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The table you need has forty million rows, and change streaming can't start until every one of them is captured.
What you'll have at the end
A completed snapshot of one large table, taken without locking it or losing the changes made while it ran
You need
A Debezium connector already streaming change events from this PostgreSQL database, with a signaling table it can write to and a target table that carries a single-column primary key.
Not covered
Sizing this database's WAL retention or replication slot so it survives a long-running snapshot.
Turn your first table's writes into a live Kafka stream with CDC
set up the connector and its signaling table first if this database doesn't have them running yet
Catch a replication slot before it fills your Postgres disk
size retention for the run before triggering a snapshot that will take hours on a busy source
Checked 26 Aug 2026
Part of the Change Data Capture (CDC) cookbook