Pruning

The blockchain prunes seven eighths of prunable tx data.
This saves about two thirds of the blockchain size, while
keeping the node useful as a sync source for an eighth
of the blockchain.

No other data is currently pruned.

There are three ways to prune a blockchain:

- run monerod with --prune-blockchain
- run "prune_blockchain" in the monerod console
- run the monero-blockchain-prune utility

The first two will prune in place. Due to how LMDB works, this
will not reduce the blockchain size on disk. Instead, it will
mark parts of the file as free, so that future data will use
that free space, causing the file to not grow until free space
grows scarce.

The third way will create a second database, a pruned copy of
the original one. Since this is a new file, this one will be
smaller than the original one.

Once the database is pruned, it will stay pruned as it syncs.
That is, there is no need to use --prune-blockchain again, etc.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index 5a1c4b9ad..4952116ac 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -677,6 +677,8 @@ namespace cryptonote
     template<class t_ids_container, class t_tx_container, class t_missed_container>
     bool get_transactions_blobs(const t_ids_container& txs_ids, t_tx_container& txs, t_missed_container& missed_txs, bool pruned = false) const;
     template<class t_ids_container, class t_tx_container, class t_missed_container>
+    bool get_split_transactions_blobs(const t_ids_container& txs_ids, t_tx_container& txs, t_missed_container& missed_txs) const;
+    template<class t_ids_container, class t_tx_container, class t_missed_container>
     bool get_transactions(const t_ids_container& txs_ids, t_tx_container& txs, t_missed_container& missed_txs) const;
 
     //debug functions
@@ -956,6 +958,10 @@ namespace cryptonote
     bool is_within_compiled_block_hash_area(uint64_t height) const;
     bool is_within_compiled_block_hash_area() const { return is_within_compiled_block_hash_area(m_db->height()); }
     uint64_t prevalidate_block_hashes(uint64_t height, const std::vector<crypto::hash> &hashes);
+    uint32_t get_blockchain_pruning_seed() const { return m_db->get_blockchain_pruning_seed(); }
+    bool prune_blockchain(uint32_t pruning_seed = 0);
+    bool update_blockchain_pruning();
+    bool check_blockchain_pruning();
 
     void lock();
     void unlock();