DBMS > EJDB vs. Microsoft SQL Server vs. XTDB
System Properties Comparison EJDB vs. Microsoft SQL Server vs. XTDB
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|Editorial information provided by DB-Engines|
|Name||EJDB Xexclude from comparison||Microsoft SQL Server Xexclude from comparison||XTDB formerly named Crux Xexclude from comparison|
|Description||Embeddable document-store database library with JSON representation of queries (in MongoDB style)||Microsofts flagship relational DBMS||A general purpose database with bitemporal SQL and Datalog and graph queries|
|Primary database model||Document store||Relational DBMS||Document store|
|Secondary database models||Document store|
|Current release||SQL Server 2019, November 2019||1.19, September 2021|
|License Commercial or Open Source||Open Source GPLv2||commercial restricted free version is available||Open Source MIT License|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Server operating systems||server-less||Linux|
|All OS with a Java 8 (and higher) VM|
|Typing predefined data types such as float or date||yes string, integer, double, bool, date, object_id||yes||yes, extensible-data-notation format|
|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.||yes||no|
|SQL Support of SQL||no||yes||limited SQL, making use of Apache Calcite|
|APIs and other access methods||in-process shared library||ADO.NET|
Tabular Data Stream (TDS)
|Supported programming languages||Actionscript|
|Server-side scripts Stored procedures||no||Transact SQL, .NET languages, R, Python and (with SQL Server 2019) Java||no|
|Partitioning methods Methods for storing different data on different nodes||none||tables can be distributed across several files (horizontal partitioning); sharding through federation||none|
|Replication methods Methods for redundantly storing data on multiple nodes||none||yes, but depending on the SQL-Server Edition||yes, each node contains all data|
|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|
|Foreign keys Referential integrity||no typically not needed, however similar functionality with collection joins possible||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 Read/Write Locking||yes||yes|
|Durability Support for making data persistent||yes||yes||yes, flexibel persistency by using storage technologies like Apache Kafka, RocksDB or LMDB|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||yes|
|User concepts Access control||no||fine grained access rights according to SQL-standard|
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|EJDB||Microsoft SQL Server||XTDB formerly named Crux|
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