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LevelDB vs. LMDB

LevelDB LMDB + Add column
Description Key/Value database Memory-Mapped, Copy-on-Write
Multi-user system No Yes
Memory minimum 0 B 64 kB
Operating system
Programming language
Website https:/​/​github.​com/​google/​leveldb symas.​com/​mdb
Database model
Query language
Transactions No Yes
Unicode Yes No
Referential integrity No No
Price rating ★★★★★ ★★★★★
Sharding No No
Replication No No
Map and reduce No No
Revision control No No
Atomicity Yes Yes
Consistency Yes Yes
Isolation No Yes
Durability (data storage) Yes Yes
Horizontal scalable No No
Software distribution
Full text search No No
Preference 42% votes 58% votes
Documentation level ★★☆☆☆ ★★★★★
Lines of code 15.5 k 7 k
TTL for entries No No
Conditional entry updates Yes No
Composite keys Yes No
Free to use Yes Yes
Active Yes Yes
Database Connection Pooling No ?
Compression Yes No
Real time analytics No Yes
Creation Date 2011 2009
Community Driven Good Good
Web interface No ?
Secondary Indexes No No
Graph support No No
Embeddable Yes Yes
Geospatial Indexes No No
Data storage
Native driver
Online backup No Yes
Data types
Partial Index No ?
Function Based Index No No
Log Yes ?
Implementation flexibility (40% global votes) (50% global votes)
Download https:/​/​code.​google.​com/​p…wnloads/​list gitorious.​org/​mdb
Backup functionality No Good
Query Cache Yes No
Ease of use ★★★★☆ ★★★★☆
In-Place Update Yes Yes
Free for commercial use Yes Yes
Sorts Yes Yes
Open Source Yes Yes
Maximum size 1 000 000 000 EB 9.2 EB
Perfomance ★★★★☆ ★★★★★
JSON Yes Yes
Ajax Yes ?
Batch Loading Yes Yes
Corruption Resistant No Yes
Free edition Yes ?
Does your mom understand it No ?
Integrity model ?
Release Date ? September 2011
Value size max. ? 4 GB
API ? Basic
Locking model ?
Replication mode ?
Read preferences ? No
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