Re: IPC vs TCP
- From: Alex Gorbachev <ag@xxxxxxxxxxxx>
- To: Oracle-L Freelists <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 23 Apr 2008 22:37:22 -0400
"a little PL/SQL block that executed a few hundred thousand dbcalls"I have a suspicion that Cary meant PL/SQL block running from Forms or something like that (I can't lookup in his book now - it's in the office). I recalls Forms place calls differently but I don't have significant experience with them to be honest.
On 23-Apr-08, at 8:26 PM, Finn Jorgensen wrote:
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.FinnOn 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