Oracle Performance Survival Guide: A Systematic Approach to by Guy Harrison

By Guy Harrison

Oracle functionality Survival Guide


A Systematic method of Database Optimization


The quick, whole, start-to-finish consultant to optimizing Oracle performance


Oracle functionality Survival Guide bargains a dependent, systematic, start-to-finish technique for optimizing Oracle functionality as successfully as attainable. major Oracle professional man Harrison indicates the way to maximize your tuning funding by means of targeting reasons instead of indicators, and via speedy deciding upon the components that bring the best “bang for the buck.”


Writing for DBAs and builders with all degrees of expertise, Harrison covers each quarter of Oracle functionality administration, from program layout via SQL tuning, rivalry administration via reminiscence and actual IO administration. He additionally provides up to date counsel for optimizing the functionality of the Oracle 11g free up 2. 


You’ll commence via gaining knowledge of Oracle based functionality tuning ideas and instruments, together with recommendations for tracing and tracking Oracle execution. Harrison illuminates the interplay among purposes and databases, publications you thru settling on tuning instruments, and introduces prematurely layout recommendations that bring about higher-performance functions. He additionally offers a suite of downloadable scripts for reporting on all points of database functionality.


Coverage includes

     •    “Tuning by means of layers,” the simplest, 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 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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Sample text

Java Pool—This cache contains Java stored procedures and other stored Java programs. Redo buffers and smaller redo strands—Cache redo log entries that have not yet been written to the redo logs on disk. DATA CACHING Oracle provides multiple levels of data caching. Traditionally (prior to 11g), data was cached only in the buffer cache. However, in 11g a SQL statement might find the data it needs in any of three memory locations: ❏ ❏ ❏ A client-side result set cache maintained by the Oracle 11g client libraries.

No Execute again? Re-execute the SQL statement (perhaps with new bind variables). No Close Cursor Deallocate memory and discard cursor. FIGURE 2-1 SQL Statement processing overview. CREATING THE CURSOR A cursor—or context area—is an area in memory in which Oracle stores your SQL statement and associated information. This includes the parsed and unparsed representation of your SQL statement, the execution plan, and a pointer to the current row. 16 Chapter 2 When SQL statement execution is complete, the memory associated with the cursor can be freed for other purposes or can be saved for re-execution.

Using hints you can specify join orders, type of access paths, indexes to be used, the optimization goal, and other instructions. 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.

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