DB2 Replication Guide and Reference

Before You Begin Migration

Before you proceed with the migration steps in the following sections, be aware of the following points.

• The migration program can execute at a Windows NT, Windows 95, or OS/2 control point, which must be able to connect to every source, target, and control server.

• The initial value for the Version 5 APPLY_QUAL is the Version 1 Apply ID. This Apply ID is the subscriber's ID supplied with the migration program.

  The term Apply qualifier (APPLY_QUAL) is a new concept in Version 5 subscription as well as a column in many subscription control tables. The value in APPLY_QUAL identifies the Apply instance that runs a given subscription. If you want to use an APPLY_QUAL different than the Version 1 Apply ID, you must update the migration database with a new APPLY_QUAL.

• The initial value for the Version 5 SET_NAME is the Version 1 COPY_TABLE.

  The term replication subscription (SET_NAME) is a new concept in Version 5. It groups many individual subscriptions to source tables on the same source server, where updates to all copies in the group are committed in a single target server transaction, and each copy reflects all source server updates up to a common source server synchronization point.

• The ASN.IBMSNAP_CCPPARMS, ASN.IBMSNAP_CRITSEC, and ASN.IBMSNAP_UOW tables remain in their altered format if fallback occurs.

• The data in the Version 1 userid.IBMSNAP_TRAIL table is not copied to or from the Version 5 ASN.IBMSNAP_APPLYTRAIL table during the MIGRATE or the FALLBACK actions.

• You must use the migration report to determine the order of registration and subscription migration.

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