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https://dev.mysql.com/doc/refman/8.0/en/stored-program-restrictions.html
Some of the restrictions noted here apply to all stored routines; that is, both to stored procedures and stored functions. There are also some restrictions specific to stored functions but not to stored procedures. The restrictions for stored ...
https://dev.mysql.com/doc/refman/8.0/en/sys-host-summary.html
These views summarize statement activity, file I/O, and connections, grouped by host. The host_summary and x$host_summary views have these columns: host The host from which the client connected. Rows for which the HOST column in the underlying ...
https://dev.mysql.com/doc/refman/8.0/en/sys-innodb-lock-waits.html
These views summarize the InnoDB locks that transactions are waiting for. The innodb_lock_waits and x$innodb_lock_waits views have these columns: wait_started The time at which the lock wait started. wait_age How long the lock has been waited for, ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-thread-trx-info.html
Returns a JSON object containing information about a given thread. The information includes the current transaction, and the statements it has already executed, derived from the Performance Schema events_transactions_current and ...
https://dev.mysql.com/doc/refman/8.0/en/sys-user-summary.html
These views summarize statement activity, file I/O, and connections, grouped by user. The user_summary and x$user_summary views have these columns: user The client user name. Rows for which the USER column in the underlying Performance Schema table ...
https://dev.mysql.com/doc/refman/8.0/en/sys-waits-by-host-by-latency.html
These views summarize wait events, grouped by host and event. By default, rows are sorted by host and descending total latency. The waits_by_host_by_latency and x$waits_by_host_by_latency views have these columns: host The host from which the ...
https://dev.mysql.com/doc/refman/8.0/en/sys-waits-by-user-by-latency.html
These views summarize wait events, grouped by user and event. By default, rows are sorted by user and descending total latency. The waits_by_user_by_latency and x$waits_by_user_by_latency views have these columns: user The user associated with the ...
https://dev.mysql.com/doc/refman/8.0/en/sys-waits-global-by-latency.html
The waits_global_by_latency and x$waits_global_by_latency views have these columns: events The event name. total_latency The total wait time of timed occurrences of the event. avg_latency The average wait time per timed occurrence of the event.
https://dev.mysql.com/doc/refman/8.0/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 ...
https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html
Before upgrading to MySQL 8.0, review the changes described in this section to identify those that apply to your current MySQL installation and applications. Changes marked as Incompatible change are incompatibilities with earlier versions of ...