Explain the notation pc1::tt1 jdev 11.1.2

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  decide to move to optimization soon. Book says join faster that the subquery in this example because the analyses involved. The "cost" to the subquery appears lower than the cost for the join. So it is confusing to me - aka How should I be interpreting this.

  Plan of subquery:

  

  join plan

  

  as you can see that the plan for the subquery has less than a cost. Could someone explain these outputs as to which application is more effective. I need to start somewhere.

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  Book says join faster that the subquery in this example because the analyses involved. The "cost" to the subquery appears lower than the cost for the join. So it is confusing to me - aka How should I be interpreting this.

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  subquery plan:
  
  
  join plan
  
  
  as you can see the subquery plan has less of a cost. Could someone explain from these outputs as to which query is more efficient. I need to start from somewhere.
  

  Are you talking about line #1 in each of these plans?

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  I have two tables (names have been changed to protect the innocent):

  
  

  TABLE 1:

  
  

  The Null columns?    Type

  -------------------- -------- ----------------------------------------------
  

  Table1_Primary_Key NOT NULL NUMBER

  more than 10 columns
  

  
  

  TABLE2:

  
  

  The Null columns?    Type

  -------------------- -------- ----------------------------------------------
  

  Table2_Primary_Key NOT NULL NUMBER

  more than 8 columns
  

  
  

  Lines of table1 has 1097172

  
  

  Rows of table2 has 160960
  

  
  

  I am analysis request and get explain below:

  
  

  SELECT t1. Table1_Primary_Key

  --

  FROM TABLE1 t1,

  From TABLE2 T2

  --

  WHERE t1. Table1_Primary_Key = t1. Table1_Primary_Key

  AND t2. Table2_Primary_Key = 3432798

  /
  

  
  

  ------------------------------------------------------------------------------------------------

  | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |

  ------------------------------------------------------------------------------------------------

  |   0 | SELECT STATEMENT |                 |     1.    21.     5 (0) | 00:00:01 |

  |   1.  NESTED LOOPS |                 |     1.    21.     5 (0) | 00:00:01 |

  |   2.   TABLE ACCESS BY INDEX ROWID | TABLE2.     1.    12.     3 (0) | 00:00:01 |

  |*  3 |    INDEX UNIQUE SCAN | TABLE2_PK |     1.       |     2 (0) | 00:00:01 |

  |   4.   TABLE ACCESS BY INDEX ROWID | TABLE1.  1096K |  9634K |     2 (0) | 00:00:01 |

  |*  5 |    INDEX UNIQUE SCAN | TABLE1_PK |     1.       |     1 (0) | 00:00:01 |

  ------------------------------------------------------------------------------------------------

  
  

  As you can see it table2 is exactly 1 row and join table1 on a correspondence of single line.

  
  

  My question is this:

  
  

  Why the plan of the explain command seems (at least for me) to indicate that it looked like all the rows in TABLE1?

  
  

  Thank you

  
  

  Thomas
  

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