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https://dev.mysql.com/doc/refman/5.7/en/innodb-undo-tablespaces.html
Undo tablespaces contain undo logs, which are collections of records containing information about how to undo the latest change by a transaction to a clustered index record. Undo logs are stored in the system tablespace by default but can be stored ...
https://dev.mysql.com/doc/refman/5.7/en/optimize-table.html
OPTIMIZE TABLE reorganizes the physical storage of table data and associated index data, to reduce storage space and improve I/O efficiency when accessing the table. The exact changes made to each table depend on the storage engine used by that ...
https://dev.mysql.com/doc/refman/5.7/en/replication-solutions-backups-read-only.html
Note The instructions in this section place the server to be backed up in a state that is safe for backup methods that get the data from the server, such as mysqldump (see Section 4.5.4, “mysqldump — A Database Backup Program”). You should not ...
https://dev.mysql.com/doc/refman/5.7/en/show-table-status.html
SHOW TABLE STATUS [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLE STATUS works likes SHOW TABLES, but provides a lot of information about each non-TEMPORARY table. You can also get this list using the mysqlshow --status db_name ...
https://dev.mysql.com/doc/refman/5.7/en/sorting-rows.html
You may have noticed in the preceding examples that the result rows are displayed in no particular order. It is often easier to examine query output when the rows are sorted in some meaningful way. This means that the order is undefined for columns ...
https://dev.mysql.com/doc/refman/5.7/en/xa-statements.html
To perform XA transactions in MySQL, use the following statements: XA {START|BEGIN} xid [JOIN|RESUME] XA END xid [SUSPEND [FOR MIGRATE]] XA PREPARE xid XA COMMIT xid [ONE PHASE] XA ROLLBACK xid XA RECOVER [CONVERT XID] For XA START, the JOIN and ...
https://dev.mysql.com/doc/refman/5.7/en/pam-pluggable-authentication.html
Proxy user support: PAM authentication can return to MySQL a user name different from the external user name passed by the client program, based on the PAM groups the external user is a member of and the authentication string provided. Optionally, ... Note PAM pluggable authentication is an extension included in MySQL Enterprise Edition, a commercial ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-source.html
When Group Replication is started on a server, the value of auto_increment_increment is changed to the value of group_replication_auto_increment_increment, which defaults to 7, and the value of auto_increment_offset is changed to the server ID. If ... This section describes the server options and system variables that you can use on replication source ...
https://dev.mysql.com/doc/refman/5.7/en/switchable-optimizations.html
The following list describes the permissible opt_name flag names, grouped by optimization strategy: Batched Key Access Flags batched_key_access (default off) Controls use of BKA join algorithm. Limit Optimization Flags prefer_ordering_index (default ...Its value is a set of flags, each of which has a value of on or off to indicate whether the corresponding optimizer behavior is enabled or ...
https://dev.mysql.com/doc/refman/5.7/en/replication-administration-skip.html
The binary log is organized as a sequence of groups known as event groups, and each event group consists of a sequence of events. For nontransactional tables, an event group corresponds to a single SQL statement. When you use a SET GLOBAL ... If ...