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https://dev.mysql.com/doc/refman/8.4/en/mysql-nutshell.html
This means that, using the default values for this option and for SOURCE_CONNECT_RETRY (60), the replica waits 60 seconds between reconnection attempts, and keeps attempting to reconnect at this rate for 10 minutes before timing out and failing over. A system variable added in MySQL 8.4.0 group_replication_preemptive_garbage_collection enables preemptive garbage collection for group replication running in single-primary mode, keeping only the write sets for those transactions that have not yet been ...
https://dev.mysql.com/doc/refman/8.4/en/scalar-subqueries.html
A scalar subquery is a simple operand, and you can use it almost anywhere a single column value or literal is legal, and you can expect it to have those characteristics that all operands have: a data type, a length, an indication that it can be ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-processlist-table.html
row *************************** ID: 5 USER: event_scheduler HOST: localhost DB: NULL COMMAND: Daemon TIME: 137 STATE: Waiting on empty queue INFO: NULL *************************** 2. row *************************** ID: 9 USER: me HOST: ... The MySQL ...
https://dev.mysql.com/doc/ndbapi/en/ndb-ndbindexscanoperation.html
Members Member names, types, and descriptions are shown in the following table: Table 2.47 IndexBound structure member names, types, and descriptions Name Type Description low_key const char* Row containing lower bound for scan (or NULL for scan ...
https://dev.mysql.com/doc/refman/8.4/en/invisible-columns.html
Invisible columns support the usual column attributes: NULL, NOT NULL, AUTO_INCREMENT, and so forth. row *************************** Table: t2 Create Table: CREATE TABLE `t2` ( `col1` int DEFAULT NULL, `col2` int DEFAULT NULL ) ENGINE=InnoDB DEFAULT ...An invisible column is normally hidden to queries, but can be accessed if explicitly ...
https://dev.mysql.com/doc/refman/8.4/en/selecting-all.html
For example, you may happen to think that the birth date for Bowser doesn't seem quite right. Consulting your original pedigree papers, you find that the correct birth year should be 1989, not 1979. Fix only the erroneous record with an UPDATE ...
https://dev.mysql.com/doc/extending-mysql/8.4/en/plugin-status-system-variables.html
For example: static int my_foo; static MYSQL_SYSVAR_INT(foo_var, my_foo, PLUGIN_VAR_RQCMDARG, "foo comment", NULL, NULL, 0, 0, INT_MAX, 0); ... For example: static MYSQL_THDVAR_BOOL(some_flag, PLUGIN_VAR_NOCMDARG, "flag comment", NULL, NULL, FALSE); ... The server plugin interface enables plugins to expose status and system variables using the status_vars and system_vars members of the general plugin ...
https://dev.mysql.com/doc/ndbapi/en/ndb-examples-timestamp2.html
The file timestamp2.cpp reproduced in this section provides an example of working in NDB API applications with the “new” MySQL temporal data types supporting fractional seconds. For more information working with MySQL temporal and other data ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-data-locks-table.html
row *************************** ENGINE: INNODB ENGINE_LOCK_ID: 139664434886512:1059:139664350547912 ENGINE_TRANSACTION_ID: 2569 THREAD_ID: 46 EVENT_ID: 12 OBJECT_SCHEMA: test OBJECT_NAME: t1 PARTITION_NAME: NULL SUBPARTITION_NAME: NULL INDEX_NAME: ...For information about which lock requests are blocked by which held locks, see Section 29.12.13.2, “The data_lock_waits ...
https://dev.mysql.com/doc/refman/8.4/en/trigger-syntax.html
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 15.1.22, “CREATE TRIGGER Statement”, and Section 15.1.34, “DROP TRIGGER Statement”. Here is a simple example that associates a ...