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https://dev.mysql.com/doc/refman/8.0/en/sys-execute-prepared-stmt.html
Thus, this procedure is useful primarily for executing dynamic statements on a one-time basis. Example mysql> CALL sys.execute_prepared_stmt('SELECT COUNT(*) FROM mysql.user'); +----------+ | COUNT(*) | +----------+ | 15 | +----------+ . Given an ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-views.html
The sys schema contains many views that summarize Performance Schema tables in various ways. Most of these views come in pairs, such that one member of the pair has the same name as the other member, plus a x$ prefix. The view with the x$ prefix ...
https://dev.mysql.com/doc/refman/8.0/en/view-restrictions.html
In this case, the view is stored in a temporary table and thus you are not really selecting from the table in a subquery and modifying it at the same time. (This is another reason you might wish to force MySQL to use the temptable algorithm by ...
https://dev.mysql.com/doc/refman/8.0/en/sys-io-global-by-wait-by-latency.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. avg_latency The average wait time per timed occurrence of the ...The io_global_by_wait_by_latency and x$io_global_by_wait_by_latency views have these columns: event_name The I/O event name, with the wait/io/file/ prefix ...
https://dev.mysql.com/doc/refman/8.0/en/adding-character-set.html
This section discusses the procedure for adding a character set to MySQL. To use the following instructions, you must have a MySQL source distribution. The proper procedure depends on whether the character set is simple or complex: If the character ...
https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-select-into-table.html
For example: INSERT INTO tbl_temp2 (fld_id) SELECT tbl_temp1.fld_order_id FROM tbl_temp1 WHERE tbl_temp1.fld_order_id > 100; Alternatively, you can use SELECT ... The same syntax can also be used inside stored routines using cursors and local ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-disabling.html
The audit_log_disable variable can be set in a MySQL Server option file, in a command-line startup string, or at runtime using a SET statement; for example: SET GLOBAL audit_log_disable = true; Setting audit_log_disable to true disables the audit ...
https://dev.mysql.com/doc/refman/8.0/en/backup-strategy-summary.html
But to make sure that you can sleep well, observe the following guidelines: Always tun the MySQL server with binary logging enabled (that is the default setting for MySQL 8.0). Make periodic full backups, using the mysqldump command shown earlier in ... In case of an operating system crash or power failure, InnoDB itself does all the job of recovering ...
https://dev.mysql.com/doc/refman/8.0/en/cache-index.html
A key cache must exist before you assign indexes to it, or an error occurs: mysql> CACHE INDEX t1 IN non_existent_cache; ERROR 1284 (HY000): Unknown key cache 'non_existent_cache' By default, table indexes are assigned to the main (default) key ...| ...
https://dev.mysql.com/doc/refman/8.0/en/charset-charsets.html
There is one subsection for each group of related character sets. To list the available character sets and their default collations, use the SHOW CHARACTER SET statement or query the INFORMATION_SCHEMA CHARACTER_SETS table. To avoid choosing the ...