December 2014
Beginner
584 pages
15h 13m
English
Content preview from eXist
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Chapter 15. System Administration
When you’re using eXist day-to-day and eventually deploying it into a production environment, there are several topics that are useful to understand, both for those in a developer role and even more so for those in a system administration or DevOps role. The topics covered in this chapter look at some of the tools provided by or used with eXist that aid in stable and performant operation.
Logging
eXist uses Apache log4j as its mechanism for logging information and issues. Log4j provides a logging hierarchy that is configurable without changing the eXist code. Understanding how log4j works and how to configure it can help you get the most out of your eXist logfiles. Log4j provides several levels of logging. When eXist wishes to log a message, it decides at which level to log the message, and your log4j configuration then decides how this message is handled. The levels that log4j provides and at which eXist logs various messages are displayed in Table 15-1, with the most fine-grained at the top.
Table 15-1. Log4j logging levels
| Level | Description |
| Trace | Used for tracing the execution of complex parts of the eXist code. It is very unlikely that you will need to receive log messages at this level, unless debugging a serious issue. |
| Debug | Similar to trace, but less fine-grained. Again, it is very unlikely that you will need to receive log messages at this level unless you are investigating an issue with eXist. |
| Info | Used for logging status information about eXist for ... |
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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.
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.