django cron job - stops after reading some portion of huge file - why is this?

I am reading file from url and parsing it and saving some information out of this file into db - using cron job. 

i am testing now in my local dev. 

the problem is: job is reading file and saving into db without any problem but after some time, since file is very huge approx. >8GB, job doesnot do anything and freezes, without giving any error, 

i am using django 1.4, python 2.7 and postgresql. is there any limit for writing into db? why is it freezing? 

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