Hi, Sure that Sybase has not all the nice features Oracle has but I'm a bit surprised that you find it way too slow, do you have Sybase 12.5 ? 12.5 has interesting new features compare to 11.9 version.
"20 users doing ad hoc queries ..." I supposed you have a tool like Business Objects or Cognos and you're hiding the tables behind a user layer. "Some typical queries involve joining 2 tables each holding 2 Million rows." Are you using dimensionnal modeling ? You can have a dimension with a million lines but it's very rare. Have you built aggregates ? The only good way to speed up queries in a DW is to pre-calculate the data. Have you investigate to see what is the bottleneck in your application ? Depending on it you may or may not solve it by using Oracle DW features : partitionnning, star join, ,... HTH --- "Sackwitz, Antje" <[EMAIL PROTECTED]> a �crit�: > > Hi, Stephane, > > actually we have the database running on Sybase > but there it is way too > > slow ( as I > > told everyone here before). The application has > about 25 small and about > > 10 large > > tables. Data comes in every night about 100-250MB. > We have just about 20 > > users > > doing 'ad hoc' queries to the database via a > commercial tool. At the > > moment we > > have a test installation running on an IBM > computer having 2 processors a > > 2Ghz, 2 > > Gig RAM. Some typical queries involove joing 2 > tables each holding > > 2Million rows. > > Test situation will represent data warehouse after > being 3 years in > > production. > > Well, now the query takes about 15-20 Mintues > which is too slow for our > > sales > > people. I calculated, the machine scans about > 800000-1Mio rows per second. > > I thought, there are a lot of tuning possibilites > in Oracle that are not > > available in > > Sybase. Our system can run on both RDBMS. So as we > are buying a new > > machine > > for our database test environment I thought I > better find out which is > > best equipment > > for Oracle as I expect people to learn that Sybase > is not your number one > > when you > > go for a fdata warehouse. Overall we calculated, > that we add new muodules > > over > > next couple of years so finally DW will hold 20 > Gig data. > > Windows is chosen as sales folk here says Windows > machines are a lot > > cheaper > > than UNIX and the commercial tool needs some > server processes available > > not for > > Linux.... > > Any further recommendations? > > Regards, > > Antje > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > Author: Sackwitz, Antje > 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). ===== St�phane Paquette DBA Oracle, consultant entrep�t de donn�es Oracle DBA, datawarehouse consultant [EMAIL PROTECTED] ___________________________________________________________ Do You Yahoo!? -- Une adresse @yahoo.fr gratuite et en fran�ais ! Yahoo! Mail : http://fr.mail.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?paquette=20stephane?= 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).
