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https://dev.mysql.com/doc/refman/8.0/en/view-updatability.html
They must not be expressions, such as these: 3.14159 col1 + 3 UPPER(col2) col3 / col4 (subquery) MySQL sets a flag, called the view updatability flag, at CREATE VIEW time. It is sometimes possible for a multiple-table view to be updatable, assuming ... Some views are updatable and references to them can be used to specify tables to be updated in data change ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-stages-current-table.html
The TIMER_START and TIMER_END values indicate when event timing started and ended. If an event has not finished, TIMER_END is the current timer value and TIMER_WAIT is the time elapsed so far (TIMER_END − TIMER_START). If an event is produced from ...The table stores one row per thread showing the current status of the thread's most recent monitored stage event, so there is no system variable for configuring the table ...
https://dev.mysql.com/doc/refman/8.0/en/sys-io-by-thread-by-latency.html
These views summarize I/O consumers to display time waiting for I/O, grouped by thread. total_latency The total wait time of timed I/O events for the thread. min_latency The minimum single wait time of timed I/O events for the thread. avg_latency ...The io_by_thread_by_latency and x$io_by_thread_by_latency views have these columns: user For foreground threads, the account associated with the ...
https://dev.mysql.com/doc/refman/8.0/en/sys-io-global-by-file-by-latency.html
These views summarize global I/O consumers to display time waiting for I/O, grouped by file. total_latency The total wait time of timed I/O events for the file. read_latency The total wait time of timed read I/O events for the file. write_latency ...The io_global_by_file_by_latency and x$io_global_by_file_by_latency views have these columns: file The file path ...
https://dev.mysql.com/doc/refman/8.0/en/sys-io-global-by-wait-by-bytes.html
These views summarize global I/O consumers to display amount of I/O and time waiting for I/O, grouped by event. total_latency The total wait time of timed occurrences of the I/O event. min_latency The minimum single wait time of timed occurrences ...By default, rows are sorted by descending total I/O (bytes read and ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statements-with-full-table-scans.html
By default, rows are sorted by descending percentage of time a full scan was done and descending total latency. total_latency The total wait time of timed statement events for the statement. no_index_used_count The total number of times no index was ... These views display normalized statements that have done full table ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statements-with-runtimes-in-95th-percentile.html
These views list statements with runtimes in the 95th percentile. The statements_with_runtimes_in_95th_percentile and x$statements_with_runtimes_in_95th_percentile views have these columns: query The normalized statement string. total_latency The ...db The default database for the statement, or NULL if there is ...
https://dev.mysql.com/doc/refman/8.0/en/all-subqueries.html
Thus, these two statements are the same: SELECT s1 FROM t1 WHERE s1 <> ALL (SELECT s1 FROM t2); SELECT s1 FROM t1 WHERE s1 NOT IN (SELECT s1 FROM t2); MySQL 8.0.19 supports the TABLE statement. The expression is TRUE if table t2 contains (-5,0,+5) ...
https://dev.mysql.com/doc/refman/8.0/en/alter-logfile-group.html
ALTER LOGFILE GROUP logfile_group ADD UNDOFILE 'file_name' [INITIAL_SIZE [=] size] [WAIT] ENGINE [=] engine_name This statement adds an UNDO file named 'file_name' to an existing log file group logfile_group. An ALTER LOGFILE GROUP statement has ...
https://dev.mysql.com/doc/refman/8.0/en/alter-procedure.html
ALTER PROCEDURE proc_name [characteristic ...] characteristic: { COMMENT 'string' | LANGUAGE SQL | { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA } | SQL SECURITY { DEFINER | INVOKER } } This statement can be used to change the ...