Databases

Read e-book online Automated Physical Database Design and Tuning (Emerging PDF

By Nicolas Bruno

ISBN-10: 1439815674

ISBN-13: 9781439815670

Relational database platforms have considerably advanced when you consider that their inception over 30 years in the past. New functions at the moment are extra complicated than ever and tuning a construction procedure for functionality has turn into a severe but time-consuming job. This booklet indicates tips to use computerized platforms for time-efficient database tuning. the writer offers a close evaluation of the elemental learn that makes it attainable to instantly suggest alterations to the actual layout of database structures. The book provides a entire evaluation of the automatic tuning instruments that may be used to systematically discover the gap of choices and to steer database directors.

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Extra info for Automated Physical Database Design and Tuning (Emerging Directions in Database Systems and Applications)

Example text

Table Scan and Sorted Index Scan, which read the contents of R from the primary index or from an existing secondary index, respectively). Likewise, group 3 contains all the equivalent expressions for R S. , Join(1,2)) represents all operator trees whose root is Join, first child belongs to group 1, and second child 36 Automated Physical Database Design and Tuning belongs to group 2. In this way, a MEMO compactly represents a potentially very large number of operator trees. Also note that the children of physical groupExpressions also point to the most efficient groupExpression in the corresponding groups.

Use index E1 to obtain all RIDs of tuples satisfying Title = ’Engineer’ (each index contains, in addition to the index columns, the RID of each tuple). 2. Similarly, use index E2 to obtain all RIDs of tuples that satisfy Salary < 50000. 3. Intersect both lists of RIDs (this procedure is similar to a join). 4. Fetch the resulting records (which satisfy both predicates). This alternative can greatly reduce execution times because (1) the individual indexes E1 and E2 are in general smaller than the clustered index, (2) the 26 Automated Physical Database Design and Tuning intersected list of RIDs can be much smaller than either of the original lists, and thus much fewer RID lookups are needed, and (3) if the predicates use equalities, specialized intersection algorithms can be used that return RIDs in order of the clustered index, which accelerates subsequent lookups.

Examples of physical properties are the order of tuples in the result of a physical groupExpression (analogous to an interesting order in System-R) and the cost of the best execution plan rooted at a groupExpression. 2 Optimization Tasks The enumeration algorithm in Cascades is divided into several tasks. 7b for an example). Then, the optimizer schedules the optimization of the group corresponding to the root of the original query tree (group 5 in the figure). This task in turn triggers the optimization of smaller and smaller operator subtrees and eventually returns the most efficient execution plan for the input query.

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Automated Physical Database Design and Tuning (Emerging Directions in Database Systems and Applications) by Nicolas Bruno


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