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error while writing to database

# eix-update
Reading Portage settings...
Building database (/var/cache/eix/portage.eix)...
Applying masks...
Calculating hash tables...
Writing database file /var/cache/eix/portage.eix...
error while writing to database

There are two possible problems:

1) a permission problem.

# chown -R portage:portage /var/cache/eix/

2) a disk space problem.
If your disk is full, you will have the same symptoms as above.
Check: the output of:

df -h /

and make sure that the partition is not full.