I will briefly describe my problem in here...
I am working with Access database file (.accdb), due to some compatibility issues I had to run 32 bit version of R to access the database and import data. I have imported the data but when I try to do some operations on the data file (merging) I run into an error
Error: cannot allocate vector of size 152.1 Mb
in 32 bit:
and then in 64 bit: