Heuristic optimization transforms the query-tree by using a set of rules that typically (but not in all cases) improve execution performance .It uses which rules to do soSelect one:a.Perform projection early (reduces the number of attributes)b.Perform most restrictive selection and join operations (i.e., with smallest result size) before other similar operations.c. All of the aboved.Perform selection early (reduces the number of tuples)
Question
Heuristic optimization transforms the query-tree by using a set of rules that typically (but not in all cases) improve execution performance .It uses which rules to do soSelect one:a.Perform projection early (reduces the number of attributes)b.Perform most restrictive selection and join operations (i.e., with smallest result size) before other similar operations.c. All of the aboved.Perform selection early (reduces the number of tuples)
Solution
Heuristic optimization transforms the query-tree by using a set of rules that typically (but not in all cases) improve execution performance. It uses which rules to do so?
a. Perform projection early (reduces the number of attributes) b. Perform most restrictive selection and join operations (i.e., with smallest result size) before other similar operations. c. All of the above. d. Perform selection early (reduces the number of tuples)
To improve execution performance, heuristic optimization uses a set of rules. The options provided are:
a. Perform projection early (reduces the number of attributes) b. Perform most restrictive selection and join operations (i.e., with smallest result size) before other similar operations. c. All of the above. d. Perform selection early (reduces the number of tuples)
The correct answer is c. All of the above.
Similar Questions
Which is used to improve the performance of heuristic search?Question 9Answera. Quality of heuristic functionb.Quality of nodesc.Simple form of nodesd.None of the mentioned
1. How can we optimize the query performance during the selection refinement process?
cost-based query optimization consist ofSelect one:a.Annotate resultant expressions to get alternative query plansb.Generating logically equivalent expressions using equivalence rulesc.Choose the cheapest plan based on estimated costd.All of the above
The activity of choosing an efficient execution strategy for processing a query is called asSelect one:a. Query plan evaluationb. Query executionc. Query parsingd. Query optimization
What are some advanced query optimization techniques not mentioned earlierReview LaterUsing stored procedures instead of ad-hoc queries.Utilizing query hints to force specific execution plans.Employing database partitioning for large tables.Implementing data caching mechanisms.
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