[Mediawiki-l] connect to wikis to the same database?

[Uwe Brauer]

Hello

I am running mediawiki 1.9.3 and would like to try more
recent version. 
Could I install the most recent version of mediawiki (and
leave the old in place) and connect both to the same
database or would this cause problems?

Say the old is installed in 
/var/wiki
and the new in 
/var/wiki-new

Thanks 

Uwe Brauer