Scheduled export hangs very often

Question

Hi friends,
I've scheduled export running on DB server-Windows. I've created a batch file with export commands for about 5 databases and scheduled the job to run this batch file every night around 9 pm.
But, the export hangs quite often atleast 1-2 night a week with this message and when I come in the morning I had to hit enter for it to proceed:
batch file: (I've replaced the username,pwd etc in the below cmd, cannot provide on the forums...)
exp system/pwd@db1 file=exp_db1_full.dmp log=exp_db1_full.log full=y buffer=400000
exp username/pwd@db2 file=db2_user.dmp log=db2_user.log buffer=400000
exp system/pwd@db3 file=exp_db3_full.dmp log=exp_db3_full.log full=y buffer=400000
exp username/pwd@db4 file=db4_user.dmp log=db4_user.log buffer=300000
exp username/pwd@db5 file=db5_user.dmp log=db5_user.log buffer=300000
D:\>exp username/pwd@db4  file=db4_user.dmp log=db4_user.log buffer=300000
Export: Release 10.2.0.3.0 - Production on Wed Jan 13 21:17:36 2010
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
Connected to: Oracle Database 10g Release 10.2.0.3.0 - 64bit Production
EXP-00028: failed to open dbname_user.dmp for write
Export file: EXPDAT.DMP >It hangs mostly for db3,db4 or db5 exports.. Not consistent either. Just stops with this command. Please give me your suggestions...
Thanks a lot

Answer 1

It could be a couple of issues:
1. The file you gave it may be maxing out size wise and since there is no other file to use, exp builds the default file
expdat.dmp and prompts the user to make sure it is ok to use that file. To get around this, you could add a second
filename to the exp commands. If this happens for more than one job, you are overwriting the expdat.dmp file from the
previous job.
2. If for some reason it can't open that file, it would prompt for the expdat.dmp file.
So, by hitting <cr> when prompted, your exp job will write to the expdat.dmp file. It would be interesting to look at the size of the expdat.dmp file and the size of the file you thought the export was going to write to.
Dean