just to clarify the earlier point (which failed to realize that slave
processes were being discussed)
Windows NT supplies its own I/O slaves and uses them to see if I/O is
complete.
from the 8.1.6 docs:
Initialization Parameters: Multiple Database Writers
See: Appendix B, "Oracle8i Database Specifications for Windows NT"
You can specify more than one database writer process with the
initialization parameter DB_WRITERS.
Multiple database writers can help, for example, when a UNIX port does
not support asynchronous I/O.
DB_WRITERS, which writes dirty buffers to disk, is not supported.
Windows NT supplies its own I/O slaves and uses them to see if I/O is
complete.
Multiple DB_WRITERS might cause synchronization problems.
Initialization Parameters Without Windows NT-Specific Values:
DB_WRITER_PROCESSES Not applicable or necessary on
Windows NT.
Paul
Paul Drake wrote:
>
> Hi.
>
> multiple DBWR processes are not supported on NT and can lead to
> corruption.
> (check the platform specific release notes - I read it in the 8.1.7
> notes).
> I have the errors in the alert log to prove it - on a developement
> server.
> 2 CPUs, 2 I/O channels, 6 drives and 1 DBWR process. Not exactly
> balanced.
>
> Can anyone else see an O'Reilly book in the works - Oracle on NT
> annoyances?
>
> Paul
>
> I think that you should ask Joe Testa as to the upgrade path ...
>
> Raghu Kota wrote:
> >
> > Hi Friends
> >
> > I have toad tool for my NT database
> >
> > DBWR Average Scan Depth 1024 **Number of DB_Files too high??
> >
> > I got doubt due to from v$waitstat I got data block waits some time 8000 and
> > some times higher number. How can I increase the DBWR slaves on NT??
> > although I set in development box, How can I see as background process
> > really working for me??
> >
> > I have my datafile and indexes same on E disk drive, My hit ratios are okay,
> > My import is killing me.
> >
> > Any help appreciated.
> >
> > Thanks
> > Raghu.
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