ODI 11g – Oracle Multi Table Insert
- by David Allan
With the IKM Oracle Multi Table Insert you can generate Oracle specific DML for inserting into multiple target tables from a single query result – without reprocessing the query or staging its result.
When designing this to exploit the IKM you must split the problem into the reusable parts – the select part goes in one interface (I named SELECT_PART), then each target goes in a separate interface (INSERT_SPECIAL and INSERT_REGULAR).
So for my statement below…
/*INSERT_SPECIAL interface */ insert all
when 1=1 And (INCOME_LEVEL > 250000) then
into SCOTT.CUSTOMERS_NEW
(ID, NAME, GENDER, BIRTH_DATE, MARITAL_STATUS, INCOME_LEVEL, CREDIT_LIMIT, EMAIL, USER_CREATED, DATE_CREATED, USER_MODIFIED, DATE_MODIFIED)
values
(ID, NAME, GENDER, BIRTH_DATE, MARITAL_STATUS, INCOME_LEVEL, CREDIT_LIMIT, EMAIL, USER_CREATED, DATE_CREATED, USER_MODIFIED, DATE_MODIFIED)
/* INSERT_REGULAR interface */ when 1=1 then
into SCOTT.CUSTOMERS_SPECIAL
(ID, NAME, GENDER, BIRTH_DATE, MARITAL_STATUS, INCOME_LEVEL, CREDIT_LIMIT, EMAIL, USER_CREATED, DATE_CREATED, USER_MODIFIED, DATE_MODIFIED)
values
(ID, NAME, GENDER, BIRTH_DATE, MARITAL_STATUS, INCOME_LEVEL, CREDIT_LIMIT, EMAIL, USER_CREATED, DATE_CREATED, USER_MODIFIED, DATE_MODIFIED)
/*SELECT*PART interface */ select CUSTOMERS.EMAIL EMAIL,
CUSTOMERS.CREDIT_LIMIT CREDIT_LIMIT,
UPPER(CUSTOMERS.NAME) NAME,
CUSTOMERS.USER_MODIFIED USER_MODIFIED,
CUSTOMERS.DATE_MODIFIED DATE_MODIFIED,
CUSTOMERS.BIRTH_DATE BIRTH_DATE,
CUSTOMERS.MARITAL_STATUS MARITAL_STATUS,
CUSTOMERS.ID ID,
CUSTOMERS.USER_CREATED USER_CREATED,
CUSTOMERS.GENDER GENDER,
CUSTOMERS.DATE_CREATED DATE_CREATED,
CUSTOMERS.INCOME_LEVEL INCOME_LEVEL
from SCOTT.CUSTOMERS CUSTOMERS
where (1=1)
Firstly I create a SELECT_PART temporary interface for the query to be reused and in the IKM assignment I state that it is defining the query, it is not a target and it should not be executed.
Then in my INSERT_SPECIAL interface loading a target with a filter, I set define query to false, then set true for the target table and execute to false. This interface uses the SELECT_PART query definition interface as a source.
Finally in my final interface loading another target I set define query to false again, set target table to true and execute to true – this is the go run it indicator!
To coordinate the statement construction you will need to create a package with the select and insert statements. With 11g you can now execute the package in simulation mode and preview the generated code including the SQL statements.
Hopefully this helps shed some light on how you can leverage the Oracle MTI statement. A similar IKM exists for Teradata. The ODI IKM Teradata Multi Statement supports this multi statement request in 11g, here is an extract from the paper at www.teradata.com/white-papers/born-to-be-parallel-eb3053/
Teradata Database offers an SQL extension called a Multi-Statement Request that allows several distinct SQL statements to be bundled together and sent to the optimizer as if they were one. Teradata Database will attempt to execute these SQL statements in parallel. When this feature is used, any sub-expressions that the different SQL statements have in common will be executed once, and the results shared among them.
It works in the same way as the ODI MTI IKM, multiple interfaces orchestrated in a package, each interface contributes some SQL, the last interface in the chain executes the multi statement.
