The Bugzilla Guide - 2.20.1 Release
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# 5.4. Modifying Your Running System

Bugzilla optimizes database lookups by storing all relatively static information in the `versioncache` file, located in the `data/` subdirectory under your installation directory.

If you make a change to the structural data in your database (the versions table for example), or to the "constants" encoded in `defparams.pl`, you will need to remove the cached content from the data directory (by doing a rm data/versioncache), or your changes won't show up.

`versioncache` gets regenerated automatically whenever it's more than an hour old, so Bugzilla will eventually notice your changes by itself, but generally you want it to notice right away, so that you can test things.

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