Differnet between 8i and 9i

There is any different between oracle 8i and 9i.
recently we upgraded from 8i to 9i after that the applications are working very fast.
anybody know what is the reason.
Thank, Raghu.K

just a glance, new features in 9i
Whats new in Oracle9i?
     Automatic undo management
     Automatic Segment Space Management
     Rename Column
     Rename Constraints
     Data Compression
     Index Key Compression
     Flashback Query
     Object Privileges by DBA
     Default Temporary Tablespace
     Resumable Space Allocation
     List Partitioning
     Range-list Partitioning
     External Tables
     Tuning Advisories
     Dynamic Sampling of Optimizer Statistics
     Dynamic Database Parameters
     Dynamic Memory Management / Automatic Memory Tuning
     Server Parameter File
     Oracle Managed Files
     Using multiple block sizes
     Multi-table INSERT
     Index Skip Scan
     DBMS_METADATA
     DBMS_XPLAN
     ANSI Style Outer Joins
     Random Sampling of Data
     New Data Types
     Upsert or the MERGE statement
regards

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Differnet between 8i and 9i

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