C. Ozkan, A. Dogac, and M. Altinel. A Cost Model for Path Expressions in Object-Oriented Queries. Journal of Database Management 7(3), 1996. Home/Search Document Details and Download
Summary Related Articles Check |
This paper is cited in the following contexts:
Query Optimization using Horizontal Class.. - Bellatreche.. (Correct)
....an object oriented database schema design technique [14] which takes a class and generates a class hierarchy of HCFs so as to increase the efficiency of query execution, while providing additional semantics for the object oriented database scheme. Research has been done on cost function modeling [3, 5, 12, 21]. All these techniques assume that all classes in OODBs are unpartitioned, except the work in [10] which proposed an analytical cost model for a vertically partitioned class taking into account input output costs. However, the HCP algorithms either in relational or object oriented models ignored ....
C. Ozkan, A. Dogac, and M. Altinel. A cost model for path expressions in objectoriented queries. Journal of Database Management, 7(3):25--33, 1996.
Dynamic Query Optimization on a Distributed Object .. - Ozcan, Nural.. (1996) (15 citations) Self-citation (Dogac) (Correct)
....partial results changes from 4K to 1M and the selectivities are calculated with respect to cardinality and unique cardinality values assuming uniform distribution for each partial result. The calculation of the cardinality and unique cardinality values for intermediate results are performed as in [17]. Initial appearance times for the partial results are also randomly chosen assuming that the sizes of the partial results are uncorrelated with the appearance times but correlated with the type of the global subquery. Communication cost and conversion cost for intermediate results are taken to be ....
C. Ozkan, A. Dogac, M. Altinel, "A Cost Model for Path Expressions in Object-Oriented Queries", Journal of Database Management, Vol.7, No.3, June 1996.
Multidatabase Query Optimization - Evrendilek, Dogac, Nural, Ozcan (1997) Self-citation (Dogac) (Correct)
....where nbpages(C) is the estimated number of pages of the intermediate result C. 2 This definition of size selectivity is slightly different from the one based on the cartesian product, in that it is the proportion of the estimated size of the result to the input size. It has been observed in [26, 25, 27] that size selectivity is more effective. Definition 5.2 Per Unit Cost. The per unit cost of a join operation, C = L . R where L and R are intermediate results and J cost is the minimum possible cost of performing this join operation using different join implementation techniques, is denoted by ....
....3 Q 7 as shown in Figure 2f since (Q 2 Q 3 Q 7 ) L = Q 2 and (Q 1 Q 4 Q 5 ) L = Q 1 are neighbors. After contraction, the cardinality and unique cardinality of node Q 5 Q 4 Q 1 Q 2 Q 3 Q 7 are estimated given the unique cardinalities and cardinalities of the nodes Q 2 Q 3 Q 7 and Q 1 Q 4 Q 5 [26] [25]. Then, 1 (Q 5 Q 4 Q 1 Q 2 Q 3 Q 7 ,Q 6 ) is recalculated. In general, cost of all the edges emanating from a contracted node are recalculated. Note that if Rule 5.1 was not applied, then the sequence Q 1 Q 4 Q 5 Q 2 Q 3 Q 7 could be obtained, where Q 5 and Q 2 would be juxtaposed in the ....
[Article contains additional citation context not shown here]
C. Ozkan, A. Dogac, M. Altinel. "A Cost Model for Path Expressions in Object-Oriented Queries", Journal of Database Management, Vol.7, No.3, pp. 25-33, June 1996.
Cost Modeling and Estimation - For Olap-Xml Federations (Correct)
No context found.
C. Ozkan, A. Dogac, and M. Altinel. A Cost Model for Path Expressions in Object-Oriented Queries. Journal of Database Management 7(3), 1996.
Online articles have much greater impact More about CiteSeer.IST Add search form to your site Submit documents Feedback
CiteSeer.IST - Copyright Penn State and NEC