How SQL Server compares to Oracle and DB2

SQL Server versus Oracle, DB2 vs. Pros:

1. Openness:

SQL Server

Can only run on Windows, without the slightest openness, the stability of operating system systems is very important to the database. Windows9x Series products are focused on desktop applications, NT server only for small and medium enterprises. And the reliability, security, and scalability of Windows platforms are very limited. It is not as time-tested as UNIX, especially when it comes to dealing with the critical business of large amounts of data.

Oracle

Can be run on all major platforms (including Windows). Full support for all industrial standards. Adopt a fully open policy. Enables customers to choose the solution that best suits them. Full support to developers.

DB2

Can be run on all major platforms (including Windows). Most suitable for mass data. DB2 is the most widely used enterprise class, and almost 85% of the world's 500 largest companies use DB2 database servers, while the country accounts for about 5% of the 97.

2. Scalability, parallelism

SQL Server

Parallel implementation and coexistence models are not mature. It is difficult to handle the increasing number of users and data volumes. Scalability is limited.

Oracle

Parallel servers extend the capabilities of WINDOWNT by enabling a set of nodes to share work in the same cluster, providing high-availability and highly scalable clusters of solutions.

If WindowsNT does not meet the needs, users can move the database to UNIX.

DB2

DB2 has a good parallelism. The DB2 extends the database management to the parallel, multi-node environment.

A database partition is a part of a database that contains its own data, indexes, configuration files, and transaction days

Log Database partitions are sometimes referred to as nodes or database nodes

3. Safety

SQL Server

No security certificate was obtained.

Oracle Server

Obtain the highest certification level ISO standard certification.

DB2

Obtain the highest certification level ISO standard certification.

4. Performance

SQL Server

Poor performance when multiuser

Oracle

The highest performance, keeping windowsnt under the tpc-d and Tpc-c world records.

DB2

Suitable for Data warehouse and online things processing performance is high.

5. Client Support and Application mode

SQL Server

c/S structure, only support Windows customers, you can connect with ADO,DAO,OLEDB,ODBC.

Oracle

Multi-level network computing, supporting a variety of industrial standards, can be used ODBC,JDBC,OCI and other network clients to connect

DB2

Cross-platform, multi-layer structure, support ODBC,JDBC and other customers

6. Easy to operate

SQL Server

Simple to operate, but only graphical interface.

Oracle

More complex, providing both GUI and command lines, operating the same under WindowsNT and UNIX

DB2

Simple to operate, provide GUI and command line, operate the same under WindowsNT and UNIX

7. Risk of Use

SQL Server

Full rewrite of the code, experienced a long period of testing, continuous delay, many features need time to prove. Not very compatible with early products. Use requires a certain risk.

Oracle

Long-time development experience, completely backward-compatible. has been widely used. There is no risk at all.

DB2

It is widely used in mega-enterprises and has good backward compatibility. Risk is small.