It gets more complicated under Oracle 9 because
initrans has a minimum value of 2 on tables; but
under oracle 8, the following should work:
create table t1
initrans 1
maxtrans 1
insert a few dozen rows into t1
so that there are rows in at least
two blocks, and commit.
session 1
update a row in block 1
session 2
update a row in block 2
session 1
update a row in block 2 -- will wait on a TX/4
session 2
update a row in block 1 -- will wait on a TX/4
After ca, three seconds session 1 will report ORA-00060.
In Oracle 9, you may get lucky with just two blocks
of data and three concurrent sessions, but for consistency
you need to have three blocks of data and rotate through
the sessions updating one row in each block from each session
in turn.
Jonathan Lewis
http://www.jlcomp.demon.co.uk
Author of:
Practical Oracle 8i: Building Efficient Databases
Next Seminar - Australia - July/August
http://www.jlcomp.demon.co.uk/seminar.html
Host to The Co-Operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html
|Walter K wrote:
|
|> Can someone post an example of how to trigger a
|> deadlock (ORA-0060) due to ITL shortage? This is for
|> informational/fact-finding purposes.
|>
|> I've created a test table with MAXTRANS=1 and can
|> cause the enqueue waits between two sessions
|> contending for the same block but I can't seem to
|> cause a deadlock to occur.
|>
|> Thanks.
|> -w
|>
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