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I have been running full node without specifying the pruning settings in bitcoin.conf.
I was wondering if I need to re-download the entire blockchain if I restart my node after turning on pruning settings?
No, when turning on pruning for a node with a full copy of the blockchain, it simply discards the oldest part of the blockchain down to the specified limit of what's to be kept.
You only need to download from scratch, if you turn off pruning or when you need to rescan or resync.
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