@YERNIKUMARD

In terms of funcationality both Obj operations and RDB can achive the requirement almost.But performance wise, it's not recommended to use RDB methosd unless we are using external Database to connect and/or we are writing complex data base queries which are not possible with Obj methods.

Obj- operations generate their own SQL while RDB- operations rely on the query written in Rule-Connect-SQL instances.

Obj methods are meant for transactional ease as they have the option of deferred save, rollback etc whereas RDB methods are performed immediately with auto-commit

HI @YERNIKUMARD, 

Please find difference between Obj and RDB methods below :

Note : It is recommended to use RDB on external table only but you can use them on internal table if your query contains complex DB CLAUSE.

Hope it Helps.

Thanks, Ankit 

@YERNIKUMARD

RDB methods work only on flat tables and cannot fetch data from inside BLOB column whereas obj methods cab decrypt and fetch from inside BLOB

Hi @YERNIKUMARD,

Here you can go through, This Pega Discussion written by @KenshoTsuchihashi nice article.

When we should use RDB methods over Obj methods | Support Center

I hope this will help you

Thanks,

Ashok