Re: What's the difference between pins and gets

To find whether a statement is already cached, the Oracle server: 1 Reduces the statement to the numeric value of the ASCII text 2 Uses a hash function of this number

HTH,

• Original Message ----- From: Shevtsov, Eduard <EShevtsov_at_flagship.ru> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Wednesday, November 08, 2000 11:40 AM Subject: RE: What's the difference between pins and gets

> Hi Steve,
>
> how does Oracle determine that a needed object was previously located in
the
> library cache before it would be pinned ? Does Oracle use some information
> in the library cache or it firstly tries to 'get' the object ?
>
> Thanks in advance
>
> Ed
>
>
> >
> >
> > Hi Alex,
> >
> > A get is an attempt to locate an object in the library
> > cache. If it is not
> > found, it is loaded. Database object definitions are loaded
> > from the data
> > dictionary via the dictionary cache. Cursors are loaded by
> > parsing the statement
> > text.
> >
> > A pin is an attempt to use a previously located object in
> > the library cache. If
> > it has been aged out, then it must be reloaded.
> >
> > @ Regards,
> > @ Steve Adams
> > @ http://www.ixora.com.au/
> > @ http://www.christianity.net.au/
> >
> >
> > -----Original Message-----
> > Sent: Wednesday, 8 November 2000 16:20
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > Hi Listers,
> >
> > Could anybody please explain about what is the difference
> > between gets
> > and pins and correspondingly between gethits and pinhits in the
> > v$librarycache view?
> >
> > Thank you,
> > AlexP
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: AlexP
> > INET: apot_at_canadawired.com
> >
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> > Author: Steve Adams
> > INET: steve.adams_at_ixora.com.au
> >
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Shevtsov, Eduard
> INET: EShevtsov_at_flagship.ru
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
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