DBMS > Apache Druid vs. Microsoft SQL Server vs. VelocityDB
System Properties Comparison Apache Druid vs. Microsoft SQL Server vs. VelocityDB
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|Editorial information provided by DB-Engines|
|Name||Apache Druid Xexclude from comparison||Microsoft SQL Server Xexclude from comparison||VelocityDB Xexclude from comparison|
|Description||Open-source analytics data store designed for sub-second OLAP queries on high dimensionality and high cardinality data||Microsofts flagship relational DBMS||A .NET Object Database that can be embedded/distributed and extended to a graph data model (VelocityGraph)|
|Primary database model||Relational DBMS|
Time Series DBMS
|Relational DBMS||Graph DBMS|
Object oriented DBMS
|Secondary database models||Document store|
|Developer||Apache Software Foundation and contributors||Microsoft||VelocityDB Inc|
|Current release||25.0.0, January 2023||SQL Server 2022, November 2022||7.x|
|License Commercial or Open Source||Open Source Apache license v2||commercial restricted free version is available||commercial|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Server operating systems||Linux|
|Any that supports .NET|
|Data scheme||yes schema-less columns are supported||yes||yes|
|Typing predefined data types such as float or date||yes||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||yes||no|
|SQL Support of SQL||SQL for querying||yes||no|
|APIs and other access methods||JDBC|
RESTful HTTP/JSON API
Tabular Data Stream (TDS)
|Supported programming languages||Clojure|
|Server-side scripts Stored procedures||no||Transact SQL, .NET languages, R, Python and (with SQL Server 2019) Java||no|
|Triggers||no||yes||Callbacks are triggered when data changes|
|Partitioning methods Methods for storing different data on different nodes||Sharding manual/auto, time-based||tables can be distributed across several files (horizontal partitioning); sharding through federation||Sharding|
|Replication methods Methods for redundantly storing data on multiple nodes||yes, via HDFS, S3 or other storage engines||yes, but depending on the SQL-Server Edition|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Immediate Consistency||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||no||yes||no|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||no||ACID||ACID|
|Concurrency Support for concurrent manipulation of data||yes||yes||yes|
|Durability Support for making data persistent||yes||yes||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||no||yes||yes|
|User concepts Access control||RBAC using LDAP or Druid internals for users and groups for read/write by datasource and system||fine grained access rights according to SQL-standard||Based on Windows Authentication|
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|Apache Druid||Microsoft SQL Server||VelocityDB|
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