MariaDB to PostgreSQL
real-time replication
TwinCommit replicates MariaDB to PostgreSQL in real time by reading the MariaDB transaction log and applying every committed change exactly once and in commit order. Use it to migrate or continuously mirror MariaDB into PostgreSQL with zero downtime, with no triggers or capture tables on the source.
MariaDB
log reader
commit-ordered · exactly-once
PostgreSQL
native writer
How capture works on MariaDB
TwinCommit reads the row-based binary log as a replica using MariaDB GTIDs, and follows Galera cluster failover automatically.
Prerequisites
- ✓binlog_format = ROW and binlog_row_image = FULL
- ✓REPLICATION SLAVE and BINLOG MONITOR grants
- ✓log_slave_updates on Galera nodes
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 MariaDB → PostgreSQL in four steps
- 1
Prepare MariaDB
Run twincommit check. It verifies binlog_format = row and binlog_row_image = full 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: mariadb
dsn: ${SOURCE_DSN}
server_id: 4201
target:
type: postgres
dsn: ${PG_DSN}
tables:
- source: SALES.ORDERS
- source: SALES.ORDER_LINES
exclude_columns: [INTERNAL_NOTES]MariaDB to PostgreSQL replication FAQ
How does TwinCommit replicate MariaDB to PostgreSQL?
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TwinCommit reads changes from the MariaDB 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 MariaDB to PostgreSQL replication need triggers or capture tables?
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No. TwinCommit reads the MariaDB log directly and creates no objects in the source database.
Is MariaDB 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 MariaDB versions are supported?
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MariaDB 10.6, 10.11, 11.x · Galera Cluster · SkySQL · Amazon RDS for MariaDB.
Stream MariaDB to PostgreSQL today.
Download the free Developer edition, or have one of our replication engineers walk you through a migration plan.