DB face memory pressure and need more memory?

Hi all

DB: 10g and 11g

Need your advice.

We provide the server db use memory and cpu management report on monthly basis.

Average usage of memory the server is more or less the same each month that memory allocated to oracle is capped (for example, memory_target).

Therefore, we will not be able to tell if the memory allocated to the sufficient DB and when does more memory?

We are required to provide a usage report to show that the memory allocated to the database itself is enough on monthly basis and does not need to bulk up.

Is there a good way to provde this?

Our DBs are all OLTP and rarely do full scan.

First thought to provide the trend of BHCR (above 90%, this means memory is sufficient). Read a large number of documents that BHCR is no longer useful.

A better way to do it? Kindly share your experiences.

Thank you

You can keep in mind what the different parts of the memory. The SGA is a shared resource, which includes the areas of code and data, and even those who can interleave in pressure of circumstances. The PGA is determined by the use of the users. The trend of the latest versions of Oracle is spending more major requests for data at the PGA, but which cannot affect you much if you're like really OLTP, as you describe (which one silent report or batch could blow). So really, after getting the right CMS, the PGA is more likely to be affected by the increase in the number of users. Mechanisms of the target to be fairly stable systems (as well as assignments of similar resources carried out by reasonable operating systems) translated well enough glancing SGA and PGA advice and after it.

Using the resources on a system close to their means of amount maximum, there are times when performance will go downhill fast, simply because of a resource to bite. (For a good time in mathematics, see the white paper to think clearly on Cary Millsap's performance.) These types of problems can come from many sources, if a regime change, hardware malfunction or a simple increase in its attendance. Those who dance near the line will inevitably have to step on it, or some such maxim comes from jurisprudence.

So the desire of the management of the Non-becassine-hunt is to anticipate and avoid such problems without too much purchase hardware or compulsive, disorder of tuning. The idea is to make an analysis of trends which allows to predict that an increase in its attendance will make things down a steeply, to do what is necessary to avoid it (or at least expects).

Oracle has a report to do this? Not really. There are too many variables and too many ways to use and abuse a system. Most performance problems are SQL issues.

What you can do is to simulate accurately the workload on a test system, increasing its failure. This as an exercise in iterative parameterization can give a good idea of what settings are required in order to maximize what you can use and an idea what kind of use will start demanding more material. For a well designed system, it can be as simple as looking at the number of users and uses of the pga.

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DB face memory pressure and need more memory?

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