Search Results
https://dev.mysql.com/doc/refman/8.4/en/innodb-tablespace-autoextend-size.html
When a file-per-table or general tablespace is created with a non-zero AUTOEXTEND_SIZE setting, the tablespace is initialized at the specified AUTOEXTEND_SIZE size. For tables created in file-per-table tablespaces, SHOW CREATE TABLE shows the ... By ...
https://dev.mysql.com/doc/refman/8.4/en/join.html
A consequence of the definition of coalesced columns is that, for outer joins, the coalesced column contains the value of the non-NULL column if one of the two columns is always NULL. MySQL supports the following JOIN syntax for the ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-limitations-transactions.html
When a user-created NDB table is accessed using a unique index, the hidden index table is first read to find the primary key that is then used to read the user-created table. When a row referenced by a unique index in the user-created NDB table is ... A number of limitations exist in NDB Cluster with regard to the handling of ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-quick.html
First, you need to create a configuration directory such as /var/lib/mysql-cluster, by executing the following command as the system root user: $> mkdir /var/lib/mysql-cluster In this directory, create a file named config.ini that contains the ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-replication-preparation.html
If the source cluster is already in use, you can create a backup of the source and load this onto the replica to cut down on the amount of time required for the replica to synchronize itself with the source. ndb-connectstring=management_host[:port] ... Preparing the NDB Cluster for replication consists of the following steps: Check all MySQL servers for version compatibility (see Section 25.7.2, “General Requirements for NDB Cluster ...
https://dev.mysql.com/doc/refman/8.4/en/mysqldump-sql-format.html
This section describes how to use mysqldump to create SQL-format dump files. With --all-databases or --databases, mysqldump writes CREATE DATABASE and USE statements prior to the dump output for each database. This ensures that when the dump file ...For information about reloading such dump files, see Section 9.4.2, “Reloading SQL-Format ...
https://dev.mysql.com/doc/refman/8.4/en/partitioning-management.html
Note All partitions of a partitioned table must have the same number of subpartitions; it is not possible to change the subpartitioning once the table has been created. To change a table's partitioning scheme, it is necessary only to use the ALTER ... There are a number of ways using SQL statements to modify partitioned tables; it is possible to add, drop, redefine, merge, or split existing partitions using the partitioning extensions to the ALTER TABLE ...
https://dev.mysql.com/doc/refman/8.4/en/partitioning-pruning.html
In the second case, the optimizer evaluates the partitioning expression for each value in the list, creates a list of matching partitions, and then scans only the partitions in this partition list. The optimization known as partition pruning is ...
https://dev.mysql.com/doc/refman/8.4/en/precision-math-examples.html
Consider these statements: mysql> CREATE TABLE t (i INT, d DECIMAL, f FLOAT); mysql> INSERT INTO t VALUES(1,1,1); mysql> CREATE TABLE y SELECT AVG(i), AVG(d), AVG(f) FROM t; The result is a double only for the floating-point argument. This section ...
https://dev.mysql.com/doc/refman/8.4/en/rename-table.html
You must have ALTER and DROP privileges for the original table, and CREATE and INSERT privileges for the new table. In such cases, you must drop and re-create the foreign keys for them to function properly. row *************************** Table: t3 ... RENAME TABLE tbl_name TO new_tbl_name [, tbl_name2 TO new_tbl_name2] ...