Short answer - yes you could loose some numbers.
Have a look at http://www.ixora.com.au/scripts/library.htm and the
unload_sequences.sql and keep_sequences.sql which mention that you can lose when:
Shutdown abort is done
the sequence gets aged out of the library cache
The scripts suggest 2 ways to help avoid this.
If its really critical to never skip a number then maybe you shouldn't cache the
sequence.
But then again, if its that critical maybe you shouldn't use a sequence - eg what if
someone gets the sequence number and then does a rollback.
It is my understanding from a simple test that you will now have a "hole /
gap" in the sequence numbers.
So, does a gap REALLY matter (ie can you never have a gap) or is it just that you need
to avoid gaps where possible.
HTH,
Bruce Reardon
-----Original Message-----
Sent: Friday, 14 June 2002 11:23
Hi List ,
I want to create a sequence which will be used by some external process to generate
some unique number . since this sequence will be used very frequently I would prefer
to cache around 10000 numbers . Am I going to loose some numbers ?
what is SEQUENCE_CACHE_ENTRIES and how does it affect number or sequence cached ?
Thanks ,
-Bp
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Author: Reardon, Bruce (CALBBAY)
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