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https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-virtual-table.html
The INNODB_SYS_VIRTUAL table provides metadata about InnoDB virtual generated columns and columns upon which virtual generated columns are based, equivalent to information in the SYS_VIRTUAL table in the InnoDB data dictionary. A row appears in the ...The value is large because it encodes the column sequence number and ordinal ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-statement-tables.html
These tables store statement events: events_statements_current: The current statement event for each thread. prepared_statements_instances: Prepared statement instances and statistics The following sections describe the statement event tables. There ...Statement events occur at a high level of the event ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-characteristics.html
The name of the performance_schema database is lowercase, as are the names of tables within it. Many tables in the performance_schema database are read only and cannot be modified: mysql> TRUNCATE TABLE performance_schema.setup_instruments; ERROR ...Generally, the effect is to reset the summary columns to 0 or NULL, not to remove ...
https://dev.mysql.com/doc/refman/5.7/en/show-tables.html
SHOW [FULL] TABLES [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLES lists the non-TEMPORARY tables in a given database. The LIKE clause, if present, indicates which table names to match. Matching performed by the LIKE clause is ...
https://dev.mysql.com/doc/refman/5.7/en/sys-table-exists.html
Tests whether a given table exists as a regular table, a TEMPORARY table, or a view. If both a temporary and a permanent table exist with the given name, TEMPORARY is returned. Parameters in_db VARCHAR(64): The name of the database in which to ...
https://dev.mysql.com/doc/refman/5.7/en/external-locking.html
External locking is the use of file system locking to manage contention for MyISAM database tables by multiple processes. External locking is used in situations where a single process such as the MySQL server cannot be assumed to be the only ...
https://dev.mysql.com/doc/refman/5.7/en/handler.html
] HANDLER tbl_name CLOSE The HANDLER statement provides direct access to table storage engine interfaces. OPEN statement opens a table, making it accessible using subsequent HANDLER ... This table object is not shared by other sessions and is not ...
https://dev.mysql.com/doc/refman/5.7/en/identifier-case-sensitivity.html
Each table within a database corresponds to at least one file within the database directory (and possibly more, depending on the storage engine). Consequently, the case sensitivity of the underlying operating system plays a part in the case ... In ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-examples.html
The tables that contain information about InnoDB transactions and data locks enable you to determine which transaction is waiting for another, and which resource is being requested. (For descriptions of these tables, see Section 14.16.2, “InnoDB ... Identifying Blocking Transactions It is sometimes helpful to identify which transaction blocks ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-object-filtering.html
The setup_objects table controls whether the Performance Schema monitors particular table and stored program objects. TABLE filtering affects table I/O events (wait/io/table/sql/handler instrument) and table lock events (wait/lock/table/sql/handler ...The OBJECT_TYPE column indicates the type of object to which a row ...