1.甲骨文：
Oracle是一个关系数据库管理系统(RDBMS)。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。它可以在Windows，Unix，Linux和macOS等主要平台上运行。它是一个关系数据库，用户可以通过该数据库通过应用程序或称为SQL的查询语言来访问数据。
2. Firebase：
Firebase由Google在2012年开发。它是一个用于实时存储和同步数据的数据库。它是由Cloud托管的实时文档存储，并提供了从任何设备(网络，移动设备)访问数据的灵活性。 iOS，Android和JavaScript客户端共享一个实时数据库实例，并自动接收具有最新数据的更新。
Oracle和Firebase之间的区别：
| S.No. | ORACLE | FIREBASE |
|---|---|---|
| 1. | It was developed by Oracle Corporation in 1980. | It is developed by Google in 2012. |
| 2. | The primary database model for Oracle is Relational DBMS. | The primary database model for Firebase is Document Store. |
| 3. | The replication methods that Oracle supports are Master-Slave Replication, Master-Master Replication. | It does not support replication method. |
| 4. | Server operating systems for Oracle are Solaris, Linux, OS X, Windows. | Server operating systems for Firebase are hosted. |
| 5. | It is a commercial software. | It is a commercial software. |
| 6. | It uses Horizontal partitioning method for storing different data on different nodes. | It does not support Partitioning methods. |
| 7. | JDBC, ODBC, ODP.NET, OCI are the APIs and access methods used in Oracle. | Android, iOS, JavaScript API, RESTful HTTP API are used as APIs and other access methods. |
| 8. | Immediate Consistency method ensures consistency. | Eventual and Immediate Consistency methods ensures consistency in a distributed system. |
| 9. | It is more suitable for large-scale applications. | It is more suitable for small-scale applications. |
| 10. | It provides more security than Firebase. | It is not much secure. |