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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-lock-tables.html
The Performance Schema exposes lock information through these tables: data_locks: Data locks held and requested data_lock_waits: Relationships between data lock owners and data lock requestors blocked by those owners metadata_locks: Metadata locks ...
https://dev.mysql.com/doc/refman/8.0/en/string-type-syntax.html
In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. Specifying the CHARACTER SET binary attribute for a character string data type causes the column to be created as the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-instrument-naming.html
Example names: wait/io/file/myisam/log wait/io/file/mysys/charset wait/lock/table/sql/handler wait/synch/cond/mysys/COND_alarm wait/synch/cond/sql/BINLOG::update_cond wait/synch/mutex/mysys/BITMAP_mutex wait/synch/mutex/sql/LOCK_delete ...This ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-optimization.html
To see whether a given Performance Schema table has indexes and what they are, use SHOW INDEX or SHOW CREATE TABLE: mysql> SHOW INDEX FROM performance_schema.accounts\G *************************** 1. row *************************** Table: accounts ... Applications that monitor databases may make frequent use of Performance Schema ...For example, include a WHERE clause that ...
https://dev.mysql.com/doc/refman/8.0/en/connection-access.html
The server performs identity and credentials checking using columns in the user table, accepting the connection only if these conditions are satisfied: The client host name and user name match the Host and User columns in some user table row. When ...
https://dev.mysql.com/doc/refman/8.0/en/replication-gtids-restrictions.html
If a source used STATEMENT format and a replica used ROW format, the replica would be unable to handle the transaction correctly, therefore the CREATE TABLE ... When binlog_format is set to STATEMENT, CREATE TEMPORARY TABLE and DROP TEMPORARY TABLE ...When using GTIDs, updates to tables using nontransactional storage engines such as MyISAM cannot be made in the same statement or transaction as updates to tables using transactional storage engines such as ...
https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-select-into-table.html
For example: INSERT INTO tbl_temp2 (fld_id) SELECT tbl_temp1.fld_order_id FROM tbl_temp1 WHERE tbl_temp1.fld_order_id > 100; Alternatively, you can use SELECT ... The same syntax can also be used inside stored routines using cursors and local ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-connection-attribute-tables.html
These Performance Schema tables expose attribute information: session_account_connect_attrs: Connection attributes for the current session, and other sessions associated with the session account session_connect_attrs: Connection attributes for all ... Connection attributes are key-value pairs that application programs can pass to the server at connect ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-miscellaneous-tables.html
The following sections describe tables that do not fall into the table categories discussed in the preceding sections: component_scheduler_tasks: The current status of each scheduled task. user_defined_functions: Loadable functions registered by a ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-stored-procs.html
Are stored procedures and functions created on a replication source server replicated to a replica? A.4.24. You can manage stored procedures with CREATE [FUNCTION|PROCEDURE], ALTER [FUNCTION|PROCEDURE], DROP [FUNCTION|PROCEDURE], and SHOW CREATE ...