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This section assumes that you have successfully completed the getting started guide and reviewed the Logical Replication Operational Guide.

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Schema Changes

PostgreSQL logical replication copies row changes, not DDL. That means schema changes on the publisher are not applied automatically on ParadeDB. Keep these rules in mind:
  • Existing replicated tables must stay schema-compatible on both sides
  • New tables must exist on ParadeDB before they can replicate there
  • BM25 indexes are local to ParadeDB and must be created or rebuilt there
  • Publication membership still controls whether a new table is replicated at all
-- On Publisher
ALTER TABLE mock_items ADD COLUMN num_stock int;
INSERT INTO mock_items (description, category, in_stock, latest_available_time, last_updated_date, metadata, created_at, rating, num_stock)
VALUES ('Green running shoes', 'Footwear', true, '14:00:00', '2024-07-09', '{}', '2024-07-09 14:00:00', 2, 900);

-- On Subscriber
ERROR: logical replication target relation "public.mock_items" is missing some replicated columns
For the safe rollout sequence, including subscriber-first additive DDL and how to handle non-additive changes, see Roll Out DDL Safely. If replication is already failing because the schemas diverged or because a conflict stopped the apply worker, see Troubleshoot Apply Failures. If you want a new table to replicate to ParadeDB, that table must be included in the publication. Publications created with FOR ALL TABLES include new tables automatically, and publications created with FOR TABLES IN SCHEMA ... include new tables created in those schemas automatically. If your publication was created from an explicit table list, new tables will not replicate until you add them manually. If you do not want a table replicated to ParadeDB, leave it out of the publication. For the full sequence for adding a replicated searchable table, see Add New Tables. 
-- On Publisher
ALTER PUBLICATION marketplace_pub ADD TABLE newly_added_table;

-- On Subscriber
ALTER SUBSCRIPTION marketplace_sub REFRESH PUBLICATION;