Re: Mismatch between v$filestat and v$sysstat

>From the 10gR1 reference manual for v$filestat:

 PHYRDS NUMBER Number of physical reads done PHYWRTS NUMBER Number of times DBWR is required to write PHYBLKRD NUMBER Number of physical blocks read PHYBLKWRT NUMBER Number of blocks written to disk, which may be the same as PHYWRTS if all writes are single blocks
HTH Jared

On 10/31/05, Allen, Brandon <Brandon.Allen_at_oneneck.com> wrote:
>
> My apologies for not searching Metalink thoroughly prior to posting. I did
> a cursory search before posting, but just searched again and found the
> following explanation:
>
> "The 'physical reads' statistic (from v$sysstat) reflects the number of
> blocks read from the OS, not the number of I/O's. The Tablespace IO section
> is obtained from the v$filestat view which reflects the number of I/O's, not
> the number of blocks returned."
>
> I wasn't aware that 'physical reads' from v$sysstat reflected the # of
> blocks rather than # of reads. Seems like the stat name is a bit misleading
> then. It should be 'physical blocks read' if you ask me.
>
>
> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org
> [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Allen, Brandon
> Sent: Monday, October 31, 2005 10:48 AM
> To: oracle-l_at_freelists.org
> Subject: Mismatch between v$filestat and v$sysstat
>
>
> Why doesn't sum(phyrds) from v$filestat match 'physical reads' from
> v$sysstat?
>
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--
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist

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