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https://dev.mysql.com/doc/refman/8.0/en/partitioning-limitations-partitioning-keys-unique-keys.html
The rule governing this relationship can be expressed as follows: All columns used in the partitioning expression for a partitioned table must be part of every unique key that the table may have. In other words, every unique key on the table must ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-show-tables.html
By default, this includes not only both user-created tables and NDB system tables, but NDB-specific indexes, internal triggers, and NDB Cluster Disk Data objects as well. --type, -t Can be used to restrict the output to one type of object, specified ... ndb_show_tables displays a list of all NDB database objects in the ...--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum ...
https://dev.mysql.com/doc/refman/8.0/en/show-tables.html
The optional EXTENDED modifier causes SHOW TABLES to list hidden tables created by failed ALTER TABLE statements. SHOW [EXTENDED] [FULL] TABLES [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLES lists the non-TEMPORARY tables in a ...
https://dev.mysql.com/doc/refman/8.0/en/column-count-limit.html
Functional key parts (see Section 15.1.15, “CREATE INDEX Statement”) are implemented as hidden virtual generated stored columns, so each functional key part in a table index counts against the table total column limit. mysql> CREATE TABLE t (a ... This section describes limits on the number of columns in tables and the size of individual ...The storage ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-buffer-page-lru-table.html
The INNODB_BUFFER_PAGE_LRU table provides 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 full. The ...It has ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-memory-summary-tables.html
Memory summary tables do not contain timing information because memory events are not timed. Example memory event summary information: mysql> SELECT * FROM performance_schema.memory_summary_global_by_event_name WHERE EVENT_NAME = ...Operation counts ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-stage-summary-tables.html
The Performance Schema maintains tables for collecting current and recent stage events, and aggregates that information in summary tables. Section 29.12.5, “Performance Schema Stage Event Tables” describes the events on which stage summaries ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-transaction-summary-tables.html
The Performance Schema maintains tables for collecting current and recent transaction events, and aggregates that information in summary tables. Section 29.12.7, “Performance Schema Transaction Tables” describes the events on which transaction ...Example transaction event summary information: mysql> SELECT * FROM performance_schema.events_transactions_summary_global_by_event_name LIMIT 1\G *************************** ...
https://dev.mysql.com/doc/refman/8.0/en/corrupted-myisam-tables.html
Even though the MyISAM table format is very reliable (all changes to a table made by an SQL statement are written before the statement returns), you can still get corrupted tables if any of the following events occur: The mysqld process is killed ...An unexpected computer shutdown occurs (for example, the computer is turned ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-disk-data-objects.html
Create a tablespace; assign the log file group, as well as one or more data files, to the tablespace. Create a Disk Data table that uses this tablespace for data storage. Now we can create a tablespace—an abstract container for files used by Disk ... NDB Cluster Disk Data storage is implemented using the following objects: Tablespace: Acts as containers for other Disk Data ...