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https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-issues.html
Note Every NDB table is implicitly partitioned by key when it is created. This section discusses known problems or issues when using replication with NDB Cluster. A loss of connection can occur either between the source cluster SQL node and the ...
https://dev.mysql.com/doc/refman/5.7/en/replication-upgrade.html
When you upgrade servers that participate in a replication topology, you need to take into account each server's role in the topology and look out for issues specific to replication. Upgrade Procedure With Table Repair Or Rebuild Some upgrades may ...For general information and instructions for upgrading a MySQL Server instance, see Section 2.10, “Upgrading ...
https://dev.mysql.com/doc/refman/5.7/en/set.html
A SET is a string object that can have zero or more values, each of which must be chosen from a list of permitted values specified when the table is created. Trailing spaces are automatically deleted from SET member values in the table definition ...SET column values that consist of multiple set members are specified with members separated by commas ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-optimization-with-exists.html
The optimizer chooses SQL compliance over speed, so it accounts for the possibility that outer_expr might be NULL: If outer_expr is NULL, to evaluate the following expression, it is necessary to execute the SELECT to determine whether it produces ...
https://dev.mysql.com/doc/refman/5.7/en/declare-handler.html
statement handler_action: { CONTINUE | EXIT | UNDO } condition_value: { mysql_error_code | SQLSTATE [VALUE] sqlstate_value | condition_name | SQLWARNING | NOT FOUND | SQLEXCEPTION } The DECLARE ... HANDLER statement specifies a handler that deals ...
https://dev.mysql.com/doc/refman/5.7/en/drop-database.html
The DROP DATABASE statement removes from the given database directory those files and directories that MySQL itself may create during normal operation: All files with the following extensions: .BAK .DAT .HSH .MRG .MYD .MYI .TRG .TRN .cfg .db .frm ...
https://dev.mysql.com/doc/refman/5.7/en/example-auto-increment.html
To start with an AUTO_INCREMENT value other than 1, set that value with CREATE TABLE or ALTER TABLE, like this: mysql> ALTER TABLE tbl AUTO_INCREMENT = 100; InnoDB Notes For information about AUTO_INCREMENT usage specific to InnoDB, see Section ...
https://dev.mysql.com/doc/refman/5.7/en/example-foreign-keys.html
To demonstrate ON DELETE and ON UPDATE referential actions, drop the child table and recreate it to include ON UPDATE and ON DELETE subclauses with the CASCADE option. MySQL supports foreign keys, which permit cross-referencing related data across ...
https://dev.mysql.com/doc/refman/5.7/en/example-storage-engine.html
When you create an EXAMPLE table, the server creates a table format file in the database directory. mysql> CREATE TABLE test (i INT) ENGINE = EXAMPLE; Query OK, 0 rows affected (0.78 sec) mysql> INSERT INTO test VALUES(1),(2),(3); ERROR 1031 ... The ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-configuring-instances.html
Configuring group_replication_group_name tells the plugin that the group that it is joining, or creating, is named "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa". It is good practice to start the bootstrap member first, and let it create the group. Creating ... This section explains the configuration settings required for MySQL Server instances that you want to use for Group ...