Can a long running batch job causing deadlock bring server performance down

Hi
I have a customer having a long running batch job (approx 6 hrs), recently we experienced performance issue where the job now taking >12 hrs. The database server is crawling. Looking at the alert.log showing some deadlock,
The batch job are in fact many parallel child batch job that running at the same time, that would have explain the deadlock.
Thus, i just wondering any possibility that due to deadlock, can cause the whole server to be crawling, even connect to the database using toad is also getting slow or doing ls -lrt..
Thanks
Rgds
Ung

Kok Aik wrote:
According to documentation, complex deadlock can make the job appeared hang & affect throughput, but it didn't mentioned how it will make the whole server to slow down. My initial thought would be the rolling back and reconstruct of CR copy that would have use up the cpu.
I think your ideas on rolling back, CR construction etc. are good guesses. If you have deadlocks, then you have multiple processes working in the same place in the database at the same time, so there may be other "near-deadlocks" that cause all sorts of interference problems.
Obviously you could have processes queueing for the same resource for some time without getting into a deadlock.
You can have a long running update hit a row which was changed by another user after the update started - which woudl cause the long-running update to rollback and start again (Tom Kyte refers to this as 'write consistency' if you want to search his website for a discussion on the topic).
Once concurrent processes start sliding out of their correct sequences because of a few delays, it's possible for reports that used to run when nothing else was going on suddenly finding themselves running while updates are going on - and doing lots more reads (physical I/O) of the undo tablespace to take blocks a long way back into the past.
And so on...
Anyway, according to the customer, the problem seems to be related to the lgpr_size as the problem disappeared after they revert it back to its orignial default value,0. I couldn't figure out what the lgpr_size is - can you explain.
Thanks
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking" Carl Sagan

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