用于PolarDB的阿里云云数据库和阿里云日志服务之间的区别

1.适用于PolarDB的阿里云ApsaraDB：
ApsaraDB for PolarDB是与MySQL，PostgreSQL和Oracle兼容的云原生关系数据库。 ApsaraDB体系结构在单个群集中支持5000台物理机。它是为需要快速性能，高并发性和自动伸缩的关键业务数据库应用程序而设计的。

2.阿里云日志服务：
日志服务是一个完整的实时数据记录服务。它是由阿里巴巴集团开发的。它支持日志的收集，使用，运输，搜索和分析。适用于PolarDB的阿里云ApsaraDB和阿里云日志服务之间的区别：

S.NO.	Alibaba Cloud ApsaraDB for PolarDB	Alibaba Cloud Log Service
1.	It was developed by Alibaba in August 2013.	It was developed by AlibabaCloud Inc. in 2016.
2.	It is a cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle.	It is a complete real-time data logging service that supports collection, consumption, shipping, search, and analysis of logs.
3.	In Alibaba Cloud ApsaraDB for PolarDB there are hosted server operating systems.	In Alibaba Cloud Log Service also there are hosted server operating systems.
4.	The license of Alibaba Cloud ApsaraDB for PolarDB is commercial.	The license of Alibaba Cloud Log Service is also commercial.
5.	It supports XML Format.	It does not support XML Format.
6.	It supports the Server-side scripting.	It does not support the Server-side scripting.
7.	There is only one partitioning method – Sharding.	There is only one partitioning method – Sharding.
8.	It supports SQL query language.	It also supports SQL query language.
9.	It support replication methods.	It support 3 replicas.
10.	ApsaraDB for PolarDB also provides the concept of Referential Integrity. Hence, there are Foreign Keys.	Log Service does not provides the concept of Referential Integrity. Hence, no Foreign Keys.
11.	It supports in-memory capabilities.	It does not support in-memory capabilities.
12.	It does not offer any API for user-defined Map/Reduce methods.	It offers an ES-Hadoop Connector as a Map/Reduce method.
13.	It supports ACID properties.	It does not support ACID properties.