RAM always used 100 %

 
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Operating Systems Linux Red Hat RAM always used 100 %
# 8  
Old 08-13-2012
As everyone said, If you have Oracle, then 4GB for the server is not enough. It "could" have been enough without Oracle, though! Increase memory. Smilie
# 9  
Old 08-22-2012
Quote:
Originally Posted by Neo
I agree with this. RAM is cheap; cheaper than hours of analysis.
Isn't that just throwing money at the problem rather than fixing it? What's to say that the memory they put in there isn't just going to be eaten up once it's available? That's like saying the solution to a full root filesystem is always more space. If an admin doesn't know enough about the internal architecture of their application, then they need to go out and learn it. Once you've gotten to the point of "There's no more resource optimization left to do and I know it for sure." then you're at the point where you just flat out need more memory. Even then I wouldn't phrase it as being a crutch, at that point you're just solving the problem the only way possible.

Slightly related example, where I work disk space for the Domino servers was nearly completely exhausted and the admin for the system kept telling everyone that we were heading for a cliff if he didn't get more space allocated from SAN. Well he gets a contractor to come in and turns out that many people have three or four different replicas of the same files, including people who haven't even worked there in years. Now the Domino Admin knows more about Domino, and can better contribute value elsewhere, the databases run more efficiently with quicker backup times, and we managed to avoid having to pay for more disk space than was actually needed. If he had settled for "disk space is cheap" then the problem wouldn't have been uncovered.

Point being that you shouldn't knowingly use something as crutch and then let yourself be surprised by the results down the road.
# 10  
Old 08-22-2012
Quote:
5. No Kernel parameters changed.
Sorry to be blunt, but please read the installation instructions from Oracle. You must tune the kernel.

Please also post the contents of init<sid>.ora file(s) from your system. A common issue is to not realise that the units of memory parameters in this file are in Blocks. Thus if your Block Size is say 8 Kb, you can accidentally allocate eight times your available memory to the Oracle SGA.

Hope this helps.
# 11  
Old 08-23-2012
Quote:
Originally Posted by thmnetwork
Isn't that just throwing money at the problem rather than fixing it?
If the problem is "not enough memory", the solution is "more memory". It's certainly not the answer to every problem, but Oracle isn't small; if they say 4 gigs isn't enough I believe them.

How much does Oracle cost, versus a few more gigs of memory, anyway?
# 12  
Old 08-24-2012
Quote:
Originally Posted by Corona688
If the problem is "not enough memory", the solution is "more memory".
Can I get a reply to what I wrote? What I said in the post you're quoting is that until you know that you actually need more memory you need to do research, it's not exactly professional to say "Out of memory? Better install more memory, then." Because not all memory use is justified. I also explicitly said that it may come down to instaling more memory, but until you know that, you can't say that.

There could be a memory leak affecting them, there could be something misconfigured in their Oracle install, their specs for the this machine could have been way off, etc. For all we know if the OP slaps more physical memory in there it's just going to eat up that new memory and they're going to be back at square one only this time they have to explain to their boss why the fix they offered didn't actually fix the problem.

Quote:
Originally Posted by Corona688
It's certainly not the answer to every problem, but Oracle isn't small; if they say 4 gigs isn't enough I believe them.
It's not four gigs, I don't know where that number came from, their free output shows 11 gigs physical and 18 gigs swap. A swap that big probably also points to a technical deficit, BTW.
# 13  
Old 08-27-2012
Oracle databases do tremendous amounts of reads. Linux, in general, caches reads into memory. Unused memory is wasted. The disconnect here is one that people believe a system is supposed to behave a certain way and that may not always be the best case.

Forget how much memory is being used and ask whether performance is impacted. File system caching is dropped when an application uses the memory, but also, realize that keeping things in memory translates into faster lookups.
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