Rownum and plan to see where Explain the terms > and <

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  How to understand the implementation of the plan in oracle I mean if I see two implementation plans for a single sql_id plans 2 How to determine the best execution plan? Links and answers are much appreciated. Thank you

  How to understand the implementation of the plan in oracle I mean if I see two implementation plans for a single sql_id plans 2 How to determine the best execution plan? Links and answers are much appreciated. Thank you

  After two execution plans that have the same sql_id, so we can see what you're talking about.

  See "Oracle Explain Explain Plan optimizer" by Maria Colgan of the Oracle optimizer group

  http://www.Oracle.com/technetwork/database/bi-Datawarehousing/TWP-explain-the-explain-plan-052011-393674.PDF

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• explain the plan and so on

  Hello world
  
  
  could someone please provide me with details of explained the plan and I would appreciate some related details explain plan, trace and tkprof
  
  Thank you
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  Hello

  PLAN of EXPLAINING is an Oracle utility that analyzes a statement and shows the expected execution plan. It may be different from the implementation plan real for a number of reasons.

  Extended SQL trace (10046 event) is a way to gather advanced diagnostic information. There are different levels, at levels 8 and 12 provide the greatest level of detail (you will be able to see the events of waiting and the bind variable values).

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• difference between the execution plan and explain the plan?

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• Question about cardinality (lines) to explain the plan

  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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  In the book of my opinion Jonathan Lewis cost base Oracle Fundamentals still contains the best explanation of the use of optimizer statistics - and Christian Antognini Oracle performance troubleshooting also provides a lot of valuable information about statistics and their gathering. Of course the documentation also explains the basics in detail: Managing optimizer statistics - 11 g Release 2 (11.2). And if you want to get a shorter summary, then you can always take a look at the Web of Tim Hall site: https://oracle-base.com/articles/misc/cost-based-optimizer-and-database-statistics.

• explain the research plan

  Hi all
  
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  Is that with plan or should I adjust more.
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  Thanks and rgds
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  Are the line estimates accurate?

  Given that all say 1 and dynamic sampling has been used, it is likely that you have no stats gathered for these objects?

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• Explain the explain plan

  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.

  Thank you!

  The BEST way to get help when you ask questions is:

  1 ask questions on SPECIFIC things

  2. tell us EXACTLY what term, value, etc. ask abaout

  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.

  OK - what BOOK are you talking about? There is not much interest to mention a book if you're not going to tell us which book it and provide a link to it and even a page number. This gives us the SCOPE of your question.

  This "cost for the subquery" are you talking about? Be specifc. It is in one of the plans that you posted? What plan? Whose cost is it? For example, you could say:

  I have a question for the foreground below. Why is the cost to the xx line lower than the cost of the second plan on line AA?

  This question refers CLEARLY to the info we're talking. The way in which you stating the question, we try to guess what plan and the lines you want to say.

  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?

  Please edit your post and tell us EXACTLY what you ask in the topic and refer to values and SPECIFIC lines. Also post a link to the book and a reference to a page number you got the information from.

  The optimizer generally chooses the REAL implementation with the lowest cost plan. It is not clear whether the plans that you have posted are ACTUAL spending plans that Oracle really determined and used or just explain plans.for what Oracle thought it might use.

  If the statistics are not up-to-date these plans do not yet reflect the reality of the data.

  And if the amount of data is a small number of blocks or other of these plans can run better than the other in reality.

  You can find this Oracle white paper "Explain the Plan explaining" useful

  http://www.Oracle.com/technetwork/database/bi-Datawarehousing/TWP-explain-the-explain-plan-052011-393674.PDF