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 quickly, entire, start-to-finish advisor to optimizing Oracle performance
Oracle functionality Survival Guide bargains a based, systematic, start-to-finish method for optimizing Oracle functionality as successfully as attainable. prime Oracle professional man Harrison exhibits how one can maximize your tuning funding through targeting factors instead of indicators, and via speedy deciding on the parts that bring the best “bang for the buck.”
Writing for DBAs and builders with all degrees of expertise, Harrison covers each zone of Oracle functionality administration, from program layout via SQL tuning, rivalry administration via reminiscence and actual IO administration. He additionally provides up to the moment counsel for optimizing the functionality of the Oracle 11g unencumber 2.
You’ll commence by means of gaining knowledge of Oracle dependent functionality tuning rules and instruments, together with concepts for tracing and tracking Oracle execution. Harrison illuminates the interplay among purposes and databases, courses you thru determining tuning instruments, and introduces prematurely layout thoughts that result in higher-performance purposes. He additionally provides a suite of downloadable scripts for reporting on all features of database functionality.
• “Tuning by means of layers,” the simplest, highest-value method of Oracle functionality optimization
• taking advantage of Oracle’s center 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 rivalry for locks, latches, shared reminiscence, and different database resources
• Optimizing reminiscence and actual disk IO
• Tuning genuine program Cluster (RAC) databases
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Extra resources for Oracle performance survival guide : a systematic approach to database optimization
2 EXPLAINING SQL STATEMENTS In the previous chapter we described the concept of the execution plan: the sequence of steps that the optimizer determines it will use to execute a SQL statement. Without knowledge of this execution plan, you have only a vague understanding of how your SQL is being processed.
For most databases, optimizing the datafiles for read activity makes the most sense because Oracle sessions do not normally wait for datafile writes; the database writer process (DBWR) writes to disk asynchronously. However, if the DBWR cannot keep up with database activity, sessions need to wait for the DBWR to catch up. Likewise, we need to ensure that the flashback and redo log writer processes can keep up; otherwise, user sessions need to wait for these processes as well. Chapters 21 and 22 covers the issues associated with optimizing disk IO: ❏ ❏ ❏ ❏ Understanding the Oracle IO mechanisms—buffered IO and direct IO, redo and archive log IO, flashback IO, and other mechanisms.
A partitioned From the Library of Lee Bogdanoff 30 Chapter 2 table or index, however, will consist of multiple segments—each segment representing a partition. Tables and indexes can also consist of multiple segments when they have a LOB (embedded large object), a nested table, or are index organized. TABLESPACES AND DATA FILES Segments must belong to a specific tablespace that might define the storage characteristics—block size, for example—of the segment. Tablespaces are composed of multiple datafiles that can be represented as operating system files, raw disk partitions, or as Automatic Storage Management (ASM) files.