By Darl Kuhn, Bill Padfield, Sam R. Alapati
Functionality difficulties are hardly "problems" consistent with se. they're extra frequently "crises" within which you’re burdened for effects by means of a supervisor status open air your cubicle whereas your cellphone earrings with queries from the assistance table. You won’t have the time for a leisurely perusal of the manuals, nor to lean again and browse a e-book on concept. What you would like in that scenario is a booklet of recommendations, and options are accurately what Oracle Database 11g functionality Tuning Recipes delivers.
Oracle Database 11g functionality Tuning Recipes is a prepared reference for database directors short of speedy aid with functionality matters in terms of Oracle Database. The ebook takes an example-based procedure, in which each one bankruptcy covers a selected challenge area. inside of each one bankruptcy are "recipes," displaying by way of instance the right way to practice universal initiatives in that chapter’s area. options within the recipes are subsidized via transparent factors of historical past and concept from the writer staff. regardless of the job, if it’s performance-related, you’ll most likely discover a recipe and an answer during this book.
* offers confirmed ideas to real-life Oracle functionality problems
* bargains correct heritage and idea to help every one solution
* Written through a staff of skilled database directors winning of their careers
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Additional info for Oracle Database 11g Performance Tuning Recipes: A Problem-Solution Approach
1-13. Compressing Data for Direct Path Loading Problem You’re working with a decision support system (DSS)-type database and you want to improve the performance of an associated reporting application. This environment contains large tables that are loaded once and then frequently subjected to full table scans. You want to compress data as it is loaded because this will compact the data into fewer database blocks and thus will require less I/O for subsequent reads from the table. Because fewer blocks need to be read for compressed data, this will improve data retrieval performance.
Usually, dropping and re-creating a table is acceptable only in a development or test environment. 1-8. Displaying Automated Segment Advisor Advice Problem You have a poorly performing query accessing a table. Upon further investigation, you discover the table has only a few rows in it. You wonder why the query is taking so long when there are so few rows. You want to examine the output of the Segment Advisor to see if there are any space-related recommendations that might help with performance in this situation.
You can verify that compression has been enabled for a table by querying the appropriate DBA/ALL/USER_TABLES view. This example assumes that you’re connected to the database as the owner of the table: select table_name, compression, compress_for from user_tables where table_name='REGS_DSS'; 34 CHAPTER 1 ■ OPTIMIZING TABLE PERFORMANCE Here is some sample output: TABLE_NAME COMPRESS COMPRESS_FOR ------------------------------ -------- -----------REGS_DSS ENABLED BASIC The prior output shows that compression has been enabled in the basic mode for this table.