February 2004
Intermediate to advanced
848 pages
27h 25m
English
Content preview from WebLogic: The Definitive GuideBecome 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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Session Persistence
Session persistence involves persisting the data stored in the HTTP session object. This typically is done to support failover across a cluster of servers. For instance, if the session state is duplicated between two running servers, and if one goes down, the other server can take over and no data is lost. WebLogic supports five different mechanisms for persisting session state information:
- Memory (single-server, nonreplicated)
The session data is stored on a single server in memory.
- File
The session data is stored on a shared filesystem.
- JDBC
The session data is stored in a database table.
- Cookie-based
The session data is stored at the client end in a cookie.
- In-memory replication
The session data is stored in memory on multiple servers.
By default, WebLogic stores session state information in memory in a nonreplicated manner. The other four persistence mechanisms are desirable when the web application is deployed in a WebLogic cluster. Session persistence allows WebLogic Server to support automatic session failover. Session failover ensures that a server failure remains transparent to the user — another server will seamlessly pick up the backup of the session data. Because the session data is now persistent and accessible to multiple server instances, session information isn’t lost when the server goes down. Clearly, session persistence will be more expensive than just storing the session data in memory on a single server. The session caching mechanism can help ...
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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.