Oracle DBA artifact: PRM disaster recovery tool, schema-level data recovery. Oracle database PRM-–schema-level Oracle database data recovery function. PRM (Parnassus Data Recovery Manager) is an enterprise-level Oracle database disaster recovery tool. PRM can restore truncated/deleted tables without backup, or restore data that cannot be opened in Oracle database (Alter Database Open failed). PRM is a graphical enhanced tool for Oracle DUL, which has many functions that Oracle DUL does not have.