Database schema locks - how to detect and/or prevent

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    2  dbms_output.enable(1000000);
    3  for do_loop in (select session_id, a.object_id, xidsqn, oracle_username, b.owner owner,
    4  b.object_name object_name, b.object_type object_type
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  Object Type : TABLE
  Sessions being blocked : 134
  
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  HTH
  Girish Sharma