这个日志是由第三方媒体管理软件生成的日志，此日志不包含 Oracle 数据库或 RMAN 错误，看起来清空后没有影响。

参考官方文档：Troubleshooting RMAN Operations

The sbtio.log contains information written by the media management software, not Oracle Database. Thus, you must consult your media vendor documentation to interpret the error codes and messages. If no information is written to the sbtio.log, then contact your media manager support to ask whether they are writing error messages in some other location, or whether there are steps you need to take to have the media manager errors appear in sbtio.log.