Hi Kyle, I wrote a paper with few examples of these kinds of issues: http://prodlife.files.wordpress.com/2009/03/microsoft-word-seven-sins-of-concurrency.pdf The scripts that are mentioned in the paper can be downloaded here: http://prodlife.wordpress.com/presentations/ Thanks, Chen Shapira On Tue, May 12, 2009 at 8:11 AM, kyle Hailey <kylelf@xxxxxxxxx> wrote: > with one user and it runs fine and then gets put into production and > only to hit a huge performance snafu. I'm putting together a demo on this > kind of situation and was > thinking of some examples. One example that came to mind is a Nesedt > Loops join that hammers the root node of an index. Might work fine for > one user, but when multiple users start running it, the query runs > into cache buffers chains latch issues with the high concurrency > access to the index's root block which might be resolved by doing a > hash join or moving the lookup table to a hash cluster for example. > Wondering if anyone else had good examples of developer code that > worked fine with one user and broke in the multi user production > environment. -- //www.freelists.org/webpage/oracle-l