Operating systems and Database systems are two major research and commercial areas. Due to the different targets of services, database systems once complained about poor operating system supports for database system. What is the situation today? We choose Sun Solaris as an example of modern operating system, examining its various components. We also go over PostgreSQL as the example of database system. Our conclusion is, modern operating systems have provided lots facilities to help database systems, and database systems are taking advantage of them.

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