The difference between 32bit and 64bit is the memory structures, ie. it = allows a larger than 4GB SGA. The bit version of the database does not = modify the blocksize or datafile structures that I am aware of. In fact = I believe you can move your database from 32bit to 64bit with few = changes. I believe it is as simple as changing your ORACLE_HOME to the = 64bit tree(assuming you have already installed it), runing the catalog = scripts and recompile all pl/sql. No data conversions are necessary. =20 Kenny Payton ChoicepointPRG Sr. Database Administrator -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of jtesta@xxxxxxxxxx Sent: Monday, April 26, 2004 4:02 PM To: oracle-l@xxxxxxxxxxxxx Subject: 32 bit/64 bit datafile? I know this was discussed in years gone by but I can't find the saved = info: A database was "upgraded" (changed word size) from 32 -> 64 bit. Without rebuilding the tablespaces/datafiles, my understanding is you don't gain much in the performance arena. Will a dump of a datafile header prove that it was originally created = w/32 bit oracle? thanks, joe ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------