DBMS > AlaSQL vs. Microsoft SQL Server vs. Postgres-XL
System Properties Comparison AlaSQL vs. Microsoft SQL Server vs. Postgres-XL
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|Editorial information provided by DB-Engines|
|Name||AlaSQL Xexclude from comparison||Microsoft SQL Server Xexclude from comparison||Postgres-XL Xexclude from comparison|
|Primary database model||Document store|
|Relational DBMS||Relational DBMS|
|Secondary database models||Document store|
|Developer||Andrey Gershun & Mathias R. Wulff||Microsoft|
|Initial release||2014||1989||2014 since 2012, originally named StormDB|
|Current release||SQL Server 2017, October 2017||10 R1, October 2018|
|License Commercial or Open Source||Open Source MIT-License||commercial restricted free version is available||Open Source Mozilla public license|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Typing predefined data types such as float or date||no||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||yes XML type, but no XML query functionality|
|SQL Support of SQL||Close to SQL99, but no user access control, stored procedures and host language bindings.||yes||yes distributed, parallel query execution|
Tabular Data Stream (TDS)
|native C library|
streaming API for large objects
|Server-side scripts Stored procedures||no||Transact SQL, .NET languages, R, Python and (with SQL Server 2019) Java||user defined functions|
|Partitioning methods Methods for storing different data on different nodes||none||tables can be distributed across several files (horizontal partitioning); sharding through federation||horizontal partitioning|
|Replication methods Methods for redundantly storing data on multiple nodes||none||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||none||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||yes||yes||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||yes only for local storage and DOM-storage||ACID||ACID MVCC|
|Concurrency Support for concurrent manipulation of data||yes||yes|
|Durability Support for making data persistent||yes by using IndexedDB, SQL.JS or proprietary FileStorage||yes||yes|
|In-memory capabilities Is there an option to define some or all structures to be held in-memory only.||yes||yes||no|
|User concepts Access control||no||fine grained access rights according to SQL-standard||fine grained access rights according to SQL-standard|
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|AlaSQL||Microsoft SQL Server||Postgres-XL|
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