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https://dev.mysql.com/doc/refman/5.7/en/replication-threads-monitor-worker.html
If slave_parallel_type is set to DATABASE (rather than LOGICAL_CLOCK), this value is always zero. On a multithreaded replica, the Performance Schema tables replication_applier_status_by_coordinator and replication_applier_status_by_worker show ...
https://dev.mysql.com/doc/refman/5.7/en/rewriting-subqueries.html
Today, MySQL Server and many other modern database systems offer a wide range of outer join types. Sometimes there are other ways to test membership in a set of values than by using a subquery. Also, on some occasions, it is not only possible to ...
https://dev.mysql.com/doc/refman/5.7/en/select-into.html
file_name cannot be an existing file, which among other things prevents files such as /etc/passwd and database tables from being modified. INTO form of SELECT enables a query result to be stored in variables or written to a file: SELECT ... Column ...
https://dev.mysql.com/doc/refman/5.7/en/select-optimization.html
Queries, in the form of SELECT statements, perform all the lookup operations in the database. Tuning these statements is a top priority, whether to achieve sub-second response times for dynamic web pages, or to chop hours off the time to generate ...
https://dev.mysql.com/doc/refman/5.7/en/server-administration.html
MySQL Server (mysqld) is the main program that does most of the work in a MySQL installation.
https://dev.mysql.com/doc/refman/5.7/en/server-loadable-functions.html
MySQL Enterprise Edition includes a firewall capability that implements an application-level firewall to enable database administrators to permit or deny SQL statement execution based on matching against patterns for accepted statement. MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/server-logs.html
See Section 13.7.6.3, “FLUSH Statement”, Section 4.5.2, “mysqladmin — A MySQL Server Administration Program”, and Section 4.5.4, “mysqldump — A Database Backup Program”. MySQL Server has several logs that can help you find out what ...
https://dev.mysql.com/doc/refman/5.7/en/server-plugins.html
MySQL Enterprise Edition includes a firewall plugin that implements an application-level firewall to enable database administrators to permit or deny SQL statement execution based on matching against allowlists of accepted statement patterns. MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/session-state-tracking.html
The following characteristics are relevant for this purpose: READ ONLY READ WRITE ISOLATION LEVEL WITH CONSISTENT SNAPSHOT Available Session State Trackers To support the session-tracking activities, notification is available for these types of ...A ...
https://dev.mysql.com/doc/refman/5.7/en/set-password.html
Setting the password for a named account (with a FOR clause) requires the UPDATE privilege for the mysql system database. SET PASSWORD [FOR user] = password_option password_option: { 'auth_string' | PASSWORD('auth_string') } The SET PASSWORD ...