getting to know Berkeley DB

getting to know Berkeley DB came upon this link:

http://simonwillison.net/2003/Nov/26/discoveringBerkeleyDB/

and this comment:


My only complaint about BerkeleyDB is that it's a wee bit flaky when not used with transactions. Databases can become corrupted, processes can deadlock, etc. I've found problems even when using CDS mode. Only problem with wrapping everything in transactions is the performance hit. So, here's what we came up with as a compromise (we use the excellent BerkeleyDB.pm module from our Perl code): lock the entire database on write with a semaphore. The overhead is negligible in terms of speed, but it's done a remarkable job of keeping our indexes very clean!


lock the entire database on write with a semaphore
???
say again?

Update (a few hours later)
i'm beginning to understand what the comment author meant....my rdbms experiece will freak out with these new ideas in berkeley db...

rpmdb: PANIC: fatal region error detected; run recovery

i started playing with fedora linux and today got this error while unstalling a package...
rpmdb: PANIC: fatal region error detected; run recovery
or actually many of these msgs

so this one helped to quickly resolve this

http://www.redhat.com/archives/fedora-list/2006-October/msg03072.html


thanks!

wireless configuration: Incorrect MFC DLL version installed

several hours came and went banging my head against the wall after getting this error msg.
all started when i decided to finally uninstall vs 2003 and i guess it removed some dlls that i shouldn't have to...
i'm fairly pissed off right now so lets skip to the solution:
after deciding not reinstall windows because of this, at least i decided to put xp sp3, although i didn't really needed to...anyway this didn't help =/
after absurdly many hours of google search i came to this page - http://www.techsupportforum.com/microsoft-support/windows-xp-support/169616-incorrect-mfc-dll-version-installed-system.html
and this hint led me to open my services tab, kill the fukking 'tray service' and write this blog, quite sardonically if i may add...
damn software :)