How can I recover my system datafile without any backup? I was converting locally to dictionary-managed tablespaces by executing the querry exec dbms_space_admin.tablespace_migrate_to_dictionary('ts1'); after some time when I started my db I got the following error: "ORA-04045: errors during recompilation/revalidation of LBACSYS.LBAC$LOGON ORA-06508: PL/SQL: could not find program unit being called ORA-06512: at line 2 ORA-06508: PL/SQL: could not find program unit being called ORA-06512: at line 2." Please help me to recover my db. The problem is I don't have any sort of backup.
You cannot recover the SYSTEM tablespace's datafile without a backup. This is why a good backup and recovery strategy needs to be implemented. Your only option at this point is to re-create the entire database, which means you will lose your valuable data.
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