Oracle Scratchpad

June 30, 2011

Virtual bug

Filed under: Bugs,Function based indexes,Indexing,Oracle,Parallel Execution,Statistics,Troubleshooting — Jonathan Lewis @ 5:37 pm BST Jun 30,2011

I’ve said in the past that one of the best new features, in my view, in 11g was the appearance of proper virtual columns; and I’ve also been very keen on the new “approximate NDV” that makes it viable to collect stats with the “auto_sample_size”.

Who’d have guessed that if you put them both together, then ran a parallel stats collection it would break :(

The bug number Karen quotes (10013177.8) doesn’t (appear to) mention extended stats – but since virtual columns, function-based indexes, and extended stats share a number of implementation details I’d guess that they might be affected as well.

3 Comments »

  1. great insight into oracle 11g

    Comment by lkafle — July 1, 2011 @ 4:49 am BST Jul 1,2011 | Reply

  2. Oracle supplied us a patch for this bug that we applied and tested successfully today. See http://karenmorton.blogspot.com/2011/07/bug-update.html for the link to the patch.

    Comment by Karen Morton — July 13, 2011 @ 11:03 pm BST Jul 13,2011 | Reply


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