RE: Locking Problem

Hi Dennis,

I am using D2k as Front End.

I need to implement locking mechanism on Invoice Processing application itself.
Currently , If 2 users have open the same invoice one user starts invoice processing, Since processing
Takes a significant amount of time ..other user is able to insert new records in Invoice_Lines which creates
Inconsistency. I mean printed invoice shows Total Invoice amount different from Total of Invoice Lines in the database.  It happened 4-5 times. I updated the invoice records manually. Need permanent solution.

Thanks
Suman         

	-----Original Message-----
	From:	DENNIS WILLIAMS [SMTP:DWILLIAMS_at_LIFETOUCH.COM]
	Sent:	Friday, September 13, 2002 9:38 PM
	To:	Multiple recipients of list ORACLE-L
	Subject:	RE: Locking Problem

	Suman - What front-end tool are you using? Often the locking
strategy is
	part of the front-end tool.
	   It sounds like your locking strategy is too pessimistic. You
shouldn't be
	locking the record "while users are working on it". Eventually you
will have
	users that go to lunch while the record is locked. Your life as a
DBA will
	be miserable. For most applications, when the user selects the
record, do a
	simple query, don't lock the record. When the user returns the
record, hold
	a momentary lock while the record is updated. This has been
satisfactory for
	almost all applications. Otherwise your application won't scale
because the
	locks get out of control. If you are really paranoid, when the
record is
	updated, you can requery the record and verify it against your
original copy
	to ensure someone didn't change the record while you were working on
it. If
	someone else changed it, give the user an error.


	 
	Dennis Williams
	DBA
	Lifetouch, Inc.
	dwilliams_at_lifetouch.com <mailto:dwilliams_at_lifetouch.com> 


	-----Original Message-----
	Sent: Friday, September 13, 2002 8:04 AM
	To: Multiple recipients of list ORACLE-L



		Hi Everybody,


		I am facing problem while invoice Processing.

		We have Invoice_Header table and Invoice_Lines Table.

		One Record in Invoice_Header table can have multiple related
records
	in Invoice_Lines.

		We have not implemented locking mechanism at header level.
So
	whenever two user working on same invoice it creates problem.

		Say One Invoice has 10 lines in Invoice_Lines Table and
first user
	pressed the <Process Invoice> button. It does so many validation and
insert
	records in subledger. Mean while another user can add new lines in
same
	Invoice result is discrepancy in printed copy and system records.


		Can anybody tell me how to resolve this issue.


		Thanks
		Suman


















		 

		


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	Author: Suman S K
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	Author: DENNIS WILLIAMS
	  INET: DWILLIAMS_at_LIFETOUCH.COM

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  INET: SumanK_at_mascotsystems.com

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