Satesh
When you have questions like this, you need to post the full DDL (create table plus all create indices) for the affected tables.
- calc_data has some REFERENCES to leb and lsp
- access to lsp is fine, it is using the CI
- On leb, there is no *useful* index that the Optimiser can use. Ie. the columns in leb that are REFERENCED by the columns in calc_data, are not indexed.
The correction is to add an index for those columns ... but I would not advise that until I have seen the full DDL for the three tables.
Cheers
Derek