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Migrating from IBM IIDR

You can migrate replication from IBM InfoSphere Data Replication (IIDR / InfoSphere CDC) to TwinCommit table by table, with the existing subscriptions running until you are ready to switch. Each subscription becomes a pipeline file.

Concept mapping

Section titled “Concept mapping”
IIDR concept TwinCommit equivalent
Datastore (source) source: block
Datastore (target) target: block
Subscription One pipeline file
Table mapping tables: entry
Column filtering exclude_columns
Refresh twincommit snapshot -tables …
Mirroring twincommit run
Bookmark Checkpoint in state_schema on the target
Management Console / Access Server Pipeline YAML in Git, the CLI, Prometheus and the MCP server

Runbook

Section titled “Runbook”
  1. Export the subscription’s table list and write it as a tables: list.
  2. Confirm source settings. Db2 tables already replicated by IIDR usually have DATA CAPTURE CHANGES set. Run twincommit check.
  3. Use a shadow target schema for the parallel run.
  4. Snapshot, then stream:
    Terminal window
    twincommit snapshot -config sub-billing.yaml
    twincommit run -config sub-billing.yaml
  5. Verify with twincommit verify.
  6. Switch consumers to the new schema, then end the old subscription’s mirroring.