What happens if I don't know several target load order in advance?

OWB always lets user to set a load order target for mapping that has multiple targets, what should I do if I don't know in advance the target load order?

Load order sometimes target is determined by the source table (file) and change several times during execution according to the record in the source.

A set of example of the record.csv of the source file data is defined as: (insert I:, U:update, delete D)
Action, DateTime, key, name Desc
I, 71520031200, ProdABC, ABC, ABC product
I, 71520031201, CRC, ProdCDE, produces CDE
I, 71520031202, XYZ, ProdXYZ, product XYZ
U, 71620031200, ProdABC, ABC, ABC produced with option
D, 71620032300, ProdABC, ABC, ABC produced with option
I, 71720031200, ABC, ProdABC, former ProdABC reintroduced
U, 71720031201, XYZ, ProdXYZ, rename XYZ

You want to load the data into a target table as follows:
DESCRIPTION OF THE NAME OF THE KEY SRC_TIMESTA
CRC product ProdCDE CDE 71520031201
71720031201 XYZ ProdXYZ rename XYZ
ABC 71720031200, ProdABC former ProdABC reintroduced

Solution: we define three targets, one for insert, delete and update.
The order of loading for these targets are exactly the order in the file line by line, of the source, so order here are not determined, how instruct owb to load targets in the order of the records in the source?

Agree with Dallan, you CAN get it works.

Your flow of source table separator which has three external groups according to your flag field and you have three targets defined by type of operation. Don't worry about the definition of an explicit load order.

For OWB to generate Code that works, on the configuration tab set:

Block size = 1
By default the operating Mode = line on
Optimize the Code checked =
Use the load order target = unchecked
Bulk processing = Code checked
Generation line Mode = on

And the generated code SHOULD do what you want, scroll down your input in the order at a table and apply the proper functioning of this line.

Now, if OWB keeps their code generating engine constant from one version to the other is debatable. Frankly, I would like to make a remark that future updates OWB would need to re - test this map.

I should also mention that I am always wary of any implied order in a select statement, which assumes the code. It is expected that a "Select * from external_table" will bring back lines in the same order as the file. And he cursed well should!

But no one has ever seen Oracle guarantees the order of query results when it is not explicitly specified in a clause "order by"?

Me too.

And given my distaste of uncertanty and assumptionms, I would say that IF the order of processing is a neccessity then I would add a pseudo-column RECNUM to the external table definition and order it before executing by the dispatcher to ensure this order.

Mike

Tags: Business Intelligence

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