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Home -> Community -> Usenet -> c.d.o.server -> Re: ------PLEASE HELP-------------
> 1) Redolog files - should it increase ?
Only if you notice 'Checkpoint not complete' messages in your
alert.log file.
> 2) Redolog buffers - Should it increase ?
Once again, it depends on what you get in statistics (V$SYSSTAT).
Compare 'redo log space requests' to 'redo entries'. Increase your
redolog buffers if its more than a few percents. Another indicator is
the ratio of 'redo writes' to 'redo sync writes' - above 2 I would
increase the redo log buffers.
> 3) Rollback segments - The records are always commited for every 100
> records. Whether should i increase rollback segments ?
You need probably not increase them in size, individually, but you
should increase their number by at least a factor 2. Look in V$WAITSTAT.
If you have a noticeable number of waits for 'undo header blocks' it
means you do not have enough rollback segments.
> Obviously I have to increase the size of the data file for the
> tablespace because of the number of records
> increased from 2 million to 6 million. Will the size of the data file
> for the
> database should be increased or automatically taken care ?
If you are running Oracle 7.2 or above, datafiles can be put in
'autoextend' mode - they will automatically increase in size when
required. I may be a little old-hat, but I am rather in favour of not
using this and allocating datafiles manually. I think that replacing an
Oracle 'Cannot allocate extent ...' message by a Unix 'file system full'
message is fudging rather than solving the problem. Better to estimate
volumes beforehand and monitor it 'inside' Oracle. Just ask your systems
engineer!
--
Regards,
Stéphane Faroult
Oriole Corporation
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