LevelDB

wikipedia:LevelDB (2021) on-disk key-value database

• bitcoind: 2023-05-31T04:10:29Z Opening LevelDB in /your/datapath/datadir/blocks/index

Go implementation of LevelDB is not actively maintained.

Fatal: Failed to register the Ethereum service: gap

Related

• Pebble
• geth: Using LevelDB as the backing database
• geth removedb
• Libmdbx, Erigon

See also

• LevelDB
• LevelDB, .ldb
• Key-value databases: Berkeley DB, Redis, etcd, leveldb, RocksDB (MyRocks), Infinispan, Amazon DynamoDB, Apache Zookeeper, LevelDB, RocksDB, Pebble

https://geth.ethereum.org/docs/fundamentals/databases