At what step ? Oracle reads blocks, so from the datafile up to the db_buffer/db_cache its blocks. It would be logical that the filtering occurs after the where clause has chosen the data matching the search criteria, so in the select step which is the last step of the query operation.
Stephane Paquette Administrateur de bases de donnees Database Administrator Standard Life www.standardlife.ca Tel. (514) 499-7999 7470 and (514) 925-7187 [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> -----Original Message----- Daniel Fink Sent: 15 octobre, 2003 16:09 To: Multiple recipients of list ORACLE-L When retrieving data, does Oracle place just the columns of interest into the result set or does it place the entire row in the result set (and filter out the columns of interest later)? -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Daniel Fink 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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Stephane Paquette 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).
