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https://dev.mysql.com/doc/refman/8.0/en/error-log.html
For example, if mysqld notices that a table needs to be automatically checked or repaired, it writes a message to the error log. Depending on error log configuration, error messages may also populate the Performance Schema error_log table, to ...
https://dev.mysql.com/doc/refman/8.0/en/execution-plan-information.html
Depending on the details of your tables, columns, indexes, and the conditions in your WHERE clause, the MySQL optimizer considers many techniques to efficiently perform the lookups involved in an SQL query. A query on a huge table can be performed ...The set of operations that the optimizer chooses to perform the most efficient query is called the “query execution plan”, also known as the EXPLAIN ...
https://dev.mysql.com/doc/refman/8.0/en/federated-storage-engine.html
Querying a local FEDERATED table automatically pulls the data from the remote (federated) tables. The FEDERATED storage engine lets you access data from a remote MySQL database without using replication or cluster technology. To include the ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-member-actions.html
The Performance Schema table replication_group_member_actions lists the member actions that are available in the configuration, the events that trigger them, and whether or not they are currently enabled. The ... From MySQL 8.0.26, Group Replication ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-responses-failure-rejoin.html
While an auto-rejoin procedure is taking place, the Performance Schema table events_stages_current shows the event “Undergoing auto-rejoin procedure”, with the number of retries that have been attempted so far during this instance of the ... The ...
https://dev.mysql.com/doc/refman/8.0/en/index-preloading.html
Preloading enables you to put the table index blocks into a key cache buffer in the most efficient way: by reading the index blocks from disk sequentially. If there are enough blocks in a key cache to hold blocks of an entire index, or at least the ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached.html
The InnoDB memcached plugin (daemon_memcached) provides an integrated memcached daemon that automatically stores and retrieves data from InnoDB tables, turning the MySQL server into a fast “key-value store”. You can also access the same InnoDB ... Important The InnoDB memcached plugin was removed in MySQL 8.3.0, and was deprecated in MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-compression-oltp.html
The rise of SSD storage devices, which are fast but relatively small and expensive, makes compression attractive also for OLTP workloads: high-traffic, interactive websites can reduce their storage requirements and their I/O operations per second ...
https://dev.mysql.com/doc/refman/8.0/en/installation-layouts.html
Section 2.3.1, “MySQL Installation Layout on Microsoft Windows” Section 2.8.3, “MySQL Layout for Source Installation” Table 2.3, “MySQL Installation Layout for Generic Unix/Linux Binary Package” Table 2.12, “MySQL Installation Layout ... The installation layout differs for different installation types (for example, native packages, binary tarballs, and source tarballs), which can lead to confusion when managing different systems or using different installation ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-metadata.html
To see whether a keyring plugin is loaded, check the Information Schema PLUGINS table or use the SHOW PLUGINS statement (see Section 7.6.2, “Obtaining Server Plugin Information”). If the component loaded but failed to initialize, the value is ...