If I understand correctly, when there is an attempt to modify a Ref
that has been modified in another thread since the current transaction
began then the current transaction will retry immediately. Isn't it
true that it has no chance of completing until the transaction that
changed that Ref either commits or rolls back? If that is true,
wouldn't it make sense to make the retry wait until that other
transaction is finished? Maybe the point of retrying immediately is
that it can at least get through some of its work (the part before it
tries to change the Ref in question) before it has to check on that
other transaction again.

-- 
R. Mark Volkmann
Object Computing, Inc.

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