Optimization of greater than operator

Question

credit table and validtransaction table have million record data from year 2008 onwards.

We are doing a migration. So I need to find out the credittypeids which are no

Answer 1

The following index on the CREDIT table should help:

CREATE INDEX idx ON CREDIT (PERIODSEQ, CREDITTYPEID);

This should allow the EXISTS clause lookup to evaluate more quickly. You could also try the following variant index, which reverses the order of the columns:

CREATE INDEX idx ON CREDIT (CREDITTYPEID, PERIODSEQ);