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https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-internal-data.html
For performance reasons, and to minimize the chance of misleading joins between the transaction and locking tables, InnoDB collects the required transaction and locking information into an intermediate buffer whenever a SELECT on any of the tables ... The data exposed by the transaction and locking tables (INNODB_TRX, INNODB_LOCKS, and INNODB_LOCK_WAITS) represents a glimpse into fast-changing ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-performance-spin_lock_polling.html
That number is generated by randomly selecting an integer ranging from 0 up to but not including the innodb_spin_wait_delay value, and multiplying that value by 50. InnoDB mutexes and rw-locks are typically reserved for short intervals. On a ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-temporary-tablespace.html
Issue a query similar to this one to view temporary tablespace metadata: mysql> SELECT * FROM INFORMATION_SCHEMA.FILES WHERE TABLESPACE_NAME='innodb_temporary'\G The Information Schema INNODB_TEMP_TABLE_INFO table provides metadata about ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting-datadict.html
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE '%#sql%'; To remove an orphan intermediate table, perform the following steps: In the database directory, rename the #sql-*.frm file to match the base name of the orphan intermediate ... Information about table definitions is stored both in the .frm files, and in the InnoDB data ...
https://dev.mysql.com/doc/refman/5.7/en/memory-storage-engine.html
SELECT or LOAD DATA into a file to load the table from a persistent data source, and use init_file to name the file. The MEMORY storage engine (formerly known as HEAP) creates special-purpose tables with contents that are stored in memory. Because ...
https://dev.mysql.com/doc/refman/5.7/en/merge-storage-engine.html
You can use SELECT, DELETE, UPDATE, and INSERT on MERGE tables. You must have SELECT, DELETE, and UPDATE privileges on the MyISAM tables that you map to a MERGE table. The MERGE storage engine, also known as the MRG_MyISAM engine, is a collection ...
https://dev.mysql.com/doc/refman/5.7/en/merge-table-problems.html
The definition of the MyISAM tables and the MERGE table are checked when the tables are accessed (for example, as part of a SELECT or INSERT statement). SELECT, neither as a temporary MERGE table, nor as a nontemporary MERGE table. SELECT ...; ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndb-api-statistics.html
A number of types of statistical counters relating to actions performed by or affecting Ndb objects are available. Such actions include starting and closing (or aborting) transactions; primary key and unique key operations; table, range, and pruned ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-commands.html
mysql sends each SQL statement that you issue to the server to be executed. There is also a set of commands that mysql itself interprets. For a list of these commands, type help or \h at the mysql> prompt: mysql> help List of all MySQL commands: ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-installation-windows-path.html
To make it easier to invoke MySQL programs, you can add the path name of the MySQL bin directory to your Windows system PATH environment variable: On the Windows desktop, right-click the My Computer icon, and select Properties. Next select the ...