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Walden/Ron,  

 

I agree, a single update statement works well and closes the window of
exposure that a reread without record lock exposes.  

 

a.      Often in transactional systems, some fields are ok to allow the
latest value to win (such as salesYTD) while others should not allow
concurrent updates therefore the strategy of including the fields that don’t
allow concurrent in the where clause is effective.  

 

Update x.y  set name = ‘Frank’ where keyField = 9 and lockfield1 = “old
value1’ and lockfield2 = ‘old value2’

 

b.  Using a counter or timestamp loses this level of control.  An
unimportant field change could through out a pending change when really it
shouldn’t have to.  In addition, most databases don’t have this counter or
timestamp and folks are resistant to adding a new field to all files for
this purpose.  

Paul Holm
Senior Web Architect
PlanetJ Corp. 
Phone: 760-432-0600, Cell: 760-415-8830
WOW, Web Applications In Under 5 Minutes
HYPERLINK "http://www.gotWebData.net"; \nhttp://www.gotWebData.net 

 



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