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https://dev.mysql.com/doc/refman/8.0/en/optimization.html
Sometimes you can be proactive and plan in advance for performance, while other times you might troubleshoot a configuration or code issue after a problem occurs. This chapter explains how to optimize MySQL performance and provides examples.
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-applier-status-table.html
Thread-specific status information is available in the replication_applier_status_by_coordinator table (and replication_applier_status_by_worker if the replica is multithreaded). There is always a default replication channel, and more replication ...
https://dev.mysql.com/doc/refman/8.0/en/programs-development.html
In shell scripts, you can use the my_print_defaults program to parse option files and see what options would be used by a given program. This works well for programs that use the last instance of an option that is specified multiple times. If you ...
https://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html
For general instructions on setting parameters at startup or runtime, see Section 7.1.7, “Server Command Options”, and Section 7.1.8, “Server System Variables”. The MySQL server has many operating parameters, which you can change at server ...Note On Windows, the .ini or .cnf option file extension might not be ...
https://dev.mysql.com/doc/refman/8.0/en/show-binlog-events.html
Note Issuing a SHOW BINLOG EVENTS with no LIMIT clause could start a very time- and resource-consuming process because the server returns to the client the complete contents of the binary log (which includes all statements executed by the server ...
https://dev.mysql.com/doc/refman/8.0/en/show-relaylog-events.html
Note Issuing a SHOW RELAYLOG EVENTS with no LIMIT clause could start a very time- and resource-consuming process because the server returns to the client the complete contents of the relay log (including all statements modifying data that have been ...If no channel is named and no extra channels exist, the statement applies to the default ... SHOW RELAYLOG EVENTS [IN 'log_name'] [FROM pos] [LIMIT [offset,] row_count] ...
https://dev.mysql.com/doc/refman/8.0/en/temporary-table-problems.html
Temporary tables created with CREATE TEMPORARY TABLE have the following limitations: TEMPORARY tables are supported only by the InnoDB, MEMORY, MyISAM, and MERGE storage engines. It may occur for temporary tables created outside stored functions ...
https://dev.mysql.com/doc/refman/8.0/en/apis-perl.html
These sections contain information about using Perl with MySQL and writing MySQL applications in Perl: For installation instructions for Perl DBI support, see Section 2.10, “Perl Installation Notes”. For printed information, the official DBI ...
https://dev.mysql.com/doc/refman/8.0/en/begin-end.html
END syntax is used for writing compound statements, which can appear within stored programs (stored procedures and functions, triggers, and events). A compound statement can contain multiple statements, enclosed by the BEGIN and END keywords. In the ...statement_list represents a list of one or more statements, each terminated by a semicolon (;) statement ...
https://dev.mysql.com/doc/refman/8.0/en/binary-log-mysql-database.html
This pertains to statements such as INSERT, UPDATE, DELETE, REPLACE, DO, LOAD DATA, SELECT, and TRUNCATE TABLE. The CREATE TABLE part is logged using statement format and the SELECT part is logged according to the value of binlog_format. The ...