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feature_matrix.yaml
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---
group: Persistent stores
features: [ persist ]
notes:
poor multiprocess performance: >
Sqlite/YAML/PStore are multiprocess safe, but the performance suffers badly
since the whole database file must be locked for writing. Use a key/value
server if you want multiprocess concurrency!
backends:
- adapter: Mongo
platforms: [ MRI, JRuby ]
gems: mongo
features: [ threadsafe, multiprocess, increment, create, expires, each_key, bulk_read, bulk_write ]
description: "[MongoDB](http://www.mongodb.org/) database"
- adapter: Redis
platforms: [ MRI, JRuby ]
gems: redis
features: [ threadsafe, multiprocess, increment, create, expires, each_key, bulk_read, bulk_write ]
description: "[Redis](http://redis.io/) database"
- adapter: ActiveRecord
platforms: [ MRI, JRuby ]
gems: activerecord
features: [ threadsafe, multiprocess, increment, create, each_key, bulk_read, bulk_write ]
description: "[ActiveRecord](https://rubygems.org/gems/activerecord) ORM"
- adapter: File
platforms: [ MRI, JRuby ]
features: [ threadsafe, multiprocess, increment, create, each_key ]
description: "File store"
- adapter: LMDB
platforms: [ MRI ]
gems: lmdb
features: [ threadsafe, multiprocess, increment, create, each_key, bulk_read, bulk_write ]
description: "[Symas Lightning Memory-Mapped Database (LMDB)](http://symas.com/lmdb)"
- adapter: Sequel
platforms: [ MRI, JRuby ]
gems: sequel
features: [ threadsafe, multiprocess, increment, create, each_key, bulk_read, bulk_write ]
description: "[Sequel](http://sequel.rubyforge.org/) ORM"
- adapter: TokyoTyrant
platforms: [ MRI, JRuby ]
gems: tokyotyrant or ruby-tokyotyrant
features: [ multiprocess, increment, create, bulk_read ]
description: "[TokyoTyrant](http://fallabs.com/tokyotyrant/) database"
- adapter: PStore
platforms: [ MRI ]
features: [ multiprocess, increment, create, each_key, bulk_read, bulk_write ]
description: "[PStore](http://ruby-doc.org/stdlib/libdoc/pstore/rdoc/PStore.html) store"
notes:
multiprocess: poor multiprocess performance
- adapter: YAML
platforms: [ MRI, JRuby ]
features: [ multiprocess, increment, create, each_key ]
description: "[YAML](http://www.ruby-doc.org/stdlib/libdoc/yaml/rdoc/YAML/Store.html) store"
notes:
multiprocess: poor multiprocess performance
- adapter: Sqlite
platforms: [ MRI ]
gems: sqlite3
features: [ multiprocess, increment, create, bulk_read, bulk_write, each_key ]
description: "[Sqlite3](http://sqlite.org/) database"
unknown: [ threadsafe ]
notes:
multiprocess: poor multiprocess performance
- adapter: Daybreak
platforms: [ MRI, JRuby ]
gems: daybreak
features: [ multiprocess, increment, create, each_key, bulk_write ]
description: "Incredibly fast pure-ruby key/value store [Daybreak](http://propublica.github.com/daybreak/)"
- adapter: DBM
platforms: [ MRI ]
features: [ increment, create, each_key, bulk_read, bulk_write ]
description: "[Berkeley DB using DBM interface or NDBM (Depends on Ruby environment)](http://www.ruby-doc.org/stdlib/libdoc/dbm/rdoc/DBM.html)"
- adapter: GDBM
platforms: [ MRI, JRuby ]
gems: ffi-gdbm on JRuby
features: [ increment, create, each_key, bulk_read, bulk_write ]
description: "[GDBM](http://www.ruby-doc.org/stdlib/libdoc/gdbm/rdoc/GDBM.html) database"
- adapter: LevelDB
platforms: [ MRI ]
gems: leveldb
features: [ increment, create, each_key, bulk_read, bulk_write ]
description: "[LevelDB](http://code.google.com/p/leveldb/) database"
- adapter: SDBM
platforms: [ MRI ]
features: [ increment, create, each_key, bulk_read, bulk_write ]
description: "[SDBM](http://www.ruby-doc.org/stdlib/libdoc/sdbm/rdoc/SDBM.html) database"
- adapter: TDB
platforms: [ MRI ]
gems: tdb
features: [ increment, create, each_key ]
description: "[TDB](http://tdb.samba.org/) database"
- adapter: KyotoCabinet
platforms: [ MRI ]
gems: kyotocabinet-ruby or kyotocabinet-ruby-reanimated
features: [ increment, create, each_key, bulk_read, bulk_write ]
description: "[KyotoCabinet](http://fallabs.com/kyotocabinet/) database"
- adapter: TokyoCabinet
platforms: [ MRI ]
gems: tokyocabinet
features: [ increment, create, each_key ]
description: "[TokyoCabinet](http://fallabs.com/tokyocabinet/) database"
- adapter: DataMapper
platforms: [ MRI ]
gems: dm-core, dm-migrations
features: [ threadsafe, multiprocess, create ]
description: "[DataMapper](http://datamapper.org/) ORM"
- adapter: Couch
platforms: [ MRI, JRuby ]
gems: faraday, multi_json
features: [ multiprocess, create, each_key, bulk_read, bulk_write ]
description: "[CouchDB](http://couchdb.apache.org/) database"
- adapter: HBase
platforms: [ Unstable ]
gems: hbaserb
features: [ multiprocess, increment ]
unknown: [threadsafe]
description: "[HBase](http://hbase.apache.org/) database"
- adapter: Cassandra
platforms: [ MRI, JRuby ]
gems: cassandra
features: [ multiprocess, expires, each_key, bulk_read, bulk_write ]
unknown: [threadsafe]
description: "[Cassandra](http://cassandra.apache.org/) distributed database"
- adapter: LocalMemCache
platforms: [ MRI ]
gems: localmemcache
features: [ threadsafe, multiprocess ]
description: "[LocalMemCache](http://localmemcache.rubyforge.org/) database"
- adapter: Fog
platforms: [ MRI, JRuby ]
gems: fog
features: [multiprocess]
unknown: [threadsafe]
description: "[Fog](http://fog.io/) cloud store"
- adapter: Riak
platforms: [ Unstable ]
gems: riak-client
features: [multiprocess]
description: "[Riak](http://docs.basho.com/) database"
---
group: Non-persistent stores
notes:
memcached protocol: >
There are some servers which use the memcached protocol but which are persistent
(e.g. [MemcacheDB](http://memcachedb.org/),
[Kai](http://sourceforge.net/apps/mediawiki/kai),
[IronCache](http://dev.iron.io/cache/reference/memcache/),
[Roma](https://github.com/roma/roma/tree),
[Flare](http://labs.gree.jp/Top/OpenSource/Flare-en.html) and
[Kumofs](https://github.com/etolabo/kumofs))
memcached backend: >
This feature is only available if the dalli backend is selected
in-memory multiprocess caveat: >
Store is multi-process safe because it is an in-memory store, values are not
shared between multiple processes
backends:
- adapter: MemcachedDalli
platforms: [ MRI, JRuby ]
gems: dalli
features: [ threadsafe, multiprocess, increment, create, expires, bulk_read, bulk_write ]
description: "[Memcached](http://memcached.org/) database with Dalli library"
notes:
persist: memcached protocol
- adapter: Memcached
platforms: [ MRI ]
gems: dalli or memcached
features: [ multiprocess, increment, create, expires ]
unknown: [ threadsafe, bulk_read, bulk_write, JRuby ]
description: "[Memcached](http://memcached.org/) database"
notes:
persist: memcached protocol
JRuby: memcached backend
threadsafe: memcached backend
bulk_read: memcached backend
bulk_write: memcached backend
- adapter: MemcachedNative
platforms: [ MRI ]
gems: memcached
features: [ multiprocess, increment, create, expires ]
description: "Memcached database with native library"
notes:
persist: memcached protocol
- adapter: Cookie
platforms: [ MRI, JRuby ]
features: [ multiprocess, increment, create, expires, each_key ]
description: "Cookie in memory store"
notes:
multiprocess: in-memory multiprocess caveat
- adapter: LRUHash
platforms: [ MRI, JRuby ]
features: [ multiprocess, increment, create, each_key ]
description: "LRU memory store"
notes:
multiprocess: in-memory multiprocess caveat
- adapter: Memory
platforms: [ MRI, JRuby ]
features: [ multiprocess, increment, create, each_key, bulk_read, bulk_write ]
description: Memory store
notes:
multiprocess: in-memory multiprocess caveat
- adapter: "Null"
platforms: [ MRI, JRuby ]
features: [ threadsafe, multiprocess ]
description: "No database"
---
group: Network clients
notes:
depends on server: Depends on server
backends:
- adapter: Client
platforms: [ MRI, JRuby ]
features: [multiprocess]
unknown: [ increment, create, expires, persist, each_key ]
description: "Moneta client adapter"
notes:
increment: depends on server
create: depends on server
expires: depends on server
persist: depends on server
each_key: depends on server
- adapter: RestClient
platforms: [ MRI, JRuby ]
features: [ multiprocess ]
unknown: [ persist ]
description: "Moneta REST client adapter"
notes:
persist: depends on server