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https://dev.mysql.com/doc/refman/5.7/en/sys-memory-by-user-by-current-bytes.html
By default, rows are sorted by descending amount of memory used. The memory_by_user_by_current_bytes and x$memory_by_user_by_current_bytes views have these columns: user The client user name. Rows for which the USER column in the underlying ...
https://dev.mysql.com/doc/refman/5.7/en/truncate-table.html
Logically, TRUNCATE TABLE is similar to a DELETE statement that deletes all rows, or a sequence of DROP TABLE and CREATE TABLE statements. To achieve high performance, it bypasses the DML method of deleting data. Thus, it cannot be rolled back, it ...
https://dev.mysql.com/doc/refman/5.7/en/windows-select-server.html
The following table shows the available servers for Windows in MySQL 5.7. Binary Description mysqld Optimized binary with named-pipe support mysqld-debug Like mysqld, but compiled with full debugging and automatic memory allocation checking All of ...
https://dev.mysql.com/doc/refman/5.7/en/collation-diagnostics.html
The MySQL server generates diagnostics when it finds problems while parsing the Index.xml file: Unknown tags are written to the error log. For example, the following message results if a collation definition contains a <aaa> tag: [Warning] Buffered ...In other cases, when a collation description is generally correct but contains some unknown tags, the collation is initialized and is available for ...
https://dev.mysql.com/doc/refman/5.7/en/temporary-table-problems.html
Temporary tables created with CREATE TEMPORARY TABLE have the following limitations: TEMPORARY tables are supported only by the InnoDB, MEMORY, MyISAM, and MERGE storage engines. Use ALTER TABLE instead: ALTER TABLE old_name RENAME new_name; You ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-instrumentation-checking.html
It is always possible to determine what instruments the Performance Schema includes by checking the setup_instruments table. Changes to this code occur often, which also affects the set of instruments. It is not practical to list all the ...
https://dev.mysql.com/doc/refman/5.7/en/recovery-from-backups.html
| mysql For more information about using mysqlbinlog to process binary log files, see Section 7.5, “Point-in-Time (Incremental) Recovery”. Now, suppose that we have a catastrophic unexpected exit on Wednesday at 8 a.m. To recover, first we ...
https://dev.mysql.com/doc/refman/5.7/en/show-create-event.html
SHOW CREATE EVENT event_name This statement displays the CREATE EVENT statement needed to re-create a given event. It requires the EVENT privilege for the database from which the event is to be shown. For example (using the same event e_daily ...
https://dev.mysql.com/doc/refman/5.7/en/precision-math-examples.html
Consider the following stored procedure, which adds .0001 to a variable 1,000 times. The floating-point calculation introduces small errors: +--------+------------------+ | d | f | +--------+------------------+ | 1.0000 | 0.99999999999991 | ... This ...
https://dev.mysql.com/doc/refman/5.7/en/replication-gtids-functions.html
WAIT_FOR_EXECUTED_GTID_SET(): Waits until all transactions in a given GTID set have been executed. To perform the same check with GTID_SUBTRACT(), execute the following statement on the replica: SELECT GTID_SUBTRACT(source_gtid_executed, ... This ...