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https://dev.mysql.com/doc/refman/8.4/en/telemetry-trace-format.html
The following span types are emitted by the telemetry component: Control Span Session Span Statement Span Control Span Issued when the telemetry configuration changes, notifying downstream system of which signal collection has been enabled or ...
https://dev.mysql.com/doc/refman/8.4/en/telemetry-trace-install.html
This section describes the installation of the server and client OpenTelemetry support. Installing Client Plugin The Telemetry plugin for the MySQL client can be enabled with a command line switch, --telemetry_client or from a configuration option, ...
https://dev.mysql.com/doc/refman/8.4/en/temporary-files.html
On Unix, MySQL uses the value of the TMPDIR environment variable as the path name of the directory in which to store temporary files. If TMPDIR is not set, MySQL uses the system default, which is usually /tmp, /var/tmp, or /usr/tmp. On Windows, ...
https://dev.mysql.com/doc/refman/8.4/en/test-pluggable-authentication.html
MySQL includes a test plugin that checks account credentials and logs success or failure to the server error log. This is a loadable plugin (not built in) and must be installed prior to use. The test plugin source code is separate from the server ...
https://dev.mysql.com/doc/refman/8.4/en/thread-commands.html
A thread can have any of the following Command values: Binlog Dump This is a thread on a replication source for sending binary log contents to a replica. Connect Used by replication receiver threads connected to the source, and by replication ...
https://dev.mysql.com/doc/refman/8.4/en/thread-pool-tuning.html
This section provides guidelines on determining the best configuration for thread pool performance, as measured using a metric such as transactions per second. Of chief importance is the number of thread groups in the thread pool, which can be set ...
https://dev.mysql.com/doc/refman/8.4/en/timezone-problems.html
If you have a problem with SELECT NOW() returning values in UTC and not your local time, you have to tell the server your current time zone. This should be done for the environment in which the server runs (for example, in mysqld_safe or ...
https://dev.mysql.com/doc/refman/8.4/en/update-optimization.html
An update statement is optimized like a SELECT query with the additional overhead of a write. 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 ...
https://dev.mysql.com/doc/refman/8.4/en/upgrade-best-practices.html
MySQL supports upgrading between minor versions (within an LTS series) and to the next major version (across an LTS series). LTS releases have 8+ years of support and are meant for production use. Performing a minor version upgrade is ...
https://dev.mysql.com/doc/refman/8.4/en/using-log-files.html
Note that before starting mysqld with the general query log enabled, you should check all your tables with myisamchk. If mysqld dies or hangs, you should start mysqld with the general query log enabled. When mysqld dies again, you can examine the ...