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https://dev.mysql.com/doc/refman/8.0/en/sys-innodb-lock-waits.html
locked_table_partition The name of the locked partition, if any; NULL otherwise. locked_table_subpartition The name of the locked subpartition, if any; NULL otherwise. These views summarize the InnoDB locks that transactions are waiting for. The ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-index-statistics.html
The schema_index_statistics and x$schema_index_statistics views have these columns: table_schema The schema that contains the table. select_latency The total wait time of timed reads using the index. insert_latency The total wait time of timed ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-unused-indexes.html
These views display indexes for which there are no events, which indicates that they are not being used. This view is most useful when the server has been up and processing long enough that its workload is representative. Otherwise, presence of an ...
https://dev.mysql.com/doc/refman/8.0/en/sys-user-summary-by-statement-latency.html
Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. full_scans The total number of full table scans by statements for the user.
https://dev.mysql.com/doc/refman/8.0/en/sys-user-summary-by-statement-type.html
Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. full_scans The total number of full table scans by occurrences of the ...
https://dev.mysql.com/doc/refman/8.0/en/sys-user-summary.html
Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background. These views summarize statement activity, file I/O, and connections, grouped ...
https://dev.mysql.com/doc/refman/8.0/en/using-spatial-indexes.html
The optimizer investigates whether available spatial indexes can be involved in the search for queries that use a function such as MBRContains() or MBRWithin() in the WHERE clause. The following query finds all objects that are in the given ...
https://dev.mysql.com/doc/refman/8.0/en/validate-password-installation.html
INSTALL COMPONENT loads the component, and also registers it in the mysql.component system table to cause it to be loaded during subsequent server startups. To uninstall the validate_password component, use this statement: UNINSTALL COMPONENT ...
https://dev.mysql.com/doc/refman/8.0/en/window-function-descriptions.html
This section describes nonaggregate window functions that, for each row from a query, perform a calculation using rows related to that row. Most aggregate functions also can be used as window functions; see Section 14.19.1, “Aggregate Function ...
https://dev.mysql.com/doc/refman/8.0/en/windows-installation-layout.html
All of the files are located within this parent directory, using the structure shown in the following table. Table 2.4 Default MySQL Installation Layout for Microsoft Windows Directory Contents of Directory Notes bin mysqld server, client and ...