1，申请免费oci 数据库，支持23ai,19c

https://cloud.oracle.com/

oci 提供多种访问方式和控制台：

2,本地主机sqldeveloper配置

2.1 下载wallet(从自治数据库下载客户端身份证明 (Wallet))

2.2 sqldeveloper 配置连接

配置用户名和密码.

连接类型：Cloud Wallet

配置文件：选择下载的wallet.zip 

服务名：不同的名称对应不同的服务水平。

• Connection Name - Name for this cloud connection.
• Username - Database username. Use the default administrator database account (admin) that is provided as part of the service.
• Password - Admin user's password that you or your Autonomous Transaction Processing administrator specified when creating the service instance.
• Connection Type - Select Cloud Wallet.
• Configuration File - Click Browse, and select the Client Credentials zip file, downloaded from the Autonomous Transaction Processing service console by you, or given to you by your Autonomous Transaction Processing administrator.
• Service - In the drop-down menu, service selections are prepended with database names. Select the tpurgent, tp, high, medium, or low menu item for your database. These service levels map to the TPURGENT, TP, HIGH, MEDIUM and LOW consumer groups, which provide different levels of priority for your session.

• Click Test - Status: Success displays at the left-most bottom of the New/Select Database Connection dialog.

• Click Connect - An entry for the new connection appears under Connections.

3.测试数据库

至此免费的 oracle 数据库，连接成功了，可以开始相关测试。

4.数据库配置信息

参考文章：

Connecting ATP from SQL Developer
https://docs.oracle.com/cd/F25688_01/docker_atp_install_guides/oipa_database_setup_on_oracle_atp/Content/Docker_ATP%20Documents/OIPA%20Database%20Setup%20on%20Oracle%20ATP/Connecting%20ATP%20from%20SQL%20Developer.htm#:~:text=Connecting%20ATP%20from%20SQL%20Developer%20Follow%20the%20steps,Connection.%203.%20The%20New%2FSelect%20Database%20Connection%20dialog%20appears.