Re: FILE SIZING

2001-12-07 Thread Jared . Still 




1)  In our testing environment log file switch is occuring every 2 minutes.
The size of log files is 100M .
 What shold be the size of log files in Performance testing ---  500M
or
1G . Is there any drawback in using large
 size of log files. For performance testing we will be running in
noarchive log mode.

1 gig should work fine.  You may want to set log_checkpoint_timeout to a
a value to force a checkpoint every 20-30 minutes during periods of
inactivity.

-

2)  Two of our table sizes is 175G and 160G. We are partitioning both the
tables into 10 partitions. What should be the
 ideal datafile size and initial extent size. Is there any drawbacks in
using big datafiles. We always used about 2G
 file size for small databases.

128 Meg extents would work nicely.  That's only about 150 extents per
partition.

--

3)  We will be using locally manages tablespaces . which option is better
for large database Uniform size or Autoallocate.

Personally I prefer uniform size. no chance of fragmentation, which can
be an issue with large extents.

Jared



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RE: FILE SIZING

2001-12-07 Thread Jesse, Rich 

If you're testing performance, wouldn't you want your test environment to
mirror what production would look like?  I would think that a performance
test of a 
NOARCHIVELOG db would have limited validity for an ARCHIVELOG mode
production, especially with 100M log switches every two minutes.

My $.02  :)

Rich Jesse  System/Database Administrator
[EMAIL PROTECTED] Quad/Tech International, Sussex, WI USA

-Original Message-
Sent: Friday, December 07, 2001 08:55
To: Multiple recipients of list ORACLE-L


Hi,


We never worked on large databases but we have to test our application for
scability and performance test.
It will be great if DBA handling large databases give some input on
following :
Environment is 9i on SUN 2.8. Database size will be about 375G.
 
1)  In our testing environment log file switch is occuring every 2 minutes.
The size of log files is 100M .
 What shold be the size of log files in Performance testing ---  500M or
1G . Is there any drawback in using large
 size of log files. For performance testing we will be running in
noarchive log mode.
2)  Two of our table sizes is 175G and 160G. We are partitioning both the
tables into 10 partitions. What should be the
 ideal datafile size and initial extent size. Is there any drawbacks in
using big datafiles. We always used about 2G 
 file size for small databases. 
3)  We will be using locally manages tablespaces . which option is better
for large database Uniform size or Autoallocate.

Thanks
--Harvinder
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jesse, Rich
  INET: [EMAIL PROTECTED]

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