N. Kabra and D. DeWitt, "Opt++: An Object-Oriented Implementation for Extensible Database Query Optimization," submitted for publication, 1996. See also: http://www.cs.wisc.edu/~navin/research/opt++.ps Home/Search Document Details and Download
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Early Separation of Filter and Refinement Steps in Spatial .. - Park, Lee, Lee, Chung (4 citations) (Correct)
....and non spatial operations. Paradise uses the basic relational operators and optimization 1 Actually, GRAL is the acronym for the geo relational algebra. techniques for both the spatial and non spatial operations[24] Paradise s query optimizer is written using the OPT optimizer generator[17]. One of the most prominent features of OPT compared with other optimizer generators such as Volcano and Exodus is that the search strategy is also extensible. The above three optimizers obtain an arbitrary ordering between the spatial and non spatial operations. However, none of the above ....
....well as non spatial predicates[21] 4 A simple oid list and an oid pair list are also kinds of an oid tuple list. The operators in SOA are classified into algebraic operators and predicate operators. The algebraic operators are similar to the logical operators in Open OODB[5] MOOD[13] Paradise[17, 24], etc. They process inputs and outputs with a collection as a unit. The algebraic operators consist of the following: 1) relational algebra operators such as SEL(ECT) PROJ(ECT) JOIN, UNION, and DIFF(ERENCE) 2) NEST and UNNEST operators for set attributes in the extended relational model, 3) ....
N. Kabra and D. DeWitt, "Opt++: An Object-Oriented Implementation for Extensible Database Query Optimization," submitted for publication, 1996. See also: http://www.cs.wisc.edu/~navin/research/opt++.ps
Rule-Based Query Optimization, Revisited - Warshaw, Miranker (1999) (1 citation) (Correct)
.... been successful in providing environments friendly to extending the search space by easily adding new transformation rules, but they do not allow for extensibility in other dimensions, often fixing the search strategies [OZM96] Subsequent developers have moved to object oriented technologies [KAB94, OZM96]. These systems boast a well encapsulated and structured environment by defining the query representation and cost model as first class objects and procedures respectively. Hence, defining new database operators often only involves deriving a class from the designated super class and specializing ....
....extension of Venus. Unique features of VenusDB that suggested revisiting the issue of rule based query optimizers include, Embeddability in C and thus embeddability in database systems. VenusDB data definition language is precisely C . Thus, OO benefits seen in the optimizers developed by [OZM96, KAB94] with respect to the representation of operator trees can be exploited identically. A well structured (modular) rule environment that allows a user to assert some procedurally inspired control over the execution while maintaining fixed point semantics [BRG94] The addition of the event ....
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N. Kabra, D. J. Dewitt. "Opt++: An Object-Oriented Implementation for Extensible Database Query Optimization." Unpublished paper located in the SHORE papers home page, http://www.cs.wisc.edu/shore/shore.papers.html.
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