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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-processlist-table.html
The MySQL process list indicates the operations currently being performed by the set of threads executing within the server. For a comparison of this table with other sources, see Sources of Process Information. If you have the PROCESS privilege, ...
https://dev.mysql.com/doc/refman/8.0/en/problems-with-null.html
The concept of the NULL value is a common source of confusion for newcomers to SQL, who often think that NULL is the same thing as an empty string ''. For example, the following statements are completely different: mysql> INSERT INTO my_table ...
https://dev.mysql.com/doc/refman/8.0/en/replication-functions-async-failover.html
The following functions, which are available from MySQL 8.0.22 for standard source to replica replication and from MySQL 8.0.23 for Group Replication, enable you to add and remove replication source servers from the source list for a replication ...
https://dev.mysql.com/doc/refman/8.0/en/replication-gtids-restrictions.html
Because GTID-based replication is dependent on transactions, some features otherwise available in MySQL are not supported when using it. This section provides information about restrictions on and limitations of replication with GTIDs. When using ...
https://dev.mysql.com/doc/refman/8.0/en/replication-options-binary-log.html
Startup Options Used with Binary Logging System Variables Used with Binary Logging You can use the mysqld options and system variables that are described in this section to affect the operation of the binary log as well as to control which ...
https://dev.mysql.com/doc/refman/8.0/en/replication-options-source.html
This section describes the server options and system variables that you can use on replication source servers. You can specify the options either on the command line or in an option file. On the source and each replica, you must set the server_id ...
https://dev.mysql.com/doc/refman/8.0/en/replication-sbr-rbr.html
For most users, the mixed replication format should provide the best combination of data integrity and performance. If, however, you want to take advantage of the features specific to the statement-based or row-based replication format when ...
https://dev.mysql.com/doc/refman/8.0/en/searching-on-two-keys.html
An OR using a single key is well optimized, as is the handling of AND. The one tricky case is that of searching on two different keys combined with OR: SELECT field1_index, field2_index FROM test_table WHERE field1_index = '1' OR field2_index = '1' ...
https://dev.mysql.com/doc/refman/8.0/en/server-status-variables.html
The MySQL server maintains many status variables that provide information about its operation. You can view these variables and their values by using the SHOW [GLOBAL | SESSION] STATUS statement (see Section 15.7.7.37, “SHOW STATUS Statement”).
https://dev.mysql.com/doc/refman/8.0/en/show-create-view.html
SHOW CREATE VIEW view_name This statement shows the CREATE VIEW statement that creates the named view. row *************************** View: v Create View: CREATE ALGORITHM=UNDEFINED DEFINER=`bob`@`localhost` SQL SECURITY DEFINER VIEW `v` AS select ...