Here's what I did to get zeitgeist to stop logging. The "Privacy" app under System Settings never seemed to work properly, and clearing the history still left all sorts of information in the log files.
First, remove zeitgeist. I did this with synaptic. Don't remove the related libs, however, as Unity needs them. Restart the system.
Then, kill the running zeitgeist processes:
sudo killall -9 zeitgeist-fts zeitgeist-datahub zeitgeist-daemonThen, remove the existing logs:
rm activity*You can use srm if you feel it is necessary. Restart the system.
Upon restart, Zeitgeist will recreate the log files, albeit they will be essentially empty. Now set them to read-only:
sudo chmod ugo-w act*
Restart once more.
Once I did all this, the dash did not populate with recently used files, and the zeitgeist logs remained static. YMMV!