Re: FW: DFS in RAC
- From: K Gopalakrishnan <kaygopal@xxxxxxxxx>
- To: racdba@xxxxxxxxxxxxx
- Date: Mon, 25 Jul 2005 20:26:36 +0530
Amir:
DFS is the distributed File System lock.. Remember the old OPS
parameter GC_FILES_TO_LOCKS. There is a discussion about
_fairness_threshold in the OWI book and a lot more detailed discussion
will be available in RAC book, Basically we disown the ownership of
the blocks if too many requests come for the specific block. 10gR2
has better remastering algorithm which transfers the ownership of the
object instead of the block when it is touched too many times in
within certain time (_gc_affinity_time and _gc_affinity_limit).
Regards,
Gopal
> ______________________________________________
> From: Hameed, Amir
> Sent: Monday, July 25, 2005 9:44 AM
> To: oracle-l@xxxxxxxxxxxxx
> Subject: DFS in RAC
>
> There are certain events in RAC that are related to DFS. There are also
> certain init.ora parameters that have the term DFS associated with, like:
>
> _fairness_threshold number --> of times to CR serve before downgrading lock
> (DFS)
>
> Does anyone know what the term "DFS" stands for?
>
> Thanks
> Amir
--
Best Regards,
K Gopalakrishnan
Co-Author: Oracle Wait Interface, Oracle Press 2004
http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/
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