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Don Burleson Blog 









Oracle Bi-directional Streams replication

Oracle Database Tips by Donald Burleson

There are several tools offered by Oracle to provide high-availability with RAC being the premier tool, Data Guard on the low-end, and Oracle Streams replication, an exciting new alternative to multimaster replication. 

See thus step-by-step guide to two directional Oracle streams replication.

Many shops are now employing bi-directional Oracle Streams replication to provide a live standby database with great success.  Multi-directional Streams replication provides some of the benefits of RAC:

  • High Availability - Just have multiple application icons that connect to each server.  If one is down, end-users just click the other database.

  • Disaster Recovery - Bidirectional Streams replication can work on servers that are hundreds of miles apart, providing easy disaster recovery.

  • Low cost - Multidirectional Streams replication has less configuration costs than RAC and it's free with Oracle Enterprise Edition.

Multi-directional Streams replication is not for everyone, but it's a fantastic alternative to RAC or Data Guard for specific types of shops:

  • Low volume updates - High volume update systems may be better using RAC as the replication queues can get backed-up.  Here is my benchmark on bi-directional Streams replication, showing the replication volume limits for small Linux server.

  • Low bandwidth interconnects - Oracle RAC can drop nodes with slow interconnects

There are some special considerations when using multi-directional Streams replication but they are easily overcome:

  • Shared components - Shared components (sequences) must be made unique on each database.  This is a simple procedure whereby bidirectional Streams replication uses an even-odd numbering scheme.  See Oracle Streams Replication Sequence Number Verification.

  • Error Checking - Scripts need to be employed to ensure that any network-related replication errors are quickly addressed.

Getting started with multidirectional Streams replication

There are many "gotchas" in implementing multimaster Streams replication and you may want to consider using a consultant who has successfully implemented this complex technology.

Just call and we can provide Oracle Certified DBA's with experience in bi-directional replication to ensure your success.


My related Notes on multimaster Streams replication include:

If you like Oracle tuning, you may enjoy my new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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