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@title Managing Garbage Collection
@group config
Understanding and configuring garbage collection.
Overview
========
Phabricator generates various logs and caches during normal operation. Some of
these logs and caches are usually of very little use after some time has
passed, so they are deleted automatically (often after a month or two) in a
process called "garbage collection".
Garbage collection is performed automatically by the daemons. You can review
all of the installed garbage collectors by browsing to {nav Config > Garbage
Collectors}.
Configuring Retention Policies
==============================
You can reconfigure the data retention policies for most collectors.
The default retention polcies should be suitable for most installs. However,
you might want to **decrease** retention to reduce the amount of disk space
used by some high-volume log that you don't find particularly interesting, or
to adhere to an organizational data retention policy.
Alternatively, you might want to **increase** retention if you want to retain
some logs for a longer period of time, perhaps for auditing or analytic
purposes.
You can review the current retention policies in
{nav Config > Garbage Collectors}. To change a policy, use
`bin/garbage set-policy` to select a new policy:
```
phabricator/ $ ./bin/garbage set-policy --collector cache.markup --days 7
```
You can use `--days` to select how long data is retained for. You can also use
`--indefinite` to set an indefinite retention policy. This will stop the
garbage collector from cleaning up any data. Finally, you can use `--default`
to restore the default policy.
Your changes should be reflected in the web UI immediately, and will take
effect in the actual collector **the next time the daemons are restarted**.
Troubleshooting
===============
You can manually run a collector with `bin/garbage collect`.
```
phabricator/ $ ./bin/garbage collect --collector cache.general
```
By using the `--trace` flag, you can inspect the operation of the collector
in detail.
Next Steps
==========
Continue by:
- exploring other daemon topics with @{article:Managing Daemons with phd}.

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