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https://dev.mysql.com/doc/refman/8.0/en/lock-tables.html
This is explained in more detail in Table-Locking Restrictions and Conditions. LOCK {TABLE | TABLES} tbl_name [[AS] alias] lock_type [, tbl_name [[AS] alias] lock_type] ... lock_type: { READ [LOCAL] | [LOW_PRIORITY] WRITE } UNLOCK {TABLE | TABLES} ...
https://dev.mysql.com/doc/refman/8.0/en/merge-table-advantages.html
For more information about eq_ref and ref, see Section 15.8.2, “EXPLAIN Statement”. MERGE tables can help you solve the following problems: Easily manage a set of log tables. For example, you can put data from different months into separate ...
https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html
To check whether a query such as this is affected, use EXPLAIN and look for Impossible having in the Extra column. The function return value and type are the same as the return value and type of its argument, but the function result is not checked ...
https://dev.mysql.com/doc/refman/8.0/en/mrr-optimization.html
When MRR is used, the Extra column in EXPLAIN output shows Using MRR. Reading rows using a range scan on a secondary index can result in many random disk accesses to the base table when the table is large and not stored in the storage engine's ...
https://dev.mysql.com/doc/refman/8.0/en/myisamchk-table-info.html
The output from these commands is explained later in this section. To obtain a description of a MyISAM table or statistics about it, use the commands shown here. myisamchk -d tbl_name Runs myisamchk in “describe mode” to produce a description ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-basics.html
An SQL node is a mysqld process started with the --ndbcluster and --ndb-connectstring options, which are explained elsewhere in this chapter, possibly with additional MySQL server options as well. NDBCLUSTER (also known as NDB) is an in-memory ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-replication-starting.html
Note Unless you want replication to begin immediately, delay the start of the replication threads until the appropriate START REPLICA statement has been issued, as explained in Step 4 below. This section outlines the procedure for starting NDB ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-replication.html
This section explains how to set up and manage a configuration in which one group of computers operating as an NDB Cluster replicates to a second computer or group of computers. NDB Cluster supports asynchronous replication, more usually referred ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-what-is-new.html
When a join cannot be pushed, EXPLAIN should provide the reason or reasons. The following sections describe changes in the implementation of MySQL NDB Cluster in NDB Cluster 8.0 through 8.0.44, as compared to earlier release series. NDB Cluster 8.4 ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-javascript-download.html
As part of this quick-start guide, an example schema is provided which is referred to as the world_x schema. Many of the examples demonstrate Document Store functionality using this schema. Start your MySQL server so that you can load the world_x ...