June 2001
Intermediate to advanced
384 pages
11h 36m
English
book
Oracle Essentials: Oracle9i, Oracle8i and Oracle8, Second Edition
by Rick Greenwald, Robert Stackowiak, Jonathan Stern
Content preview from Oracle Essentials: Oracle9i, Oracle8i and Oracle8, Second EditionBecome 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,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
Advanced Queuing
In the 1980s, message-oriented middleware (MOM) gained popular usage. MOM uses messages to transmit information between systems. It doesn’t require the overhead of a two-phase commit because the MOM itself guarantees the delivery of all messages. Products such as IBM’s MQSeries store control information (message destination, expiration, priority, and recipients) and the message contents in a file-based queue. Delivery is guaranteed in that the message will remain in the queue until the destination is available and the message is forwarded.
Oracle’s Advanced Queuing (AQ) facility, first introduced with Oracle8 Enterprise Edition, provides a complete queuing environment by storing the queue in the Oracle relational database. Advanced queues are Oracle database tables that support queuing operations—in particular, enqueue to create messages and dequeue to consume them. These messages, which can either be unstructured (raw) or structured (as Oracle objects, which are described in Chapter 13), correspond to rows in a table. Messages are stored in normal queues for normal message handling or in exception queues if they cannot be retrieved for some reason.
Queue Creation and Management
Queues are created through PL/SQL commands or the Java API. Oracle9i introduces several new AQ capabilities:
XML-based messaging over HTTP enables support across firewalls; requests may be through the XML-based Internet Document Access Protocol (i DAP).
AQ policies and services can be ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.