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Cursor and a file

 
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saagu

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Joined: 15 May 2008
Posts: 41
Location: Chennai

PostPosted: Tue Nov 11, 2008 4:09 pm    Post subject: Cursor and a file
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Hi Can some one clarify my doubt.

Metod 1:

Reading a key fields from a file and deleting rows for all the 5 tables using cursors for each table(key fields are common) and again reading another row key field and deleting from all the 5 tables.

Method 2:
Reading a file one by one row and deleteing all the rows related for one table first using cursor(complete for one table) and then again reading file and deleteing for another table one by one.


Which one would be better in performance.
Please suggest me as earlier.

Thanks in Advance,
Saagu
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dbzTHEdinosauer

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Joined: 20 Oct 2006
Posts: 6966
Location: porcelain throne

PostPosted: Tue Nov 11, 2008 4:31 pm    Post subject:
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if i have interpreted correctly:

method 1:
open file
read file, delete rows on db2 tables via 5 cursors.
close file

method 2:
open file
read file, delete rows on db2 table via cursor
close file, open file
read file, delete rows on db2 table via cursor
close file, open file
read file, delete rows on db2 table via cursor
close file, open file
read file, delete rows on db2 table via cursor
close file, open file
read file, delete rows on db2 table via cursor
close file

of the two that you have suggested, neither gives me a warm fuzzy feeling

Why the cursors?

METHOD 3:
open file
read file, delete via DELETE WHERE, on each of the 5 tables, without cursors.
close file
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