Search engine data base

All other search engines, except google, yahoo, and bing, have their own data base? Or they use the data derived from these 3 main search engines? Will some one elaborate this, please

 

Some other search engines do have their own crawlers and databases. However, meta search engines mine data from other sources.

 

Google have many date base i think 1 city deta base is 6.7 GB

 

Most main search engines has their own database to store all cache of each page.

 

As I know about it each search engine use its own database.

 

every search engine has their own database, like Cuil is a search engine and now microsoft are using this search engine in backhand.

 

Every search engine has their own data but other mini search engines get the data from these big search engines.

 

Every SE has their own database and servers. They are rivals and would not share anything of theirs with one another.

 

Some other search engines do have their own crawlers and databases