Not necessarily. Last I heard, MySQL ships with multiple config files, ie: small, medium and large. So by choosing one of those you're effectively tuning MySQL as well.
Hmm, wouldn't it be a good idea to provide something similar? I think an initdb could have an additional flag, like "--tune-for medium-oltp", or something similar (MBs of RAM dedicated for PgSQL and estimated number of concurrent users?). This should probably be accompanied with verbosly claiming: applying medium-olap profile: ** increasing work_mem from 123 to 456 and maybe some hints for further tuning, and a great advice that all these numbers are changeable from postgresql.conf This would probably hint newbies that they should consider modifying these files, and also help with strange setups where sysadmin is an enemy (and not a DBA; and wouldn't like to modify postgresql.conf much, but an additional option to initdb should go fine ;)). Regards, Dawid