How to get maxvalue of sequence in table

hi,
i have made a sequence to be used for an ID column of a table as a primary key. now this sequence is incremented by one,, suppose the maxvalue in this column is 5,,and i want to store next row with ID = 6,,and the statement rollbacks or failed due to any other reason,,the value of 6 has gone,,and nextval would be 7,,how can i get my ID column as an autoincrement such as Autonumber in MS SQL Server ,,is there any other technique available in Oracle??
onetechnique is this tht we get maxvalue of the column thru query and then ourself increment in it,,but this is not a sophisticated way,,
any suggestion would be highly appreciated.
Regards
Muhammad Umar Liaquat.

By definition, you cannot guarantee that values in a sequence generated column are gap-free. There are a number of different things that can cause gaps, including rollbacks.
Is there a legitimate business reason that you want a gap-free sequence of values? 99% of the time, this sort of request has no real justification. If there is a justification, the underlying problem can be solved by adding rownum or dense_rank() to a view on the data for the business users to query.
If you do need gap-free sequences, you have to serlialize transactions-- only one transaction at a time can get an ID. This is obviously a scalability killer.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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krughan wrote:
> Hi pixlor :)
> pixlor maybe im missing the bigger picture and there is
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> or maybe its due to my understanding of english.
>
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> (maybe im doing something wrong here. am i ?)
>
> pixlor, by no way am i being confrontational with you in
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>
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me know
> or provide me with a link to reference(s)
>
> thank you again for responding. your input means alot to
me
>
> Thanks
> k
>
>
>
>
This kind of complexity would be much better handled via
Flash, but that
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The code you saw was NOT generated by Firefox; it was the
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by Fireworks to pull off the effect you wanted. The lag you
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Firefox having to parse and display all the elements
Generally, overlapping slices is not a good idea for many
reasons -
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are
unreliable image display, multiple - unnecessary - sliced
images and
migraines from having to edit the code at the source level
<grin>.
Jim Babbage - .:Community MX:. & .:Adobe Community
Expert:.
http://www.communityMX.com/
CommunityMX - Free Resources:
http://www.communitymx.com/free.cfm
.:Adobe Community Expert for Fireworks:.
Adobe Community Expert
http://tinyurl.com/2a7dyp
See my work on Flickr
http://www.flickr.com/photos/jim_babbage/

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