Are you running a clustered Metadata server? If so you may want to start it in noCluster mode an run a reorganization backup to physically remove any deleted objects.
About the Reorganize Repositories Backup Option
https://go.documentation.sas.com/doc/en/bicdc/9.4/bisag/p16vd44w7smqlsn1a4eygd88gm6f.htm#n0pgxrqfbt5...The size of a Metadata object isn't stored as an attribute of that object in Metadata, I'm not aware of a way to output the size of objects in the repository. Often, this is a function of the number of objects rather than an individual object's size.
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Greg Wootton | Principal Systems Technical Support Engineer