Does SQL Server 2000 or Oracle 8i scale (linearly) to 100 terabytes in an OLTP environment? What reliability or data protection features are included in these?Do they have ability to rollback to a point in time?
I can only answer about Oracle 8i since I do not have too much experience with SQL Server. Hopefully, your question can be posed to a SQL Server expert.
Oracle has no problems scaling into the terabyte range. In fact, Oracle supports up to 512 petabytes, or 524,288 terabytes. While Oracle has no problems scaling linearly to this range, you mileage may vary due to hardware or application configurations. But a properly configured system should have no problems scaling to this range if Oracle is your backed.
As for reliability or data protection features... Oracle supports multiplexing of critical files (control file and online redo logs). Oracle also supports online block checking, but this can incur unwanted overhead. If high reliability is of key concern to you, then you'd want to employ Oracle Parallel Server (OPS). This lets you run multiple instances of the same database on multiple servers.
Oracle has done much more for reliability and data protection with Oracle 9i. Oracle 9i introduced many new features for realiability and data protection including Flashback Queries and Data Guard. Also, OPS was replaced with an easier to configure Real Application Clusters (RAC). You might want to check those out.
Does Oracle 8i have the ability to rollback to a point in time? Yes, but to a point. You can either restore from a backup and roll forward to that point in time, or you can use Oracle's Log Miner utility to generate SQL statements to undo transactions back to your point in time. Oracle 9i does have Data Guard and Flashback Queries which make rolling back to a point in time much easier.
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