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LMDB vs. LevelDB

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