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LevelDB is an open-source on-disk key-value store written by Google fellows Jeffrey Dean and Sanjay Ghemawat. [ 2 ] [ 3 ] Inspired by Bigtable , [ 4 ] LevelDB source code is hosted on GitHub under the New BSD License and has been ported to a variety of Unix -based systems, macOS , Windows , and Android .
LevelDB is an ordered key/value store created by Google as a lightweight implementation of the Bigtable storage design. As a library (which is the only way to use LevelDB), its native API is C++. It also includes official C wrappers for most functionality.
RocksDB, like LevelDB, stores keys and values in arbitrary byte arrays, and data is sorted byte-wise by key or by providing a custom comparator. RocksDB provides all of the features of LevelDB, plus: Transactions [16] Backups [17] and snapshots [18] Column families [19] Bloom filters [20] Time to live (TTL) support [21] Universal compaction [22]
RAID 01, also called RAID 0+1, is a RAID level using a mirror of stripes, achieving both replication and sharing of data between disks. [3] The usable capacity of a RAID 01 array is the same as in a RAID 1 array made of the same drives, in which one half of the drives is used to mirror the other half.
March 2013 Chain Fork (migration from BerkeleyDB to LevelDB caused a chain split) [15] CVE-2018-17144 (Bitcoin 0.15 allowed double spending certain inputs in the same block. Not exploited)
LevelDB: Key-value, Bigtable: Yes No No Partial Multiple writes can be combined into single operation No C++ Google New BSD License LightningDB: Key-value, memory-mapped files Yes No No Yes, ACID, MVCC No C Symas OpenLDAP Public License MongoDB: Document (JSON) Yes Yes fail-over Partial Single document atomicity [17] No C++ 10gen GNU AGPL v3.0 ...
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Tkrzw is a library of routines for managing key–value databases. Tokyo Cabinet was sponsored by the Japanese social networking site Mixi, and was a multithreaded embedded database manager and was announced by its authors as "a modern implementation of DBM". [1]