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https://dev.mysql.com/merge-storage-engine.html
There it is indexed but not as a PRIMARY KEY because a MERGE table cannot enforce uniqueness over the set of underlying tables. The MERGE storage engine, also known as the MRG_MyISAM engine, is a collection of identical MyISAM tables that can be ...
https://dev.mysql.com/multiple-data-directories.html
If (despite this warning) you run multiple servers using the same data directory and they have logging enabled, you must use the appropriate options to specify log file names that are unique to each server. Also, modify any other options that must ... Each MySQL Instance on a machine should have its own data ...
https://dev.mysql.com/myisamchk-table-info.html
To obtain a description of a MyISAM table or statistics about it, use the commands shown here. The output from these commands is explained later in this section. myisamchk -d tbl_name Runs myisamchk in “describe mode” to produce a description ...
https://dev.mysql.com/mysql-cluster-config-example.html
Another deviation is that sections are not uniquely identified by section name. Instead, unique sections (such as two different nodes of the same type) are identified by a unique ID specified as a parameter within the section. To support NDB ...
https://dev.mysql.com/mysql-cluster-config-starting.html
You may for the sake of convenience specify # a NodeId for any management server, although one will be allocated # for it automatically; if you do so, it must be in the range 1-255 # inclusive and must be unique among all IDs specified for cluster # ...Changes in configuration are also likely to be indicated when changes are made in the platform on which the cluster is run, or in applications that use the NDB Cluster 's ...
https://dev.mysql.com/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/mysql-cluster-ndbinfo-locks-per-fragment.html
fq_name is a fully qualified database object name in database/schema/name format, such as test/def/t1 or sys/def/10/b$unique. The locks_per_fragment table provides information about counts of lock claim requests, and the outcomes of these requests ...
https://dev.mysql.com/mysql-cluster-programs-ndb-restore.html
In addition, when ndb_restore is used to restore any tables containing unique indexes, you must include --disable-indexes or --rebuild-indexes. You should use this option prior to inserting new rows into the database; otherwise, it is possible for a ... The NDB Cluster restoration program is implemented as a separate command-line utility ndb_restore, which can normally be found in the MySQL bin ...
https://dev.mysql.com/numeric-type-overview.html
SERIAL is an alias for BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE. SERIAL DEFAULT VALUE in the definition of an integer column is an alias for NOT NULL AUTO_INCREMENT UNIQUE. SERIAL is an alias for BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE.
https://dev.mysql.com/partitioning-hash.html
You should be aware that, if a table has any unique keys, every column used in the partitioning expression for this table must be part of every unique key, including the primary key. See Section 23.6.1, “Partitioning Keys, Primary Keys, and Unique ... Partitioning by HASH is used primarily to ensure an even distribution of data among a predetermined number of ...
Document created the 26/06/2006, last modified the 26/10/2018
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