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https://dev.mysql.com/doc/refman/5.7/en/merge-storage-engine.html
The MERGE storage engine, also known as the MRG_MyISAM engine, is a collection of identical MyISAM tables that can be used as one. “Identical” means that all tables have identical column data types and index information. You cannot merge MyISAM ...
https://dev.mysql.com/doc/refman/5.7/en/multiple-server-clients.html
Specify the default Unix socket file and TCP/IP port number in the [client] group of an option file. Start the client with --protocol=TCP to connect using TCP/IP, --protocol=SOCKET to connect using a Unix socket file, --protocol=PIPE to connect ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-overview.html
For more information about data nodes, how they are organized in an NDB Cluster, and how they handle and store NDB Cluster data, see Section 21.2.2, “NDB Cluster Nodes, Node Groups, Fragment Replicas, and Partitions”. NDB Cluster is a ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-tcp-definition-direct.html
Note To take the best advantage of direct connections in this fashion with more than two data nodes, you must have a direct connection between each data node and every other data node in the same node group. Setting up a cluster using direct ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-server-side-help.html
mysql> help search_string If you provide an argument to the help command, mysql uses it as a search string to access server-side help from the contents of the MySQL Reference Manual. The proper operation of this command requires that the help ...
https://dev.mysql.com/doc/refman/5.7/en/processlist-access.html
The following sections list the possible Command values, and State values grouped by category. The following discussion enumerates the sources of process information, the privileges required to see process information, and describes the content of ...
https://dev.mysql.com/doc/refman/5.7/en/program-variables.html
Many MySQL programs have internal variables that can be set at runtime using the SET statement. See Section 13.7.4.1, “SET Syntax for Variable Assignment”, and Section 5.1.8, “Using System Variables”. Most of these program variables also ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary.html
These views summarize statement activity, file I/O, and connections, grouped by host. The host_summary and x$host_summary views have these columns: host The host from which the client connected. Rows for which the HOST column in the underlying ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-views.html
The sys schema contains many views that summarize Performance Schema tables in various ways. Most of these views come in pairs, such that one member of the pair has the same name as the other member, plus a x$ prefix. The view with the x$ prefix ...
https://dev.mysql.com/doc/refman/5.7/en/aggregate-functions.html
They are often used with a GROUP BY clause to group values into subsets. If you use an aggregate function in a statement containing no GROUP BY clause, it is equivalent to grouping on all rows. For more information, see Section 12.19.3, “MySQL ...