Oracle performance survival guide: a systematic approach to by Guy Harrison

By Guy Harrison

A scientific method of Database Optimization the quick, entire, start-to-finish advisor to optimizing Oracle functionality Oracle functionality Survival consultant deals a established, systematic, start-to-finish technique for optimizing Oracle functionality as successfully as attainable. top Oracle specialist man Harrison indicates the right way to maximize your tuning funding via targeting explanations instead of signs, and by means of quick picking the components that bring the best “bang for the buck.” Writing for DBAs and builders with all degrees of expertise, Harrison covers each sector of Oracle functionality administration, from software layout via SQL tuning, rivalry administration via reminiscence and actual IO administration. He additionally offers up to date assistance for optimizing the functionality of the Oracle 11g unencumber 2. You’ll begin by way of learning Oracle based functionality tuning ideas and instruments, together with concepts for tracing and tracking Oracle execution. Harrison illuminates the interplay among functions and databases, publications you thru opting for tuning instruments, and introduces in advance layout thoughts that result in higher-performance functions. He additionally provides a suite of downloadable scripts for reporting on all points of database functionality. assurance contains • “Tuning by way of layers,” the best, highest-value method of Oracle functionality optimization • profiting from Oracle’s middle instruments for tracing, tracking, and diagnosing functionality • hugely effective database logical and actual layout, indexing, transaction layout, and API use • SQL and PL/SQL tuning, together with using parallel SQL strategies • Minimizing rivalry for locks, latches, shared reminiscence, and different database assets • Optimizing reminiscence and actual disk IO • Tuning genuine program Cluster (RAC) databases

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Oracle performance survival guide: a systematic approach to database optimization

A scientific method of Database Optimization the short, whole, start-to-finish consultant to optimizing Oracle functionality Oracle functionality Survival advisor deals a based, systematic, start-to-finish method for optimizing Oracle functionality as successfully as attainable. prime Oracle specialist man Harrison indicates easy methods to maximize your tuning funding by means of concentrating on motives instead of indicators, and through quick opting for the components that carry the best “bang for the dollar.

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The PGA is the memory available for the running program and is independent of the session that is currently using the process. The biggest part of the PGA is composed of work areas for sorts and temporary result sets. These work areas are created in the following circumstances: ❏ ❏ ❏ A temporary result set is created as an intermediate step in a SQL operation, most typically a join or subquery. For instance, in a complex join, each join creates a temporary result set that is then joined to the next table in the join sequence.

When Oracle parses a SQL statement, it must decide which approach will be fastest. 1 As of 10g, Oracle supports only the cost based optimization (CBO) approach. This means that the optimizer tries to calculate algorithmically the cost of each alternative SQL execution approach and chooses the one that is cheaper. Prior to 10g, the rule based optimizer (RBO) was also available. The rule based optimizer would not try to calculate costs but would instead use a relatively simple and predictable—but not always correct—set of rules (indexes are better than table scans, for example).

Use bind variables to ensure that SQL is sharable across and within sessions. This reduces parse overhead by increasing the chance that a matching SQL statement will be found in the shared pool. Enable array fetch to improve query and insert performance. Using the array fetch facility reduces the number of calls to Oracle and also reduces network traffic—especially in the client server environment. ” 20 Chapter 2 THE ORACLE QUERY OPTIMIZER SQL is a nonprocedural language: You define the data you want, not how to get it.

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