How to determine all tables used in a series of maps?

Hi, I'd like to find out all of the tables in the source warehouse builder schemas that are actually being used during ETL. I imported the entire databases at the start of the project, and want to find out which of the 2000 tables are actually being used.
Is there a simple query I can run against the repository owner views to determine all tables actively being queried?
Thanks in advance for the help!
Scott

Scott,
maybe the simplest way to report tables usage in mappings is extracting this info from DB dictionary view DBA_DEPENDENCIES.
Of course this method has several limitations:
- all mappings must be of type PLSQL
- all mappings must be deployed to target database
- maybe it doesn't work for non-Oracle source databases
For example, this query (when executed in target DWH schema) shows remote databases (and number of used tables in each source DB) used by PLSQL packages (mappings, of course you need to exclude "non-mapping" packages with additional filter)
select REFERENCED_LINK_NAME,count(distinct REFERENCED_OWNER||'.'||REFERENCED_NAME) from user_dependencies
where REFERENCED_LINK_NAME is not null and type='PACKAGE BODY'
group by REFERENCED_LINK_NAME;
When source and target schemas are in the same DB this query will be different
(in this this case source system will be identified by REFERENCED_OWNER column and REFERENCED_LINK_NAME will be NULL).
As I know OWB repository tables/views for lineage/impact analysis are not published/documented by Oracle.
Regards,
Oleg

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