https://dev.mysql.com/replication-applier-status-by-worker-table.html
After STOP SLAVE, the THREAD_ID column becomes NULL, but the WORKER_ID value is preserved. This table provides details of the transactions handled by applier threads on a replication slave or Group Replication group member. For a single-threaded ...
https://dev.mysql.com/replication-applier-status-table.html
This table shows the current general transaction execution status on the slave server. The table provides information about general aspects of transaction applier status that are not specific to any thread involved. Thread-specific status ...
https://dev.mysql.com/replication-delayed.html
MySQL supports delayed replication such that a slave server deliberately executes transactions later than the master by at least a specified amount of time. This section describes how to configure a replication delay on a slave, and how to monitor ...
https://dev.mysql.com/replication-features-differing-tables.html
A column's default value is determined by a number of factors, including its type, whether it is defined with a DEFAULT option, whether it is declared as NULL, and the server SQL mode in effect at the time of its creation; for more information, see ... Source and target tables for replication do not have to be ...
https://dev.mysql.com/replication-privilege-checks-gr.html
Group Replication requires every table that is to be replicated by the group to have a defined primary key, or primary key equivalent where the equivalent is a non-null unique key. From MySQL 8.0.19, as well as securing asynchronous and ...
https://dev.mysql.com/replication-solutions-encrypted-connections.html
If this option is set to NULL when TLSv1.3 is used (which is the default if you do not set the option), the ciphersuites that are enabled by default are allowed. To use an encrypted connection for the transfer of the binary log required during ...
https://dev.mysql.com/row-subqueries.html
The expression is unknown (that is, NULL) if the subquery produces no rows. Scalar or column subqueries return a single value or a column of values. A row subquery is a subquery variant that returns a single row and can thus return more than one ...
https://dev.mysql.com/rwlock-instances-table.html
WRITE_LOCKED_BY_THREAD_ID When a thread currently has an rwlock locked in exclusive (write) mode, WRITE_LOCKED_BY_THREAD_ID is the THREAD_ID of the locking thread, otherwise it is NULL. The rwlock_instances table lists all the rwlock (read write ...
https://dev.mysql.com/schemata-table.html
A schema is a database, so the SCHEMATA table provides information about databases. The SCHEMATA table has these columns: CATALOG_NAME The name of the catalog to which the schema belongs. The following statements are equivalent: SELECT SCHEMA_NAME ...
https://dev.mysql.com/se-csv-limitations.html
All tables that you create using the CSV storage engine must have the NOT NULL attribute on all columns.
