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
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System Crashes
The abrupt failure of the server machine running the database is the most common cause of unplanned downtime. The server may crash because of hardware problems, such as the failure of a power supply, or because of software problems, such as a process that begins to consume all the machine’s CPU resources. Even if the underlying server platform is fine, the Oracle instance itself can fail. Whatever the cause of the crash, the effect on Oracle is the same—the instance ceases to exist. Note that it’s the instance that crashes, not the database. As you will recall from Chapter 2, the Oracle instance runs on the server and provides access to the database, which is stored on disk. This means that even a system crash, by itself, will not imperil any data that’s already safely stored within the disk files used by the Oracle database.
The impact of the crash will depend on the activity in progress at the time of the crash. Any connected sessions will no longer have a server process to which to talk. All active queries and transactions will be abruptly terminated. The process of cleaning up the resulting mess is called instance recovery or crash recovery .
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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.
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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.