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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Using asynchronous I/O
In this recipe we will see how to use asynchronous I/O to obtain better performance from our I/O subsystem.
How to do it...
The following steps will describe the use of asynchronous I/O:
- Connect to the database as
SYSDBA:CONNECT / AS SYSDBA - Verify whether asynchronous I/O is enabled:
SHOW PARAMETER FILESYSTEMIO_OPTIONS - Enable asynchronous I/O, if it is not enabled:
ALTER SYSTEM SET FILESYSTEMIO_OPTIONS=SETALL SCOPE=SPFILE; - Shut down the database instance:
SHUTDOWN IMMEDIATE - Start and open the database:
STARTUP OPEN - Verify the change in system configuration:
SHOW PARAMETER FILESYSTEMIO_OPTIONS
How it works...
The Oracle database may use synchronous or asynchronous I/O calls. With synchronous I/O, when an I/O request is submitted ...
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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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