Can a web site database (like Y!A) be on XML files only?

I am wondering, can a dynamic web site like Y!A or Facebook store all it's data on XML files only, without using expensive DB like SQL Server. What do you think? Why it can be done and why it doesn't a good idea after all?

It is technically possibly - but hideously inefficient. You'd end up replacing expensive database software with even more expensive CPUs and RAM.

There are plenty of good, free database packages out there. Postgresql and MySQL spring to mind.

Databases are more organized and less maintence. XML files can go on forever. It is possible, but there are more efficient ways.

For a large size site this would not work as the speed would suffer, causing regular time-outs on browsing. You really need a database for any dynamic content. The most common one on the web is mysql, which is free, and is normally used in conjunction with the Apache/php servers.

no, it would be very largely resource consuming

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