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Sequential les, with xed records, are easily mapped densely to a virtual address space, since we do not expect dynamic update The performance of les using explicit block read access and virtual direct access will be similar, except that there will be no bu ering to overlap computation with block reading in virtual systems Paging facilities do provide good bu ering when writing blocks, so that rewrite delays can be neglected except in terms of total system load Indexing is very desirable when using virtual memories, since it reduces the number of pages that have to be read The pointer obtained from an index entry is an address in the virtual space Only the high-order bits are kept and extended for reference by catenating log2 pagesize zeros The use of direct- le approaches is simpli ed by the large address space, although e ective space utilization has to be considered The le storage density can be very low if the le is not carefully allocated to the virtual address space The performance will be identical for similar values of m and Bfr Open addressing with linear searching can make good use of any pages which have been brought in due to prefetching in systems which attempt high-performance page scheduling for program usage
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In systems with a single address space, shared use of the space by multiple les using a common transformation simpli es control of storage allocation A marking convention using computable positions is required to indicate empty versus assigned record spaces With ring structures locality remains a concern if excessive paging load is to be avoided when rings are being traversed We nd then that the use of virtual storage does not change the approach to le design greatly, except that it does provide an alternative for the lowest level of le management A trivial le system, as described in Sec 4-1-1, is completely replaceable by virtual-storage access Some database systems have been built directly on top of such virtual storage system, but these systems have incorporated within themselves one or more of the le-organization techniques presented in order to control locality while paging A number of database systems for demonstration and educational purposes have not considered how to use the paging mechanisms e ectively, since the implementers did not expect to operate in a production environment An evaluation of the performance of les based on paging can be obtained by combining data on le behavior in terms of block reads and writes with measurements regarding paging-system performance and available workspace size Some paging algorithms assign priorities according to computer time to paging rate ratios Whether this will penalize or bene t le-oriented programs depends on the objectives of the system administrators who set the parameters
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The key information in an index duplicates information in the le records If this information is not needed as goal data when the record is accessed via other paths, the indexed attributes do not have to be kept in the goal records themselves This data may still be stored on an inactive backup le so that it remains available for periodic regeneration of the index If many elds are handled in this manner, a large portion of the goal le will not exist in active storage We will refer to data which is used only for accessing, but is not available for result generation as phantom data Requests for goal data using multiple attributes can be resolved completely within the indexes by matching addresses of the goal records Such an application is shown in Fig 4-46, which is an example taken from a le system designed for a casting agency selecting models for TV advertisements If all goal data are kept only in indexed form, the entire le has become a phantom le Files approaching this design have been called fully inverted les in the literature Another case of a phantom le can be found in bibliographic indexing Searches through indexes are made using logical combinations of request parameters which in the end produce a set of call numbers for books The call numbers are equivalent to the TIDs of the goal data The goals are the books on the shelves of the library A library which would always be accessed in this manner could store its books according to considerations other than the sequentiality of subject codes If, instead of call numbers, the system would provide the actual shelf number and position, then books could be stored according to size, to minimize space used, or according to
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