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https://dev.mysql.com/doc/refman/8.0/en/innodb-parameters.html
innodb_doublewrite Command-Line Format --innodb-doublewrite=value (≥ 8.0.30)--innodb-doublewrite[={OFF|ON}] (≤ 8.0.29) System Variable innodb_doublewrite Scope Global Dynamic (≥ 8.0.30) Yes Dynamic (≤ 8.0.29) No SET_VAR Hint Applies No Type ... InnoDB Startup Options InnoDB System Variables System variables that are true or false can be enabled at server startup by naming them, or disabled by using a --skip- ...
https://dev.mysql.com/doc/refman/8.0/en/invoking-programs.html
$> mysql --user=root test $> mysqladmin extended-status variables $> mysqlshow --help $> mysqldump -u root personnel Arguments that begin with a single or double dash (-, --) specify program options. To invoke a MySQL program from the command line ...
https://dev.mysql.com/doc/refman/8.0/en/json-creation-functions.html
mysql> SELECT JSON_OBJECT('id', 87, 'name', 'carrot'); +-----------------------------------------+ | JSON_OBJECT('id', 87, 'name', 'carrot') | +-----------------------------------------+ | {"id": 87, "name": "carrot"} | ... The functions listed in ...
https://dev.mysql.com/doc/refman/8.0/en/json-search-functions.html
type is one of the following data types: FLOAT DOUBLE DECIMAL SIGNED UNSIGNED DATE TIME DATETIME YEAR (MySQL 8.0.22 and later) YEAR values of one or two digits are not supported. The functions in this section perform search or comparison operations ...
https://dev.mysql.com/doc/refman/8.0/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-backup-using-management-client.html
Before starting a backup, make sure that the cluster is properly configured for performing one. If an existing backup_id value is used, the backup fails with the error Backup failed: file already exists. If used, the backup_id must follow ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-limitations-transactions.html
To avoid modification of the index during this double-read operation, the row found in the hidden index table is locked. A number of limitations exist in NDB Cluster with regard to the handling of transactions. The NDBCLUSTER storage engine ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbd-definition.html
This is due to the fact, during the execution of ALTER TABLE on a Cluster table, 3 times the number of attributes as in the original table are used, and a good practice is to permit double this amount. The [ndbd] and [ndbd default] sections are ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-config-values.html
The config_values table provides information about the current state of node configuration parameter values. Each row in the table corresponds to the current value of a parameter on a given node. The config_values table contains the following ...
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 ...