RE: SQL Operation and Row size

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

stephane.paquette_at_standardlife.ca <mailto:stephane.paquette_at_standardlife.ca>

-----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)?

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