![]() We invite representatives of system vendors to contact us for updating and extending the system information,Īnd for displaying vendor-provided information such as key customers, competitive advantages and market metrics. yes yes yes User concepts Access control fine grained access rights according to SQL-standard Users with fine-grained authorization concept no user groups or roles no More information provided by the system vendor Source-replica replication none 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 Foreign keys Referential integrity yes yes not for MyISAM storage engine yes Transaction concepts Support to ensure data integrity after non-atomic manipulations of data ACID ACID not for MyISAM storage engine ACID Concurrency Support for concurrent manipulation of data yes yes table locks or row locks depending on storage engine yes via file-system locks 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. ![]() NET languages, R, Python and (with SQL Server 2019) Java yes proprietary syntax no Triggers yes yes yes Partitioning methods Methods for storing different data on different nodes tables can be distributed across several files (horizontal partitioning) sharding through federation horizontal partitioning, sharding with MySQL Cluster or MySQL Fabric none Replication methods Methods for redundantly storing data on multiple nodes yes, but depending on the SQL-Server Edition Multi-source replication ![]() Tcl Server-side scripts Stored procedures Transact SQL. ODBC inofficial driver Supported programming languages C# Proprietary native API ADO.NET inofficial driver yes yes no Secondary indexes yes yes yes SQL Support of SQL yes yes with proprietary extensions yes SQL-92 is not fully supported APIs and other access methods ADO.NET support for XML data structures, and/or support for XPath, XQuery or XSLT. XML support Some form of processing data in XML format, e.g. Windows server-less Data scheme yes yes yes dynamic column types Typing predefined data types such as float or date yes yes yes not rigid because of 'dynamic typing' concept. Implementation language C++ C and C++ C Server operating systems Linux
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