Juan, Setting NOLOGGING on a tablespace does not, in and of itself, do anything. That setting becomes the default for any segments created in the tablespace. Further, NOLOGGING does not have an effect on all operations. Actually, it's quite a small subset of operations that NOLOGGING will have an effect on. Some of these include: index creation, index rebuild, insert /*+ APPEND */, just to name a few. It's important to understand NOLOGGING and how it works, so that you may understand the recovery implications. Blocks loaded using NOLOGGING will NOT be recoverable till a backup is taken after the NOLOGGING operation is complete. More details on NOLOGGING can be found at: http://www.jlcomp.demon.co.uk/faq/nologging.html _disable_logging, on the other hand, says "I don't care about this database, don't do any logging, if the database crashes, it's worthless, game reset, start over." This is quite different from, and far more dangerous than, NOLOGGING operations. Hope that helps, -Mark -- Mark J. Bobak Senior Oracle Architect ProQuest Information & Learning "There are 10 types of people in the world: Those who understand binary, and those who don't." -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Juan Carlos Reyes Pacheco Sent: Thursday, February 02, 2006 1:40 PM To: Li-Shan Cheng Cc: oracle-l@xxxxxxxxxxxxx Subject: Re: Disable logging in tablespace vs using hidden parameter _disable_logging HI Li, thanks I know that, I RTFM, It is an open question about how to get the _disable_logging effect without using that parameter. What I'm asking is about applying no logging to all tablespaces before import? Compared to setting _disable_logging? I don't know if some one knows about improvements. For example "setting nologgin to all tablespace I saved 1% of time, but I set this other parameter too, etc.." And any other comment about reducing logging activity without using the _disable_logging parameter. :) -- //www.freelists.org/webpage/oracle-l
BEGIN:VCARD VERSION:2.1 N:Bobak;Mark FN:Bobak, Mark ORG:ProQuest Information and Learning;Database Group TITLE:Software Architect, Sr-TPD TEL;WORK;VOICE:734.975.6086 ADR;WORK:;ECC4-N01E04;1400 Eisenhower Parkway LABEL;WORK;ENCODING=QUOTED-PRINTABLE:ECC4-N01E04=0D=0A1400 Eisenhower Parkway EMAIL;PREF;INTERNET:Mark.Bobak@xxxxxxxxxxxxxxx REV:20051213T223654Z END:VCARD