January 2012
Intermediate to advanced
542 pages
11h 28m
English
Content preview from Oracle Database 11gR2 Performance Tuning CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Sorting—in-memory and on-disk
In this recipe, we will see how to diagnose in-memory and on-disk sort, and the differences between optimal, one-pass, and multi-pass sort.
Getting ready
We will use a SQL script from SQL*Plus environment to test in-memory and on-disk sort (without displaying tons of data on the screen).
Open a text editor (for example, vi on UNIX systems or notepad for Windows) and save the following script as 2602_05_TestSort.sql in a directory of your choice (the home directory, for example):
CONNECT sh@TESTDB/sh SET LINESIZE 120 SELECT * FROM v$sysstat WHERE name like '%sorts%'; -- Setting small sort area ALTER SESSION SET WORKAREA_SIZE_POLICY = 'MANUAL'; ALTER SESSION SET SORT_AREA_SIZE = 1000; ALTER SESSION SET SORT_AREA_RETAINED_SIZE ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.