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PODBCC CHECKIDENT RESEED -- is new value required?
 

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    <p>All the documentation I read about reseeding suggests something along the lines of:</p> <ol> <li><code>SET @maxIdentityValue = (SELECT MAX(id) FROM tablename)</code></li> <li>run <code>DBCC CHECKIDENT('tablename', RESEED, @maxIdentityValue)</code></li> </ol> <p>And <em>yet</em> it appears to me that a simple <code>DBCC CHECKIDENT('tablename', RESEED)</code> is all that's needed, and it will automatically determine the correct identity value from the table without supplying a max value.</p> <p>Is there a reason (performance or otherwise) that extracting the value using <code>MAX</code> first is preferred?</p> <p>Piggyback question: the reason I need to reseed is because I'm using replication and identities keep getting set to Null each time the database replication runs. What am I doing wrong? How can I maintain the correct identity seed for each table?</p> <h2>Update (Current solution)</h2> <p>For now I'm not using the max value. This is the stored procedure I'm using (I generate it using a query on <code>sys.columns</code> and then just cutting and pasting each into a new query window. Messier, slower, less elegant, but I'm not very familiar with stored procedures and don't want to use dynamic SQL queries):</p> <pre><code>declare @seedval integer declare @maxval integer declare @newval integer set @seedval = (select ident_current('mytable')); set @maxval = (select MAX(id) from mytable); if @maxval &gt; @seedval or @seedval is NULL BEGIN print 'Need to reseed: max is ' + cast(@maxval as varchar) + ' and seed is ' + cast(@seedval as varchar) dbcc checkident('mytable', RESEED); set @newval = (select ident_current('mytable')); print 'Max is ' + cast(@maxval as varchar) + ' and seed is ' + cast(@newval as varchar) END ELSE print 'No need to reseed'; </code></pre>
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    1. USJordan Reiter
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    1. CODid you test that this works? I did this recently and I was forced to use the work-around.
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    2. COYeah, for some reason it worked for me. Correctly identified `31` as the maximum value and set the identity to that.
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    3. COAh, the accepted answer contains the reason why it did not work for me. I wanted to *decrease* the current value. Not possible for some reason.
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