40 A. Gupta, I.S. Mumick, and V.S. Subrahmanian. Maintaining views incrementally. In Proc. of the ACM SIGMOD Int'l Conf. on Management of Data, pages 157-166, Washington, D.C., May 1993. Home/Search Document Not in Database Summary Related Articles Check |
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Derivation of Incremental Equations for Nested Relations - Jixue Liu Millist (2000) (Correct)
....data collections that are derived from source data. When the source data is updated, the materialized views need to be maintained in one of two ways: recomputing the views from scratch or maintaining the views incrementally. The incremental method is generally considered to be less expensive [6, 3] when update sizes are small in relation to the sizes of source data. The incremental method computes the new view using the updates to the source data and the old view. For example, let the view V be de ned in at relational model (using set semantics) as V = r 1 . r 2 . For an insertion r 1 to ....
....view. For example, let the view V be de ned in at relational model (using set semantics) as V = r 1 . r 2 . For an insertion r 1 to r 1 , the incremental technique calculates the change to V as V = r 1 . r 2 and computes the new view, V , by V = V [V (where V equals r 1 . r 2 ) [6, 3]. In this example, the equation (r 1 [ r 1 ) r 2 = r 1 . r 2 [ r 1 . r 2 guarantees the result of incremental computation is the same as recomputation. This equation is called an incremental equation (IE) for the Join operator when an update is an insertion. The structure of an IE depends ....
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Ashish Gupta and Inderpal S. Mumick. Maintaining view incrementally. SIGMOD Conference, 1993.
DyDa: A Compensation Based Approach to Dynamic Data.. - Chen, Zhang.. (2002) (Correct)
....extent. Now let us brie y justify the formulas de ned above. Assume the new view extent is V 2 1 : 1 R n = R 1 R 1 ) 1 (R 2 R 2 ) 1 : 1 (Rn Rn ) Equation 7 is correct for any R i , R i and R i , and in fact is similar to the batch view maintenance algorithm described in [Ash93] Thus our focus is to decide if R i , R i and R i are correctly derived for the corresponding source updates. Assume the combined updates of R i are DU i and SC i , respectively. First, if SC i is empty, then only data updates have occurred. In this case R i , R i and R ....
Ashish Gupta and Inderpal Singh Mumick and V. S. Subrahmanian. Maintaining Views Incrementally. In Proceedings of SIGMOD, pages 157-166, 1993.
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....Figure 5.3 Figure 5.4 10 20 30 40 50 0.2 0.4 0.6 0.8 1 time Flt. PullUp 0 10 20 30 40 50 60 1 2 5 10 20 50 time PullUp PushDown S updated techniques in [RSSB00] to materialized views selection and maintenance. Our work is also related to materialized view maintenance [BLT86][GMS93] [Han87] SR88] In our method, intermediate files are updated incrementally. Hellerstein [HS93] Hel94] Hel98] proposed a method called Predicate Migration to produce an optimal plan for queries with expensive methods. Our work is related to this work in that we also try to find an optimal plan ....
A. Gupta, I. S. Mumick, V. S. Subrahmanian, "Maintaining Views Incrementally," SIGMOD Conference 1993: 157-166
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.... and is received by the warehouse manager, the incremental change is computed by the query in Equation 1: 1) The query in Equation 1 is computed by sending down subqueries to the respective information sources [9,10]. For simplicity, let us focus on SPJ views here, while in a later discussion section we discuss possible generalizations. The attributes are the columns in the view that are being projected out from the query result. The predicates are used to filter the query result. To explain the generation ....
A. GUPTA, I. S. MUMICK, AND V. S. SUBRAHMANIAN, Maintaining Views Incrementally, in Proceedings of SIGMOD, 1993, pp. 157--166.
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40 A. Gupta, I.S. Mumick, and V.S. Subrahmanian. Maintaining views incrementally. In Proc. of the ACM SIGMOD Int'l Conf. on Management of Data, pages 157-166, Washington, D.C., May 1993.
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A. Gupta, I. S. Mumick, and V. S. Subrahmanian. Maintaining views incrementally. In Proc of the 1993 ACM SIGMOD Intl. conference on Management of data, pages 157--166. ACM Press, 1993.
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A. Gupta, I. Mumick, and V. Subrahmanian. Maintaining views incrementally. In ACM SIGMOD Conference, pages 157--166, 1993.
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