The CDH6.2.1 metabase suddenly added some tables that I had never seen before. Can someone help me understand the reason behind it? thanks

[#1]

[#2]

Welcome to the community @smail. In order to help others who may want to assist here, can you provide some more information?  For example, if you made any changes to metabase (Upgrade, add a data source, etc).

[#3]

I haven't made any changes to the database, it's just that my server's disk failed about a dozen days ago. We replaced the new disk, and the data in the scm library was restored by us through backup

[#4]

I queried these tables, and the number of data entries is 0. I can be sure these tables were not created by anyone