1.德比：
Derby 是一个用Java实现的功能齐全的开源关系数据库管理系统 (RDBMS)，顾名思义，它是由 Apache Software Foundations 开发的。它基于Java、JDBC 和 SQL 标准。 Derby 易于安装、部署和使用。它要么嵌入到Java应用程序中，要么用作数据库服务器。
2. 口袋数据库：
PouchDB 是一个开源的 NoSQL 内联数据库。它是在 CouchDB 之后设计的，CouchDB 是一个支持 npm 的 NoSQL 数据库。它是用 JavaScript 语言编写的。由于 PouchDB 驻留在浏览器中，因此无需通过网络执行查询，因此速度非常快。它在浏览器中使用 IndexedDB 和 WebSQL 在本地存储数据。
Derby 和 Pouchdb 的区别：
| S.NO. | Derby | Pouchdb |
|---|---|---|
| 1 | It is developed by Apache Software Foundation in 1997. | It is developed by Apache Software Foundation in 2012. |
| 2 | It is written in Java language. | It is written using Javascript language. |
| 3 | The primary database model for Derby is Relational DBMS. | The primary database model for PouchDB is Document Store. |
| 4 | Server operating systems for Derby are Windows, macOs, Linux, Unix, BSD and z/OS. | PouchDB server operating systems are server-less, requires a JavaScript environment (browser, Node.js). |
| 5 | APIs and other access methods used by Derby is JDBC. | APIs and other access methods used by PouchDB is HTTP REST, JavaScript API. |
| 6 | It supports only Java programming language. | It supports only Javascript programming language. |
| 7 | It supports Master-Slave Replication methods. | It supports Master-master replication, Master-slave replication. |
| 8 | In Derby, partitioning cannot be done. | In PouchDB, partitioning can be done by Sharding. |
| 9 | It is a open source software framework. | It is a open source software framework. |
| 10 | It supports fine grained access rights according to SQL-standard. | It does not support access right. |