Computer Database Organization, 2nd Ed
Computer Database Organization, 2nd Ed
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To satisfy the record search, retrieval, and update requirements of a large multiple terminal APL application, a shared file system providing extensive field oriented search capabilities was designed and implemented. The file system consists of two major components: the Shared File Manager, which handles the sharing of files among multiple users, and the File Subsystem, which performs all file search and modification activities. With the exception of those portions of the system which perform the actual record input/output and data transmission between file users, both the File Manager and File Subsystem are written entirely in APL. The file structure offered by this system has been found to significantly simplify the file management portions of a broad class of applications.