An example of extending the application events is to add new records into the database at the bootstrap time.

扩展应用事件的一个例子就是在启动时向数据库增加新的记录。

youdao

For example, a new business application requires that the length of a database field should be enlarged.

例如，一个新的业务应用程序要求增加一个数据库字段的长度。

youdao

At some point in the future, the DBA may want to create a new table for separation of application data, but this is strictly a logical and semantic requirement and is not required by the database.

以后的某个时候，DBA可能希望创建一个新的表来分隔应用程序数据，但这仅仅是一个逻辑和语义需求，不是数据库的要求。

youdao