I was trying to execute this DDL, on my hosted database, a 10.1.0.5 standard edition running on solaris:
alter index CONTEXT_STEM_IDX rebuild online;This statement is supposed to rebuild a context index online, that is without preventing users from issuing queries against this index while the operation is in progress.
ORA-00439: feature not enabled: Online Index Build
Unfortunately online index build will only work on an Enterprise Edition and a feature comparison list made by Don Burleson back in 2003, presumably for Oracle 9i, seems to support this interpretation.
I tried to locate an official Oracle feature map and indeed i found two, a detailed Oracle Product Feature by Edition and also a web page, but, unfortunately, i can't tell whether this optional feature is listed or not, the closest match i could spot is called parallel index build.
While searching for "feature comparison", i stumbled also on this interesting whitepaper concerning Oracle 10G R2 Online Data Reorganization & Redefinition where there is absolutely no mention of which database edition supports which feature.
If anyone can come up with something more precise on this subject, i'll most delighted to include a link to the document.
At any rate, a less demanding:
alter index CONTEXT_STEM_IDX rebuild;worked well and rebuilt my index in a few seconds.
If you can't afford to run the risk of blocking any users, you may want to consider rebuilding the index during off-peak hours, by running a scheduled job.