Query always very quickly even after DB restart!

Hello
I have a static table t1 which made 1.5 million, I start my db and make
Select / * + FULL (t) * / count (*) t t1;

It takes 1 min,
can I do

stop immediately;
start-up;
Select / * + FULL (t) * / count (*) t t1;

I take 6 seconds! It should take 1 min?

If I reboot the server, I t took 1 min
I'm on 10.2.0.4
Linux (OEL 4.8) 2.6.9 - 89.0.0.0.1.EL

Is oracle, always dependd on memory cache level linux, even if it is bounced?

We do not know what file system you are using or what kind of framework of storage, but there is a very good chance the file system or storage subsystem is cached the results in memory.

This seems in line with your experience, because the initial 1 minute response time could be the real physical reads from the disk and the file system later fast response time / storage system cache. Oracle is not aware of this cache and made the same call independently.

HTH!

Tags: Database

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