MySQL to PostgreSQL
real-time replication
TwinCommit replicates MySQL to PostgreSQL in real time by reading the MySQL transaction log and applying every committed change exactly once and in commit order. Use it to migrate or continuously mirror MySQL into PostgreSQL with zero downtime, with no triggers or capture tables on the source.
MySQL
log reader
commit-ordered · exactly-once
PostgreSQL
native writer
How capture works on MySQL
TwinCommit connects as a replica, reads the row-based binary log and tracks position by GTID, so failovers and replica promotions are seamless.
Prerequisites
- ✓binlog_format = ROW and binlog_row_image = FULL
- ✓GTID mode recommended
- ✓REPLICATION SLAVE and REPLICATION CLIENT grants
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 MySQL → PostgreSQL in four steps
- 1
Prepare MySQL
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: mysql
dsn: ${SOURCE_DSN}
server_id: 4201
target:
type: postgres
dsn: ${PG_DSN}
tables:
- source: SALES.ORDERS
- source: SALES.ORDER_LINES
exclude_columns: [INTERNAL_NOTES]MySQL to PostgreSQL replication FAQ
How does TwinCommit replicate MySQL to PostgreSQL?
+
TwinCommit reads changes from the MySQL 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 MySQL to PostgreSQL replication need triggers or capture tables?
+
No. TwinCommit reads the MySQL log directly and creates no objects in the source database.
Is MySQL to PostgreSQL replication exactly-once?
+
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 MySQL versions are supported?
+
MySQL 5.7, 8.0, 8.4, 9.x · Amazon RDS & Aurora MySQL · Azure Database for MySQL · Cloud SQL.
Use cases for this route
Related replication routes
Stream MySQL to PostgreSQL today.
Download the free Developer edition, or have one of our replication engineers walk you through a migration plan.