LevelDB vs LMDB

LevelDB

LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values. (by google)

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LMDB

Read-only mirror of official repo on openldap.org. Issues and pull requests here are ignored. Use OpenLDAP ITS for issues. (by LMDB)

Database

Source Code

openldap.org

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LevelDB		LMDB
	Project
27	Mentions	2
35,130	Stars	2,446
0.7%	Growth	1.3%
0.0	Activity	4.9
9 days ago	Latest Commit	about 1 month ago
C++	Language	C
BSD 3-clause "New" or "Revised" License	License	-

The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

LevelDB

Posts with mentions or reviews of LevelDB. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-12-05.

Codebases to read
5 projects | /r/cpp | 5 Dec 2023

I'm partial to how cleanly written https://github.com/google/leveldb is. It is a reasonable size to fully read & grok in not too long.
Unpacking LSM-Trees: The Powerhouse Behind Modern Databases
1 project | dev.to | 2 Dec 2023

[4] leveldb/doc/impl.md at main · google/leveldb. GitHub. Retrieved October 21, 2023 from https://github.com/google/leveldb/blob/main/doc/impl.md
Bloom filter support to leveldb by Sanjay Ghemawat
1 project | news.ycombinator.com | 2 Aug 2023
SQLite performance tuning: concurrent reads, multiple GBs and 100k SELECTs/s
5 projects | news.ycombinator.com | 12 Apr 2023
The Witty Guide to Installing LevelDB on Ubuntu: HostRooster® Edition
1 project | /r/domainrooster | 28 Mar 2023

git clone https://github.com/google/leveldb.git
Is there a lightweight, stable and embedded database library?
7 projects | /r/golang | 19 Dec 2022

leveldb?
Ask HN: What's the best source code you've read?
46 projects | news.ycombinator.com | 10 Sep 2022
LevelDB VS ZoneTree - a user suggested alternative
2 projects | 22 Aug 2022
Is Mongo as popular in the job world as it is with tutorial makers?
1 project | /r/node | 29 Jun 2022
Open Source Databases in Go
52 projects | /r/golang | 8 Jun 2022

goleveldb - Implementation of the LevelDB key/value database in Go.

LMDB

Posts with mentions or reviews of LMDB. We have used some of these posts to build our list of alternatives and similar projects.

lmdb in chrooted environment
1 project | /r/openldap | 21 Apr 2021

I am running OpenBSD current and failed to get the toy/sample lmdb to run in a chrooted environment.
lmdb ENOENT in cgi apps
1 project | /r/openbsd | 21 Apr 2021

I wrote a simple C++ cgi app (lmdb.cgi) based on the learnbchs example except the pledge part to learn the lmdb toy/sample.

What are some alternatives?

When comparing LevelDB and LMDB you can also consider the following projects:

RocksDB - A library that provides an embeddable, persistent key-value store for fast storage.

MongoDB - The MongoDB Database

SQLite - Unofficial git mirror of SQLite sources (see link for build instructions)

Redis - Redis is an in-memory database that persists on disk. The data model is key-value, but many different kind of values are supported: Strings, Lists, Sets, Sorted Sets, Hashes, Streams, HyperLogLogs, Bitmaps.

libmdbx - One of the fastest embeddable key-value ACID database without WAL. libmdbx surpasses the legendary LMDB in terms of reliability, features and performance.

Sophia - Modern transactional key-value/row storage library.

CouchDB - Seamless multi-master syncing database with an intuitive HTTP/JSON API, designed for reliability

upscaledb - A very fast lightweight embedded database engine with a built-in query language.

Apache Cassandra - Mirror of Apache Cassandra

ClickHouse - ClickHouse® is a free analytics DBMS for big data