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https://dev.mysql.com/doc/refman/5.7/en/locking-issues.html
MySQL manages contention for table contents using locking: Internal locking is performed within the MySQL server itself to manage contention for table contents by multiple threads. External locking occurs when the server and other programs lock ...
https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html
One implication of this behavior is that for equal argument values, RAND(N) returns the same value each time, and thus produces a repeatable sequence of column values. It is a fast way to generate random numbers on demand that is portable between ...
https://dev.mysql.com/doc/refman/5.7/en/miscellaneous-optimization-tips.html
To fix any compression issues that occur with ARCHIVE tables, use OPTIMIZE TABLE. If possible, classify reports as “live” or as “statistical”, where data needed for statistical reports is created only from summary tables that are generated ... This section lists a number of miscellaneous tips for improving query processing speed: If your application makes several database requests to perform related updates, combining the statements into a stored routine can help ...
https://dev.mysql.com/doc/refman/5.7/en/multiple-column-indexes.html
If you specify the columns in the right order in the index definition, a single composite index can speed up several kinds of queries on the same table. Note As an alternative to a composite index, you can introduce a column that is “hashed” ...
https://dev.mysql.com/doc/refman/5.7/en/myisamchk-memory.html
If you are going to use myisamchk on very large tables, you should first decide how much memory you want it to use. The following formula yields the amount of space required: (largest_key + row_pointer_length) * number_of_rows * 2 You can check the ...myisamchk uses no more memory than its memory-related variables are set ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-logging-management-commands.html
The following table describes the default setting (for all data nodes) of the cluster log category threshold. Table 21.48 Cluster log categories, with default threshold setting Category Default threshold (All data nodes) STARTUP 7 SHUTDOWN 7 ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-management.html
The values of these variables can be read in the mysql client from the output of a SHOW STATUS statement, or by querying either the SESSION_STATUS table or the GLOBAL_STATUS table (in the INFORMATION_SCHEMA database). By comparing the values of the ... Managing an NDB Cluster involves a number of tasks, the first of which is to configure and start NDB ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndb-innodb-engines.html
For those unaccustomed to working with NDB, unexpected behaviors can arise due to its distributed nature with regard to transactions, foreign keys, table limits, and other characteristics. The NDB storage engine is implemented using a distributed, ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-nodes-groups.html
However, it is also possible to employ user-defined partitioning with NDBCLUSTER tables. This is subject to the following limitations: Only the KEY and LINEAR KEY partitioning schemes are supported in production with NDB tables. The maximum number ... This section discusses the manner in which NDB Cluster divides and duplicates data for ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-rolling-restart.html
To free memory previously allocated to a table by successive INSERT and DELETE operations, for re-use by other NDB Cluster tables. Other parameters require that the data node be stopped completely using the management client STOP command, then ...