DBMS > Apache Druid vs. ClickHouse
System Properties Comparison Apache Druid vs. ClickHouse
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|Editorial information provided by DB-Engines|
|Name||Apache Druid Xexclude from comparison||ClickHouse Xexclude from comparison|
|Description||Open-source analytics data store designed for sub-second OLAP queries on high dimensionality and high cardinality data||Column-oriented Relational DBMS powering Yandex|
|Primary database model||Relational DBMS|
Time Series DBMS
|Secondary database models||Time Series DBMS|
|Developer||Apache Software Foundation and contributors||Clickhouse Inc.|
|Current release||26.0.0, May 2023||v18.104.22.1683-stable, April 2023|
|License Commercial or Open Source||Open Source Apache license v2||Open Source Apache 2.0|
|Cloud-based only Only available as a cloud service||no||no|
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|Server operating systems||Linux|
|Data scheme||yes schema-less columns are supported||yes|
|Typing predefined data types such as float or date||yes||yes|
|XML support Some form of processing data in XML format, e.g. support for XML data structures, and/or support for XPath, XQuery or XSLT.||no||no|
|Secondary indexes||yes||yes, when using the MergeTree engine|
|SQL Support of SQL||SQL for querying||Close to ANSI SQL|
|APIs and other access methods||JDBC|
RESTful HTTP/JSON API
|Supported programming languages||Clojure|
|C# 3rd party library|
Elixir 3rd party library
Go 3rd party library
Java 3rd party library
Kotlin 3rd party library
Nim 3rd party library
Perl 3rd party library
PHP 3rd party library
Python 3rd party library
R 3rd party library
Ruby 3rd party library
Scala 3rd party library
|Server-side scripts Stored procedures||no||no|
|Partitioning methods Methods for storing different data on different nodes||Sharding manual/auto, time-based|
|Replication methods Methods for redundantly storing data on multiple nodes||yes, via HDFS, S3 or other storage engines|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||no||no|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||no||no|
|Concurrency Support for concurrent manipulation of data||yes||yes|
|Durability Support for making data persistent||yes||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||no||yes|
|User concepts Access control||RBAC using LDAP or Druid internals for users and groups for read/write by datasource and system||Access rights for users and roles|
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