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Breaded IT » Web Development » SilverStripe CMS pre V3.0 » HouseKeeping » Rebuild Database
They say:
Every page type also has a database table corresponding to it.
Every time we modify the database, we need to rebuild it.
We can do this by going to http://xxxxx/db/build?flush=1.
It may take a moment, so be patient. This add tables and fields needed by your site, and modifies any structures that have changed.