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The f indicates the repetitive nature of the operations being performed
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As the three approaches to fetching data from a sequential le show, it is feasible to have more than one access method for one single le organization One le organization has to serve all applications, but for a given access application program or transaction the best access method should be chosen 3-8-2 Indexed Files Indexes are the dominant means to improve access to les They add a small amount of redundancy and provide rapid access to individual records for fetch and update Since the performance of indexed les is dominated by the number of index levels accessed, we can summarize the result and state that TF = Oindexes (x) = O(logy n) Within this growth factor are hidden many parameters, especially the fanout y, which can cause great di erences in observed performance
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Basic File-System Organization Fanout determines the performance of an index A large fanout reduces the number of index levels Fanout is increased by having large blocks and small entries
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Abbreviation of entries to increase fanout will be presented in Chap 4-2-1 We showed the alternative of static and dynamic index updating Static indexes were adequate for indexed-sequential les Dynamic indexes require much e ort when inserting records, but reduce reorganization requirements In situations where there is little data-processing sta they are preferable Programs for static indexes are simpler, but create chains We assumed uniform distributions when following index chains Nonuniform insertion distributions can increase TF considerably The problem gets worse if recently inserted records are referenced more frequently Pushthrough reduces that e ect Having multiple indexes which produce TIDs permits partial match retrieval without having to retrieve other than the goal records from the data le Other decisions which are important when designing indexes are Selection of attributes for indexing Use of record versus block anchors Immediate versus tombstone record deletion techniques
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Other design issues are covered in a description of index implementation, Chap 4-3 3-8-3 Review of Direct Files The outstanding feature of direct les is that the records can be accessed in constant time, O(1), so that growth of the le has no e ect on performance, as long as the density can be maintained If the density varies, then, for open adressing, n O( m n ) O(C 2n/m ) in common ranges of m/n Direct access trades exibility to gain both constant and high performance Since record placement is determined by a hashing computation, only one attribute of the record can be used for retrieval Another inherent restriction due to the computation is that data records are expected to be of xed length Hashing KATs are used to create the needed randomization Noe the Records of randomized direct les can be accessed only via one precise attribute value and not by range, and not serially To locate the next record in key sequence requires knowing or guessing the value of the key, and this violates our de nitions for GetNext operations Guessing a successor key would, in the great majority of fetches, result in a record-not-found condition In practice this choice is excluded from consideration Some solutions to the problems listed here are shown in Chap 4-6; they all carry additional access costs 3-8-4 Review of Ring Files The performance of ring structures is greatly a ected their initial design, and eventually by the distribution of insertions The depth of a search, x, is constant once
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Background and References
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the design is established, so that the performance then grows as the fanouts, y, grow on each level, so that performance is O(n) In this structure speed and complexity was traded to gain generality In practice they lose some of the generality, because it is rare that all conceptually possible access paths will be implemented in an application The user has then to know what paths will lead to the data Knowing which paths are most important causes the designer to select those that become rings No changes can be accommodated later when the users and their programs are set, even though that actual usage di ers from initial assumptions It is even di cult to determine that the design was wrong Measurements only show the implemented paths, and provide no direct information on other candidate paths The user of ring structures then has to be careful and use foresight during the design phase The features of thedirect le organization and the ring le organization, being quite di erent, actually so di erent that they complement each other, so that we will see them used together in Chap 4-7 For instance, entry points into ring structures are typically found by hashing Some of the di erences are Direct les One attribute Fetch Rigid Complex Ring les Many attributes Get-next Flexible Easy
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