Tim, TAF still requires the application to be
programmed with Oracle8 OCI and greater. TAF is a
combination of OCI and net services to allow the
failover to occur. This requirement is still
documented in the Oracle9i R2 manuals.
http://otn.oracle.com/docs/products/oracle9i/doc_library/release2/rac.920/a96597/pshavdtl.htm#20180
Scott
- Tim Gorman <Tim_at_SageLogix.com> wrote:
> Hemant,
>
> TAF was specific to OCI only in v8.0 of the
> database. In v8.1 and upwards, it is specified
for
> any application or API in the TNSNAMES entry...
>
> This example comes straight out of the
"Oracle Net8
> Administration" manual, page 8-14. I'd
suggest
> reading up on the meaning of the FAILOVER_MODE
> settings, specifically TYPE= and METHOD=. Also,
if
> you have your OPS/RAC instances in a pure
> "active/passive" arrangement, then the
TNS entry
> below should work (i.e. LOAD_BALANCE=OFF). If
you
> have both instances equally available for user
> connections (i.e. "active/active"
failover
> arrangement), then you might consider changing
> LOAD_BALANCE=ON to distribute the connections
> randomly. However, you'll want to think
carefully
> about using that mechanism... :-)
>
> sales.us.acme.com=
> (description=
> (load_balance=off)
> (failover=on)
> (address_list=
> (address=
> (protocol=tcp)
> (host=sales1-server)
> (port=1521)
> )
> (address=
> (protocol=tcp)
> (host=sales2-server)
> (port=1521)
> )
> )
> (connect_data=
> (service_name = sales.us.acme.com)
> (failover_mode =
> (type=select)(method=basic))
> )
> )
> Hope this helps...
>
> -Tim
>
> ----- Original Message -----
> To: "Multiple recipients of list
ORACLE-L"
> <ORACLE-L_at_fatcity.com>
> Sent: Wednesday, October 02, 2002 10:13 AM
>
>
> >
> >
> > Can anyone send me sample Pro*C code
depicting how
> > they've handled TAF in 8iOPS or 9iRAC ?
> >
> > We've got some application servers running
Pro*C
> programs
> > which don't seem to able to handle failover.
> SQLPlus sessions
> > are failing over to the remaining instance
but the
> Pro*C programs
> > seem to be "hanging", without
returning any error,
> when
> > a transaction is "in-flight" We do
know that
> Insert/Update/Deletes
> > do not really failover but are wondering how
the
> Pro*C programs
> > could be written to handle the oracle error
on
> session failover
> > and resubmit the transaction.
> >
> >
> > Hemant K Chitale
> > My web site page is :
http://hkchital.tripod.com
> >
> >
> > --
> > Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> > --
> > Author: Hemant K Chitale
> > INET: hkchital_at_singnet.com.sg
> >
> > Fat City Network Services -- 858-538-5051
> http://www.fatcity.com
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and
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Received on Wed Oct 02 2002 - 22:33:19 CDT
