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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-file-instances-table.html
If a file was opened and then closed, it was opened 1 time, but OPEN_COUNT is 0. The file_instances table lists all the files seen by the Performance Schema when executing file I/O instrumentation. If a file on disk has never been opened, it is not ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-session-account-connect-attrs-table.html
Application programs can provide key-value connection attributes to be passed to the server at connect time. The session_account_connect_attrs table contains connection attributes only for the current session, and other sessions associated with the ...For descriptions of common attributes, see Section 29.12.9, “Performance Schema Connection Attribute ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-session-connect-attrs-table.html
Application programs can provide key-value connection attributes to be passed to the server at connect time. To see connection attributes only for the current session, and other sessions associated with the session account, use the ...For ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-consumers-table.html
If you disable a consumer, the server does not spend time adding event information to it. For detailed information about the effect of enabling different consumers, see Section 29.4.7, “Pre-Filtering by Consumer”. The setup_consumers table has ...
https://dev.mysql.com/doc/refman/8.0/en/show-create-event.html
For example (using the same event e_daily defined and then altered in Section 15.7.7.18, “SHOW EVENTS Statement”): mysql> SHOW CREATE EVENT myschema.e_daily\G *************************** 1. SHOW CREATE EVENT event_name This statement displays ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-thread-stack.html
Returns a JSON formatted stack of all statements, stages, and events within the Performance Schema for a given thread ID. row *************************** thread_stack: {"rankdir": "LR","nodesep": "0.10", "stack_created": "2014-02-19 13:39:03", ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-object-overview.html
Note For MySQL instances with a large number of objects, this view might take a long time to execute. This view summarizes the types of objects within each schema. object_type The object type: BASE TABLE, INDEX (index_type), EVENT, FUNCTION, ...
https://dev.mysql.com/doc/refman/8.0/en/thread-commands.html
A thread can have any of the following Command values: Binlog Dump This is a thread on a replication source for sending binary log contents to a replica. Connect Used by replication receiver threads connected to the source, and by replication ...
https://dev.mysql.com/doc/refman/8.0/en/sorting-rows.html
You may have noticed in the preceding examples that the result rows are displayed in no particular order. It is often easier to examine query output when the rows are sorted in some meaningful way. This means that the order is undefined for columns ...
https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-select-into-table.html
The same syntax can also be used inside stored routines using cursors and local variables. For example: INSERT INTO tbl_temp2 (fld_id) SELECT tbl_temp1.fld_order_id FROM tbl_temp1 WHERE tbl_temp1.fld_order_id > 100; Alternatively, you can use SELECT ...