/etc/portage/modules

This file can be used to override the metadata cache implementation. In practice,  is the only variable that the user will want to override.

After changing the  setting, it may be necessary to transfer or regenerate metadata cache. Users of the rsync tree need to run emerge --metadata if they have enabled  in.

In order to regenerate metadata for repositories not distributing pre-generated metadata cache, run emerge --regen (see emerge).

When using something like the sqlite module and want to keep all metadata in that format alone (useful for querying), enable  in.