PostgreSQL to Snowflake
real-time replication
TwinCommit replicates PostgreSQL to Snowflake in real time by reading the PostgreSQL transaction log and applying every committed change exactly once and in commit order. Use it to feed Snowflake with live PostgreSQL data for analytics, AI and reporting, with no triggers or capture tables on the source.
PostgreSQL
log reader
commit-ordered · exactly-once
Snowflake
native writer
How capture works on PostgreSQL
TwinCommit uses a logical replication slot with the built-in pgoutput plugin, so there is nothing to install on the server.
Prerequisites
- ✓wal_level = logical
- ✓REPLICATION privilege
- ✓Primary key or REPLICA IDENTITY FULL
How apply works on Snowflake
Rows land through Snowpipe Streaming into a change table and are merged into the target on a short, configurable interval.
Requirements
- ✓Key-pair authentication for a service user
- ✓A warehouse for the MERGE step
- ✓OWNERSHIP or INSERT/UPDATE/DELETE on the target schema
Setup
Set up PostgreSQL → Snowflake in four steps
- 1
Prepare PostgreSQL
Run twincommit check. It verifies wal_level = logical and the other prerequisites, and prints the exact fix for anything missing.
- 2
Point at Snowflake
Add a target block for Snowflake. TwinCommit can generate target DDL with twincommit ddl -apply.
- 3
Snapshot
twincommit snapshot copies each table under a brief share lock and records the exact log position.
- 4
Stream
twincommit run streams every committed change from that position, exactly once and in commit order.
source:
type: postgres
dsn: ${SOURCE_DSN}
slot: twincommit
target:
type: snowflake
account: myorg-myaccount
warehouse: REPLICATION_WH
database: RAW
private_key_file: /secrets/sf.p8
tables:
- source: SALES.ORDERS
- source: SALES.ORDER_LINES
exclude_columns: [INTERNAL_NOTES]PostgreSQL to Snowflake replication FAQ
How does TwinCommit replicate PostgreSQL to Snowflake?
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TwinCommit reads changes from the PostgreSQL transaction log, buffers them per transaction, and applies each committed transaction to Snowflake in commit order. Rows land through Snowpipe Streaming into a change table and are merged into the target on a short, configurable interval.
Does PostgreSQL to Snowflake replication need triggers or capture tables?
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No. TwinCommit reads the PostgreSQL log directly and creates no objects in the source database.
Is PostgreSQL to Snowflake replication exactly-once?
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Yes. TwinCommit commits its checkpoint in the same Snowflake transaction as the data, so a crash or restart never loses or duplicates a transaction.
What PostgreSQL versions are supported?
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PostgreSQL 13–18 · Amazon RDS and Aurora · Azure Flexible Server · Cloud SQL · AlloyDB.
Stream PostgreSQL to Snowflake today.
Download the free Developer edition, or have one of our replication engineers walk you through a migration plan.