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- Newsgroups: comp.databases
- Path: sparky!uunet!shearson.com!newshost!wfinnert
- From: wfinnert@larry.shearson.com (Warren Finnerty)
- Subject: Re: Very large Decision Support database with Sybase ?!
- In-Reply-To: LAMCOLIN@HKGVM8.VNET.IBM.COM's message of Fri, 14 Aug 92 14:22:57 HKT
- Message-ID: <WFINNERT.92Aug14144526@larry.shearson.com>
- Sender: news@shearson.com (News)
- Organization: Lehman Brothers
- References: <19920813.232502.163@almaden.ibm.com>
- Date: Fri, 14 Aug 1992 19:45:26 GMT
- Lines: 48
-
- In article <19920813.232502.163@almaden.ibm.com> LAMCOLIN@HKGVM8.VNET.IBM.COM writes:
-
- > A project is looking for solution to support a DSS (end user oriented,
- > ad hoc type) with 60Gb of data from various data sources. The largest
- > table will have 33Gb of data.
-
- > Does any one of USENET readers/shops experience such large data volume with
- > Sybase?
-
- I doubt that there are more than 1 or 2 sites that large and I would be surprised
- if there are any happy ones :-).
-
- > Is there any physical limitation on the table size or database size with
- > Sybase?
-
- Each "device" cannot be larger than 32 GB. ( So plenty of room to spare )
-
- > Usually, Sybase says they are good in OLTP environment, but how about DSS
- > environment? Any reference or experience?
-
- Sybase is setup so that by default the optimiser (pessimiser) will handle all
- of the query plans. With tables that large there may be somewhat less than
- optimal plans (fo' sure) and there is no foolproof clean programatic plan
- access.
-
- > Moreover, whether all data should be placed on a single server or a network of
- > servers? Does Sybase has transparent access of data that partitioned over
- > several machines?
-
- SYBASE does *not* spread across nodes ( SMP it does ).
- Unless you want to look at NCR stuff ( oh IBM.... I guess not )
-
- Colin Lam, IBM Hong Kong, LAMCOLIN @ HKGVM8.VNET.IBM.COM
- ^^^
- Get a *GOOD* guru ( not a mock guru ).
- Plan on mirroring disks. ( Backup would take 60+ hours )
- Break into as many databases ( same server ) as poss.
- DBCC checkdb would take eons ( poss backup machine ).
- 4.9.1 + lots of memory ( some of the indexes would be HUGE )
-
- good luck
-
- NB ( create index w/ "data sorted" on first load )
- --
- warren finnerty | 388 Greenwich St.
- Lehman Brothers | NYC NY 10013
- "Back off man!" | wfinnert@shearson.com
-
-