Asynchronous commit - wait or no wait 10GR2
- From: "John Hallas" <john.hallas@xxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 3 Oct 2007 11:51:23 +0100
In 10GR2 there is an option to commit immediate nowait which allows the
commit to return before the redo is persistent in the redo log. This is
not the default. The default commit remains as commit write immediate
wait.
I am testing Sybase and Oracle inserts and I have noticed an oddity with
in Oracle. Solaris 10G T2000 server 10.2.0.3
A simple stored procedure
create table loaded1 ( id number, name varchar2(8), last_modified
date);
create or replace procedure sp4 ( loops in number)
as
cnt number :=0;
begin
while (cnt < loops)
LOOP
insert into loaded1 values (cnt,'abcdefgh',sysdate);
commit write immediate nowait; XXXXXXXXX
cnt := cnt+1;
END LOOP;
commit;
end;
/
Where line xxxxxxxx can be commit write immediate wait;, commit write
immediate nowait; , commit; The first and last should be identical and
be the Oracle default. My parameter commit_write is not set. I am
truncating the table after each run.
Timings
CWIW 5000 records 57 secs
CWINW 5000 records 3 seconds
Commit 5000 records 3 seconds
These figures are repeatable. I think that the first and longest option
should be the Oracle default according to all the documentation but I am
thinking that in fact the 2nd option (nowait) is the real default.
Am I missing something here
John
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