Re: IPC vs TCP

  • From: "goran bogdanovic" <goran00@xxxxxxxxx>
  • To: finn.oracledba@xxxxxxxxx
  • Date: Thu, 24 Apr 2008 14:54:23 +0200

IIRC, the feature that local connections are forced automatically to use IPC
connection was existing for SqlNet up to 8.1.5...after that this 'feature'
has been removed I think.
anyhow, the use of IPC (unlike the Bequeath protocol) do require listener to
be up and running.

On Thu, Apr 24, 2008 at 2:26 AM, Finn Jorgensen <finn.oracledba@xxxxxxxxx>

> Strange. I was under the impression the TCP stack (on Unix at least) would
> switch you to IPC when it realized you were on the local loopback. Of
> course, I'm not a network guy and I haven't done extensive testing, so it's
> all hearsay.
> Finn
> On Wed, Apr 23, 2008 at 6:39 PM, Cary Millsap <cary.millsap@xxxxxxxxxxxx>
> wrote:
>> Jeff and I saw about a 55:1 response time improvement on a little PL/SQL
>> block that executed a few hundred thousand dbcalls in 2001 (this is the
>> first case study in the Optimizing Oracle Performance book). We ran once
>> connected to an alias with protocol=tcp, and then again using a different
>> alias with protocol=beq. Then we ran test 1 again, then test 2 again, to
>> eliminate the possibility that the performance improvement was just an
>> artifact of db block buffer caching.
>> I don't have the repro case for the test we did, but it was something like
>> a select of one row from a real table executed over and over again. It
>> repeatedly ran about a minute through TCP and about a second through BEQ.
>> Cary Millsap
>> On Wed, Apr 23, 2008 at 3:50 PM, Jared Still <jkstill@xxxxxxxxx> wrote:
>>> Env:
>>> Linux 2.6. on Intel
>>> Oracle
>>> In the past I have been led to believe (without much proof) that when
>>> connecting
>>> to a database on the local server, that IPC should always be used to
>>> avoid the
>>> performance hit of going through the TCP stack.
>>> Using a modified version of Tom Kyte's run_stats that allows for
>>> collecting
>>> stats from two different sessions, some minimal testing seems to indicate
>>> there is little difference whether connecting via IPC or TCP.
>>> Of course you are probably asking:
>>> "If you are on the server, why setup either?"
>>> The answer is because many applications always connect through TNS.
>>> In any case, I don't see much difference regardless of how the connection
>>> is made
>>> while on the server.
>>> Has anyone here done any testing on this?
>>> Or perhaps it is something that changed in a release?
>>> Thanks,
>>> --
>>> Jared Still
>>> Certifiable Oracle DBA and Part Time Perl Evangelist

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