Replication Guide and Reference

Planning for migration

Beginning with DB2 Universal Database Version 5, the replication component installation is not optional. After you install DB2 UDB Version 6, you cannot:

• Continue to use Version 5 of the Capture and Apply programs.

• Install Version 6 of the Capture and Apply programs on a DB2 UDB Version 5 (or earlier) system.

Interoperability between Version 1 and Version 6 replication components is not supported. Therefore, you must complete all Version 1 to Version 5 migrations before you introduce DB2 UDB Version 6. For information about migration from Version 1 to Version 5, see the migration information on the DB2 DataPropagator Web pages: http://www.software.ibm.com/data/dpropr

DB2 UDB Version 6 includes significant new functions to support replication, including support for LOBs and DB2 Universal Database Satellite Edition. These functions involve changes to both the run-time (Capture and Apply program) and administration components. You can upgrade these components in any order.

The Version 5 Capture and Apply components can run alongside the Version 6 Capture and Apply components; you do not need to migrate all servers at the same time.

In addition:

• The Version 6 Capture and Apply programs are backward-compatible with Version 5 sources and subscription sets. The Version 6 components will continue to use the critical section table in the same way that the Version 5 Capture and Apply programs did if the new prune lock control table is not present.

• The Version 6 Capture and Apply programs can use the new invocation options introduced for DB2 Universal Database Satellite Edition, even if the administration component remains at the Version 5 level.

• Version 6 of the administration component supports defining sources and subscription sets that include LOB columns. If you use the Version 5 Capture and Apply programs, the presence of LOB columns will cause them to fail.

DB2 UDB Version 6 supports both the mobile replication enabler command ASNCOPY and the new DB2 Universal Database Satellite Edition enabler command ASNSAT. Both commands use the same run-time components and control tables, so you can use either one to control the Capture and Apply programs. However, you cannot use the DB2 Universal Database Satellite Edition SYNCH command in an existing replication environment because the SYNCH command relies on centralized administration controlled by a central control server. The central control server is not aware of any existing replication environment administered without use of the SYNCH command.

For more information about DB2 Universal Database Satellite Edition, see Occasionally connected environments.

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