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UPDLOCK implications
To try to resolve deadlocks in my DB, as per recommendations in BOL and MSDN, I'm going through my transactions, and, in cases where they:
1. select rows from a deadlocking table
2. do lots more processing within the transaction
3. then do updates on the same table before ending the transaction
I am proceeding to add the 'UPDLOCK' and 'ROWLOCK' hints to the select statements. This seems safe enough to me, in the sense that as the DB normally operates at the default level of Read Commited, I don't think any functionality will be affected.
However...
I've now come to a case like in 1...2..3 above, where the original developer has added a (HOLDLOCK) hint to the select statement I was going to use (UPDLOCK, ROWLOCK) with.
Points go to the person who tells me IN PLAIN ENGLISH what the data integrity implications would be of changing the current
"select blah from blah WITH(HOLDLOCK)"
to
"select blah from blah WITH(UPDLOCK, HOLDLOCK)"
and to
"select blah from blah WITH(UPDLOCK, HOLDLOCK, ROWLOCK)"
in my transaction, bearing in mind there's loads of concurrency, with other users and apps reading and updating the same table constantly.
Thanxb4
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