By Guy Harrison
Oracle functionality Survival Guide
A Systematic method of Database Optimization
The quickly, whole, start-to-finish consultant to optimizing Oracle performance
Oracle functionality Survival Guide deals a dependent, systematic, start-to-finish method for optimizing Oracle functionality as successfully as attainable. best Oracle specialist man Harrison exhibits the way to maximize your tuning funding by means of concentrating on factors instead of indicators, and through fast picking out the parts that convey 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 program layout via SQL tuning, rivalry administration via reminiscence and actual IO administration. He additionally offers up to the moment counsel for optimizing the functionality of the Oracle 11g unencumber 2.
You’ll commence through studying Oracle based functionality tuning ideas and instruments, together with strategies for tracing and tracking Oracle execution. Harrison illuminates the interplay among purposes and databases, courses you thru deciding upon tuning instruments, and introduces in advance layout suggestions that bring about higher-performance functions. He additionally provides a suite of downloadable scripts for reporting on all elements of database functionality.
• “Tuning via layers,” the simplest, highest-value method of Oracle functionality optimization
• taking advantage of 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 techniques
• Minimizing competition for locks, latches, shared reminiscence, and different database resources
• Optimizing reminiscence and actual disk IO
• Tuning genuine software Cluster (RAC) databases
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Oracle functionality Survival consultant a scientific method of Database Optimization the short, whole, start-to-finish advisor to optimizing Oracle functionality Oracle functionality Survival advisor bargains a established, systematic, start-to-finish method for optimizing Oracle functionality as successfully as attainable.
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Additional info for Oracle Performance Survival Guide: A Systematic Approach to Database Optimization
An optimizer hint appears as a comment following the first word of the SQL statement, such as SELECT, INSERT, UPDATE, MERGE, or DELETE. A hint is differentiated from other comments by the presence of the plus sign (+) following the opening comment delimiter (/*). For example, the FULL hint in the following SQL instructs the optimizer to resolve this statement via a full table scan, even if the optimizer calculates that an index lookup would be more optimal. ” OUTLINES, PROFILES, AND BASELINES Adding hints—or otherwise changing SQL statement syntax to get a desired execution plan—is okay if you’re developing new SQL but not useful if you are trying to tune SQL in a live system.
Within the database, segments represent the logical containers for various types of data. TABLES Tables are the fundamental logical unit of database storage, corresponding to an entity in the relational model. A table normally consists of a two-dimensional structure of columns and rows, although some of the Oracle object-relational structures stretch or break this definition. Oracle offers a wide variety of table types, each of which has distinct logical or physical storage characteristics: ❏ ❏ ❏ ❏ ❏ ❏ ❏ ❏ Heap organized table—This is the default table type; if you use CREATE TABLE without any specific options, you end up with a heap table.
STAGE 4: OPTIMIZING DISK IO At this point, we’ve normalized the application workload—in particular the amount of logical IO demanded by the application. We’ve eliminated contention that might be blocking—and therefore masking—those logical IO requests. Finally, we’ve configured available memory to minimize the amount of logical IO that ends up causing physical IO. Now—and only now—it makes sense to make sure that our disk IO subsystem is up to the challenge. To be sure, optimizing disk IO subsystems can be a complex and specialized task, but the basic principles are straightforward: 10 Chapter 1 ❏ ❏ Ensure the IO subsystem has enough bandwidth to cope with the physical IO demand.