What happens if I have made my VERY large db cache?
JinIf I had 256G of RAM, and I allocated say 200G in my cache of database (and 50G for other stuff) and has managed to fill the whole 200G of data blocks, so if I have many data blocks in the buffer you are looking for the right one will start taking too long and I would start losing benefits?
Thank you
jgarry wrote:
Somehow, I have the idea that on a system that has a lot of competition but also updates, you could get in a situation where the CPU is so related to the it would be actually better than a little rinse em, for disk i/o can be parallel with CPU and let the CPU to do other things.I know I've seen this with some configurations of temporary tables that do not fit.
Also, in the previous Oracle cache chaining and other versions could make a difference as you would actually reduce the SGA for the performance, but I agree the modern versions usually manage better.
Of course, there is the gross error do not leave enough memory for the things of the user to run... it depends!
I totally agree with you. The point I was trying to make was that the various problems that huge CMS can cause I was talking at the start, some disappear if the entire database is stored (look for a block in the SGA that is not here and should be read from disk anyway) so that other operations (such as lock contention and looking dirty blocks) are not affected.
Justin
Tags: Database
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