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https://dev.mysql.com/doc/refman/8.0/en/lock-tables.html
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} MySQL enables client sessions to acquire table locks explicitly for the purpose ...
https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html
While held by one session, other sessions cannot obtain a lock of the same name. Returns 1 if the lock was obtained successfully, 0 if the attempt timed out (for example, because another client has previously locked the name), or NULL if an error ...
https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html
ABS(X) Returns the absolute value of X, or NULL if X is NULL. An implication of this is that ABS(-9223372036854775808) produces an error because the result cannot be stored in a signed BIGINT value. mysql> SELECT ABS(2); -> 2 mysql> SELECT ABS(-32); ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-unix-servers.html
Note The discussion here uses mysqld_safe to launch multiple instances of MySQL. For MySQL installation using an RPM distribution, server startup and shutdown is managed by systemd on several Linux platforms. On these platforms, mysqld_safe is not ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-install-windows-binary.html
You should also have the MySQL client (mysql.exe) on this host. For management nodes and data nodes, it is not necessary to install the MySQL Server binary; however, each management node requires the management server daemon (ndb_mgmd.exe); each ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-logs-cluster-log.html
The following table lists the most common NDB cluster log messages. For information about the cluster log, log events, and event types, see Section 25.6.3, “Event Reports Generated in NDB Cluster”. These log messages also correspond to log ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-online-add-node-example.html
In this section we provide a detailed example illustrating how to add new NDB Cluster data nodes online, starting with an NDB Cluster having 2 data nodes in a single node group and concluding with a cluster having 4 data nodes in 2 node groups.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-option-tables.html
The following list includes command-line options, system variables, and status variables applicable within mysqld when it is running as an SQL node in an NDB Cluster. For a reference to all command-line options, system variables, and status ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-index-stat.html
ndb_index_stat provides per-fragment statistical information about indexes on NDB tables. This includes cache version and age, number of index entries per partition, and memory consumption by indexes. Running ndb_index_stat with the --update option ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-mgm.html
The ndb_mgm management client process is actually not needed to run the cluster. Its value lies in providing a set of commands for checking the cluster's status, starting backups, and performing other administrative functions. The management client ...