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https://dev.mysql.com/doc/refman/5.7/en/subqueries.html
A subquery can contain many of the keywords or clauses that an ordinary SELECT can contain: DISTINCT, GROUP BY, ORDER BY, LIMIT, joins, index hints, UNION constructs, comments, functions, and so on. All subquery forms and operations that the SQL ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-file-io-type.html
These views summarize file I/O, grouped by host and event type. By default, rows are sorted by host and descending total I/O latency. The host_summary_by_file_io_type and x$host_summary_by_file_io_type views have these columns: host The host from ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-file-io.html
By default, rows are sorted by descending total file I/O latency. The host_summary_by_file_io and x$host_summary_by_file_io views have these columns: host The host from which the client connected. Rows for which the HOST column in the underlying ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary-by-stages.html
By default, rows are sorted by host and descending total latency. The host_summary_by_stages and x$host_summary_by_stages views have these columns: host The host from which the client connected. Rows for which the HOST column in the underlying ...
https://dev.mysql.com/doc/refman/5.7/en/sys-innodb-buffer-stats-by-schema.html
These views summarize the information in the INFORMATION_SCHEMA INNODB_BUFFER_PAGE table, grouped by schema. Warning Querying views that access the INNODB_BUFFER_PAGE table can affect performance. Do not query these views on a production system ...
https://dev.mysql.com/doc/refman/5.7/en/sys-innodb-buffer-stats-by-table.html
These views summarize the information in the INFORMATION_SCHEMA INNODB_BUFFER_PAGE table, grouped by schema and table. Warning Querying views that access the INNODB_BUFFER_PAGE table can affect performance. Do not query these views on a production ...
https://dev.mysql.com/doc/refman/5.7/en/sys-io-by-thread-by-latency.html
These views summarize I/O consumers to display time waiting for I/O, grouped by thread. The io_by_thread_by_latency and x$io_by_thread_by_latency views have these columns: user For foreground threads, the account associated with the thread.
https://dev.mysql.com/doc/refman/5.7/en/sys-io-global-by-file-by-bytes.html
These views summarize global I/O consumers to display amount of I/O, grouped by file. By default, rows are sorted by descending total I/O (bytes read and written). The io_global_by_file_by_bytes and x$io_global_by_file_by_bytes views have these ...
https://dev.mysql.com/doc/refman/5.7/en/sys-io-global-by-file-by-latency.html
These views summarize global I/O consumers to display time waiting for I/O, grouped by file. The io_global_by_file_by_latency and x$io_global_by_file_by_latency views have these columns: file The file path name. total_latency The total wait time of ...
https://dev.mysql.com/doc/refman/5.7/en/sys-io-global-by-wait-by-bytes.html
These views summarize global I/O consumers to display amount of I/O and time waiting for I/O, grouped by event. By default, rows are sorted by descending total I/O (bytes read and written). The io_global_by_wait_by_bytes and ...