It is noticed a huge growth on sys_tiny_url table after upgrading the instance to late Madrid or early Paris.
Check the growth of the table in BigData or via the table itself after upgrading to MP4b.
This problem is fixed in the next upcoming release. If you are able to upgrade, review the Fixed In section to determine the latest version with a permanent fix your instance can be upgraded to.
If a workaround is needed, open a case with SN Technical Support mentioning PRB1385423.