SAP HANA to PostgreSQL
real-time replication
TwinCommit replicates SAP HANA to PostgreSQL in real time by reading the SAP HANA transaction log and applying every committed change exactly once and in commit order. Use it to migrate or continuously mirror SAP HANA into PostgreSQL with zero downtime, with no triggers or capture tables on the source.
SAP HANA
log reader
commit-ordered · exactly-once
PostgreSQL
native writer
How capture works on SAP HANA
TwinCommit reads the SAP HANA redo log through a log-reader technical user and decodes row and column-store changes, with no triggers or shadow tables in your SAP schema.
Prerequisites
- ✓log_mode = normal
- ✓Technical user with LOG ADMIN and CATALOG READ
- ✓Primary keys on replicated tables
How apply works on PostgreSQL
Binary COPY into staging plus INSERT … ON CONFLICT, with the checkpoint in the same transaction.
Requirements
- ✓wal_level = logical
- ✓REPLICATION privilege
- ✓Primary key or REPLICA IDENTITY FULL
Setup
Set up SAP HANA → PostgreSQL in four steps
- 1
Prepare SAP HANA
Run twincommit check. It verifies log_mode = normal and the other prerequisites, and prints the exact fix for anything missing.
- 2
Point at PostgreSQL
Add a target block for PostgreSQL. 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: saphana
host: hana.internal:30015
user: ${HANA_USER}
password: ${HANA_PASSWORD}
target:
type: postgres
dsn: ${PG_DSN}
tables:
- source: SALES.ORDERS
- source: SALES.ORDER_LINES
exclude_columns: [INTERNAL_NOTES]SAP HANA to PostgreSQL replication FAQ
How does TwinCommit replicate SAP HANA to PostgreSQL?
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TwinCommit reads changes from the SAP HANA transaction log, buffers them per transaction, and applies each committed transaction to PostgreSQL in commit order. Binary COPY into staging plus INSERT … ON CONFLICT, with the checkpoint in the same transaction.
Does SAP HANA to PostgreSQL replication need triggers or capture tables?
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No. TwinCommit reads the SAP HANA log directly and creates no objects in the source database.
Is SAP HANA to PostgreSQL replication exactly-once?
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Yes. TwinCommit commits its checkpoint in the same PostgreSQL transaction as the data, so a crash or restart never loses or duplicates a transaction.
What SAP HANA versions are supported?
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SAP HANA 2.0 SPS05+ · SAP HANA Cloud · S/4HANA and BW/4HANA schemas.
Stream SAP HANA to PostgreSQL today.
Download the free Developer edition, or have one of our replication engineers walk you through a migration plan.