Creating a Hash File for System Caching

To utilize system caching within the Hashed File stage, you must create a file with the caching attributes write immediate or write deferred. You can create such a file by selecting Allow stage write cache on the Input page of the Hashed File Stage dialog box. Specify the desired attributes through the Create file options dialog boxes. This dialog box includes the Caching attributes drop-down list box. The drop-down list box has the following entries:

• NONE. Does not assign any special caching attributes. This is the default.
• WRITE DEFERRED. Enables caching of the specified file using demand or lazy updating. (In the uvconfig file, if the DCWRITEDAEMON is enabled, then lazy updating is enabled. See Tuning Link Public Caching and System Caching.)
• WRITE IMMEDIATE. Enables caching of the specified file using synchronous writes.