一个文件有多大以防止你使用DOM或SimpleXML并使用拉解析器？

Question

I am going to build a script and I will handle a really big XML file. My question is when you have to move to a pull parser instead of using DOM or SimpleXML?

When the xml file is loaded into memory, it will be loaded every time for each user that requests data from it, even simultaneously or a single time for a period ?

Should I follow the "chunk method" or to avoid it and use SAX/XMLreader ?

Thank you.

Answer 1

Tree-based representations of XML, such as DOM, generally use 5-to-10 times the source document size. So it becomes a pain above 200Mb or so (or less if you're trying to handle a high concurrency and throughput, of course).

If you want to avoid repeatedly loading the same document into memory, your application should maintain a cache.