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https://dev.mysql.com/doc/refman/8.0/en/explain-output.html
To fix this disparity between column lengths, use ALTER TABLE to lengthen ActualPC from 10 characters to 15 characters: mysql> ALTER TABLE tt MODIFY ActualPC VARCHAR(15); Now tt.ActualPC and et.EMPLOYID are both VARCHAR(15). EXPLAIN returns a row of ... The EXPLAIN statement provides information about how MySQL executes ...
https://dev.mysql.com/doc/refman/8.0/en/merge-table-problems.html
If you use ALTER TABLE to change a MERGE table to another storage engine, the mapping to the underlying tables is lost. Instead, the rows from the underlying MyISAM tables are copied into the altered table, which then uses the specified storage ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-ndb-comment-options.html
NDB_COLUMN Options In NDB Cluster, a column comment in a CREATE TABLE or ALTER TABLE statement can also be used to specify an NDB_COLUMN option. Changing a column's blob part size must be done using a copying ALTER TABLE; this operation cannot be ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-tables-table.html
When altering the storage engine of a table, table options that are not applicable to the new storage engine are retained in the table definition to enable reverting the table with its previously defined options to the original storage engine, if ...
https://dev.mysql.com/doc/refman/8.0/en/flush.html
| tables_option } flush_option: { BINARY LOGS | ENGINE LOGS | ERROR LOGS | GENERAL LOGS | HOSTS | LOGS | PRIVILEGES | OPTIMIZER_COSTS | RELAY LOGS [FOR CHANNEL channel] | SLOW LOGS | STATUS | USER_RESOURCES } tables_option: { table_synonym | ...Note ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbd-definition.html
When setting MaxNoOfAttributes, it is important to prepare in advance for any ALTER TABLE statements that you might want to perform in the future. This is due to the fact, during the execution of ALTER TABLE on a Cluster table, 3 times the number of ...Information about configuration parameters specific to NDB Cluster Disk Data tables can be found later in this section (see Disk Data Configuration ...
https://dev.mysql.com/doc/refman/8.0/en/general-tablespaces.html
The TABLESPACE option can be used with ALTER TABLE to move tables between general tablespaces, file-per-table tablespaces, and the system tablespace. Moving Tables Between Tablespaces Using ALTER TABLE ALTER TABLE with the TABLESPACE option can be ... A general tablespace is a shared InnoDB tablespace that is created using CREATE TABLESPACE ...To make ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-replication-conflict-resolution.html
Requirements Source Column Control Conflict Resolution Control Conflict Resolution Functions Conflict Resolution Exceptions Table Conflict Detection Status Variables Examples When using a replication setup involving multiple sources (including ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-data-encryption.html
ALTER SCHEMA and ALTER TABLESPACE operations do not apply the default_table_encryption setting. An ENCRYPTION clause must be specified explicitly to alter the encryption of an existing schema or general tablespace. When ... InnoDB supports ...InnoDB ...
https://dev.mysql.com/doc/refman/8.0/en/optimizer-hints.html
For example, you can enable an optimization for one table in a statement and disable the optimization for a different table. References to table and index names follow the usual identifier case-sensitivity rules (see Section 11.2.3, “Identifier ...