How can we improve query performance with out indexes?

Hello Experts,
I have a problem with table(calc) which contain 3 crore records and table doesn't have index, on that table one of the view(View_A) created.
When i use the view in below query SELECT count(*)
FROM
Table A INNER JOIN Table B ON (A.a=B.b)
LEFT OUTER JOIN View_A ON ( Table A.a=View_A.a)
LEFT OUTER JOIN View_B ON (Table A.a=View_B.a)
In above query View_A is causing the problem, view_A is created on Calc table. One more thing when i execute select statement on the view it was running fine.
With out View_A query fetching data fine. Update stats of the table also fine. When i run cost plan for scanning only cost % is 90.
Can any help me please?.
Thank you all.
Regards,
Jason.

Jason,
Not sure what you are trying to do. But outer joins are bad for performance. So try to avoid them.
You also say that you have a view on a calc table. What are you calculating? Are you using user defined functions maybe?
Regards,
Nico

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