May be below link help you:- http://www.oracle.com/technology/pub/articles/lewis_cbo.html On Thu, May 15, 2008 at 12:32 AM, David Aldridge <david@xxxxxxxxxxxxxxxxxx> wrote: > Does anyone know what units these are supposed to be in, or have any > caveats about setting them manually? > -- Amit Verma Oracle DBA & System Adminstrator E-Mail:- in.amitverma@xxxxxxxxx, v.amit@xxxxxxxxxxx WebSite:- http://www.linkedin.com/in/vamit IM:- verma.labs@xxxxxxxxx Mobile:- (+91) 98910.98927