +180,8 @@ sub mysql_setup {
}
my (%mystat,%myvar,$dummyselect);
sub get_all_vars {
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 $line (@mysqlvarlist) {
@ -205,6 +206,21 @@ sub validate_mysql_version {
goodprint "Currently running supported MySQL version ".$myvar{'version'}."\n";
}
}
my ($arch);
sub check_architecture {
if (`uname -m` =~ /64/) {
$arch = 64;
goodprint "Operating on 64-bit architecture\n";
} else {
$arch = 32;
if ($physical_memory > 2*1024*1024*1024) {
badprint "Switch to 64-bit OS - MySQL cannot currenty use all of your RAM\n";
} else {
goodprint "Operating on 32-bit architecture with less than 2GB RAM\n";
}
}
}
sub pretty_uptime {
my $uptime = shift;
@ -380,10 +396,16 @@ sub calculations {
$mycalc{'pct_reads'} = int(($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 / $myvar{'innodb_buffer_pool_size'});
}
}
my (@decvars, @incvars, @generalrec);
my (@adjvars, @generalrec);
sub mysql_stats {
print "-------- General Statistics --------------------------------------------------\n";
@ -398,8 +420,11 @@ sub mysql_stats {
# Memory usage
infoprint "Total buffers per thread: ".hr_bytes($mycalc{'per_thread_buffers'})."\n";
infoprint "Total global buffers: ".hr_bytes($mycalc{'server_buffers'})."\n";
if ($mycalc{'pct_physical_memory'} > 85) {
infoprint "Total global buffers: ".hr_bytes($mycalc{'server_buffers'})."\n";
if ($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 {
@ -412,7 +437,7 @@ sub mysql_stats {
} else {
goodprint "Slow queries: $mycalc{'pct_slow_queries'}%\n";
}
if ($myvar{'long_query_time'} > 10) { push(@decvars,"long_query_time (<= 10)"); }
if ($myvar{'long_query_time'} > 10) { push(@adjvars,"long_query_time (<= 10)"); }
if (defined($myvar{'log_slow_queries'})) {
if ($myvar{'log_slow_queries'} eq "OFF") { push(@generalrec,"Enable the slow query log to troubleshoot bad queries"); }
}
@ -420,8 +445,8 @@ sub mysql_stats {
# Connections
if ($mycalc{'pct_connections_used'} > 85) {
badprint "Highest connection usage: $mycalc{'pct_connections_used'}%\n";
push(@incvars,"max_connections (> ".$myvar{'max_connections'}.")");
push(@decvars,"wait_timeout (< ".$myvar{'wait_timeout'}.")","interactive_timeout (< ".$myvar{'interactive_timeout'}.")");
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: $mycalc{'pct_connections_used'}%\n";
@ -435,7 +460,7 @@ sub mysql_stats {
} else {
if ($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($mycalc{'total_myisam_indexes'})."\n";
push(@incvars,"key_buffer_size (> ".hr_bytes($mycalc{'total_myisam_indexes'}).")");
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($mycalc{'total_myisam_indexes'})."\n";
}
@ -458,19 +483,19 @@ sub mysql_stats {
push(@generalrec,"Upgrade MySQL to version 4+ to utilize query caching");
} elsif ($myvar{'query_cache_size'} < 1) {
badprint "Query cache is disabled\n";
push(@incvars,"query_cache_size (>= 8M)");
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'}%\n";
push(@incvars,"query_cache_limit (> 1M, or use smaller result sets)");
push(@adjvars,"query_cache_limit (> 1M, or use smaller result sets)");
} else {
goodprint "Query cache efficiency: $mycalc{'query_cache_efficiency'}%\n";
}
if ($mycalc{'query_cache_prunes_per_day'} > 98) {
badprint "Query cache prunes per day: $mycalc{'query_cache_prunes_per_day'}\n";
push(@incvars,"query_cache_size (> ".hr_bytes_rnd($myvar{'query_cache_size'}).")")
push(@adjvars,"query_cache_size (> ".hr_bytes_rnd($myvar{'query_cache_size'}).")")
} else {
goodprint "Query cache prunes per day: $mycalc{'query_cache_prunes_per_day'}\n";
}
@ -482,8 +507,8 @@ sub mysql_stats {
# No sorts have run yet
} elsif ($mycalc{'pct_temp_sort_table'} > 10) {
badprint "Sorts requiring temporary tables: $mycalc{'pct_temp_sort_table'}%\n";
push(@incvars,"sort_buffer_size (> ".hr_bytes_rnd($myvar{'sort_buffer_size'}).")");
push(@incvars,"read_rnd_buffer_size (> ".hr_bytes_rnd($myvar{'read_rnd_buffer_size'}).")");
push(@adjvars,"sort_buffer_size (> ".hr_bytes_rnd($myvar{'sort_buffer_size'}).")");
push(@adjvars,"read_rnd_buffer_size (> ".hr_bytes_rnd($myvar{'read_rnd_buffer_size'}).")");
} else {
goodprint "Sorts requiring temporary tables: $mycalc{'pct_temp_sort_table'}%\n";
}
@ -491,7 +516,7 @@ sub mysql_stats {
# Joins
if ($mycalc{'joins_without_indexes_per_day'} > 250) {
badprint "Joins performed without indexes: $mycalc{'joins_without_indexes'}\n";
push(@incvars,"join_buffer_size (> ".hr_bytes($myvar{'join_buffer_size'}).", or always use indexes with joins)");
push(@adjvars,"join_buffer_size (> ".hr_bytes($myvar{'join_buffer_size'}).", or always use indexes with joins)");
push(@generalrec,"Adjust your join queries to always utilize indexes");
} else {
# For the sake of space, we will be quiet here
@ -500,10 +525,10 @@ sub mysql_stats {
# Temporary tables
if ($mystat{'Created_tmp_tables'} > 0) {
if ($mycalc{'pct_temp_disk'} > 25 && $mycalc{'max_tmp_table_size'} < 256) {
if ($mycalc{'pct_temp_disk'} > 25 && $mycalc{'max_tmp_table_size'} < 256*1024*1024) {
badprint "Temporary tables created on disk: $mycalc{'pct_temp_disk'}%\n";
push(@incvars,"tmp_table_size (> ".hr_bytes_rnd($myvar{'tmp_table_size'}).")");
push(@incvars,"max_heap_table_size (> ".hr_bytes_rnd($myvar{'max_heap_table_size'}).")");
push(@adjvars,"tmp_table_size (> ".hr_bytes_rnd($myvar{'tmp_table_size'}).")");
push(@adjvars,"max_heap_table_size (> ".hr_bytes_rnd($myvar{'max_heap_table_size'}).")");
push(@generalrec,"Be sure that tmp_table_size/max_heap_table_size are equal");
push(@generalrec,"Reduce your SELECT DISTINCT queries without LIMIT clauses");
} elsif ($mycalc{'pct_temp_disk'} > 25 && $mycalc{'max_tmp_table_size'} >= 256) {
@ -518,18 +543,25 @@ sub mysql_stats {
# No temporary tables have been created
}
# Thread cache
if ($mycalc{'thread_cache_hit_rate'} <= 50) {
badprint "Thread cache hit rate: $mycalc{'thread_cache_hit_rate'}%\n";
} else {
goodprint "Thread cache hit rate: $mycalc{'thread_cache_hit_rate'}%\n";
}
# Thread cache
if ($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'}%\n";
push(@adjvars,"thread_cache_size (> $myvar{'thread_cache_size'})");
} else {
goodprint "Thread cache hit rate: $mycalc{'thread_cache_hit_rate'}%\n";
}
}
# Table cache
if ($mystat{'Open_tables'} > 0) {
if ($mycalc{'table_cache_hit_rate'} < 20) {
badprint "Table cache hit rate: $mycalc{'table_cache_hit_rate'}%\n";
push(@incvars,"table_cache (> ".$myvar{'table_cache'}.")");
push(@adjvars,"table_cache (> ".$myvar{'table_cache'}.")");
push(@generalrec,"Increase table_cache gradually to avoid file descriptor limits");
} else {
goodprint "Table cache hit rate: $mycalc{'table_cache_hit_rate'}%\n";
@ -540,7 +572,7 @@ sub mysql_stats {
if ($myvar{'open_files_limit'} > 0) {
if ($mycalc{'pct_files_open'} > 85) {
badprint "Open file limit used: $mycalc{'pct_files_open'}%\n";
push(@incvars,"open_files_limit (> ".$myvar{'open_files_limit'}.")");
push(@adjvars,"open_files_limit (> ".$myvar{'open_files_limit'}.")");
} else {
goodprint "Open file limit used: $mycalc{'pct_files_open'}%\n";
}
@ -567,7 +599,19 @@ sub mysql_stats {
if ($mycalc{'pct_aborted_connections'} > 5) {
badprint "Connections aborted: ".$mycalc{'pct_aborted_connections'}."%\n";
push(@generalrec,"Your applications are not closing MySQL connections properly");
}
}
# InnoDB
if ($myvar{'have_innodb'} eq "YES") {
if ($mycalc{'innodb_log_size_pct'} > 20 && $mycalc{'innodb_log_size_pct'} < 30) {
goodprint "InnoDB log size is ".hr_bytes($myvar{'innodb_log_file_size'})." ($mycalc{'innodb_log_size_pct'}% of InnoDB buffer pool)\n";
} else {
badprint "InnoDB log size is ".hr_bytes($myvar{'innodb_log_file_size'})." ($mycalc{'innodb_log_size_pct'}% of InnoDB buffer pool)\n";
push(@generalrec,"Set innodb_log_file_size to 25% of InnoDB buffer pool");
push(@adjvars,"innodb_log_file_size (".hr_bytes($myvar{'innodb_buffer_pool_size'}*.25).", which is 25% of InnoDB buffer pool)");
}
}
}
sub make_recommendations {
@ -576,17 +620,13 @@ sub make_recommendations {
print "General recommendations:\n";
foreach (@generalrec) { print " ".$_."\n"; }
}
if (@incvars > 0) {
print "Variables to increase:\n";
if (@adjvars > 0) {
print "Variables to adjust:\n";
if ($mycalc{'pct_physical_memory'} > 85) {
print " *** MySQL's maximum memory usage exceeds your installed memory ***\n".
" *** Add more RAM before increasing any MySQL buffer variables ***\n";
}
foreach (@incvars) { print " ".$_."\n"; }
}
if (@decvars > 0) {
print "Variables to decrease:\n";
foreach (@decvars) { print " ".$_."\n"; }
foreach (@adjvars) { print " ".$_."\n"; }
}
}
@ -599,7 +639,8 @@ print " MySQL High-Performance Tuning Script - Major Hayden <major\@mhtx.n
os_setup; # Set up some OS variables
mysql_setup; # Gotta login first
get_all_vars; # Toss variables/status into hashes
validate_mysql_version; # Check current MySQL version
validate_mysql_version; # Check current MySQL version
check_architecture; # Suggest 64-bit upgrade
calculations; # Calculate everything we need
mysql_stats; # Print the server stats
make_recommendations; # Make recommendations based on stats