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Dude, Where's My Database?

Charlotte Hammond

2006-07-18

Replies:

Hi All,

My database is configured to use approx. 4Gb of
memory:

Connected to:
Oracle9i Release 9.2.0.6.0 - 64bit Production
JServer Release 9.2.0.6.0 - Production

SQL> select *
2 from v$sga
3 /

NAME               VALUE
-------------------- ----------
Fixed Size          748656
Variable Size      805306368
Database Buffers   3355443200
Redo Buffers        1323008


Yet, Linux is saying there's < 1Gb physical memory in
use and no swap. Where is my database?

(Apologies for the formating)

top - 16:08:21 up 2:17, 4 users, load average:
0.12, 0.11, 0.04
Tasks: 102 total,  1 running, 101 sleeping,  0
stopped,  0 zombie
Cpu(s): 0.4% us, 0.1% sy, 0.0% ni, 99.3% id, 0.2%
wa, 0.0% hi, 0.0% si
Mem:  8169180k total,  906124k used, 7263056k free,
 39152k buffers
Swap: 2031608k total,     0k used, 2031608k free,
742984k cached

The database has been up for 2 hours but is very
lightly loaded. Linux version is:

Linux 2.6.9-34.0.1.ELsmp #1 SMP Wed May 17 16:59:36
EDT 2006 x86_64 x86_64 x86_64 GNU/Linux

Doesn't Oracle allocate the entire SGA at start-up (or
is on a demand basis?) I'd always understood it to be
the former, in which case why can't I see it in memory
using top?

Thanks for any info

Charlotte


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