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https://dev.mysql.com/doc/refman/8.0/en/system-schema.html
However, in most cases there are corresponding INFORMATION_SCHEMA tables that can be queried. It contains tables that store information required by the MySQL server as it runs. A broad categorization is that the mysql schema contains data dictionary ...
https://dev.mysql.com/doc/refman/8.0/en/debugging-server.html
This command also provides some useful information even if you have not compiled MySQL for debugging! If the problem is that some tables are getting slower and slower you should try to optimize the table with OPTIMIZE TABLE or myisamchk. If you are ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-event-fields.html
This ID indicates which part of the server produced the event, and is consistent with general query log and slow query log messages, which include the connection thread ID. Error events intended for the error log contain a set of fields, each of ...
https://dev.mysql.com/doc/refman/8.0/en/error-lost-connection.html
Sometimes the “during query” form happens when millions of rows are being sent as part of one or more queries. In this case, if your connect_timeout value is set to only a few seconds, you may be able to resolve the problem by increasing it to ...Usually it indicates network connectivity trouble and you should check the condition of your network if this error occurs ...
https://dev.mysql.com/doc/refman/8.0/en/insert-optimization.html
The size of the table slows down the insertion of indexes by log N, assuming B-tree indexes. To optimize insert speed, combine many small operations into a single large operation. Ideally, you make a single connection, send the data for many new ...
https://dev.mysql.com/doc/refman/8.0/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-examples.html
To begin, you should have a repeatable use case where performance is deemed “too slow” and needs optimization, and you should enable all instrumentation (no pre-filtering at all). The Performance Schema is a tool to help a DBA do performance ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-system-variables.html
Increasing the value of group_replication_member_expel_timeout can help to avoid unnecessary expulsions on slower or less stable networks, or in the case of expected transient network outages or machine slowdowns. The ... This section lists the ...
https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-optimization-tips.html
The resulting fast database operations are then available to be reused by other queries, applications, and even code written in different programming languages. To avoid slowing down the source while making backups, you can make backups using a ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-transaction-management.html
If a big transaction is slowing down server performance, rolling it back can make the problem worse, potentially taking several times as long to perform as the original data change operations. When a long-running transaction modifies a table, ... To ...