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https://dev.mysql.com/doc/refman/8.0/en/slow-query-log.html
As of MySQL 8.0.14, the timestamp indicates when the slow statement began executing. The slow query log consists of SQL statements that take more than long_query_time seconds to execute and require at least min_examined_row_limit rows to be ...By ...
https://dev.mysql.com/doc/refman/8.0/en/disk-issues.html
This makes both the seek and read times better, assuming that the disk is not used for other purposes as well. RAID N can be a problem if you have many writes, due to the time required to update the parity bits. You can also set the parameters for ... This section describes ways to configure storage devices when you can devote more and faster storage hardware to the database ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-txn.html
When a memcached operation inserts, updates, or deletes data in the underlying InnoDB table, the change might be committed to the InnoDB table instantly (if daemon_memcached_w_batch_size=1) or some time later (if the daemon_memcached_w_batch_size ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-standard-monitor.html
Example Standard Monitor output: mysql> SHOW ENGINE INNODB STATUS\G *************************** 1. Status This section shows the timestamp, the monitor name, and the number of seconds that per-second averages are based on. The number of seconds is ... The Lock Monitor is the same as the Standard Monitor except that it includes additional lock ...
https://dev.mysql.com/doc/refman/8.0/en/lateral-derived-tables.html
As of MySQL 8.0.14, a derived table may be defined as a lateral derived table to specify that such references are permitted. In accordance with the SQL standard, MySQL always treats a join with a table function such as JSON_TABLE() as though LATERAL ... A derived table cannot normally refer to (depend on) columns of preceding tables in the same FROM ...
https://dev.mysql.com/doc/refman/8.0/en/replication-administration-status.html
From MySQL 8.0.22, SHOW SLAVE STATUS is deprecated, and SHOW REPLICA STATUS is available to use instead. The MASTER_HEARTBEAT_PERIOD setting on the source (set by the CHANGE MASTER TO statement) specifies the frequency of the heartbeat, which ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-file-space.html
They can be created outside of the MySQL data directory, are capable of holding multiple tables, and support tables of all row formats. Every tablespace in a MySQL instance has the same page size. By default, all tablespaces have a page size of ...
https://dev.mysql.com/doc/refman/8.0/en/insert.html
TABLE in MySQL 8.0.19 and later to insert rows from a single table. In MySQL 8.0.19 and later, a row alias with one or more optional column aliases can be used with ON DUPLICATE KEY UPDATE to refer to the row to be inserted. In MySQL 8.0, the ...
https://dev.mysql.com/doc/refman/8.0/en/cost-model.html
These estimates are stored in the server_cost and engine_cost tables in the mysql system database and are configurable at any time. Cost Model General Operation The Cost Model Database Making Changes to the Cost Model Database Cost Model General ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-upgrading-member.html
If the primary is upgraded before a secondary, a new primary using the older MySQL version is chosen, but there is no need for this step. Important If an upgraded member has group_replication_start_on_boot=1 then it could rejoin the group before you ... This section explains the steps required for upgrading a member of a ...