2020-03-23 12:59:14 +00:00
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---
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2021-10-02 08:26:42 +00:00
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summary: 'Feature that allows node operators to download and sync only 1/3 of the blockchain'
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2020-03-23 12:59:14 +00:00
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terms: ["pruning"]
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---
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2020-08-16 17:11:02 +00:00
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{% include disclaimer.html translated="no" translationOutdated="no" %}
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2021-10-02 08:26:42 +00:00
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'Pruning' allows node operators to save 2/3 of storage space while keeping
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the full transaction history. Pruning works by removing 7/8 of unnecessary
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ring signature data. The 1/8 remaining data will be available to the other
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nodes and will be used to sync with the network. Other pruned nodes will
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have a random 1/8 of the data, which they will also make available to the
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network. There are no privacy or security downsides when using a pruned
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node.
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2020-03-23 12:59:14 +00:00
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There are three ways to prune:
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2021-10-02 08:26:42 +00:00
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- *Synchronize a pruned node from scratch:* You will download and sync only
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1/3 of the full blockchain.
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- *Prune an existing node:* The already existing blockchain will be pruned,
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but this will not result in a smaller blockchain. Instead, it will mark
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parts of the file as free, so that future data will use that free space,
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causing the file to not grow until free space grows scarce.
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- *Create a new pruned blockchain from a full one:* A full blockchain that
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you already have will be used to create a new, pruned blockchain.
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2020-03-23 12:59:14 +00:00
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2021-10-02 08:26:42 +00:00
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Pruned nodes are very useful and preferable to @remote-nodes, but if
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possible, users should run a full node and opt for pruning only in case if
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necessary.
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2020-03-23 12:59:14 +00:00
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2021-10-02 08:26:42 +00:00
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The 'database pruning' feature [was
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added](https://github.com/monero-project/monero/pull/4843) on January
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2019. See the [blog post]({{ site.baseurl }}/2019/02/01/pruning.html) for
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more information.
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