April 1999
Intermediate to advanced
552 pages
15h 39m
English
Content preview from Oracle Distributed SystemsBecome 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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Prerequisites and Restrictions
Read-only snapshots do not require the advanced
replication facilities. You must, however, have the Procedural Option
installed (i.e., the catalog script
catproc.sqlmust have been run), and the scripts
dbmssnap.sqland prvtsnap.plbmust have been run. (Oracle runs these scripts
automatically when you install the Procedural Option by running
catproc.sql.) You also must set initialization
parameters and grant appropriate system privileges to accounts that
create snapshots.
Initialization Parameters
In order for snapshots to be capable ofrefreshing automatically, you must set the following initialization parameters:
- JOB_QUEUE_PROCESSES
This parameter should be set to at least 1. The default is 0.
- JOB_QUEUE_INTERVAL
This parameter should be set to a value that is less than or equal to your most frequent snapshot interval. The default is 60; the units are seconds.
System Privileges
The following system privileges are associated with snapshot administration:
- ALTER ANY SNAPSHOT
The grantee can change various properties of snapshots in any schema. You should reserve this privilege for DBA accounts; it is granted to the DBA role when the database is created.
- CREATE ANY SNAPSHOT
The grantee can create a snapshot in any schema. You should reserve this privilege for DBA accounts; it is granted to the roles DBA and IMP_FULL_DATABASE when the database is created.
- CREATE DATABASE LINK
The grantee can create and drop private database links. Technically, this privilege is not ...
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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.
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.