April 1999
Intermediate to advanced
552 pages
15h 39m
English
Content preview from Oracle Distributed Systems
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,
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.
How Procedural Replication Works
Procedural replication executes your procedure call in the local database and queues a call to the procedure in all other master databases in the replication group, using whatever parameters you pass. This mechanism requires a “wrapper” procedure that calls the procedure that locally does the queueing. It also requires that the procedure be registered as a replicated object in all databases in the replication group.
As an example, suppose that we have a package procedure USER_ADMIN.CREATE_USER and a replicated wrapper package DEFER_USER_ADMIN. A call to the wrapper package results in the following chain of events:
Call to DEFER_USER_ADMIN.CREATE_USER('SCOTT', ‘TIGER').
DEFER_USER_ADMIN calls USER_ADMIN.CREATE_USER('SCOTT', ‘TIGER').
Procedure USER_ADMIN.CREATE_USER executes locally.
DEFER_USER_ADMIN builds a remote call to USER_ADMIN.CREATE_USER in other master databases in the same replication group. The remote call is placed in the deferred transaction queue.
Procedure USER_ADMIN.CREATE_USER executes at remote databases.
Figure 14.1 depicts these events.
Figure 14-1. How procedural replication works
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.