Oracle Performance Tuning for 10gR2 by Gavin JT Powell

By Gavin JT Powell

Tuning of SQL code is mostly more cost-effective than altering the information version. actual and configuration tuning includes a look for bottlenecks that regularly issues to SQL code or info version concerns. construction a suitable info version and writing competently acting SQL code may give 100 percent+ functionality development. actual and configuration tuning usually supplies at such a lot a 25% functionality increase.

Gavin Powell exhibits that the imperative topic of Oracle10gR2 functionality Tuning is four-fold: denormalize facts types to slot functions; music SQL code in accordance with either the information version and the applying on the subject of scalability; create a well-proportioned actual structure on the time of preliminary Oracle install; and most crucial, combine ability units to acquire the easiest effects.

* absolutely up to date for model 10gR2 and offers all priceless transition fabric from model 9i
* contains all 3 facets of Oracle database tuning: information version tuning, SQL & PL/SQL code tuning, actual plus configuration tuning
* includes skilled assistance and real-world examples utilizing huge datasets Emphasizes improvement instead of working approach viewpoint

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This is because the column is functionally dependent on another column, whereas the other column is dependent on the primary key. 1 The Formal Definition of Normalization The entity must be in second normal form. Eliminates transitive dependencies, where a column is indirectly determined by the primary key. This is because that column is functionally dependent on a second column, where that second column is dependent on the primary key. Creates a new entity to contain any separated columns. 6 Boyce-Codd Normal Form (BCNF) In Boyce-Codd normal form, every determinant in an entity is a candidate key.

Oracle Database 8 and before were just Oracle Database. Oracle Database 8i and OracleDatabase 9i were Oracle Internet Databases. Oracle Database 10g is Oracle 10 grid Database. Oracle Database 10g is designed for use on computer grids, incorporating all sorts of different types of applications, including integrated messaging, enhanced scalability and performance, plus automated storage management. This book can be read in part or in whole by reading each of the separate parts. However, it is not a reference manual, so it is best read from start to finish because there is a lot of crossover between the three different disciplines.

Introduction xliii Make sure coders use bind variables in both PL/SQL and applications-embedded SQL code. 6) because of the cursor-sharing configuration parameter, but forcing cursor sharing lowers statistical accuracy and deteriorates optimizer performance. Beware of generic or generated SQL code, which is common at the applications level. This type of embedded SQL code can be very difficult to tune. Configuration and Physical Tuning Configuration Tuning Possibly one of the most effective tuning practices, especially as far as configuration tuning is concerned, is proper initial Oracle installation and configuration of your databases.

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