Connect by Prior - ORA-00600: internal error code, arguments: [kkqcbydrv:1

Question

Hi,
We are writing some complex query using Connect by Prior in it.
When we execute this query on same version of database as that of our client, then the query is executing.
But when we execute this query at client's side then it raises error -
ORA-00600: internal error code, arguments: [kkqcbydrv:1] , [] , [] , [] , [] , [] , [] , []
After searching on metalink,
We could find two workarounds -
1. Use a /*+no_unnest*/ hint, but this may have perfomance implications.
2. alter session set "_optimizer_connect_by_cost_based"=false;
of which we cant use second workaround as this query is called from a application and not directly from oracle prompt.
We are working with the first workaround, but what is wondering us is that,
If same query can work well on our side then why is this query not performing in same way at client's side?
We are using same version of database, same amount of data is present in development and production databases.
Then what is causing this error only in priduction?
Any help in this regard is appreciated.
Thanks,
Av.

Answer 1

You can use the second tip in a database login trigger. But if the metalink ORA-600 diagnostic tool can only give you those workarounds I suggest raising a SR to try and get the bug fixed.
It may be differing patch levels that cause the difference between the two sites, some subtle difference in temp tablespace, a corrupt block - impossible for us to say but maybe not for Oracle.