DBMS > IBM Db2 Event Store vs. MySQL vs. Postgres-XL
System Properties Comparison IBM Db2 Event Store vs. MySQL vs. Postgres-XL
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|Editorial information provided by DB-Engines|
|Name||IBM Db2 Event Store Xexclude from comparison||MySQL Xexclude from comparison||Postgres-XL Xexclude from comparison|
|Description||Distributed Event Store optimized for Internet of Things use cases||Widely used open source RDBMS||Based on PostgreSQL enhanced with MPP and write-scale-out cluster features|
|Primary database model||Event Store|
Time Series DBMS
|Relational DBMS Key/Value like access via memcached API||Relational DBMS|
|Secondary database models||Document store|
|Developer||IBM||Oracle since 2010, originally MySQL AB, then Sun|
|Initial release||2017||1995||2014 since 2012, originally named StormDB|
|Current release||2.0||8.0.33, April 2023||10 R1, October 2018|
|License Commercial or Open Source||commercial free developer edition available||Open Source GPL version 2. Commercial licenses with extended functionallity are available||Open Source Mozilla public license|
|Cloud-based only Only available as a cloud service||no||no||no|
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|Implementation language||C and C++||C and C++||C|
|Server operating systems||Linux Linux, macOS, Windows for the developer addition||FreeBSD|
|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||yes XML type, but no XML query functionality|
|SQL Support of SQL||yes through the embedded Spark runtime||yes with proprietary extensions||yes distributed, parallel query execution|
|APIs and other access methods||ADO.NET|
RESTful HTTP API
Proprietary native API
native C library
streaming API for large objects
|Supported programming languages||C|
|Server-side scripts Stored procedures||yes||yes proprietary syntax||user defined functions|
|Partitioning methods Methods for storing different data on different nodes||Sharding||horizontal partitioning, sharding with MySQL Cluster or MySQL Fabric||horizontal partitioning|
|Replication methods Methods for redundantly storing data on multiple nodes||Active-active shard replication||Multi-source replication|
|MapReduce Offers an API for user-defined Map/Reduce methods||no||no||no|
|Consistency concepts Methods to ensure consistency in a distributed system||Eventual Consistency||Immediate Consistency||Immediate Consistency|
|Foreign keys Referential integrity||no||yes not for MyISAM storage engine||yes|
|Transaction concepts Support to ensure data integrity after non-atomic manipulations of data||no||ACID not for MyISAM storage engine||ACID MVCC|
|Concurrency Support for concurrent manipulation of data||No - written data is immutable||yes table locks or row locks depending on storage engine||yes|
|Durability Support for making data persistent||Yes - Synchronous writes to local disk combined with replication and asynchronous writes in parquet format to permanent shared storage||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||fine grained access rights according to SQL-standard||Users with fine-grained authorization concept no user groups or roles||fine grained access rights according to SQL-standard|
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|IBM Db2 Event Store||MySQL||Postgres-XL|
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