Limitations and considerations

You should be aware of the following limitations and considerations when using a Microsoft SQL Server (MS-CDC) source:

• Sparse tables are not supported.
• Replicating data from indexed views is not supported.
• Limitations due to the requirement to have MS-CDC enabled on all source tables include:
  • Rename column is not supported
  • Truncate table is not supported
  • WRITETEXT and UPDATETEXT utilities are not supported

  For more information on MS-CDC limitations, see the Microsoft Help.

• Limitations when capturing DDL operations are as follows:

  • RENAME TABLE will no be captured. When a RENAME TABLE DDL is encountered, the task will continue capturing the changes without renaming the target table. If the task is stopped and resumed of if there is a recoverable error, the table will be suspended to allow the CT table to be manually aligned.
  • Table-level DDLs are not supported. When a table DDL is encountered, the DDL will be transferred to the target and the table will be suspended to allow the CT table to be manually aligned.

• When running without the db_owner role, the following limitations apply:

  • Capture of DDLs is not supported. To prevent replication errors, you must clear the Capture DDL events check box in the endpoint settings' Advanced tab before running the task.

  • MS-CDC cannot be enabled automatically and should therefore be enabled manually. To prevent replication errors, you must also clear the Enable MS-CDC on all captured tables check box in the endpoint settings' Advanced tab before running the task.

  Information noteSpecial permissions are required for running without the db_owner role. For more information, see Required permissions.
• Replication of computed columns is supported in Full Load replication tasks only. During CDC, INSERTs to computed columns will appear as NULL on the target and UPDATEs will be ignored.
• Microsoft Azure SQL Managed Instance partition switching is not supported.

• The following DML pattern is not supported:

  select <*> into <new_table> from <existing_table>

• Column-level encryption is not supported.
• When inserting a value into Microsoft Azure SQL Managed Instance spatial data types (GEOGRAPHY and GEOMETRY), one can either ignore the SRID (Spatial Reference System Identifier) property - in which case the default SRID will be used (0 for GEOMETRY and 4326 for GEOGRAPHY) - or specify a different number. When replicating tables with spatial data types, Qlik Replicate replaces the SRID that was inserted by user with the default SRID.
• Replicating GEOGRAPHY and GEOMETRY data types is only supported in limited LOB mode.
• Columnstore indexes are not supported.
• Memory-optimized tables (using In-Memory OLTP) are not supported.
• Temporal databases are not supported
• Delayed durability is not supported
• Due to an ODBC limitation, no more than 16 columns can be part of a Primary Key.
• Masked data will be created in the target without masking.

• OpenLDAP is not supported

• Replication from databases configured to use ADR (Accelerated Database Recovery) is not supported.

• Capturing DDL and DML statements within a single transaction is not supported.

• Replicating a table or schema with an apostrophe (') in its name is not supported.

• Changes applied to the database using DACPAC will not be captured.

• MS-CDC Change Tables with fixed size columns (including NCHAR and CHAR data), the sum of which exceeds 8060 bytes, are not supported.

• The AR_H_USER header column is not supported.

• System tables and views are not supported.

Non-supported Microsoft SQL Server (MS-CDC) security features

Tables that use the following security features are not supported:

• Always Encrypted
• Row-Level Security