Oracle Timesten Geo-redundent architecure deployment queries

Question

Hi,
We have 6 sites and each site connect with lease line.
There are 5 different physical Remote Site we want to deployed the active/standby timesten database on 5 sites
We want to create the READ ONLY LOCAL CACHE GROUP for each 5 Sites which is auto refresh from single central database site(2-Node RAC)
Data Modification always happen on Central Site.
Oracle timesten active/standby is in local LAN on each site but each site is connect through WAN to the Central Local site where the Oracle RAC Database resides
and configure the Cache Connect with each site for Auto refresh the Read Only Local Cache Group on each site.
ARCHITECTURE OVERVIEW
Remote Site Location-1 ==>(Read Only Local cache Group )Oracle TT A/S<<====== Auto Refresh <---------||
||
Remote Site Location-2 ==>(Read Only Local cache Group )Oracle TT A/S<<====== Auto Refresh <---------|| (CENTRAL LOCATION SITE)
||
Remote Site Location-3 ==>(Read Only Local cache Group )Oracle TT A/S<<====== Auto Refresh <---------|| (2-Node RAC Database)
||
Remote Site Location-4 ==>(Read Only Local cache Group )Oracle TT A/S<<====== Auto Refresh <---------||
||
Remote Site Location-5 ==>(Read Only Local cache Group )Oracle TT A/S<<====== Auto Refresh <---------||
We have go through below Oracle Technical Paper.
http://www.oracle.com/technetwork/database/performance/wp-imdb-cache-130299.pdf
please check the Figure 7==>Incremental Autorefresh of Read-Only Local Cache Groups
Please suggest your advice and suggestion for above architecture deployment
Regards
Hitgon
Edited by: hitgon on Jul 10, 2012 6:44 PM
Edited by: hitgon on Jul 10, 2012 6:46 PM

Answer 1

There is a great deal of stuff you need to understand and bear in mind when implementing any complex system and this is n oexception. You should start by studying the TimesTen documentation. In particular you should familiarise yourself with the informaiton in the Cache User's Guide and the replication Guide. These contain lots of very important information regarding the setup/deployment and operation of A/S pairs and cache groups, configuring cache connect for RAC etc. You should also read through the troubleshooting guide to familiarise yourself with what things to look at if things do not seem to work as expected.
If you are not already very familiar with TimesTen I would also strongly recommed that you take the time to read the rest of the documentation. TimesTen is not Oracle Db and while it is very compatible with Oracle in many areas there are also a lot of significant differences which you need to take into account when developing applications, managing the system etc. if you are able to take an OU training course on Timesten then I would recommend that but if not then reading the documentation is a good second best.
We do not 'recommend' operating systems specifically but 64-bit Linux is certainly a good choice. You might like to consider Oracle Enterprise Linux instead of Redhat; it has some advantages.
Within each site both nodes in the TimesTen active/standby pair should be on the same LAN. I would recommend GigaBit ethernet as a minimum.
While it is possible to write your own scripts to handle deployment, monitoring, failover and recovery of A/S pairs it is much, much easier (and much more robust) if you deploy Oracle Clusterware at each site to provide fully automated management of the A/S pairs. That is our very strong recommendation and is also best practice.
From a TimesTen perspective, system clock synchronisation is only needed within each site (i.e. the system clocks on both nodes in an A?S pair need to be closely aligned). However, it may be desirable to have all the nodes in all the sites have their clocks aligned for other reasons.
You need to ensure that the bandwidth and latency of the WAN connections is adequate for the amount of refresh traffic that you will have. There is no easy way to estimate/calculate this; you will need to determine this empirically.
Those are probably the most important things. As you progress then you can of course ask questions in this forum and use Oracle Support.
Chris