Помогите сформулировать правильное видение ситуации...

  SQL Statement from editor:
   
   
  SELECT     *
            FROM doc_config
           WHERE LEVEL > 1
      CONNECT BY PRIOR doc_config_id = owner_id
      START WITH doc_config_id = :i_doc_config_id
  ------------------------------------------------------------
    
  Statement Id=4   Type=INDEX
  Cost=0  TimeStamp=01-08-05::13::05:06
  
    SELECT STATEMENT  CHOOSE
    FILTER
           (9)  CONNECT BY WITH FILTERING
               (4)  NESTED LOOPS
                   (2)  UNIQUE INDEX UNIQUE SCAN M_TBDOC3.PK_DOC_CONFIG  [Not Analyzed]
                   (3)  TABLE ACCESS BY USER ROWID M_TBDOC3.DOC_CONFIG  [Not Analyzed] 
                        Tablespace: TST1
               (8)  NESTED LOOPS
                   (6)  BUFFER SORT
                       (5)  CONNECT BY PUMP
                   (7)  TABLE ACCESS FULL M_TBDOC3.DOC_CONFIG  [Not Analyzed] 
                        Tablespace: TST1

      CONNECT BY PRIOR doc_config_id = owner_id

CREATE UNIQUE INDEX pk_doc_config ON doc_config
  (
    doc_config_id                   ASC
  )
/