Folks,
I have created bunch of sequences in DB2 7.2.
How do I list all the defined sequences and if possible their current values?
Thanks.
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Hi Hemant, How do I list all the defined sequences and if possible their current values?
select *
from syscat.sequence s;
Should give you everything you need to know about the sequences.
Christian.
You can get the list of sequences from syscat.sequence s however
There is no way to get the current value of the sequence unless you
have already updated it in the current session.
To get the next value for a sequence :
VALUES NEXTVAL FOR <seq-name>
To get the last value for a sequence:
VALUES PREVVAL FOR <seq-name>
The PREVVAL command won't give you the correct answer unless you have
already accessed (and thus incremented) the sequence in your current
session using the NEXTVAL command.
Thanks
Amit
singleton at canada.com ch************* *@techie.com (Christian Maslen) wrote in message news:<b9******* *************** ****@posting.go ogle.com>... Hi Hemant,
How do I list all the defined sequences and if possible their current values?
select *
from syscat.sequence s;
Should give you everything you need to know about the sequences.
Christian.
If you dig deeper into SYSIBM.SYSSEQUE NCES there is a field containing
the next batch to be allocated for the cache.
Two cave-at:
1. SYSIBM.SYS* is undocumented on purpose. These tables may change
without warning on any full release upgrade.
2. This value is really just an upper boundary. While you know the
highest generated values so far was in the preceeding CACHE range, In an
MPP system may thow soem really old values at you from a node that works
of an old cache.
Note that sequences are a performance feature. The only way to get more
acurate is to use NO CACHE. But you will feel the impact.
Cheers
Serge
--
Serge Rielau
DB2 SQL Compiler Development
IBM Toronto Lab
While stranded on information super highway Christian Maslen wrote: Hi Hemant,
How do I list all the defined sequences and if possible their current values?
select *
from syscat.sequence s;
Should give you everything you need to know about the sequences.
Christian.
Thanks. I will try that.
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