Data Grid Fetch - control limit at schema level

Hi,

I have observed that for few schemas, the data fetch limit is 500 rows and for few schemas its 300.
I am in Toad version 12.1.0.22. I could not find parameters “Limit Grid Fetch” or “OCI Buffer Size”.
Could you please help to understand where these parameters are defined and how they are differing at schema level?

Thanks,
Ayyappan

One possibility is the memory setting in Toad Options under Data Grid / Data

looks like this was posted twice. I replied here to the other: http://www.toadworld.com/products/toad-for-oracle/f/10/t/32454