MySQL to SQL Server
real-time replication
TwinCommit replicates MySQL to Microsoft SQL Server 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 SQL Server with zero downtime, with no triggers or capture tables on the source.
MySQL
log reader
commit-ordered · exactly-once
SQL Server
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 SQL Server
Set-based MERGE into BIN2-collated tables with an in-transaction checkpoint.
Requirements
- ✓FULL recovery model
- ✓Primary key on each replicated table
- ✓VIEW SERVER STATE and db_owner on the source database
Setup
Set up MySQL → SQL Server 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 SQL Server
Add a target block for SQL Server. 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: sqlserver
dsn: ${MSSQL_DSN}
tables:
- source: SALES.ORDERS
- source: SALES.ORDER_LINES
exclude_columns: [INTERNAL_NOTES]MySQL to SQL Server replication FAQ
How does TwinCommit replicate MySQL to SQL Server?
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TwinCommit reads changes from the MySQL transaction log, buffers them per transaction, and applies each committed transaction to SQL Server in commit order. Set-based MERGE into BIN2-collated tables with an in-transaction checkpoint.
Does MySQL to SQL Server replication need triggers or capture tables?
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No. TwinCommit reads the MySQL log directly and creates no objects in the source database.
Is MySQL to SQL Server replication exactly-once?
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Yes. TwinCommit commits its checkpoint in the same SQL Server transaction as the data, so a crash or restart never loses or duplicates a transaction.
What MySQL versions are supported?
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MySQL 5.7, 8.0, 8.4, 9.x · Amazon RDS & Aurora MySQL · Azure Database for MySQL · Cloud SQL.
Stream MySQL to SQL Server today.
Download the free Developer edition, or have one of our replication engineers walk you through a migration plan.