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I access several tables remotely via DB Link. They are very normalized and the data in each is effective-dated. Of the millions of records in each table, only a subset of ~50k are current records.
The tables are internally managed by a commercial product that will throw a huge fit if I add indexes or make alterations to its tables in any way.
What are my options for speeding up access to these tables?
You could try to create a materialized view of some subset of the tables over the DB link and then query from those.