Some doubts about 11g R2 Policy Based/Scan

Hello

I went through several documents, including the help of Oracle to understand oracle new feature Policy Based management/Scan, I also explored a few RACSIG Webinar by Markus which were useful, but still not able to understand the concept. I will be grateful if someone can help me understand the concept if you please.

Written document - the advantage of the creation of a pool of servers (policy) is to manage the workload automatically. I do not understand how it will manage the workload automatically. I understand according to importance and setting min/max, the servers will allocate/deallocate pools as a result.

For example - is a server pool: high_priority pool with min 2 servers. first and foremost, he is serving 2 instance of database on payroll
another pool of servers: low_priority pool with min 2 servers with low priority, he is serving 2 HR database instance

In this case, any expelled obtained high_priority server, it should take only one low_priority server. (That's what expression I so far after going through the documentation. Please correction if I'm mistaken).

1st question: doest which means that he's going to stop a case of HR running on low_priority pool and will allocate for this server at high_priority
and as a result instance payroll goes up.

2nd question: can still reach TAF feature using server pools. That is, I read that I can have a uniform service that runs on all instances
(I guess that means favorite)... or the service can run on any single server (singletone)


question 3: feature with SCAN, where we put remote_listener = SCAN_LISTENER, and clients will connect first to the SCAN and then had diversion to local listener.
What is the advantage to have VIP for each node. SCAN listener knows which instance is in place, which is the less loaded can connections directly to the front
local listener. (we can start using public ip for listener)

my doubt is: 10 g, we only used vip to get quick notification or avoid tcp timeout... and then we got to redirect to some other listener/node to connect
now SCAN can do the same features...

Thank you in advance, I thank your time.

Kind regards
Lyxx

Hello

In this case, any expelled obtained high_priority server, it should take only one low_priority server. (That's what expression I so far after going through the documentation. Please correction if I'm mistaken).

Yes, that is the correct hypothesis.

1.) Yes. The instance of database that HR will be stopped and a third instance of payroll will start.
2 TAF.) will work for uniform and singleton services. However if you don't have 1 server in the serverpool (or have a singleton service) that there is no sense to work with preconnect.
Note: TAF time varies based on uniform/singleton service and needs if service failover will need time so that it starts an instance. If you must configure TAF for such services with new higher attempts.
(3.) the SCAN will redirect the customer to use the VIP for the final sign in the local listener. If it would use the public IP address and the server fails in exactly this moment, the client would wait for the TCP/IP timeout (which may take some time).
With the VIP, he will tell him immediately, report that its connect has been unsuccessful and rerun the ANALYSIS to get a new connection.

While the SCAN done the same thing in case of a change of itinerary as the VIP there 2 advantages:
a.) no matter what your cluster, you must always 3 SCANs.
(b) and they stay the same, no matter if the cluster has changed. (The VIPs are).

Concerning
Sebastian

Tags: Database

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