• Source: Distributed data store

A distributed data store is a computer network where information is stored on more than one node, often in a replicated fashion. It is usually specifically used to refer to either a distributed database where users store information on a number of nodes, or a computer network in which users store information on a number of peer network nodes.




Distributed databases


Distributed databases are usually non-relational databases that enable a quick access to data over a large number of nodes. Some distributed databases expose rich query abilities while others are limited to a key-value store semantics. Examples of limited distributed databases are Google's Bigtable, which is much more than a distributed file system or a peer-to-peer network, Amazon's Dynamo
and Microsoft Azure Storage.
As the ability of arbitrary querying is not as important as the availability, designers of distributed data stores have increased the latter at an expense of consistency. But the high-speed read/write access results in reduced consistency, as it is not possible to guarantee both consistency and availability on a partitioned network, as stated by the CAP theorem.




Peer network node data stores


In peer network data stores, the user can usually reciprocate and allow other users to use their computer as a storage node as well. Information may or may not be accessible to other users depending on the design of the network.
Most peer-to-peer networks do not have distributed data stores in that the user's data is only available when their node is on the network. However, this distinction is somewhat blurred in a system such as BitTorrent, where it is possible for the originating node to go offline but the content to continue to be served. Still, this is only the case for individual files requested by the redistributors, as contrasted with networks such as Freenet, Winny, Share and Perfect Dark where any node may be storing any part of the files on the network.
Distributed data stores typically use an error detection and correction technique.
Some distributed data stores (such as Parchive over NNTP) use forward error correction techniques to recover the original file when parts of that file are damaged or unavailable.
Others try again to download that file from a different mirror.




Examples






= Distributed non-relational databases

=




= Peer network node data stores

=
BitTorrent
Blockchain (database)
Chord project
Freenet
GNUnet
IPFS
Mnet
Napster
NNTP (the distributed data storage protocol used for Usenet news)
Unity, of the software Perfect Dark
Share
Siacoin
DeNet
Storage@home
Tahoe-LAFS
Winny
ZeroNet




See also


Cooperative storage cloud
Data store
Keyspace, the DDS schema
Distributed hash table
Distributed cache
Cyber Resilience




References

Kata Kunci Pencarian:

• VMDS
• ScyllaDB
• Penyimpanan awan
• Graph database
• Oracle Corporation
• WhatsApp
• Ceph (perangkat lunak)
• ARPANET
• Dell EMC
• Distributed data store
• Voldemort (distributed data store)
• Data store
• Tombstone (data store)
• Data storage
• Keyspace (distributed data store)
• Distributed database
• Key–value database
• List of file systems
• Cloud storage