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Posted by Erland Sommarskog on 02/06/07 23:05
(vikram.mankar@gmail.com) writes:
> The application logs "raw" data. The SQL Job (stored procedure) is
> adding attributes to that data and moving it to "report" tables. The
> cursor was used to select the right attributes based on the data
> logged.
>
> The application is logging data from a hardware device (PLC) thats
> generating data faster than the application can accept (at times) ..
> hence the issue of duplicates to avoid any data loss during the timing
> issue. There is unfortunately no way to control the duplicate problem
> at the application level. But since its generating data so fast - we
> need to just dump the raw data in a table and then copy it for
> reporting purposes.
I can understand that you log everthing in the raw tables. That
certainly seems like the best strategy. And my suggestion was not
that you have the WHERE NOT EXISTS in this place, but rather the in
the Agent job.
Whether the WHERE NOT EXISTS would be too costly in the Agent job,
I don't think so. After all, if you can afford having a cursor, then
you don't appear to be in a hurry...
--
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se
Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx
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