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https://dev.mysql.com/doc/refman/5.7/en/query-cache-thread-states.html
checking privileges on cached query The server is checking whether the user has privileges to access a cached query result. These thread states are associated with the query cache (see Section 8.10.3, “The MySQL Query Cache”). checking query ...
https://dev.mysql.com/doc/refman/5.7/en/replication-administration-status.html
row *************************** Id: 10 User: root Host: replica1:58371 db: NULL Command: Binlog Dump Time: 777 State: Has sent all binlog to slave; waiting for binlog to be updated Info: NULL Because it is the replica that drives the replication ...
https://dev.mysql.com/doc/refman/5.7/en/replication-delayed.html
Delayed replication can be used for several purposes: To protect against user mistakes on the source. MySQL 5.7 supports delayed replication such that a replica server deliberately lags behind the source by at least a specified amount of time. Use ...
https://dev.mysql.com/doc/refman/5.7/en/replication-multi-source-adding-binlog-master.html
These steps assume that you have enabled binary logging on the replication source server using --log-bin, the replica is using TABLE based replication metadata repositories, and that you have enabled a replication user and noted the current binary ...Use the CHANGE MASTER TO statement to configure a replication channel for each source on the replica (see Section 16.2.2, “Replication ...
https://dev.mysql.com/doc/refman/5.7/en/replication-rbr-safe-unsafe.html
These functions include FOUND_ROWS(), GET_LOCK(), IS_FREE_LOCK(), IS_USED_LOCK(), LOAD_FILE(), MASTER_POS_WAIT(), PASSWORD(), RAND(), RELEASE_LOCK(), ROW_COUNT(), SESSION_USER(), SLEEP(), SYSDATE(), SYSTEM_USER(), USER(), UUID(), and UUID_SHORT().
https://dev.mysql.com/doc/refman/5.7/en/replication-rules-table-options.html
For example, a GRANT statement, which updates the mysql.user system table but does not mention that table, is not affected by a filter that specifies mysql.% as the wildcard pattern. The replica checks for and evaluates table options only if either ...
https://dev.mysql.com/doc/refman/5.7/en/replication-semisync.html
When one user is too busy, this slows it down, which can be useful in some deployment situations. In addition to the built-in asynchronous replication, MySQL 5.7 supports an interface to semisynchronous replication that is implemented by plugins.
https://dev.mysql.com/doc/refman/5.7/en/replication-solutions-switch.html
To use CHANGE MASTER TO, add all information about how to connect to Replica 1 from Replica 2 or Replica 3 (user, password, port). You can tell a replica to change to a new source using the CHANGE MASTER TO statement. The replica does not check ...
https://dev.mysql.com/doc/refman/5.7/en/server-configuration.html
The MySQL server, mysqld, has many command options and system variables that can be set at startup to configure its operation. To determine the default command option and system variable values used by the server, execute this command: $> mysqld ...
https://dev.mysql.com/doc/refman/5.7/en/show-binary-logs.html
A user with the SUPER or REPLICATION CLIENT privilege may execute this statement. SHOW BINARY LOGS SHOW MASTER LOGS Lists the binary log files on the server. This statement is used as part of the procedure described in Section 13.4.1.1, “PURGE ...