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RAC and its behaviour [message #567299] Wed, 26 September 2012 06:12 Go to next message
piotrtal
Messages: 152
Registered: June 2011
Location: Poland/Czestochowa
Senior Member

Hi,

i did some test with my RAC environment (2 nodes, 10g).

i am using TAF, and users connect with PRECONNECT method and SELECT option.
so teorethically if i invoke something like this on the first node:

select * from test;


where test contains 3 milions rows, and simulate crash of this node. my session will be reconnected on the other one and select will be reinvoked.
and this behaves in my enviromnent as i suspected.

-------------------

but second test was with procedure. i know that DML reinvoking is not supported in RAC so i even didnt try to do this but i thought that maybe procedures execution could be reinvoked in RAC.

lets try this exemplary procedure:

create or replace procedure dotest is
v1 date;
begin
for i in 1..1000000 loop
select sysdate into v1 from dual;
end loop;
end dotest;



when i do:

exec dotest;


and crash node on which this procedure was executed, the session hangs and nothing happens. i thought that maybe some ORA will be displayed but during such simulation nothing happened.

is it normal behavior that RAC is not reinvoking procedures after node crash?

thanks
Re: RAC and its behaviour [message #570520 is a reply to message #567299] Sun, 11 November 2012 16:52 Go to previous message
mkounalis
Messages: 147
Registered: October 2009
Location: Dallas, TX
Senior Member
Procedure execution does not failover. As stated in the Oracle documentation for SELECT failover, only simple select statements fail over.
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