By Tony Hasler
Professional Oracle SQL: Optimization, Deployment, and facts is ready optimizing person SQL statements, specifically on creation database platforms. This Oracle-specific booklet starts via assuming you have got already pointed out a specific SQL assertion and are contemplating taking steps to enhance its functionality. The e-book describes a scientific strategy in which to diagnose an issue assertion, determine a repair, and to enforce that repair thoroughly in a creation process. You'll examine not just to enhance functionality whilst it really is too sluggish, but in addition to stabilize functionality while it truly is too variable. You'll find out about method information and the way the Cost-Based Optimizer makes use of them to figure out an appropriate execution plan for a given assertion. That wisdom offers the basis from which to spot the foundation reason, and to stabilize and enhance performance.
Next after opting for an issue and the underlying root reason is to install position an answer. professional Oracle SQL: Optimization, Deployment, and facts explains the way to practice numerous treatments resembling altering the SQL assertion, including tricks, altering the actual layout, and extra, and the way they are often dropped at undergo on solving an issue as soon as and for all.
Rolling a transformation out easily is a crucial subject while facing tuning and optimization. professional Oracle SQL: Optimization, Deployment, and information doesn't allow you to down during this serious zone. The ebook comprises chapters of fine info from an skilled expert on the best way to thoroughly install adjustments into creation in order that your platforms ultimate working and on hand through the deployment process.
* Describes a scientific method of tuning Oracle SQL
* Explains how issues are meant to paintings, what can get it wrong, and the way to mend it
* Takes you thru the stairs had to stabilize functionality on your construction platforms
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Additional resources for Expert Oracle SQL: Optimization, Deployment, and Statistics
Enabling runtime data collection at the session or system level ALTER SESSION SET STATISTICS_LEVEL=ALL; ALTER SYSTEM SET STATISTICS_LEVEL=ALL; Any Oracle performance specialist would be remiss not to advise you of the potential for serious performance problems when you set STATISTICS_LEVEL to ALL at the system level. The main concern is that the performance of your application could seriously degrade as a result of the additional overhead. However, many experts would go further and suggest that you should only set STATISTICS_LEVEL to ALL at the system level for short periods of troubleshooting, and that it is never appropriate to leave it set to ALL at the system level permanently.
Listing 2-2 shows an example query where the CBO applies a heuristic query transformation inappropriately. Listing 2-2. display (format => 'BASIC +COST')); -- The resulting execution plan is this: Plan hash value: 2241143226 ----------------------------------------------------| Id | Operation | Name | Cost (%CPU)| ----------------------------------------------------| 0 | SELECT STATEMENT | | 293 (89)| | 1 | SORT AGGREGATE | | | | 2 | HASH JOIN | | 293 (89)| | 3 | TABLE ACCESS FULL | T4 | 2 (0)| | 4 | HASH JOIN | | 36 (9)| | 5 | TABLE ACCESS FULL | T2 | 2 (0)| | 6 | MERGE JOIN CARTESIAN| | 31 (0)| | 7 | TABLE ACCESS FULL | T1 | 2 (0)| | 8 | BUFFER SORT | | 29 (0)| | 9 | TABLE ACCESS FULL | T3 | 0 (0)| ---------------------------------------------------- Listing 2-2 creates four tables and then queries them.
There are two main reasons these bad plan selections often go unnoticed: • The first is that the performance of many SQL statements is of no concern. Suppose you have a five-hour batch that runs overnight and executes several thousand SQL statements. If one SQL statement takes 30 seconds to run instead of one second, it won’t matter much, particularly if other statements in the batch are running concurrently and this statement isn’t on the critical path. • The second reason that these bad plan selections go unnoticed is that there is no easy way to know how long an SQL statement should take to run; people’s expectations are often very low.
Expert Oracle SQL: Optimization, Deployment, and Statistics by Tony Hasler