Filter not being generated into where clause

Hi,
I have a simple mapping that has a source table, a filter, and a target table that is set to DELETE. The source table has many rows, but the filter would narrow down these rows by a lot. When I generate the code, the cursor that gets created SELECTs the whole table then there is an IF statement that is applied to each row with the filter condition. A lot less processing would be required if the filter was implemented as a WHERE clause in the cursor, but I can't get it to generate this way. I realize that deletes automatically generate row-based code but it would still be row-based if the WHERE clause was in the cursor.
Is there any way to get it to generate the filter as a WHERE clause in the cursor?

Hi,
In general, Warehouse Builder gives you a number of different operating modes:
- set-based: which does everything in (one) SQL statement. This method is most performant, but has some limitations. Warehouse Builder today does not support set-based deletes (arguably, deletes are not the most common operation in a data warehouse).
- row-based: which is optimal for debugging. In row-based mode, you get as many records as possible and all operations/transformations take place in PL/SQL. This option gives you most debugging capabilities.
- row-based bulk: which is the previous method fetching rows in bulk (e.g. 100 by 100). Bulk processing speeds up the overall processing.
- row-based target only: in this mode we push as many of the operations/transformations as possible into the query (cursor). I.e. your filter (in your case) would be implemented as a restriction on the filter.
- row-based target only in bulk: see previous.
Warehouse Builder's default operation is set-based fail over to row-based. I.e. because we do not support set-based delete statements, I suspect you fall back to the row-based method of execution, which is not ideal in your case. I suggest you use the row-based target only option in order to get optimal performance for your scenario.
Note that for the deletes that are common in DW scenarios the row-based bulk deletes that we generate are often faster than set-based deletes. Also note that if you perform a complete delete (or even truncate) followed by an insert that Warehouse Builder does issue one statement for emptying the table.
Thanks,
Mark.

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