What is the significant difference between IIS 6.0and IIS 5.0?
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We know that Microsoft has redesigned IIS 6.0 to take advantage of the basic Windows kernel HTTP.sys. This gives it built-in response and request caching and queuing capabilities, and the ability to route application process requests directly to the worker process, thereby improving reliability and performance.
IIS 6.0introduces two modes of operation for configuring the application environment: worker process isolation mode and IIS 5.0isolation mode. The default quarantine mode when installing IIS 6.0depends on whether you are performing a fresh installation or upgrade.
After a fresh installation of IIS 6.0, IIS runs in worker process isolation mode.
After upgrading from an earlier version of IIS 6.0, the quarantine mode is the same as that configured in the previously installed version of IIS 6.0.
After upgrading from IIS 5.0 or IIS 4.0, IIS 6.0 runs in IIS 5.0 isolated mode by default, which maintains compatibility with existing applications.
IIS 5.0isolation mode
The IIS 5.0isolation mode manages application processes in a similar way to process management in IIS 5.0.All in-process applications run within Inetinfo.exe and out-of-process applications run in separate DLL hosts. Some existing applications may not be able to run concurrently or store session state separately from the application. Therefore, running a process in IIS 5.0isolation mode ensures compatibility with most existing applications.
Configure database configuration
The configuration database for IIS 6. 0 is stored as an XML file, rather than in the binary format of previous versions. The location is still in place, but the mode of operation (update, rollback, restore, and extension) has changed. There are two important files, not one: MetaBase.xml and MBSchema.xml.
For more information about the IIS configuration database, see about configuring the database.
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