Question: what is the 2nd argument? [58759497] Situation: No nightly exports/datapumps we have nightly RMAN backups. There is a known Oracle Bug 11791664 with inconsistent metadata in ASSM segments with NO workarounds listed   The object is in a specific tablespace (REPORTING) separate from our main tablespaces DBMS_REPAIR.CHECK_OBJECT fails with the same error Exp fails with the same error create table as select from fails with same error I know I can restore the production database to a copy on another server but other than that what are my options here? Can I recover just the tablespace or will that regenerate the same problem once the tablespace is recovered? Any suggestions are much appreciated.   I have never seen this error, so everything below are just assumptions: In case the BUG only affects the write into the data file, but not it’s corresponding data in redo / archive, you have a chance you can export the data there. Please ask Oracle Support for details on this BUG. there is a tool called BBED to edit blocks in data files directly. I don’t know if it can handle your problem I’ve never done it. there are some DUL (Data UnLoader) [e.g.  http://www.parnassusdata.com/en/emergency-services ] tools available which export data directly from datafiles. maybe they can unload data even with broken ASSM data.   There are probably more ways to address this problem.