Solved

Limited distance between 2 nodes in a cluster using Oracle RAC 11gR2

Posted on 2010-11-16
3
759 Views
Last Modified: 2012-05-10
Hi,
My company are buying a multimedia content management system. We want to deploying it on 2 sites (their distance = 1500km) and want to sync database between them. Each site is a complete system that can work without other site. The system requirement for database on this system is Oracle RAC 11gR2. I find some info on google which said that 2 nodes in a cluster must be < 100 km but i can't verify this.
If this info is true, is there other solution else to synchronize database between 2 or more very far sites ?
Oh, the most important thing i want to know is limited distace between 2 nodes.
Thx
0
Comment
Question by:dash1986
3 Comments
 
LVL 76

Assisted Solution

by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 167 total points
ID: 34146915
Since RAC shares a disk sub-system you would need some disk management what could span this distance in a pretty efficient manner.  That is likely the limiting factor.  It also needs a quick heartbeat interconnect.

As far as a remote sync I would look at streams replication or if one of the remote databases can be read-only, take a look at active dataguard.
0
 
LVL 11

Assisted Solution

by:jgiordano
jgiordano earned 167 total points
ID: 34147264
Oracle RAC is very sensitive, From experience if the cluster has issues with the interconnect they will recommend that all nodes connect to the same switch. You may have failover interconnects going to a different switch but all primaries should be on the same switch and all failover interconnects should be on the same switch. Also they recommend a 1g minimum connection.
0
 
LVL 8

Accepted Solution

by:
ReliableDBA earned 166 total points
ID: 34149667
Oh, the most important thing i want to know is limited distace between 2 nodes.
  => One thing i can recommend is, make sure that ping time between/among the RAC nodes is less than 25 milliseconds.  Usually, in all RAC implementations, we see this to be less than a milli second.  :)
Hope that answers your question about the distance.

Another piece of note:
Despite the all RAC nodes being in the same data center, many times we had to increase the CSS timeout from its default 60 seconds to avoid node evictions.
As jgiordano said, RAC is very sensitive.


0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This post first appeared at Oracleinaction  (http://oracleinaction.com/undo-and-redo-in-oracle/)by Anju Garg (Myself). I  will demonstrate that undo for DML’s is stored both in undo tablespace and online redo logs. Then, we will analyze the reaso…
This article explains all about SQL Server Piecemeal Restore with examples in step by step manner.
This video explains at a high level with the mandatory Oracle Memory processes are as well as touching on some of the more common optional ones.
This video shows how to Export data from an Oracle database using the Datapump Export Utility.  The corresponding Datapump Import utility is also discussed and demonstrated.

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now