Node affinity - a feature with an overload high; need scalable alternative

We have recently moved to CARS on Exadata. It has a behavior in architecture, I think it's hard to scale, hard to get the right and expensive to maintain, but I hope I'm just something missing.

THE DESIGN OF THE ORACLE

The recommendation of Oracle Consulting is to use "node affinity" as follows:

-DML can cause a lot of cross-node traffic if some of the parallel slaves are on a single node and some are on another.

-To prevent this traffic, pin any particular work of DML by one node. For example, the DML has a degree of parallelism of 16, all parallel slaves would run on, say, node 6, having thus no traffic cross-node.

-Facilitate this by using 'services '. For a service given DML, the service will use a single node.

-Note that this is not that all the DML on the server has to go to a node; just as for any DML session, this session would use a particular service. Thus, for example, if we have 8 knots, we would have 8 services DML with each pinning one by one. Then the DML jobs would use 8 services according to the needs.

In principle, this can always use the complete machine until we send an equal number of jobs in each of the eight nodes or services. So we have full use of the machine and no problem inter-nodes.

THE REALITY

In practice, it actually produces a very bad result. Here's why:

-It is essentially manual load balancing. In other words, he must constantly monitor the load on the nodes to ensure that they are used effectively.

-If a node is get overwhelmed because we're not constantly look or have more value to the company, this node will begin to downgrade or serialize queries (pre 11 g R2) or queue of these statements (11 g R2). Whatever it is, the performance degrades.

-Meanwhile, the other nodes go underused. In other words, even while the overwhelmed node gives disservice to those pinned to it, nodes sitting idle underwhelmed, leaving the CPU power and i/o to get lost.

-To remedy this situation, we need the intervention of expensive staff. One is the DBA which, as mentioned, must look at that and the discovery, must analyze and make recommendations on how to fix it.

-Need the intervention of users of staff or power application - one who sends the DML jobs. They have to connect to the services, and if things are out of balance, they have to change their workflow to connect to various services.

SOLUTIONS POSSIBLE

My thoughts on solutions:

(1) tell me what I'm missing. What this architecture far from terrible? Is there a better way, or I am simply wrong, please let me know.

(2) here is what I think would be the best fix:

-Instead of a service to a single node of pinning, leave the pin to someone one of several nodes, such as for a single request DML, it would be on a node.

It is:

-The service of the DML is configured to use, for example 4 knots.

-A session is created on the service.

-The session shall submit the DML.

-The service will be PIN to one of its 4 nodes, keeping all the parallel slaves on a single node, but it can be one of the four nodes.

-If one of these nodes is very busy, it's good then it can pick up one of the other 3.

This would allow the two valuable points: he would pin them all a DML/session request to a node, but it would not be forced to use a single node.

(3) just a note: it seems that we cannot let just DML fly on all nodes, because it does not seem to slow down certain queries down and a bit.

(4) and we do want to resolve this issue on a case by case basis. I know that Oracle the documentation says you can do some stuff with joins or clusters or similar kinds. This is not suitable. We have 30 000 tables that we manage and hundreds of thousands of requests for information; We cannot go catching up to manage what I can easily see is done at a level of database (if the product can do and if I knew how!).

Thoughts welcome!

Published by: user2369423 on January 13, 2010 18:47

James,

PRODB1 and PRODB2 are instance names. The excerpt I mentioned, there is an excerpt the spfile (or pfile). If it's the spfile, you must prefix the name of proceedings in the settings; otherwise, it does not clear the settings for each instance. If you need to put something for all instances, you could precede a «*»

Now, that being said, there is no connection between what I described and service names. you set the service names as you would, for example a service called SERV1 load-balanced between the instances. When a user connects using service SERV1, he can go to two cases with equal probability (assuming that the listener load balancing). If it connects to PRODB1 and starts a degree 2 PQ, all his servants will be PRODB1 instance only.

Similarly, another user connects now using the same service SERV1, but it connects to the PRODB2 instance. When she begins a degree 2 PQ, all slaves will be pending only PRODB2.

So achieve you your goal of load balancing and also make sure the slaves and the coordinators of individual parallelized applications are limited to a specific instance only.

I hope this helps.

Arup

Tags: Database

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