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4-7-2 Pointers to the Master Record Not all the needed data for a query may be found in a record of a ring structure It may be neccessary to determine to which speci c ring this record belongs, and then locate its header or master record for data pertaining to all members of the ring
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An example could be a case where a speci c personnel record was found during a search for a certain skill This record can be interpreted by establishing its category, but to determine in which department the employee belongs, the chain has to be followed to its header
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In order to accelerate such searches, pointers may be kept in the member records which refer back to the master record When a record of a ring has been accessed, rst the record category is determined in order to be able to interpret the data and pointer types stored in the record This is achieved by identifying each record with a category code All rings of the same type (eg, personnel at various locations) will have records of the same record category If a master pointer exists, the master record can be quickly accessed Use of master pointers allows e cient use of storage, since all master-dependent information can be stored only in the master record The maintenance of master pointers is relatively easy, since both predecessor and successor records in the ring contain the same information There is, of course, again an additional space requirement
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Typical master-record types seen are Department, Supplier, Equipment If totals are maintained on a departmental level, relevant changes in a member employee record, such as a salary increase, can be re ected easily in the departmental total payroll eld
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Some implementers let master pointers share space with prior pointers The result has been called a coral ring and is illustrated also in Fig 4-39 Alternate records have prior and master pointers Locating the predecessor record now requires one or two accesses, and locating the header record also requires an average of 15 accesses
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4-7-3 Master Records with Indexes If the need exists to quickly nd individual member records in speci c rings, indexes may be associated with master records The resulting substructures have been discussed in the preceding sections Since records of a ring tend to be similar, and since rings are optimal if they are not very long, simple index structures will suf ce The relative bene ts of indexes increases if individual rings have poor locality Indexes become more interesting if they are not restricted to the ring hierarchy In the personnel le example, good use could be made of an index by employee name to permit access to employee records without using department rings 4-7-4 Rings and Direct Access Combining direct-access mechanism with a complex ring structure is e ective, since the ring structure makes no demands on the location (value of its own address) of a member record, whereas the direct-access methods are heavily dependent on location
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The combination allows rapid fetching of a record and subsequent collection of multiple records to satisfy a request for a data subset by following the chain for this speci c response In order to reach the header record of a ring, a standard identifying term can be used Figure 4-40 shows such an access Instead of name of the individual, the standard term ALL is given and combined with the class description Fire Brigade The pointer for this combination will lead to the header record for the Fire Brigade, so that the whole ring is available for processing Since the transformation controls the placement of the record, only one directaccess path can be provided per record For instance, in Fig 4-40 John can be found directly as Fire Brigade member #14, but he cannot also be accessed directly using his social security number The ability to control placement of ring members to increase locality has also been lost
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