719 lines
36 KiB
PHP
719 lines
36 KiB
PHP
<?php
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declare(strict_types=1);
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return [
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// Queries
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[
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'id' => 'Uptime below one day',
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'name' => __('Uptime below one day'),
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'formula' => 'Uptime',
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'test' => 'value < 86400',
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'issue' => __('Uptime is less than 1 day, performance tuning may not be accurate.'),
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'recommendation' => __(
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'To have more accurate averages it is recommended to let the server run for'
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. ' longer than a day before running this analyzer'
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),
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'justification' => __('The uptime is only %s'),
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'justification_formula' => 'ADVISOR_timespanFormat(Uptime)',
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],
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[
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'id' => 'Questions below 1,000',
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'name' => __('Questions below 1,000'),
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'formula' => 'Questions',
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'test' => 'value < 1000',
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'issue' => __(
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'Fewer than 1,000 questions have been run against this server.'
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. ' The recommendations may not be accurate.'
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),
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'recommendation' => __(
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'Let the server run for a longer time until it has executed a greater amount of queries.'
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),
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'justification' => __('Current amount of Questions: %s'),
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'justification_formula' => 'Questions',
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],
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[
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'id' => 'Percentage of slow queries',
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'name' => __('Percentage of slow queries'),
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'precondition' => 'Questions > 0',
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'formula' => 'Slow_queries / Questions * 100',
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'test' => 'value >= 5',
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'issue' => __('There is a lot of slow queries compared to the overall amount of Queries.'),
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'recommendation' => __(
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'You might want to increase {long_query_time} or optimize the queries listed in the slow query log'
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),
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'justification' => __('The slow query rate should be below 5%%, your value is %s%%.'),
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'justification_formula' => 'round(value,2)',
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],
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[
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'id' => 'Slow query rate',
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'name' => __('Slow query rate'),
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'precondition' => 'Questions > 0',
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'formula' => '(Slow_queries / Questions * 100) / Uptime',
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'test' => 'value * 60 * 60 > 1',
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'issue' => __('There is a high percentage of slow queries compared to the server uptime.'),
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'recommendation' => __(
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'You might want to increase {long_query_time} or optimize the queries listed in the slow query log'
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),
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'justification' => __('You have a slow query rate of %s per hour, you should have less than 1%% per hour.'),
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'justification_formula' => 'ADVISOR_bytime(value,2)',
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],
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[
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'id' => 'Long query time',
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'name' => __('Long query time'),
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'formula' => 'long_query_time',
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'test' => 'value >= 10',
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'issue' => __(
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'{long_query_time} is set to 10 seconds or more,'
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. ' thus only slow queries that take above 10 seconds are logged.'
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),
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'recommendation' => __(
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'It is suggested to set {long_query_time} to a lower value, depending on your environment.'
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. ' Usually a value of 1-5 seconds is suggested.'
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),
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'justification' => __('long_query_time is currently set to %ds.'),
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'justification_formula' => 'value',
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],
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[
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'id' => 'Slow query logging',
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'name' => __('Slow query logging'),
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'precondition' => 'PMA_MYSQL_INT_VERSION < 50600',
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'formula' => 'log_slow_queries',
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'test' => 'value == \'OFF\'',
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'issue' => __('The slow query log is disabled.'),
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'recommendation' => __(
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'Enable slow query logging by setting {log_slow_queries} to \'ON\'.'
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. ' This will help troubleshooting badly performing queries.'
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),
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'justification' => __('log_slow_queries is set to \'OFF\''),
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],
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[
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'id' => 'Slow query logging',
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'name' => __('Slow query logging'),
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'precondition' => 'PMA_MYSQL_INT_VERSION >= 50600',
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'formula' => 'slow_query_log',
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'test' => 'value == \'OFF\'',
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'issue' => __('The slow query log is disabled.'),
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'recommendation' => __(
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'Enable slow query logging by setting {slow_query_log} to \'ON\'.'
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. ' This will help troubleshooting badly performing queries.'
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),
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'justification' => __('slow_query_log is set to \'OFF\''),
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],
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// Versions
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[
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'id' => 'Release Series',
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'name' => __('Release Series'),
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'formula' => 'version',
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'test' => 'substr(value,0,2) <= \'5.\' && substr(value,2,1) < 1',
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'issue' => __('The MySQL server version less than 5.1.'),
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'recommendation' => __(
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'You should upgrade, as MySQL 5.1 has improved performance, and MySQL 5.5 even more so.'
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),
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'justification' => __('Current version: %s'),
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'justification_formula' => 'value',
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],
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[
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'id' => 'Minor Version',
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'name' => __('Minor Version'),
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'precondition' => '! fired(\'Release Series\')',
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'formula' => 'version',
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'test' => 'substr(value,0,2) <= \'5.\' && substr(value,2,1) <= 1 && substr(value,4,2) < 30',
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'issue' => __('Version less than 5.1.30 (the first GA release of 5.1).'),
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'recommendation' => __(
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'You should upgrade, as recent versions of MySQL 5.1 have improved performance'
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. ' and MySQL 5.5 even more so.'
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),
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'justification' => __('Current version: %s'),
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'justification_formula' => 'value',
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],
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[
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'id' => 'Minor Version',
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'name' => __('Minor Version'),
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'precondition' => '! fired(\'Release Series\')',
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'formula' => 'version',
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'test' => 'substr(value,0,1) == 5 && substr(value,2,1) == 5 && substr(value,4,2) < 8',
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'issue' => __('Version less than 5.5.8 (the first GA release of 5.5).'),
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'recommendation' => __('You should upgrade, to a stable version of MySQL 5.5.'),
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'justification' => __('Current version: %s'),
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'justification_formula' => 'value',
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],
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[
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'id' => 'Distribution',
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'name' => __('Distribution'),
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'formula' => 'version_comment',
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'test' => 'preg_match(\'/source/i\',value)',
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'issue' => __('Version is compiled from source, not a MySQL official binary.'),
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'recommendation' => __(
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'If you did not compile from source, you may be using a package modified by a distribution.'
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. ' The MySQL manual only is accurate for official MySQL binaries,'
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. ' not any package distributions (such as RedHat, Debian/Ubuntu etc).'
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),
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'justification' => __('\'source\' found in version_comment'),
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],
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[
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'id' => 'Distribution',
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'name' => __('Distribution'),
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'formula' => 'version_comment',
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'test' => 'preg_match(\'/percona/i\',value)',
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'issue' => __('The MySQL manual only is accurate for official MySQL binaries.'),
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'recommendation' => __(
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'Percona documentation is at <a href="https://www.percona.com/software/documentation/">'
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. 'https://www.percona.com/software/documentation/</a>'
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),
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'justification' => __('\'percona\' found in version_comment'),
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],
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[
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'id' => 'MySQL Architecture',
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'name' => __('MySQL Architecture'),
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'formula' => 'system_memory',
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'test' => 'value > 3072*1024 && !preg_match(\'/64/\',version_compile_machine)'
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. ' && !preg_match(\'/64/\',version_compile_os)',
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'issue' => __('MySQL is not compiled as a 64-bit package.'),
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'recommendation' => __(
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'Your memory capacity is above 3 GiB (assuming the Server is on localhost),'
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. ' so MySQL might not be able to access all of your memory.'
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. ' You might want to consider installing the 64-bit version of MySQL.'
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),
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'justification' => __('Available memory on this host: %s'),
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'justification_formula' => 'ADVISOR_formatByteDown(value*1024, 2, 2)',
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],
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// Query cache
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[
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'id' => 'Query caching method',
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'name' => __('Query caching method'),
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'precondition' => '!fired(\'Query cache disabled\')',
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'formula' => 'Questions / Uptime',
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'test' => 'value > 100',
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'issue' => __('Suboptimal caching method.'),
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'recommendation' => __(
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'You are using the MySQL Query cache with a fairly high traffic database.'
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. ' It might be worth considering to use '
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. '<a href="https://dev.mysql.com/doc/refman/5.6/en/ha-memcached.html">memcached</a>'
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. ' instead of the MySQL Query cache, especially if you have multiple replicas.'
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),
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'justification' => __(
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'The query cache is enabled and the server receives %d queries per second.'
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. ' This rule fires if there is more than 100 queries per second.'
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),
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'justification_formula' => 'round(value,1)',
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],
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// Sorts
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[
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'id' => 'Percentage of sorts that cause temporary tables',
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'name' => __('Percentage of sorts that cause temporary tables'),
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'precondition' => 'Sort_scan + Sort_range > 0',
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'formula' => 'Sort_merge_passes / (Sort_scan + Sort_range) * 100',
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'test' => 'value > 10',
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'issue' => __('Too many sorts are causing temporary tables.'),
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'recommendation' => __(
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'Consider increasing {sort_buffer_size} and/or {read_rnd_buffer_size},'
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. ' depending on your system memory limits.'
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),
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'justification' => __('%s%% of all sorts cause temporary tables, this value should be lower than 10%%.'),
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'justification_formula' => 'round(value,1)',
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],
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[
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'id' => 'Rate of sorts that cause temporary tables',
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'name' => __('Rate of sorts that cause temporary tables'),
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'formula' => 'Sort_merge_passes / Uptime',
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'test' => 'value * 60 * 60 > 1',
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'issue' => __('Too many sorts are causing temporary tables.'),
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'recommendation' => __(
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'Consider increasing {sort_buffer_size} and/or {read_rnd_buffer_size},'
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. ' depending on your system memory limits.'
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),
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'justification' => __('Temporary tables average: %s, this value should be less than 1 per hour.'),
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'justification_formula' => 'ADVISOR_bytime(value,2)',
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],
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[
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'id' => 'Sort rows',
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'name' => __('Sort rows'),
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'formula' => 'Sort_rows / Uptime',
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'test' => 'value * 60 >= 1',
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'issue' => __('There are lots of rows being sorted.'),
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'recommendation' => __(
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'While there is nothing wrong with a high amount of row sorting, you might want to'
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. ' make sure that the queries which require a lot of sorting use indexed columns in'
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. ' the ORDER BY clause, as this will result in much faster sorting.'
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),
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'justification' => __('Sorted rows average: %s'),
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'justification_formula' => 'ADVISOR_bytime(value,2)',
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],
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// Joins, scans
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[
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'id' => 'Rate of joins without indexes',
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'name' => __('Rate of joins without indexes'),
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'formula' => '(Select_range_check + Select_scan + Select_full_join) / Uptime',
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'test' => 'value * 60 * 60 > 1',
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'issue' => __('There are too many joins without indexes.'),
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'recommendation' => __(
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'This means that joins are doing full table scans. Adding indexes for the columns being'
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. ' used in the join conditions will greatly speed up table joins.'
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),
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'justification' => __('Table joins average: %s, this value should be less than 1 per hour'),
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'justification_formula' => 'ADVISOR_bytime(value,2)',
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],
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[
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'id' => 'Rate of reading first index entry',
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'name' => __('Rate of reading first index entry'),
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'formula' => 'Handler_read_first / Uptime',
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'test' => 'value * 60 * 60 > 1',
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'issue' => __('The rate of reading the first index entry is high.'),
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'recommendation' => __(
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'This usually indicates frequent full index scans. Full index scans are faster than'
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. ' table scans but require lots of CPU cycles in big tables, if those tables that have or'
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. ' had high volumes of UPDATEs and DELETEs, running \'OPTIMIZE TABLE\' might reduce the'
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. ' amount of and/or speed up full index scans. Other than that full index scans can'
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. ' only be reduced by rewriting queries.'
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),
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'justification' => __('Index scans average: %s, this value should be less than 1 per hour'),
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'justification_formula' => 'ADVISOR_bytime(value,2)',
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],
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[
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'id' => 'Rate of reading fixed position',
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'name' => __('Rate of reading fixed position'),
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'formula' => 'Handler_read_rnd / Uptime',
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'test' => 'value * 60 * 60 > 1',
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'issue' => __('The rate of reading data from a fixed position is high.'),
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'recommendation' => __(
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'This indicates that many queries need to sort results and/or do a full table scan,'
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. ' including join queries that do not use indexes. Add indexes where applicable.'
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),
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'justification' => __('Rate of reading fixed position average: %s, this value should be less than 1 per hour'),
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'justification_formula' => 'ADVISOR_bytime(value,2)',
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],
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[
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'id' => 'Rate of reading next table row',
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'name' => __('Rate of reading next table row'),
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'formula' => 'Handler_read_rnd_next / Uptime',
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'test' => 'value * 60 * 60 > 1',
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'issue' => __('The rate of reading the next table row is high.'),
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'recommendation' => __(
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'This indicates that many queries are doing full table scans. Add indexes where applicable.'
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),
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'justification' => __('Rate of reading next table row: %s, this value should be less than 1 per hour'),
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'justification_formula' => 'ADVISOR_bytime(value,2)',
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],
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// Temp tables
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[
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'id' => 'Different tmp_table_size and max_heap_table_size',
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'name' => __('Different tmp_table_size and max_heap_table_size'),
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'formula' => 'tmp_table_size - max_heap_table_size',
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'test' => 'value !=0',
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'issue' => __('{tmp_table_size} and {max_heap_table_size} are not the same.'),
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'recommendation' => __(
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'If you have deliberately changed one of either: The server uses the lower value of either'
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. ' to determine the maximum size of in-memory tables. So if you wish to increase the'
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. ' in-memory table limit you will have to increase the other value as well.'
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),
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'justification' => __('Current values are tmp_table_size: %s, max_heap_table_size: %s'),
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'justification_formula' => 'ADVISOR_formatByteDown(tmp_table_size, 2, 2),'
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. ' ADVISOR_formatByteDown(max_heap_table_size, 2, 2)',
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],
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[
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'id' => 'Percentage of temp tables on disk',
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'name' => __('Percentage of temp tables on disk'),
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'precondition' => 'Created_tmp_tables + Created_tmp_disk_tables > 0',
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'formula' => 'Created_tmp_disk_tables / (Created_tmp_tables + Created_tmp_disk_tables) * 100',
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'test' => 'value > 25',
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'issue' => __('Many temporary tables are being written to disk instead of being kept in memory.'),
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'recommendation' => __(
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'Increasing {max_heap_table_size} and {tmp_table_size} might help. However some'
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. ' temporary tables are always being written to disk, independent of the value of these variables.'
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. ' To eliminate these you will have to rewrite your queries to avoid those conditions'
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. ' (Within a temporary table: Presence of a BLOB or TEXT column or presence of a column'
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. ' bigger than 512 bytes) as mentioned in the beginning of an <a href="'
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. 'https://www.facebook.com/note.php?note_id=10150111255065841&comments'
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. '">Article by the Pythian Group</a>'
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),
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'justification' => __(
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'%s%% of all temporary tables are being written to disk, this value should be below 25%%'
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),
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'justification_formula' => 'round(value,1)',
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],
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[
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'id' => 'Temp disk rate',
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'name' => __('Temp disk rate'),
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'precondition' => '!fired(\'Percentage of temp tables on disk\')',
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'formula' => 'Created_tmp_disk_tables / Uptime',
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'test' => 'value * 60 * 60 > 1',
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'issue' => __('Many temporary tables are being written to disk instead of being kept in memory.'),
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'recommendation' => __(
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'Increasing {max_heap_table_size} and {tmp_table_size} might help. However some'
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. ' temporary tables are always being written to disk, independent of the value of these variables.'
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. ' To eliminate these you will have to rewrite your queries to avoid those conditions'
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. ' (Within a temporary table: Presence of a BLOB or TEXT column or presence of a column'
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. ' bigger than 512 bytes) as mentioned in the <a href="'
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. 'https://dev.mysql.com/doc/refman/8.0/en/internal-temporary-tables.html'
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. '">MySQL Documentation</a>'
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),
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'justification' => __(
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'Rate of temporary tables being written to disk: %s, this value should be less than 1 per hour'
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),
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'justification_formula' => 'ADVISOR_bytime(value,2)',
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],
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// MyISAM index cache
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[
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'id' => 'MyISAM key buffer size',
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'name' => __('MyISAM key buffer size'),
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'formula' => 'key_buffer_size',
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'test' => 'value == 0',
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'issue' => __('Key buffer is not initialized. No MyISAM indexes will be cached.'),
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'recommendation' => __(
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'Set {key_buffer_size} depending on the size of your MyISAM indexes. 64M is a good start.'
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),
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'justification' => __('key_buffer_size is 0'),
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],
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[
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'id' => 'Max % MyISAM key buffer ever used',
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/* xgettext:no-php-format */
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'name' => __('Max % MyISAM key buffer ever used'),
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'precondition' => 'key_buffer_size > 0',
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'formula' => 'Key_blocks_used * key_cache_block_size / key_buffer_size * 100',
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'test' => 'value < 95',
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/* xgettext:no-php-format */
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'issue' => __('MyISAM key buffer (index cache) % used is low.'),
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'recommendation' => __(
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|
'You may need to decrease the size of {key_buffer_size}, re-examine your tables to see'
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. ' if indexes have been removed, or examine queries and expectations'
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. ' about what indexes are being used.'
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),
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'justification' => __('max %% MyISAM key buffer ever used: %s%%, this value should be above 95%%'),
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'justification_formula' => 'round(value,1)',
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],
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[
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'id' => 'Percentage of MyISAM key buffer used',
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'name' => __('Percentage of MyISAM key buffer used'),
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// Don't fire if above rule fired - we don't need the same advice twice
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'precondition' => 'key_buffer_size > 0 && !fired(\'Max % MyISAM key buffer ever used\')',
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'formula' => '( 1 - Key_blocks_unused * key_cache_block_size / key_buffer_size) * 100',
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'test' => 'value < 95',
|
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/* xgettext:no-php-format */
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'issue' => __('MyISAM key buffer (index cache) % used is low.'),
|
|
'recommendation' => __(
|
|
'You may need to decrease the size of {key_buffer_size}, re-examine your tables to see'
|
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. ' if indexes have been removed, or examine queries and expectations'
|
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. ' about what indexes are being used.'
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),
|
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'justification' => __('%% MyISAM key buffer used: %s%%, this value should be above 95%%'),
|
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'justification_formula' => 'round(value,1)',
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],
|
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[
|
|
'id' => 'Percentage of index reads from memory',
|
|
'name' => __('Percentage of index reads from memory'),
|
|
'precondition' => 'Key_read_requests > 0',
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'formula' => '100 - (Key_reads / Key_read_requests * 100)',
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|
'test' => 'value < 95',
|
|
/* xgettext:no-php-format */
|
|
'issue' => __('The % of indexes that use the MyISAM key buffer is low.'),
|
|
'recommendation' => __('You may need to increase {key_buffer_size}.'),
|
|
'justification' => __('Index reads from memory: %s%%, this value should be above 95%%'),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
// Other caches
|
|
[
|
|
'id' => 'Rate of table open',
|
|
'name' => __('Rate of table open'),
|
|
'formula' => 'Opened_tables / Uptime',
|
|
'test' => 'value*60*60 > 10',
|
|
'issue' => __('The rate of opening tables is high.'),
|
|
'recommendation' => __(
|
|
'Opening tables requires disk I/O which is costly. Increasing {table_open_cache} might avoid this.'
|
|
),
|
|
'justification' => __('Opened table rate: %s, this value should be less than 10 per hour'),
|
|
'justification_formula' => 'ADVISOR_bytime(value,2)',
|
|
],
|
|
[
|
|
'id' => 'Percentage of used open files limit',
|
|
'name' => __('Percentage of used open files limit'),
|
|
'formula' => 'Open_files / open_files_limit * 100',
|
|
'test' => 'value > 85',
|
|
'issue' => __(
|
|
'The number of open files is approaching the max number of open files.'
|
|
. ' You may get a "Too many open files" error.'
|
|
),
|
|
'recommendation' => __(
|
|
'Consider increasing {open_files_limit}, and check the error log when'
|
|
. ' restarting after changing {open_files_limit}.'
|
|
),
|
|
'justification' => __('The number of opened files is at %s%% of the limit. It should be below 85%%'),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
[
|
|
'id' => 'Rate of open files',
|
|
'name' => __('Rate of open files'),
|
|
'formula' => 'Open_files / Uptime',
|
|
'test' => 'value * 60 * 60 > 5',
|
|
'issue' => __('The rate of opening files is high.'),
|
|
'recommendation' => __(
|
|
'Consider increasing {open_files_limit}, and check the error log when'
|
|
. ' restarting after changing {open_files_limit}.'
|
|
),
|
|
'justification' => __('Opened files rate: %s, this value should be less than 5 per hour'),
|
|
'justification_formula' => 'ADVISOR_bytime(value,2)',
|
|
],
|
|
[
|
|
'id' => 'Immediate table locks %',
|
|
/* xgettext:no-php-format */
|
|
'name' => __('Immediate table locks %'),
|
|
'precondition' => 'Table_locks_waited + Table_locks_immediate > 0',
|
|
'formula' => 'Table_locks_immediate / (Table_locks_waited + Table_locks_immediate) * 100',
|
|
'test' => 'value < 95',
|
|
'issue' => __('Too many table locks were not granted immediately.'),
|
|
'recommendation' => __('Optimize queries and/or use InnoDB to reduce lock wait.'),
|
|
'justification' => __('Immediate table locks: %s%%, this value should be above 95%%'),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
[
|
|
'id' => 'Table lock wait rate',
|
|
'name' => __('Table lock wait rate'),
|
|
'formula' => 'Table_locks_waited / Uptime',
|
|
'test' => 'value * 60 * 60 > 1',
|
|
'issue' => __('Too many table locks were not granted immediately.'),
|
|
'recommendation' => __('Optimize queries and/or use InnoDB to reduce lock wait.'),
|
|
'justification' => __('Table lock wait rate: %s, this value should be less than 1 per hour'),
|
|
'justification_formula' => 'ADVISOR_bytime(value,2)',
|
|
],
|
|
[
|
|
'id' => 'Thread cache',
|
|
'name' => __('Thread cache'),
|
|
'formula' => 'thread_cache_size',
|
|
'test' => 'value < 1',
|
|
'issue' => __('Thread cache is disabled, resulting in more overhead from new connections to MySQL.'),
|
|
'recommendation' => __('Enable the thread cache by setting {thread_cache_size} > 0.'),
|
|
'justification' => __('The thread cache is set to 0'),
|
|
],
|
|
[
|
|
'id' => 'Thread cache hit rate %',
|
|
/* xgettext:no-php-format */
|
|
'name' => __('Thread cache hit rate %'),
|
|
'precondition' => 'thread_cache_size > 0',
|
|
'formula' => '100 - Threads_created / Connections',
|
|
'test' => 'value < 80',
|
|
'issue' => __('Thread cache is not efficient.'),
|
|
'recommendation' => __('Increase {thread_cache_size}.'),
|
|
'justification' => __('Thread cache hitrate: %s%%, this value should be above 80%%'),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
[
|
|
'id' => 'Threads that are slow to launch',
|
|
'name' => __('Threads that are slow to launch'),
|
|
'precondition' => 'slow_launch_time > 0',
|
|
'formula' => 'Slow_launch_threads',
|
|
'test' => 'value > 0',
|
|
'issue' => __('There are too many threads that are slow to launch.'),
|
|
'recommendation' => __(
|
|
'This generally happens in case of general system overload as it is pretty simple'
|
|
. ' operations. You might want to monitor your system load carefully.'
|
|
),
|
|
'justification' => __('%s thread(s) took longer than %s seconds to start, it should be 0'),
|
|
'justification_formula' => 'value, slow_launch_time',
|
|
],
|
|
[
|
|
'id' => 'Slow launch time',
|
|
'name' => __('Slow launch time'),
|
|
'formula' => 'slow_launch_time',
|
|
'test' => 'value > 2',
|
|
'issue' => __('Slow_launch_time is above 2s.'),
|
|
'recommendation' => __(
|
|
'Set {slow_launch_time} to 1s or 2s to correctly count threads that are slow to launch.'
|
|
),
|
|
'justification' => __('slow_launch_time is set to %s'),
|
|
'justification_formula' => 'value',
|
|
],
|
|
// Connections
|
|
[
|
|
'id' => 'Percentage of used connections',
|
|
'name' => __('Percentage of used connections'),
|
|
'formula' => 'Max_used_connections / max_connections * 100',
|
|
'test' => 'value > 80',
|
|
'issue' => __('The maximum amount of used connections is getting close to the value of {max_connections}.'),
|
|
'recommendation' => __(
|
|
'Increase {max_connections}, or decrease {wait_timeout} so that connections that do not'
|
|
. ' close database handlers properly get killed sooner.'
|
|
. ' Make sure the code closes database handlers properly.'
|
|
),
|
|
'justification' => __('Max_used_connections is at %s%% of max_connections, it should be below 80%%'),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
[
|
|
'id' => 'Percentage of aborted connections',
|
|
'name' => __('Percentage of aborted connections'),
|
|
'formula' => 'Aborted_connects / Connections * 100',
|
|
'test' => 'value > 1',
|
|
'issue' => __('Too many connections are aborted.'),
|
|
'recommendation' => __(
|
|
'Connections are usually aborted when they cannot be authorized. <a href="'
|
|
. 'https://www.percona.com/blog/2008/08/23/how-to-track-down-the-source-of-aborted_connects/'
|
|
. '">This article</a> might help you track down the source.'
|
|
),
|
|
'justification' => __('%s%% of all connections are aborted. This value should be below 1%%'),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
[
|
|
'id' => 'Rate of aborted connections',
|
|
'name' => __('Rate of aborted connections'),
|
|
'formula' => 'Aborted_connects / Uptime',
|
|
'test' => 'value * 60 * 60 > 1',
|
|
'issue' => __('Too many connections are aborted.'),
|
|
'recommendation' => __(
|
|
'Connections are usually aborted when they cannot be authorized. <a href="'
|
|
. 'https://www.percona.com/blog/2008/08/23/how-to-track-down-the-source-of-aborted_connects/'
|
|
. '">This article</a> might help you track down the source.'
|
|
),
|
|
'justification' => __('Aborted connections rate is at %s, this value should be less than 1 per hour'),
|
|
'justification_formula' => 'ADVISOR_bytime(value,2)',
|
|
],
|
|
[
|
|
'id' => 'Percentage of aborted clients',
|
|
'name' => __('Percentage of aborted clients'),
|
|
'formula' => 'Aborted_clients / Connections * 100',
|
|
'test' => 'value > 2',
|
|
'issue' => __('Too many clients are aborted.'),
|
|
'recommendation' => __(
|
|
'Clients are usually aborted when they did not close their connection to MySQL properly.'
|
|
. ' This can be due to network issues or code not closing a database handler properly.'
|
|
. ' Check your network and code.'
|
|
),
|
|
'justification' => __('%s%% of all clients are aborted. This value should be below 2%%'),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
[
|
|
'id' => 'Rate of aborted clients',
|
|
'name' => __('Rate of aborted clients'),
|
|
'formula' => 'Aborted_clients / Uptime',
|
|
'test' => 'value * 60 * 60 > 1',
|
|
'issue' => __('Too many clients are aborted.'),
|
|
'recommendation' => __(
|
|
'Clients are usually aborted when they did not close their connection to MySQL properly.'
|
|
. ' This can be due to network issues or code not closing a database handler properly.'
|
|
. ' Check your network and code.'
|
|
),
|
|
'justification' => __('Aborted client rate is at %s, this value should be less than 1 per hour'),
|
|
'justification_formula' => 'ADVISOR_bytime(value,2)',
|
|
],
|
|
// InnoDB
|
|
[
|
|
'id' => 'Is InnoDB disabled?',
|
|
'name' => __('Is InnoDB disabled?'),
|
|
'precondition' => 'PMA_MYSQL_INT_VERSION < 50600',
|
|
'formula' => 'have_innodb',
|
|
'test' => 'value != "YES"',
|
|
'issue' => __('You do not have InnoDB enabled.'),
|
|
'recommendation' => __('InnoDB is usually the better choice for table engines.'),
|
|
'justification' => __('have_innodb is set to \'value\''),
|
|
],
|
|
[
|
|
'id' => 'InnoDB log size',
|
|
'name' => __('InnoDB log size'),
|
|
'precondition' => 'innodb_buffer_pool_size > 0 && ! (IS_MARIADB && PMA_MYSQL_INT_VERSION > 100500)',
|
|
'formula' => '(innodb_log_file_size * innodb_log_files_in_group)/ innodb_buffer_pool_size * 100',
|
|
'test' => 'value < 20 && innodb_log_file_size / (1024 * 1024) < 256',
|
|
'issue' => __('The InnoDB log file size is not an appropriate size, in relation to the InnoDB buffer pool.'),
|
|
'recommendation' => __(/* xgettext:no-php-format */
|
|
'Especially on a system with a lot of writes to InnoDB tables you should set'
|
|
. ' {innodb_log_file_size} to 25% of {innodb_buffer_pool_size}. However the bigger this value,'
|
|
. ' the longer the recovery time will be when database crashes, so this value should not be set'
|
|
. ' much higher than 256 MiB. Please note however that you cannot simply change the value of'
|
|
. ' this variable. You need to shutdown the server, remove the InnoDB log files, set the new'
|
|
. ' value in my.cnf, start the server, then check the error logs if everything went fine.'
|
|
. ' See also <a href="'
|
|
. 'https://mysqldatabaseadministration.blogspot.com/2007/01/increase-innodblogfilesize-proper-way.html'
|
|
. '">this blog entry</a>'
|
|
),
|
|
'justification' => __(
|
|
'Your InnoDB log size is at %s%% in relation to the InnoDB buffer pool size,'
|
|
. ' it should not be below 20%%'
|
|
),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
[
|
|
'id' => 'InnoDB log size',
|
|
'name' => __('InnoDB log size'),
|
|
'precondition' => 'innodb_buffer_pool_size > 0 && IS_MARIADB && PMA_MYSQL_INT_VERSION > 100500',
|
|
// From MariaDB 10.5, there is 1 redo log.
|
|
// For MariaDB 10.4 and before, the number of redo log files is configured
|
|
// by the innodb_log_files_in_group system variable.
|
|
'formula' => 'innodb_log_file_size / innodb_buffer_pool_size * 100',
|
|
'test' => 'value < 20 && innodb_log_file_size / (1024 * 1024) < 256',
|
|
'issue' => __('The InnoDB log file size is not an appropriate size, in relation to the InnoDB buffer pool.'),
|
|
'recommendation' => __(/* xgettext:no-php-format */
|
|
'Especially on a system with a lot of writes to InnoDB tables you should set'
|
|
. ' {innodb_log_file_size} to 25% of {innodb_buffer_pool_size}. However the bigger this value,'
|
|
. ' the longer the recovery time will be when database crashes, so this value should not be set'
|
|
. ' much higher than 256 MiB. Please note however that you cannot simply change the value of'
|
|
. ' this variable. You need to shutdown the server, remove the InnoDB log files, set the new'
|
|
. ' value in my.cnf, start the server, then check the error logs if everything went fine.'
|
|
. ' See also <a href="'
|
|
. 'https://mysqldatabaseadministration.blogspot.com/2007/01/increase-innodblogfilesize-proper-way.html'
|
|
. '">this blog entry</a>'
|
|
),
|
|
'justification' => __(
|
|
'Your InnoDB log size is at %s%% in relation to the InnoDB buffer pool size,'
|
|
. ' it should not be below 20%%'
|
|
),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
[
|
|
'id' => 'Max InnoDB log size',
|
|
'name' => __('Max InnoDB log size'),
|
|
'precondition' => 'innodb_buffer_pool_size > 0 && innodb_log_file_size / innodb_buffer_pool_size * 100 < 30',
|
|
'formula' => 'innodb_log_file_size / (1024 * 1024)',
|
|
'test' => 'value > 256',
|
|
'issue' => __('The InnoDB log file size is inadequately large.'),
|
|
'recommendation' => __(/* xgettext:no-php-format */
|
|
'It is usually sufficient to set {innodb_log_file_size} to 25% of the size of'
|
|
. ' {innodb_buffer_pool_size}. A very big {innodb_log_file_size} slows down the recovery'
|
|
. ' time after a database crash considerably. See also '
|
|
. '<a href="https://www.percona.com/blog/2006/07/03/choosing-proper-innodb_log_file_size/">'
|
|
. 'this Article</a>. You need to shutdown the server, remove the InnoDB log files, set the'
|
|
. ' new value in my.cnf, start the server, then check the error logs'
|
|
. ' if everything went fine. See also <a href="'
|
|
. 'https://mysqldatabaseadministration.blogspot.com/2007/01/increase-innodblogfilesize-proper-way.html'
|
|
. '">this blog entry</a>'
|
|
),
|
|
'justification' => __('Your absolute InnoDB log size is %s MiB'),
|
|
'justification_formula' => 'round(value,1)',
|
|
],
|
|
[
|
|
'id' => 'InnoDB buffer pool size',
|
|
'name' => __('InnoDB buffer pool size'),
|
|
'precondition' => 'system_memory > 0',
|
|
'formula' => 'innodb_buffer_pool_size / system_memory * 100',
|
|
'test' => 'value < 60',
|
|
'issue' => __('Your InnoDB buffer pool is fairly small.'),
|
|
'recommendation' => __(/* xgettext:no-php-format */
|
|
'The InnoDB buffer pool has a profound impact on performance for InnoDB tables.'
|
|
. ' Assign all your remaining memory to this buffer. For database servers that use solely InnoDB'
|
|
. ' as storage engine and have no other services (e.g. a web server) running, you may set this'
|
|
. ' as high as 80% of your available memory. If that is not the case, you need to carefully'
|
|
. ' assess the memory consumption of your other services and non-InnoDB-Tables and set this'
|
|
. ' variable accordingly. If it is set too high, your system will start swapping,'
|
|
. ' which decreases performance significantly. See also '
|
|
. '<a href="https://www.percona.com/blog/2007/11/03/choosing-innodb_buffer_pool_size/">this article</a>'
|
|
),
|
|
'justification' => __(
|
|
'You are currently using %s%% of your memory for the InnoDB buffer pool.'
|
|
. ' This rule fires if you are assigning less than 60%%, however this might be perfectly'
|
|
. ' adequate for your system if you don\'t have much InnoDB tables'
|
|
. ' or other services running on the same machine.'
|
|
),
|
|
'justification_formula' => 'value',
|
|
],
|
|
// Other
|
|
[
|
|
'id' => 'MyISAM concurrent inserts',
|
|
'name' => __('MyISAM concurrent inserts'),
|
|
'formula' => 'concurrent_insert',
|
|
'test' => 'value === 0 || value === \'NEVER\'',
|
|
'issue' => __('Enable {concurrent_insert} by setting it to 1'),
|
|
'recommendation' => __(
|
|
'Setting {concurrent_insert} to 1 reduces contention between'
|
|
. ' readers and writers for a given table. See also '
|
|
. '<a href="https://dev.mysql.com/doc/refman/5.5/en/concurrent-inserts.html">MySQL Documentation</a>'
|
|
),
|
|
'justification' => __('concurrent_insert is set to 0'),
|
|
],
|
|
];
|