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remove innodb_stats_on_metadata mentions in Readme
That flag is off by default, starting with MySQL 5.7, and the tool itself reports it in the "Performance Metrics" section.
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README.md

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@@ -171,16 +171,6 @@ Errors & solutions for performance schema installation
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ERROR at line 21: Failed to open file './tables/sys_config_data_10.sql -- ported', error: 2
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Have a look at #452 solution given by @ericx
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Performance tips
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Metadata statistic updates in MySQL 5.6 and lower can strongly impact performance of database servers.
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Be sure that innodb_stats_on_metadata is disabled.
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```bash
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set global innodb_stats_on_metadata = 0;
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```
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Fixing sysctl configuration (/etc/sysctl.conf)
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README.ru.md

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@@ -154,13 +154,6 @@ Sysschema не установлена по умолчанию на MariaDB 10.x.
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ERROR at line 21: Failed to open file './tables/sys_config_data_10.sql -- ported', error: 2
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Посмотрите на #452 решение, данное @ericx
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Советы по производительности
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Обновление статистики метадаты в версии MySQL 5.6 и ниже могут очень сильно влиять на производительность сервера баз данных и MySQLTuner.
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Убедитесь, что innodb_stats_on_metadata отключен.
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set global innodb_stats_on_metadata = 0;
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Примеры использования
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