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Oracle DB2

Introduction

This paper reviews the most significant differences between the market-leading database management system, Oracle Database, and its competitive product, IBM DB2 UDB, in the arena of performance and scalability.

Oracle Database regularly outperforms its competitors on a wide variety of industry-standard and ISV-specific benchmarks, and is widely recognized as the industry leader in database scalability.

This document describes the technical differences between both products that explain Oracle’s superior performance in these benchmarks as well as in real customer environments. After a short introduction to the differences in platform availability, the document focuses on the major techniques commonly used to ensure good performance and scalability in modern, enterprise-class, relational database systems: concurrency model, indexing, partitioning, parallel execution, and clustering. Finally, it briefly compares both products in terms of manageability of performance.

Key performance differentiators

Even though product availability is not directly linked to performance, true portability across a large variety of hardware and operating systems enables users to seamlessly upgrade or change their hardware systems without having to worry about changing, redesigning or rebuilding their applications. In other words, portability helps preserve the initial investments in application software and helps deliver performance consistency across multiple platforms.

Because Oracle Database is one single product, with a single code base ported on a large selection of hardware and operating systems, it provides the same support for performance features and tools across all platforms. But while IBM promotes DB2 as one product, it is in fact a family of products, with different code bases, that differ significantly from each other in terms of features and tools.

For clarity and simplicity, this paper only considers DB2 UDB Enterprise Server Edition (ESE) Version 8.2. Throughout this document, the terms DB2 and DB2 UDB will refer to the DB2 UDB ESE Version 8.2 product and the terms Oracle, Oracle Database and Oracle Database 10g will all refer to the latest version of Oracle Database, Oracle Database 10g Enterprise Edition, Release 2.