Homogeneous replication
The following section describes how Qlik Talend Data Integration handles replication from MySQL to MySQL-based targets. Note that homogeneous replication is only relevant with Replication data projects.
When replicating a TIMESTAMP column, the time is converted to UTC on the target.
Limitations and considerations
Homogeneous replication is not supported with the following Qlik Talend Data Integration configurations or operations:
- Apply Changes only tasks
- Stopping and resuming a task
- Starting a task from a timestamp
- When the If target table already exists in the task settings' Full Load Settings tab is set to Do nothing
data types
The data types will be identical with the following exceptions:
| MySQL source data types | MySQL-based target data types |
|---|---|
| JSON | LONGTEXT |
When using data types from other database engines, the data type on the target will be the corresponding MySQL data type. For more information on using non-native data types, refer to the MySQL online Help.
Collation
Table and column collations will be replicated to the target. Collatable data types are indicated by an asterisk (*) in the Supported data types table.
To support collation replication, the DBA must ensure that the collations defined for the source MySQL database are the same as those defined for the MySQL-based target database.
Non-nullable columns and primary/unique index names
Non-nullable columns and Primary/Unique Index names are preserved during homogeneous replication.