other differences besides: 1) does not lock the table; 2) does a full table scan
instead of full index scan; ?
Had read the article, but I am interested as to why Oracle is
doing a full table scan instead of full index scan for online index
Well, my name is not Tanel, but I'll jump in here and
point you to MetaLink Doc ID 272762.1.
Mark J. Bobak
ProQuest Information &
"There are 10 types of
people in the world: Those who understand binary, and those who
Is there any reason why Oracle does full table scans for online
rebuilds and not for offline.
Online rebuilds don't use existing index for
creating new. They do full table scan on the table.
However, in both cases, old index
segment is kept until new one is ready to use and switch to it is
done. Also the journal IOTs used for online rebuilds are stored in
the target tablespace, so if you've got lots of transaction s going on
while you are rebuilding the index onl ine, you need additional space in
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