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https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-statement-latency.html
Rows for which the HOST 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 host.
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-statement-type.html
Rows for which the HOST 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/5.7/en/sys-host-summary.html
Rows for which the HOST 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/5.7/en/sys-innodb-lock-waits.html
These views summarize the InnoDB locks that transactions are waiting for. The innodb_lock_waits and x$innodb_lock_waits views have these columns: wait_started The time at which the lock wait started. wait_age How long the lock has been waited for, ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-index-statistics.html
The schema_index_statistics and x$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/5.7/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/5.7/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/5.7/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/5.7/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/5.7/en/thread-commands.html
Refresh The thread is flushing table, logs, or caches, or resetting status variable or replication server information. A thread can have any of the following Command values: Binlog Dump This is a thread on a replication source for sending binary ...