adminlog stores all the actions done in the adminpanel. You may empty that in admincp > stats & logs > control panel log > prune You may do the same with the Moderator Log and Scheduled Task Log.
searchindex and search are no longer needed in vB4
session is used to keep track of who is on your site at any particular time - it's your Currently Active Users and your Online Users. It's also a MEMORY table - it takes up no drive space, only memory. If you reboot the computer or mysql, it's zapped.
word table is gone in vb4 also.
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