Pejone wrote:But as i now google use this db.
No, they don't. I don't know what they do
use, but you can be 100% certain that it's not SQLite. SQLite is not designed to handle huge databases (Google's database is many, many GB) or large numbers of simultaneous connections, both of which are essential to Google. Not to mention that it's typeless, which isn't a big deal for little databases (and makes a programmer's job a little easier sometimes), but can cause a huge performance hit on big databases (in most databases, the data structure for a particular column type is optimized for that data type, but in a typeless database such optimization is impossible).
Okay, I did a little searching (on Google :wink:) and found this article
that claims that Google built their database software from scratch. Which makes sense. The article says that it's a flat-file database, though, which surprises me. No idea how accurate the article is.
Erp. Now I found a number of articles that claim that Google uses MySQL for "some parts" of their site. I'm guessing, though, that they still use a homebrew database to store the actual "guts" of the search database.