Comments on: Bitmap Index

By: Jonathan Lewis

Jonathan Lewis — Sat, 27 Aug 2011 05:36:48 +0000

I wonder how much the dbms_profiler would pick up in terms of internal call counts. Mind you, almost any pl/sql function at the wrong place in a where clause - particularly when called for every row in a large table - tends to be a CPU threat.

By: Log Buffer #235, A Carnival of the Vanities for DBAs | The Pythian Blog

Log Buffer #235, A Carnival of the Vanities for DBAs | The Pythian Blog — Fri, 26 Aug 2011 11:01:37 +0000

[...] Jonathan Lewis shares a very interesting post about bitmap index. [...]

By: Timur Akhmadeev

Timur Akhmadeev — Thu, 25 Aug 2011 07:01:41 +0000

On a bit different but associated topic – utl_raw’s bit functions are very slow. And as far as I remember this is the case with statistics_level set to TYPICAL. From a colleague of mine who did some research on why, it looks like time is spent somewhere in accounting PL/SQL running time (v$session_time_model). No guarantee on that, but it could be tested.