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https://dev.mysql.com/doc/refman/5.7/en/function-resolution.html
When the parser encounters a word that is the name of a built-in function, it must determine whether the name signifies a function call or is instead a nonexpression reference to an identifier such as a table or column name. This occurs even when ...
https://dev.mysql.com/doc/refman/5.7/en/index-hints.html
They also work with multi-table DELETE statements, but not with single-table DELETE, as shown later in this section. (For the general syntax for specifying tables in a SELECT statement, see Section 13.2.9.2, “JOIN Clause”.) The syntax for ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-system-tablespace.html
General tablespaces are multi-table tablespaces that can also be used as an alternative to the system tablespace. The system tablespace is the storage area for the InnoDB data dictionary, the doublewrite buffer, the change buffer, and undo logs. It ...To do so, specify the autoextend attribute for the last data file in the innodb_data_file_path setting, and restart the ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-undo-logs.html
Rollback segments reside in the system tablespace, in undo tablespaces, and in the temporary tablespace. Undo logs that reside in the temporary tablespace are used for transactions that modify data in user-defined temporary tables. InnoDB supports a ... An undo log is a collection of undo log records associated with a single read-write ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndb-api-statistics.html
Such actions include starting and closing (or aborting) transactions; primary key and unique key operations; table, range, and pruned scans; threads blocked while waiting for the completion of various operations; and data and events sent and ... A ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-restrictions.html
If you save event information in another table, you should not assume that the original events are still available later. For example, if you select events from a performance_schema table into a temporary table, intending to join that table with the ... The Performance Schema avoids using mutexes to collect or produce data, so there are no guarantees of consistency and results can sometimes be ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-cpustat-1sec.html
The cpustat-1sec table provides raw, per-thread CPU data obtained each second for each thread running in the NDB kernel. Like cpustat_50ms and cpustat_20sec, this table shows 20 measurement sets per thread, each referencing a period of the named ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-cpustat-20sec.html
The cpustat_20sec table provides raw, per-thread CPU data obtained each 20 seconds, for each thread running in the NDB kernel. Like cpustat_50ms and cpustat_1sec, this table shows 20 measurement sets per thread, each referencing a period of the ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-cpustat-50ms.html
The cpustat_50ms table provides raw, per-thread CPU data obtained each 50 milliseconds for each thread running in the NDB kernel. Like cpustat_1sec and cpustat_20sec, this table shows 20 measurement sets per thread, each referencing a period of the ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-logspaces.html
This table provides information about NDB Cluster log space usage. The logspaces table contains the following columns: node_id The ID of this data node. log_id The log ID; for Disk Data undo log files, this is the same as the value shown in the ...