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https://dev.mysql.com/doc/refman/8.0/en/program-variables.html
Many MySQL programs have internal variables that can be set at runtime using the SET statement. See Section 15.7.6.1, “SET Syntax for Variable Assignment”, and Section 7.1.9, “Using System Variables”. To set the max_allowed_packet variable ...Most of these program variables also can be set at server startup by using the same syntax that applies to specifying program ...
https://dev.mysql.com/doc/refman/8.0/en/using-gdb-on-mysqld.html
In this case, you can only have one thread active at a time. Use the --gdb option to mysqld to install an interrupt handler for SIGINT (needed to stop mysqld with ^C to set breakpoints) and disable stack tracing and core file handling. It is very ...
https://dev.mysql.com/doc/refman/8.0/en/ddl-rewriter-options.html
If values specified at startup time are incorrect, the ddl_rewriter plugin may fail to initialize properly and the server does not load it. This section describes the command options that control operation of the ddl_rewriter plugin. To control ...
https://dev.mysql.com/doc/refman/8.0/en/explain-for-connection.html
Because of changes to data (and supporting statistics) it may produce a different result from running EXPLAIN on the equivalent query text. For example, if you are running a statement in one session that is taking a long time to complete, using ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-group-write-consensus.html
This section explains how to inspect and configure the maximum number of consensus instances at any time for a group. This maximum is referred to as the event horizon for a group, and is the maximum number of consensus instances that the group can ...This enables you to fine tune the performance of your Group Replication ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-upgrade.html
The basic process of upgrading members of a group is the same as upgrading stand-alone instances, see Chapter 3, Upgrading MySQL for the actual process of doing upgrade and types available. While you are in the process of upgrading an online group, ... This section explains how to upgrade a Group Replication ...
https://dev.mysql.com/doc/refman/8.0/en/locking-issues.html
External locking occurs when the server and other programs lock MyISAM table files to coordinate among themselves which program can access the tables at which time. This type of locking is internal because it is performed entirely by the server and ... MySQL manages contention for table contents using locking: Internal locking is performed within the MySQL server itself to manage contention for table contents by multiple ...
https://dev.mysql.com/doc/refman/8.0/en/optimizer-features-to-trace.html
Some features in the optimizer can be invoked many times during statement optimization and execution, and thus can make the trace grow beyond reason. They are: Greedy search: With an N-table join, this could explore factorial(N) plans. Range ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-views.html
The sys schema contains many views that summarize Performance Schema tables in various ways. Most of these views come in pairs, such that one member of the pair has the same name as the other member, plus a x$ prefix. The view with the x$ prefix ...
https://dev.mysql.com/doc/refman/8.0/en/update-optimization.html
The speed of the write depends on the amount of data being updated and the number of indexes that are updated. Another way to get fast updates is to delay updates and then do many updates in a row later. Performing multiple updates together is much ... An update statement is optimized like a SELECT query with the additional overhead of a ...For a MyISAM ...