PURPOSE:            
  This article discusses the internal error "ORA-600 [17112]", what 
  it means and possible actions. The information here is only applicable 
  to the versions listed and is provided only for guidance.ERROR:
  ORA-600 [17112][a][b][c][d][e]VERSIONS:  versions 7.3.X to 8.1.XDESCRIPTION:
  Oracle has detected that the magic number in a memory chunk header has 
  been overwritten.
  This is a heap (in memory) corruption and there is no underlying data 
  corruption.  The error may occur in the one of the process specific heaps 
  (the Call heap, PGA heap, or session heap) or in the shared heap (SGA). 
ARGUMENTS:            Arg [a] Pointer to chunk header FUNCTIONALITY:      
  HEAP MANAGEMENT IMPACT:               PROCESS FAILURE
  MEMORY CORRUPTION, POSSIBLE INSTANCE FAILURE.
  NON DATA CORRUPTIVE - No underlying data corruption. SUGGESTIONS:        
  This is likely to be an effect rather than the cause
  of the problem.  May be due to an Operating System (OS)
  memory overwrite.  Run diagnostics to check the physical
  memory on the machine and check the OS system logs.
  For repeatable occurrances, please submit the trace
  files and alert.log to Oracle Support Services for further analysis.