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https://dev.mysql.com/doc/refman/5.7/en/timestamp-initialization.html
If a TIMESTAMP or DATETIME column definition includes an explicit fractional seconds precision value anywhere, the same value must be used throughout the column definition. TIMESTAMP and DATETIME columns can be automatically initializated and ...An ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-installation.html
This section describes the basics for planning, installing, configuring, and running an NDB Cluster. Whereas the examples in Section 21.4, “Configuration of NDB Cluster” provide more in-depth information on a variety of clustering options and ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-locking-reads.html
Here, LOCK IN SHARE MODE is not a good solution because if two users read the counter at the same time, at least one of them ends up in deadlock when it attempts to update the counter. If you query data and then insert or update related data within ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-consumer-filtering.html
If you disable a consumer, the server does not spend time maintaining destinations for that consumer. To enable or disable a consumer, set its ENABLED value to YES or NO. For example, if you do not care about historical event information, disable ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-overview.html
NDB Cluster is a technology that enables clustering of in-memory databases in a shared-nothing system. The shared-nothing architecture enables the system to work with very inexpensive hardware, and with a minimum of specific requirements for ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-redo-log-reader.html
Reads a redo log file, checking it for errors, printing its contents in a human-readable format, or both. Command-Line Format -mbyte # Type Numeric Default Value 0 Minimum Value 0 Maximum Value 15 -mbyte #: Starting megabyte. Command-Line Format ...
https://dev.mysql.com/doc/refman/5.7/en/union.html
FROM t2) ORDER BY sort_col; To additionally maintain sort order within individual SELECT results, add a secondary column to the ORDER BY clause: (SELECT 1 AS sort_col, col1a, col1b, ... UNION queries with an aggregate function in an ORDER BY clause ...[UNION [ALL | DISTINCT] SELECT ...] UNION combines the result from multiple SELECT statements into a single result ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndbmtd.html
This can be done by setting an appropriate value in the config.ini file for the MaxNoOfExecutionThreads configuration parameter or the ThreadConfig configuration parameter. Trace files are generated by critical errors in ndbmtd processes in a ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-table-statistics-with-buffer.html
By default, rows are sorted by descending total wait time (tables with most contention first). fetch_latency The total wait time of timed read I/O events for the table. insert_latency The total wait time of timed insert I/O events for the table.
https://dev.mysql.com/doc/refman/5.7/en/backup-policy.html
A full backup (a snapshot of the data at a point in time) can be done in MySQL with several tools. The incremental backups are smaller and take less time to produce. The tradeoff is that, at recovery time, you cannot restore your data just by ...For ...