Download Oracle Database 11g Performance Tuning Recipes: A by Darl Kuhn, Bill Padfield, Sam R. Alapati PDF
By Darl Kuhn, Bill Padfield, Sam R. Alapati
Functionality difficulties are infrequently "problems" according to se. they're extra usually "crises" in which you’re harassed for effects via a supervisor status open air your cubicle whereas your mobile jewelry 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 booklet on idea. What you wish in that scenario is a e-book of strategies, and strategies 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 rapid aid with functionality concerns in relation to Oracle Database. The e-book takes an example-based strategy, in which every one bankruptcy covers a selected challenge area. inside of every one bankruptcy are "recipes," displaying by way of instance how you can practice universal projects in that chapter’s area. ideas within the recipes are subsidized through transparent factors of heritage and conception from the writer workforce. regardless of the job, if it’s performance-related, you’ll most likely discover a recipe and an answer during this book.
* presents confirmed strategies to real-life Oracle functionality problems
* bargains appropriate historical past and idea to help each one solution
* Written through a workforce of skilled database directors winning of their careers
Read or Download Oracle Database 11g Performance Tuning Recipes: A Problem-Solution Approach PDF
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Extra resources for Oracle Database 11g Performance Tuning Recipes: A Problem-Solution Approach
Create a temporary holding table to store the chained rows. 2. Delete the chained rows from the original table. 3. Insert the rows from the temporary table into the original table. Here’s a short example to demonstrate the prior steps. First create a temporary table that contains the rows in the EMP table that have corresponding records in the CHAINED_ROWS table: create table temp_emp as select * from emp where rowid in (select head_rowid from chained_rows where table_name = 'EMP'); Now delete the records from EMP that have corresponding records in CHAINED_ROWS: delete from emp where rowid in (select head_rowid from chained_rows where table_name = 'EMP'); Now insert records in the temporary table into the EMP table: insert into emp select * from temp_emp; If you re-analyze the table, there should be no chained rows now.
In these scenarios, Oracle will inspect every block below the high-water mark. If you notice that it takes a long time for a query to return results when there aren’t many rows in the table, this may be an indication that there are many unused blocks (because data was deleted) below the high-water mark. You can instruct Oracle to not re-adjust the high-water mark when shrinking a table. This is done via the COMPACT clause—for example: SQL> alter table inv shrink space compact; When you use COMPACT, Oracle defragments the table but doesn’t alter the high-water mark.
You suspect the table may be experiencing poor performance due to row chaining. Therefore you want to manually confirm with the Segment Advisor that a table has issues with row chaining. Solution You can manually run the Segment Advisor and tell it to specifically analyze all segments in a tablespace or look at a specific object (such as a single table or index). You can manually generate advice for a specific segment using the DBMS_ADVISOR package by executing the following steps: 1. Create a task.