MariaDB to Oracle
real-time replication
TwinCommit replicates MariaDB to Oracle Database 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 Oracle with zero downtime, with no triggers or capture tables on the source.
MariaDB
log reader
commit-ordered · exactly-once
Oracle
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 Oracle
Array-bound MERGE statements committed together with the TwinCommit checkpoint table in one transaction.
Requirements
- ✓ARCHIVELOG mode
- ✓Minimal plus primary-key supplemental logging
- ✓Read access to V$ views and the archive destination
Setup
Set up MariaDB → Oracle 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 Oracle
Add a target block for Oracle. 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: oracle
dsn: ${ORACLE_TARGET_DSN}
schema: REPLICA
tables:
- source: SALES.ORDERS
- source: SALES.ORDER_LINES
exclude_columns: [INTERNAL_NOTES]MariaDB to Oracle replication FAQ
How does TwinCommit replicate MariaDB to Oracle?
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TwinCommit reads changes from the MariaDB transaction log, buffers them per transaction, and applies each committed transaction to Oracle in commit order. Array-bound MERGE statements committed together with the TwinCommit checkpoint table in one transaction.
Does MariaDB to Oracle 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 Oracle replication exactly-once?
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Yes. TwinCommit commits its checkpoint in the same Oracle 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 Oracle today.
Download the free Developer edition, or have one of our replication engineers walk you through a migration plan.