The 
                  		WRITETHRU option determines whether modifications to a file are written out to disk immediately or buffered internally, either by the
                  COBOL system or by the operating system, and flushed to disk at a later stage.
                  	 
 
            	 
            
               Syntax:
 
               		 
               		
                
                  		    
                  			 WRITETHRU 
                  			 = 
                  			  {  
                  				ON 
                  			  }  
                  			  {  
                  				OFF 
                  			  }  
                  		    
                  		
               
 
               	 
              
            	 
            
               Parameters:
 
               		 
               		
                
                  		  
                   
                     			  
                     				
                     - ON
                        				
                     
- Write out all modifications to disk immediately.
                        				
                     
- OFF
                        				
                     
- Flush modifications later.
                        				
                     
  
               	 
              
            	 
             
            	 
             
            
           
         
         
Comments:
You can obtain greater security, at the cost of significantly reduced performance, by setting this parameter to ON.