https://dev.mysql.com/proxy-users.html
Two system variables help trace the proxy login process: proxy_user: This value is NULL if proxying is not used. If the plugin does not set this variable, its value is NULL. The plugin that authenticates a given connection may request that the ...
https://dev.mysql.com/referential-constraints-table.html
The possible values are CASCADE, SET NULL, SET DEFAULT, RESTRICT, NO ACTION. The possible values are CASCADE, SET NULL, SET DEFAULT, RESTRICT, NO ACTION. The REFERENTIAL_CONSTRAINTS table has these columns: CONSTRAINT_CATALOG The name of the catalog ...
https://dev.mysql.com/replication-administration-status.html
row *************************** Id: 10 User: root Host: slave1:58371 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 slave that drives the replication ... The ...
https://dev.mysql.com/replication-options-binary-log.html
Otherwise, if the table has a unique key all of whose columns are NOT NULL, then only the columns in the unique key need be logged. (If the table has neither a primary key nor a unique key without any NULL columns, then all columns must be used in ... 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 statements are written to the binary ...
https://dev.mysql.com/rewriter-query-rewrite-plugin-reference.html
If no error occurs when the rules table is loaded into memory, the plugin sets the message column to NULL. A non-NULL value indicates an error and the column contents are the error message. Users communicate with the plugin by modifying the set of ...
https://dev.mysql.com/select-into.html
If the FIELDS ESCAPED BY character is empty, no characters are escaped and NULL is output as NULL, not \N. INTO form of SELECT enables a query result to be stored in variables or written to a file: SELECT ... Column and line terminators can be ...
https://dev.mysql.com/storage-engines.html
row *************************** Engine: BLACKHOLE Support: YES Comment: /dev/null storage engine (anything you write to it disappears) Transactions: NO XA: NO Savepoints: NO *************************** 5. Blackhole: The Blackhole storage engine ...
https://dev.mysql.com/sys-diagnostics.html
Use NULL to collect data for the default of 60 seconds. Creates a report of the current server status for diagnostic purposes. This procedure disables binary logging during its execution by manipulating the session value of the sql_log_bin system ...
https://dev.mysql.com/sys-processlist.html
db The default database for the thread, or NULL if there is none. current_statement The statement the thread is executing, or NULL if it is not executing any statement. They provide more complete information than the SHOW PROCESSLIST statement and ...
https://dev.mysql.com/sys-ps-is-thread-instrumented.html
Returns YES or NO to indicate whether Performance Schema instrumentation for a given connection ID is enabled, UNKNOWN if the ID is unknown, or NULL if the ID is NULL. This is a value of the type given in the PROCESSLIST_ID column of the ...
