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https://dev.mysql.com/doc/refman/8.4/en/performance-schema-wait-tables.html
The Performance Schema instruments waits, which are events that take time. Within the event hierarchy, wait events nest within stage events, which nest within statement events, which nest within transaction events. These tables store wait events: ...
https://dev.mysql.com/doc/refman/8.4/en/replication-features-functions.html
Certain functions do not replicate well under some conditions: The USER(), CURRENT_USER() (or CURRENT_USER), UUID(), VERSION(), and LOAD_FILE() functions are replicated without change and thus do not work reliably on the replica unless row-based ...
https://dev.mysql.com/doc/refman/8.4/en/show-replica-status.html
SHOW REPLICA STATUS [FOR CHANNEL channel] This statement provides status information on essential parameters of the replica threads. The statement requires the REPLICATION CLIENT privilege (or the deprecated SUPER privilege). When run concurrently ...
https://dev.mysql.com/doc/refman/8.4/en/sys-host-summary-by-statement-latency.html
The host_summary_by_statement_latency and x$host_summary_by_statement_latency views have these columns: host The host from which the client connected. Rows for which the HOST column in the underlying Performance Schema table is NULL are assumed to ...
https://dev.mysql.com/doc/refman/8.4/en/sys-host-summary-by-statement-type.html
These views summarize information about statements executed, grouped by host and statement type. By default, rows are sorted by host and descending total latency. The host_summary_by_statement_type and x$host_summary_by_statement_type views have ...
https://dev.mysql.com/doc/refman/8.4/en/sys-user-summary-by-statement-latency.html
The user_summary_by_statement_latency and x$user_summary_by_statement_latency views have these columns: user The client user name. Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background ...
https://dev.mysql.com/doc/refman/8.4/en/sys-user-summary-by-statement-type.html
These views summarize information about statements executed, grouped by user and statement type. By default, rows are sorted by user and descending total latency. The user_summary_by_statement_type and x$user_summary_by_statement_type views have ...
https://dev.mysql.com/doc/refman/8.4/en/system-schema.html
It contains tables that store information required by the MySQL server as it runs. A broad categorization is that the mysql schema contains data dictionary tables that store database object metadata, and system tables used for other operational ...
https://dev.mysql.com/doc/refman/8.4/en/upgrading-what-is-upgraded.html
Installing a new version of MySQL may require upgrading these parts of the existing installation: The mysql system schema, which contains tables that store information required by the MySQL server as it runs (see Section 7.3, “The mysql System ...
https://dev.mysql.com/doc/refman/8.4/en/with.html
A common table expression (CTE) is a named temporary result set that exists within the scope of a single statement and that can be referred to later within that statement, possibly multiple times. The following discussion describes how to write ...