1.甲骨文：
Oracle是一个关系管理系统。它由Oracle Corporation在1980年开发。它是第一个为网格计算而设计的数据库，它提供了最灵活，最具成本效益的方式来管理信息和应用程序。它运行一个主要平台，例如WINDOWS，UNIX，LINUX和MACOS。它将关系数据库中的数据由用户通过应用程序或称为SQL的查询语言访问。
2. PouchDB：
PouchDB是一个开源的NoSQL嵌入式数据库。它是在CouchDB之后设计的，CouchDB是为npm提供支持的NoSQL数据库。它是用JavaScript语言编写的。由于PouchDB驻留在浏览器内部，因此无需通过网络执行查询，因此它使其速度非常快。它在浏览器中使用IndexedDB和WebSQL在本地存储数据。
Oracle和PouchDB之间的区别：
| S.No. | ORACLE | POUCHDB |
|---|---|---|
| 1. | It is developed by Oracle Corporation in 1980. | It is developed by Apache Software Foundation in 2012. |
| 2. | It is written in C and C++. | It is written using Javascript language. |
| 3. | It is a commercial software. | It is an open-source software. |
| 4. | The Primary database model for Oracle is Relational DBMS. | The primary database model for PouchDB is Document Store. |
| 5. | Server operating systems for Oracle are Solaris, Linux, OS X, Windows. | Server operating systems for PouchDB are server-less, requires a JavaScript environment (browser, Node.js). |
| 6. | It uses Horizontal partitioning method for storing different data on different nodes. | It uses Sharding partitioning method for storing different data on different nodes. |
| 7. | Immediate Consistency method ensures consistency. | Eventual Consistency method ensures consistency in a distributed system. |
| 8. | ACID properties of transaction are used. | It does not provides ACID transactions. |
| 9. | The replication method that Oracle supports is Master Slave Replication, Master-master replication. | The replication method that PouchDB supports is Master Slave Replication, Master-master replication. |
| 10. | It provides fine grained access rights according to SQL-standard. | It provides access rights for users can be defined per database. |