Performance in the treatment of the based on a game, several tables from target

Welcome.

I have question about a treatment based on a game, when mapping have several tables in the target. I noticed that OWB generate SQL code that usually build a query for each table in the target insertion. Suggest that each table has results from different stages of the treatment, so multi table insert cannot be used. Looking for generated code PL/SQL, I feel that each insert query managed independently and so each make analyses of source table and joins on its own.
To make my question more concrete, I will introduce two simple examples of stream ETL:
1) start-> (table scan)--> (joins)--> (inserting into the table t1)
2) start-> (table scan)--> (joins)-> two targets: (insert into table t1)
-> two targets: (deduplicator)--> (insertion in table t2)
Admit, that scans and joins are very expensive comparing to insert rows. Thus, it is usually, if oracle performs scans of tables 2 and joined in example 2) and example 2) take twice longer than example 1)?
Or fact Oracle is so smart that it can cache the result of entering the first query and use it again in the second query?

Best regards
Pawel

Hi Pawel,

Thus, it is usually, if oracle performs scans of tables 2 and joined in example 2) and example 2) take twice longer than example 1)?

Yes, you are right

Or fact Oracle is so smart that it can cache the result of entering the first query and use it again in the second query?

Nor the database Oracle or OWB don't is not to intermediate capabilities query result caching.
While the Oracle database feature "result cache queries", but it must match exactly to SQL source and it store only the final query result...

Kind regards
Oleg

Tags: Business Intelligence

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