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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-data-lock-waits-table.html
The data_lock_waits table implements a many-to-many relationship showing which data lock requests in the data_locks table are blocked by which held data locks in the data_locks table. The table exposes not only which lock a session or transaction ...Held locks in data_locks appear in data_lock_waits only if they block some lock ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-temp-table-info.html
INNODB_TEMP_TABLE_INFO provides information about user-created InnoDB temporary tables that are active in the InnoDB instance. Create a simple InnoDB temporary table: mysql> CREATE TEMPORARY TABLE t1 (c1 INT PRIMARY KEY) ENGINE=INNODB; Query ...It ...
https://dev.mysql.com/doc/refman/8.0/en/backup-methods.html
You can also create a binary backup simply by copying the table files, as long as the server is not updating anything. Making Delimited-Text File Backups To create a text file containing a table's data, you can use SELECT * INTO OUTFILE 'file_name' ...Making a Hot Backup with MySQL Enterprise Backup Customers of MySQL Enterprise Edition can use the MySQL Enterprise Backup product to do physical backups of entire instances or selected databases, tables, or ...
https://dev.mysql.com/doc/refman/8.0/en/storage-requirements.html
Leftover Digits Number of Bytes 0 0 1 1 2 1 3 2 4 2 5 3 6 3 7 4 8 4 Date and Time Type Storage Requirements For TIME, DATETIME, and TIMESTAMP columns, the storage required for tables created before MySQL 5.6.4 differs from tables created from 5.6.4 ... InnoDB Table Storage Requirements NDB Table Storage Requirements Numeric Type Storage Requirements Date and Time Type Storage Requirements String Type Storage Requirements Spatial Type Storage Requirements JSON Storage Requirements The storage requirements for table data on disk depend on several ...
https://dev.mysql.com/doc/refman/8.0/en/stored-programs-logging.html
Triggers can update tables, so error messages similar to those for stored functions occur with CREATE TRIGGER if you do not have the required privileges. The use of NAME_CONST() can result in a problem for CREATE TABLE ... If a stored program that ... The binary log contains information about SQL statements that modify database ...
https://dev.mysql.com/doc/refman/8.0/en/timestamp-initialization.html
CREATE TABLE t1 ( ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, dt DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ); With a DEFAULT clause but no ON UPDATE CURRENT_TIMESTAMP clause, the column has the given ...
https://dev.mysql.com/doc/refman/8.0/en/storage-engine-setting.html
When you create a new table, you can specify which storage engine to use by adding an ENGINE table option to the CREATE TABLE statement: -- ENGINE=INNODB not needed unless you have set a different -- default storage engine. CREATE TABLE t1 (i INT) ...For example, in a replication setup, perhaps your source server uses InnoDB tables for maximum safety, but the replica servers use other storage engines for speed at the expense of durability or ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-instruments-table.html
When an instrument is enabled and executed, instrumented instances are created, which are visible in the xxx_instances tables, such as file_instances or rwlock_instances. The setup_instruments table lists classes of instrumented objects for which ...row *************************** NAME: stage/sql/executing ENABLED: NO TIMED: NO PROPERTIES: FLAGS: NULL VOLATILITY: 0 DOCUMENTATION: NULL ...
https://dev.mysql.com/doc/refman/8.0/en/function-resolution.html
This occurs even when the function name is used in nonexpression context: mysql> CREATE TABLE count(i INT); ERROR 1064 (42000): You have an error in your SQL syntax ... When the parser encounters a word that is the name of a built-in function, it ...
https://dev.mysql.com/doc/refman/8.0/en/show-engine.html
An NdbTransaction is created each time a table schema operation (such as CREATE TABLE or ALTER TABLE) is performed on an NDB table. An NdbBlob is created for each new operation involving a BLOB column in an NDB table. Note InnoDB mutexes and rwlocks ... SHOW ENGINE engine_name {STATUS | MUTEX} SHOW ENGINE displays operational information about a storage ...