I always get the message "The database timed out running your query." during the tag search "ratio:9:16 mpixels:0.9216.." after page 42.
Posted under Bugs & Features
ratio: searches are known to be slow. Going many pages deep into the search results is also known to be slow. When you combine the two the search eventually becomes too slow for the site and times out.
To work around this you can try breaking up your search results into chunks like this:
That, or you can get a Gold account. Gold and Platinum accounts have higher timeout limits so you can do more complex searches.
I did get the error message once, but have since been unable to reproduce it. It's most likely because of your account level, you only have a limited amount of time searching the database (3 seconds) before it will time out. Each search using the qualifiers you specified, i.e. "ratio:9:16 mpixels:0.9216.." after page 42, took about 6 to 9 seconds to complete.