The option for tablespace point in time recovery might turn out to be useful - equivalent to recovery on a per-user basis. The point about files is good though - I'm not sure that the theoretical limit of 65,000 can actually be reached in Oracle 8, and performance of checkpoints and queries against v$filestat can be pretty horrendous after the first 20,000 or so files.
However I think there are some issues which make 'hundreds' of users a liability anyway. Think how big the rowcache would have to be to keep all the dictionary data for hundreds of schema. Think how long the library cache chains could get if a large number of users were running textually identical SQL that resolved to different objects. Although the database could handle the strategy in terms of notional object limits and simple size, I'm not sure that you could avoid process contention on a remarkable scale. Jonathan Lewis http://www.jlcomp.demon.co.uk Next Seminar - UK, April 3rd - 5th http://www.jlcomp.demon.co.uk/seminar.html Host to The Co-Operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html Author of: Practical Oracle 8i: Building Efficient Databases -----Original Message----- To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> Date: 06 March 2002 23:06 |Ben, | |In addition to Dennis' comments, I would add that using a separate |tablespace for |each user doesn't make much sense to me. | |What is the perceived benefit of this? | |Oracle will accomodate a large number of users and objects without |putting each in their own tablespace. This seems like it would just |create a lot of extra work for you. | |An extreme number of database files can have an adverse affect |on performance as well. | |Jared | -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jonathan Lewis INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- 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).
