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DBMS > Cloudflare Workers KV vs. LevelDB vs. XTDB vs. YDB

System Properties Comparison Cloudflare Workers KV vs. LevelDB vs. XTDB vs. YDB

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Editorial information provided by DB-Engines
NameCloudflare Workers KV  Xexclude from comparisonLevelDB  Xexclude from comparisonXTDB infoformerly named Crux  Xexclude from comparisonYDB  Xexclude from comparison
DescriptionA global, low-latency, key-value store for applications on Cloudflare with exceptionally high read volumes and low-latency.Embeddable fast key-value storage library that provides an ordered mapping from string keys to string valuesA general purpose database with bitemporal SQL and Datalog and graph queriesA distributed fault-tolerant database service, with high availability, scalability, immediate consistency and ACID transactions and providing an Amazon DynamoDB compatible API
Primary database modelKey-value storeKey-value storeDocument storeDocument store
Relational DBMS
DB-Engines Ranking infomeasures the popularity of database management systemsranking trend
Trend Chart
Score0.29
Rank#283  Overall
#40  Key-value stores
Score2.33
Rank#111  Overall
#19  Key-value stores
Score0.13
Rank#330  Overall
#45  Document stores
Score0.39
Rank#269  Overall
#43  Document stores
#126  Relational DBMS
Websitewww.cloudflare.com/­developer-platform/­workers-kvgithub.com/­google/­leveldbgithub.com/­xtdb/­xtdb
www.xtdb.com
github.com/­ydb-platform/­ydb
ydb.tech
Technical documentationdevelopers.cloudflare.com/­kv/­apigithub.com/­google/­leveldb/­blob/­main/­doc/­index.mdwww.xtdb.com/­docsydb.tech/­en/­docs
DeveloperCloudflareGoogleJuxt Ltd.Yandex
Initial release2018201120192019
Current release1.23, February 20211.19, September 2021
License infoCommercial or Open SourcecommercialOpen Source infoBSDOpen Source infoMIT LicenseOpen Source infoApache 2.0; commercial license available
Cloud-based only infoOnly available as a cloud serviceyesnonono
DBaaS offerings (sponsored links) infoDatabase as a Service

Providers of DBaaS offerings, please contact us to be listed.
Implementation languageC++Clojure
Server operating systemshostedIllumos
Linux
OS X
Windows
All OS with a Java 8 (and higher) VM
Linux
Linux
Data schemeschema-freeschema-freeschema-freeFlexible Schema (defined schema, partial schema, schema free)
Typing infopredefined data types such as float or datenonoyes, extensible-data-notation formatyes
XML support infoSome form of processing data in XML format, e.g. support for XML data structures, and/or support for XPath, XQuery or XSLT.nononono
Secondary indexesnonoyesyes
SQL infoSupport of SQLnonolimited SQL, making use of Apache CalciteSQL-like query language (YQL)
APIs and other access methodsHTTP REST
Proprietary protocol
HTTP REST
JDBC
RESTful HTTP API (DynamoDB compatible)
Supported programming languagesC
C++
Dart
JavaScript
Kotlin
Python
Rust
Scala
C++
Go
Java info3rd party binding
JavaScript (Node.js) info3rd party binding
Python info3rd party binding
Clojure
Java
Go
Java
JavaScript (Node.js)
PHP
Python
Server-side scripts infoStored proceduresnononono
Triggersnonono
Partitioning methods infoMethods for storing different data on different nodesnonenoneSharding
Replication methods infoMethods for redundantly storing data on multiple nodesyesnoneyes, each node contains all dataActive-passive shard replication
MapReduce infoOffers an API for user-defined Map/Reduce methodsnononono
Consistency concepts infoMethods to ensure consistency in a distributed systemEventual ConsistencyImmediate ConsistencyImmediate Consistency
Foreign keys infoReferential integritynononono
Transaction concepts infoSupport to ensure data integrity after non-atomic manipulations of datanonoACIDACID
Concurrency infoSupport for concurrent manipulation of datayesyesyesyes
Durability infoSupport for making data persistentyesyes infowith automatic compression on writesyes, flexibel persistency by using storage technologies like Apache Kafka, RocksDB or LMDByes
In-memory capabilities infoIs there an option to define some or all structures to be held in-memory only.nono
User concepts infoAccess controlnoAccess rights defined for Yandex Cloud users

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More resources
Cloudflare Workers KVLevelDBXTDB infoformerly named CruxYDB
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