X$表[4]

          x$kcrmt - [t]hread context                                           
          x$kcrmx - recovery conte[x]t                                         
        [f]ile read                                                            
          x$kcrfx - file read conte[x]t -  7.3 or higher                       
      reco[v]ery component                                                     
        [f]ile [h]eaders                                                       
          x$kcvfh - all file headers                                           
          x$kcvfhmrr - files with [m]edia [r]ecovery [r]equired                
          x$kcvfhonl - [onl]ine file headers                                   
      [k]ompatibility management - 7.1.1 or higher                             
        x$kckce - [c]ompatibility segment [e]ntries                            
        x$kckty - compatibility [ty]pes                                        
        x$kckfm - compatibility [f]or[m]ats ( index into x$kckce )             
    [d]ata layer                                                               
      sequence [n]umber component                                              
         x$kdnce - sequence [c]ache [e]ntries - 7.2 or lower