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vsam Key Abbreviation
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Remarks Begin value first train: second train: third train: fourth train: fifth train: sixth train: seventh train: eighth train: ninth train: tenth train:
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This example shows the abbreviations if there were only one record per data train In practice one extreme record per train is chosen as anchor The anchor in vsam is the immediate successor record, that is, the rst record in the next train Otherwise it could not be determined if a reference to BIGLOW would be an existing entry in the third train or a new entry in the second train
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When the index is used, the entries have to be searched serially The number of matching high-order characters is counted If the number of characters that are provided in the index is equal to the number matched, the proper index entry has been found A proper match occurs also when the search-argument character in the current position is smaller than the matching index-entry key character, or if the index key entry is abbreviated so that no further key character is available
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The number of index entries within a train, y, can be substantial, and the basic procedure to reconstruct the keys for matching is very time-consuming In order to reduce the search time, a jump search, as described in Sec 4-2-2 is implemented, leading to cix = y (Eq 4-4) The index entries within one train are grouped initially into y sections After insertions and deletions the sizes of the sections may di er from this optimum The key for the last index entry in each section, the section key c j of Fig 4-17, s is abbreviated less, to permit reconstruction for jumping from the preceding section key c j 1 The rst search pass uses this section key and skips from one to the next s section using the section length indicator j to nd the proper section When the section has been found, a search pass for the appropriate entry is restricted within that section This additional pseudo-level does not require repeated entries of the key or pointers, only a reduced key abbreviation for the section keys
Index Search Pointers Pointers are also abbreviated The index pointers on level 1 to the data trains include only the displacement within a portion in terms of trains For instance, if there are 300 trains in one portion, = 300/28 = 2 8-bit bytes su ce for the pointer entry To calculate the byte address of the train, the contents of the pointer eld is multiplied by the train size and the beginning address of the portion is added
4-3-4 Sequential Access In vsam the index has to be read to process the data trains serially To obtain high-performance serial access, the use of higher levels of the index is avoided The linkage pointer ( ) is used to locate successive lowest-level index trains, and the data trains are fetched using the pointers of the index entries After many dynamic changes of a vsam le the trains will no longer be in a physical sequence Within each train, however, the record sequence has been maintained For large trains fewer seeks is required, but train size will be limited because of bu er capacity and the limits imposed by the relative addressing scheme A le with portions covering multiple cylinders will have its trains distributed over them, so that seeks during serial access still can add substantially to the time required to read the le
Locality Control There are some optional features to increase search performance through improved locality One of these features allows replication of the index on a track of a rotating device so that the average rotational latency for reading of the index can be reduced Other options provide for the close location of index le components and the data le itself to minimize seek times Index and data can also be placed on separate devices to provide overlap of access This is especially useful when processing the le serially
Sec 4-3
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