DBMS > Datomic vs. Microsoft SQL Server vs. SpaceTime
System Properties Comparison Datomic vs. Microsoft SQL Server vs. SpaceTime
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|Editorial information provided by DB-Engines|
|Name||Datomic Xexclude from comparison||Microsoft SQL Server Xexclude from comparison||SpaceTime Xexclude from comparison|
|Description||Datomic builds on immutable values, supports point-in-time queries and uses 3rd party systems for durability||Microsofts flagship relational DBMS||SpaceTime is a spatio-temporal DBMS with a focus on performance.|
|Primary database model||Relational DBMS||Relational DBMS||Spatial DBMS|
|Secondary database models||Document store|
|Current release||1.0.6362, January 2022||SQL Server 2022, November 2022|
|License Commercial or Open Source||commercial limited edition free||commercial restricted free version is available||commercial|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Implementation language||Java, Clojure||C++||C++|
|Server operating systems||All OS with a Java VM||Linux|
|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||no||yes||A subset of ANSI SQL is implemented|
|APIs and other access methods||RESTful HTTP API||ADO.NET|
Tabular Data Stream (TDS)
|RESTful HTTP API|
|Supported programming languages||Clojure|
|Server-side scripts Stored procedures||yes Transaction Functions||Transact SQL, .NET languages, R, Python and (with SQL Server 2019) Java||no|
|Triggers||By using transaction functions||yes||no|
|Partitioning methods Methods for storing different data on different nodes||none But extensive use of caching in the application peers||tables can be distributed across several files (horizontal partitioning); sharding through federation||Fixed-grid hypercubes|
|Replication methods Methods for redundantly storing data on multiple nodes||none But extensive use of caching in the application peers||yes, but depending on the SQL-Server Edition||Real-time block device replication (DRBD)|
|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||ACID||ACID||no|
|Concurrency Support for concurrent manipulation of data||yes||yes||yes|
|Durability Support for making data persistent||yes using external storage systems (e.g. Cassandra, DynamoDB, PostgreSQL, Couchbase and others)||yes||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||yes recommended only for testing and development||yes||no|
|User concepts Access control||no||fine grained access rights according to SQL-standard||yes|
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We invite representatives of vendors of related products to contact us for presenting information about their offerings here.
|Datomic||Microsoft SQL Server||SpaceTime|
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