I think you'll find that what Oracle actually says is that rather than define a unique index, you should define a unique constraint (which does create a unique index to enforce the constraint)
there is no recommendation, that I have heard of, that you do not define uniqueness on columns other than the primary key column --- Anna Li <[EMAIL PROTECTED]> wrote: > Thanks for all of you who replied the message. I apologize for not > explaining the problem clearer. Actually, the error was reported at > 13:35:13pm from the application. There is a column called > date_created in > the table that records what time the record was created. The value > of > date_created for the record that caused error message is the same as > reported from application. That's why I said that the record was > inserted > into the table successfully. > > I know Oracle recommends that we do not explicitly define unique > indexes on > tables. Why? > > Anna > > > >From: "Jacques Kilchoer" <[EMAIL PROTECTED]> > >Reply-To: [EMAIL PROTECTED] > >To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > >Subject: RE: unique constraint violation problem > >Date: Mon, 07 Jul 2003 12:59:25 -0800 > > > >My explanation would be that the record was NOT inserted > successfully into > >the table. Proof of that would be that there are no duplicate > records in > >the table. > > > > > -----Original Message----- > > > From: Anna Li [mailto:[EMAIL PROTECTED] > > > > > > I created a unique index on a table called REGISTRATION_K, > > > but no unique > > > constraint. Last week when the application tried to insert a > > > record into > > > the table, we got following error in the log file: > > > > > > Oracle::st execute failed: ORA-00001: unique constraint > > > (REGISTRATION_K) > > > violated > > > > > > However, the record was inserted into the table successfully. > > > There are no > > > duplicate records in the table. Could anyone explain why? > > > > > > Any input will be highly appreciated. Thanks in advance. > >-- > >Please see the official ORACLE-L FAQ: http://www.orafaq.net > >-- > >Author: Jacques Kilchoer > > INET: [EMAIL PROTECTED] > > > >Fat City Network Services -- 858-538-5051 http://www.fatcity.com > >San Diego, California -- Mailing list and web hosting > services > >--------------------------------------------------------------------- > >To REMOVE yourself from this mailing list, send an E-Mail message > >to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > >the message BODY, include a line containing: UNSUB ORACLE-L > >(or the name of mailing list you want to be removed from). You may > >also send the HELP command for other information (like subscribing). > > > > _________________________________________________________________ > MSN 8 with e-mail virus protection service: 2 months FREE* > http://join.msn.com/?page=features/virus > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Anna Li > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Rachel Carmichael INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
