Memory issue, Oracle 10g in Solaris 10 zone

I know many memory questions have been asked, but I couldn't find any similar to the problem I'm seeing.
Starting from a fresh server boot, I have 12G of available memory, or nearly that anyway. Oracle 10g is installed with no databases created.
After creating a database and running a few sql scripts to create tablespaces and users, my available memory is down to 3.5G.
Rebooting the solaris zone containing Oracle does not restore any available memory. Shutting down the database does not restore any available memory.
Why does Oracle seem to absorb so much available memory and not release it? I created the database from scripts and restricted the overall sga by a good bit over the defaults and while this did reduce the memory the oracle processes use, I'm still seeing this continual absorption of memory to the point where running any imports takes forever because my memory seems to bottom out. I saw it go down (using top, and vmstat) to about 500M at one point.
Is there any utility that I can use, either solaris or sqlplus that will free up system memory?
Message was edited by:
tsmori

After creating a database and running a few sql scripts to create tablespaces and users, my available memory is down to 3.5G.
What are your settings fpr SGA_MAX_SIZE, SGA_TARGET and PGA_AGGREGATE_TARGET?
Shutting down the database does not restore any available memory.
Hmm that's really strange. We are running Oracle 9i on Solaris 10 Containers and didn't have any problems with memory leaks.
Dim

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