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https://dev.mysql.com/doc/refman/8.4/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/mysql-em-plugin/en/myoem-performance-page-per-table-stats.html
By default, rows are sorted by descending total wait time (tables with most contention first). Table 5.10 Per Table Statistics Dashboard NameDescription Table Name The table name. Delete Latency The total wait time of timed delete I/O events for the ...
https://dev.mysql.com/doc/heatwave/en/mys-hw-lakehouse-create-table-auto-parallel-load-task.html
You can use Auto Parallel Load to set up the automatic creation of an external table along with the loading of data from files in Object Storage. We recommend setting up Auto Parallel Load with an input_list variable, and then using the ...To learn ...
https://dev.mysql.com/doc/refman/8.4/en/checksum-table.html
[QUICK | EXTENDED] CHECKSUM TABLE reports a checksum for the contents of a table. If you run CHECKSUM TABLE against a view, the Checksum value is always NULL, and a warning is returned. For a nonexistent table, CHECKSUM TABLE returns NULL and ...You ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-statistics-table.html
The information_schema_stats_expiry system variable defines the period of time before cached table statistics expire. If there are no cached statistics or statistics have expired, statistics are retrieved from storage engines when querying table ...
https://dev.mysql.com/doc/refman/8.4/en/myisam-table-close.html
Each MyISAM index file (.MYI file) has a counter in the header that can be used to check whether a table has been closed properly. If you get the following warning from CHECK TABLE or myisamchk, it means that this counter has gone out of sync: ...
https://dev.mysql.com/doc/refman/8.4/en/symbolic-links-to-tables.html
For files used by tables for other storage engines, you may get strange problems if you try to use symbolic links. For InnoDB tables, use the alternative technique explained in Section 17.6.1.2, “Creating Tables Externally” instead. Do not ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-information-schema-buffer-pool-tables.html
The InnoDB INFORMATION_SCHEMA buffer pool tables provide buffer pool status information and metadata about the pages within the InnoDB buffer pool. The InnoDB INFORMATION_SCHEMA buffer pool tables include those listed below: mysql> SHOW TABLES FROM ...INNODB_BUFFER_PAGE_LRU: Holds information about the pages in the InnoDB buffer pool, in particular how they are ordered in the LRU list that determines which pages to evict from the buffer pool when it becomes ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-transaction-tables.html
These tables store transaction events: events_transactions_current: The current transaction event for each thread. There are also summary tables that aggregate information about transaction events; see Section 29.12.20.5, “Transaction Summary ...
https://dev.mysql.com/doc/refman/8.4/en/create-table-generated-columns.html
It is permitted to mix VIRTUAL and STORED columns within a table. A function is deterministic if, given the same data in tables, multiple invocations produce the same result, independently of the connected user. A generated column definition can ...