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"The question is not if you are paranoid, it is if you are paranoid enough."

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Friday September 03, 2004

	DOM is a memory hog
	Permalink \| Comments [1] \| 2004-09-03 10:41

I've been lazy and used a javax.xml.parsers.DocumentBuilder to get a DOM (Document Object Model) of the audit trail, and it turns out to be a real memory hog. Loading 17991 audit records (XML file was 7.7 MB) results in a Java VM of 304 MB (where 194 MB is the resident size of the process).

Not good!

I have audit trails millions of audit records.

This means that I'll probably have to use a SAX parser to parse the audit file.

Comments:

Hmm, might be worth looking into JAXB if you're doing stuff where you wish you had an in-memory view of an xml document, but can't afford to buy more RAM. Not sure if it'll stretch to millions though... Perhaps you'll need SAX after all.

Posted by Tim Foster on September 03, 2004 at 10:58 AM PDT #

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