Reducing oracle data file sizes to a bare minimum

Hi,
How can I create an oracle instances with minimal file sizes ?
Using the database configuration wiz, i've specified 10~20mb sizes for SYSTEM01, UNDOTBS01 etc. but when the instance is created the files were still huge :
SYSAUX01 was 83MB,
SYSTEM01 was 256MB
UNDOTBS01 was 158MB
The only files that seems to have complied were the redo log files.
It's a testing environment that's constantly restored so i'm trying to fit the files into a ram-disk (using imdisk) in favour of performance.
The data required/created by each test is not large and because it's only a testing db reliability/consistency is not an issue - rollbacks are also minimal (i've set the retention at 15 secs so far)
So if anyone can shed some light on how to keep filesizes to a minimal, I'm all ears.
If there's a way to run without some of these files, i'm keen to hear too =)
Thanks

So if anyone can shed some light on how to keep filesizes to a minimal, I'm all ears.
SQL below works.
reduce SIZE value & see what works for yourself
spool V888.log
set term on echo on
startup mount;
CREATE DATABASE "V888"
    MAXLOGFILES 16
    MAXLOGMEMBERS 3
    MAXDATAFILES 100
    MAXINSTANCES 8
    MAXLOGHISTORY 292
LOGFILE
GROUP 1 '/u01/app/oracle/product/10.2.0/oradata/V888/redo01.log' SIZE 50M,
GROUP 2 '/u01/app/oracle/product/10.2.0/oradata/V888/redo02.log' SIZE 50M,
GROUP 3 '/u01/app/oracle/product/10.2.0/oradata/V888/redo03.log' SIZE 50M
EXTENT MANAGEMENT LOCAL
SYSAUX DATAFILE '/u01/app/oracle/product/10.2.0/oradata/V888/aux88801.dbf'
     SIZE 20971520 REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M
DEFAULT TABLESPACE USERS DATAFILE
'/u01/app/oracle/product/10.2.0/oradata/V888/system01.dbf'
     SIZE 20971520 REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M
DEFAULT TEMPORARY TABLESPACE TEMP888 TEMPFILE '/u01/app/oracle/product/10.2.0/or
adata/V888/temp88801.dbf'
     SIZE 20971520 REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M
UNDO TABLESPACE UNDO888 DATAFILE
'/u01/app/oracle/product/10.2.0/oradata/V888/undo88801.dbf'
     SIZE 20971520 REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M
CHARACTER SET AL32UTF8
NATIONAL CHARACTER SET AL16UTF16
spool offBut WHY are you doing so?

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Ben Daniels wrote:
Hi all,
>
> Creating a new system (SolMan 7.1) on AIX 6.1 running Oracle 11.
>
> I have 4 logical volumes for data sized at 100gb each. During the installation I'm being asked to input the size for the data files. The default is "2000mb/2gb" is this acceptable for a system sized like mine, or should I double them to 4gb each? I know the max is 32gb per data file but that seems a bit large to me. Just wanted to know if there was a standard best practice for this, or a formula to use based on system sizing.
>
> I was not able to find any quick suggestions in the Best Practices guide on this unfortunately...
>
> Any help would be greatly appreciated.
>
> Thanks!
Hi Ben,
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Reducing oracle data file sizes to a bare minimum

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