By Sitansu S. Mittra
Scope The ebook offers entire assurance of database functionality tuning and opti- zation utilizing Oracle 8i because the RDBMS. The chapters include either theoretical discussions facing ideas and method in addition to real SQL scripts to enforce the method. The booklet combines conception with perform which will make it important for DBAs and builders regardless of whether or not they use Oracle 8i. Readers who don't use Oracle 8i can enforce the rules through scripts in their personal written for the actual RDBMS they use. i've got established each one script for accuracy and feature incorporated the pattern outputs generated from them. An operational database has 3 degrees: conceptual, inner, and exterior. The c- ceptual point effects from facts modeling and logical database layout. whilst it's imp- mented through an RDBMS akin to Oracle, it truly is mapped onto the interior point. Database - jects of the conceptual point are linked to their actual opposite numbers within the inner point. An exterior point effects from a question opposed to the database and, as such, presents a window to the database. there are numerous exterior degrees for a unmarried conceptual level.
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Extra resources for Database Performance Tuning and Optimization: Using Oracle
Therefore, a data search may have to traverse many fragments to access the required data. 9) in a table can occur due to inserts and updates of records when its PCTFREE parameter is set incorrectly or when columns with VARCHAR2 data types that were initially NULL start getting updated with nonnull values. Excessive chaining degrades performance because retrieval of chained data involves following a chain of pointers, which is slower than retrieving physically contiguous data. Tables with LONG or LONG RAW data types deserve special attention since they almost always cause chaining.
These tasks affect the three levels of a database known as external, conceptual, and internal that are described in Chapter 2. The following are the major tasks in this phase. (a) Monitor the performance at the internal level by checking tablespace fragmentation, chaining of rows in tables, proper sizing of tables and indices, proper allocation of extents to them, sizing of the system global area (SGA) and its components, and computation of various hit ratios. TXT to track overall database performance.
The terms relation, tuple, and attribute have their origin in mathematics, and the same applies to functional dependency and transitive dependency. Under his leadership the IBM System Research Institute built System R, the very first RDBMS, although it was never marketed for commercial use. SDLC and SMLC are tangentially related to the database application development process. Mittra  offers adequate coverage of the related concepts. Mittra  discusses how SDLC and SMLC are used in a client-server environment.