Hello All,
I am getting the ORA-1555 ( SNAPSHOT TOO OLD ) errors and then the batch jobs are ending unsuccessfully, When I restart the job it won't be having any problem in successful completion.

My doubts are
1. Why this error comes
2. How should we arrest this error
3. What all things i have to/can check on the database , when this error occurs, before restarting the batch job.

Your reply will be very much appreciated,

Thanks in advance,
Madhu