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https://dev.mysql.com/doc/refman/8.0/en/sys-ps-is-consumer-enabled.html
If the argument is not a valid consumer name, an error occurs. Returns YES or NO to indicate whether a given Performance Schema consumer is enabled, or NULL if the argument is NULL. (Prior to MySQL 8.0.18, the function returns NULL if the argument ...Example mysql> SELECT sys.ps_is_consumer_enabled('thread_instrumentation'); +------------------------------------------------------+ | sys.ps_is_consumer_enabled('thread_instrumentation') | +------------------------------------------------------+ | YES | ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-trace-statement-digest.html
If you find a statement of interest within the Performance Schema events_statements_summary_by_digest table, specify its DIGEST column MD5 value to this procedure and indicate the polling duration and interval. The result is a report of all ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statement-analysis.html
db The default database for the statement, or NULL if there is none. err_count The total number of errors produced by occurrences of the statement. The statement_analysis and x$statement_analysis views have these columns: query The normalized ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statements-with-runtimes-in-95th-percentile.html
db The default database for the statement, or NULL if there is none. err_count The total number of errors produced by occurrences of the statement. These views list statements with runtimes in the 95th percentile. The ...
https://dev.mysql.com/doc/refman/8.0/en/too-many-connections.html
If clients encounter Too many connections errors when attempting to connect to the mysqld server, all available connections are in use by other clients. The permitted number of connections is controlled by the max_connections system variable. The ...
https://dev.mysql.com/doc/refman/8.0/en/window-functions-named-windows.html
Windows can be defined and given names by which to refer to them in OVER clauses. If present in a query, the WINDOW clause falls between the positions of the HAVING and ORDER BY clauses, and has this syntax: WINDOW window_name AS (window_spec) [, ...
https://dev.mysql.com/doc/refman/8.0/en/windows-upgrading.html
For example, before upgrading from MySQL 5.7 to 8.0, use mysqladmin from MySQL 5.7 as follows: C:\> "C:\Program Files\MySQL\MySQL Server 5.7\bin\mysqladmin" -u root shutdown Note If the MySQL root user account has a password, invoke mysqladmin with ... There are two approaches for upgrading MySQL on Windows: Using MySQL Installer Using the Windows ZIP archive distribution The approach you select depends on how the existing installation was ...
https://dev.mysql.com/doc/refman/8.0/en/working-with-null.html
A common error when working with NULL is to assume that it is not possible to insert a zero or an empty string into a column defined as NOT NULL, but this is not the case. The NULL value can be surprising until you get used to it. Conceptually, ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-options-variables.html
In this case, the server could also produce error messages for other X Plugin settings because it cannot recognize them. This section describes the command options and system variables that configure X Plugin, as well as the status variables ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-progress-reporting.html
The following sys schema views provide progress reporting for long-running transactions: processlist session x$processlist x$session Assuming that the required instruments and consumers are enabled, the progress column of these views shows the ...