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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/switchable-optimizations.html
For more information, see Section 10.2.2.5, “Derived Condition Pushdown Optimization” Derived Table Merging Flags derived_merge (default on) Controls merging of derived tables and views into outer query block. The derived_merge flag controls ...
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/performance-schema-prepared-statements-instances-table.html
Instrument Server Command statement/com/Prepare COM_STMT_PREPARE statement/com/Execute COM_STMT_EXECUTE statement/sql/prepare_sql SQLCOM_PREPARE statement/sql/execute_sql SQLCOM_EXECUTE The Performance Schema manages the contents of the ...This is ... The Performance Schema provides instrumentation for prepared statements, for which there are two protocols: The binary ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-table-privileges-table.html
The TABLE_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. TABLE_CATALOG The name of the catalog to which the table belongs. TABLE_SCHEMA The name of the schema ...The output does not list GRANT OPTION as a separate row with PRIVILEGE_TYPE='GRANT ...
https://dev.mysql.com/doc/refman/8.0/en/federated-usagenotes.html
It is possible for one FEDERATED table to point to another, but you must be careful not to create a loop. Care should be taken when creating a FEDERATED table since the index definition from an equivalent MyISAM or other table may not be supported.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-limitations-transactions.html
When a user-created NDB table is accessed using a unique index, the hidden index table is first read to find the primary key that is then used to read the user-created table. When a row referenced by a unique index in the user-created NDB table is ...NDBCLUSTER stores only part of a column value that uses any of MySQL's BLOB or TEXT data types in the table visible to MySQL; the remainder of the BLOB or TEXT is stored in a separate internal table that is not accessible to ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-import.html
db_name is the name of the database where the table into which to import the data is found; file_name is the name of the CSV file from which to read the data; this must include the path to this file if it is not in the current directory. The name of ... ndb_import imports CSV-formatted data, such as that produced by mysqldump --tab, directly into NDB using the NDB ...