Not including the filter in the Plan to explain - filter (NULL IS NOT NULL)

Similar Questions

• Unable to understand the Plan to explain

  Hi gurus

  I'm trying to understand some basics of explain plan and get a hard time, I was reading the book tuning performance and incapable of understanding explain plan for the following query:

  Example query

  EXPLAIN PLAN FOR

  SELECT *.

  WCP

  WHERE THERE IS NOT (SELECT 0

  OF THE Department

  WHERE dept.dname = 'SALES' AND dept.deptno = emp.deptno)

  AND NOT EXISTS (SELECT 0

  Bonus OF

  WHERE bonus.ename = emp.ename);

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

  Select * from table (dbms_xplan.display);

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

  Output

  Hash value of plan: 734347697

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

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

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

  |   0 | SELECT STATEMENT |       |     5.   290.     7 (15) | 00:00:01 |

  |*  1 |  HASH ANTI JOIN |       |     5.   290.     7 (15) | 00:00:01 |

  |*  2 |   HASH ANTI JOIN |       |     5.   255.     5 (20) | 00:00:01 |

  |   3.    TABLE ACCESS FULL | EMP |    14.   532.     2 (0) | 00:00:01 |

  |*  4 |    TABLE ACCESS FULL | DEPT |     1.    13.     2 (0) | 00:00:01 |

  |   5.   TABLE ACCESS FULL | BONUS |     1.     7.     2 (0) | 00:00:01 |

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

  Information of predicates (identified by the operation identity card):

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

  1 - access("BONUS".") ENAME "=" EMP ". ("' ENAME ')

  2 - access("DEPT".") DEPTNO "=" EMP ". ("' DEPTNO ')

  4 - filter("DEPT".") DNAME "= 'SALES')

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

  Grateful if someone help out me. Thank you

  In addition, I really appreciate if someone proposes a simple tutorial to explain plan. Thanks again

  Concerning

  Shu

  Hi Shuumail,

  Here is the tutorial http://allthingsoracle.com/execution-plans-part-1-finding-plans/

• Explain the interpretation of the Plan

  Hi friends!

  I ve an anomaly in time of response of two databases that are equal between the two when I run the same query.

  On the first DB, when I run the query it takes 20 seconds, but on the second DB, the same query at 02:40 minutes.

  This Don t of sense to me, because the first DB contains a lot of data as second DB...

  I ve got the plan to explain both, but I Don t know how to interpret.

  It's the first DB EP, which is the fastest to execute the query (20 "):

  ********************************************************************************************************************************************************************************************

  SELECT STATEMENT CHOOSECost: 4 K bytes: 934 K cardinality: 4 K

  ORDER of 17 SORTING BY cost: 4 K bytes: 934 K cardinality: 4 K

  FILTER 16

  13 LOOPS IMBRIQUEES SEMI cost: 4 K bytes: 934 K cardinality: 4 K

  TABLE 11 ACCESS BY INDEX ROWID IMO. IDDPAR cost: 4 K bytes: 892 K cardinality: 4 K

  BITMAP 10 ROWID CONVERSION

  9 BITMAP AND

  5 BITMAP OR

  2 BITMAP CONVERSION TO ROWID

  1 INDEX RANGE SCAN NON-UNIQUE IMO. IDDPARX10 Cost: 306

  CONVERSION OF BITMAP ROWID 4

  3 INDEX RANGE SCAN NON-UNIQUE IMO. IDDPARX10 Cost: 3

  CONVERSION OF BITMAP TO 8 ROWID

  7 SORT ORDER BY

  6 INDEX RANGE SCAN NON-UNIQUE IMO. IDDPARX3 Cost: 455

  12 INDEX UNIQUE SCAN UNIQUE IMO. PK_IDDPACX1 bytes: 670 K cardinality: 62 K

  TABLE 15 ACCESS BY INDEX ROWID IMO. IDDPARE cost: 1 bytes: cardinality 1: 16

  14 INDEX UNIQUE SCAN UNIQUE IMO. Cardinality of PK_IDDPAREX1: 1

  ********************************************************************************************************************************************************************************************

  And it's the second DB, for the same query of course EP (2'40 "):

  **********************************************************************************************************************************************************

  SELECT STATEMENT CHOOSECost: 6 K bytes: 886 K cardinality: 4 K

  7 FILTER

  4 LOOPS IMBRIQUEES SEMI cost: 6 K bytes: 886 K cardinality: 4 K

  TABLE 2 ACCESS BY INDEX ROWID IMO. IDDPAR cost: 6 K bytes: 850 K cardinality: 4 K

  1 INDEX RANGE SCAN NON-UNIQUE IMO. IDDPARX5 cost: 298 cardinality: 11 K

  UNIQUE 3 INDEX SCAN UNIQUE IMO. PK_IDDPACX1 bytes: 417KO cardinality: 43 K

  TABLE 6 ACCESS BY INDEX ROWID IMO. IDDPARE cost: 1 bytes: cardinality 1: 16

  5 INDEX UNIQUE SCAN UNIQUE IMO. Cardinality of PK_IDDPAREX1: 1

  **********************************************************************************************************************************************************

  As you can see, second EP is as simple, but its effectiveness is much poorer.

  I m intends to interpret my experience with Plans to explain, but it is virtually zero. The most obvious difference I found is the BITMAP CONVERSION OF LINES and CONVERSION of bitmap to LINES Kael'thas appear in the first EP.

  I searched ´ve documentation CONVERSION BITMAP and I ve include, more or less. But I Don t know what measures to take to optimizer are Oracle do the same conversion on the second EP.

  I Don t pretend that someone to teach me everything on explains Plans for interpretation, I m aware of the track of this.

  But would like advice on how I can solve this problem. Any suggestion will be welcome.

  Thanks in advance

  AlexTutor wrote:

  All databases are Enterprise Edition.

  And I ve already tried with advice like that of...

  Okay - so now that you have shown us the request, can you show us EXACTLY what the real "index_combine" referring to the fact that you used looked like and tell us if the execution plan has changed at all with this suspicion.

  Note: Oracle does not ignore the advice, so if your data structures are the same, and you have the right to hint, Oracle would HAVE to give you the plan you want. The only reason why he could not is if the presence of the indication caused Oracle to examine an alternative implementation plan which was (a) cheaper than suggested and (b) a plan which the index was illegal.

  Concerning

  Jonathan Lewis

• Explain the Plan in pl/sql

  Dear all.
  

   
  /*
  DBMS_XPLAN.DISPLAY_CURSOR(
     sql_id        IN  VARCHAR2  DEFAULT  NULL,
     child_number  IN  NUMBER    DEFAULT  NULL, 
     format        IN  VARCHAR2  DEFAULT  'TYPICAL');
  */
  
  
  SQL> SELECT * FROM table (
    2     DBMS_XPLAN.DISPLAY_CURSOR('b7jn4mf49n569'));
   
  PLAN_TABLE_OUTPUT
  --------------------------------------------------------------------------------
  SQL_ID  b7jn4mf49n569, child number 0
  -------------------------------------
  select o.name, u.name from obj$ o, type$ t, user$ u  where o.oid$ = t.tvoid and
  u.user#=o.owner# and  bitand(t.properties,8388608) = 8388608 and
  (sysdate-o.ctime) > 0.0007
  Plan hash value: 4266358741
  --------------------------------------------------------------------------------
  | Id  | Operation                     | Name    | Rows  | Bytes | Cost (%CPU)| T
  --------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT              |         |       |       |    94 (100)|
  |   1 |  NESTED LOOPS                 |         |     1 |    72 |    94   (2)| 0
  |   2 |   NESTED LOOPS                |         |     1 |    56 |    93   (2)| 0
  |*  3 |    TABLE ACCESS FULL          | OBJ$    |    71 |  2414 |    37   (3)| 0
  |*  4 |    TABLE ACCESS BY INDEX ROWID| TYPE$   |     1 |    22 |     1   (0)| 0
  |*  5 |     INDEX UNIQUE SCAN         | I_TYPE2 |     1 |       |     0   (0)|
  |   6 |   TABLE ACCESS CLUSTER        | USER$   |     1 |    16 |     1   (0)| 0
  |*  7 |    INDEX UNIQUE SCAN          | I_USER# |     1 |       |     0   (0)|
  --------------------------------------------------------------------------------
   
  PLAN_TABLE_OUTPUT
  --------------------------------------------------------------------------------
  Predicate Information (identified by operation id):
  ---------------------------------------------------
     3 - filter(("O"."OID$" IS NOT NULL AND SYSDATE@!-"O"."CTIME">.0007))
     4 - filter(BITAND("T"."PROPERTIES",8388608)=8388608)
     5 - access("O"."OID$"="T"."TVOID")
     7 - access("U"."USER#"="O"."OWNER#")
   
  29 rows selected
   
  SQL> 

  As you can see using DBMS_XPLAN. DISPLAY_CURSOR. I can view the plan to explain any query in SQL * MORE.
  But I want to write a PL/SQL function generating a plan to explain for any query and display of the plan to explain in a HTML page
  How can I do the same thing in pl/sql? I need your advice.
  
  Thanks in advance!

  Better use a loop FOR:

  BEGIN
   htp.htmlopen ();
   htp.headopen ();
   htp.title ('My First Page');
   htp.headclose ();
   htp.bodyopen ();
   htp.tableopen ();
  
   FOR rc IN (SELECT PLAN_TABLE_OUTPUT FROM TABLE (dbms_xplan.display()))
   LOOP
    htp.tablerowopen ();
    htp.tabledata (rc.plan_table_output);
    htp.tablerowclose ();
   END LOOP;
  
   htp.tableclose ();
   htp.bodyclose ();
  
   htp.htmlclose ();
  END;
  

• Reg: Explain the Plan-

  Hi Experts,
  
  I had a doubt about the Plan to explain it.
  
  Is there a relationship between the cost amount in the Plan to explain and the number of lines read by the query?
  In other words - if the number of lines read by the query increases, which will increase the cost also?
  
  Can someone please give me some advice on this?
  
  
  Thank you and best regards,
  Vanessa B.

  ranitB wrote:
  Hi Experts,

  I had a doubt about the Plan to explain it.

  Is there a relationship between the cost amount in the Plan to explain and the number of lines read by the query?
  In other words - if the number of lines read by the query increases, which will increase the cost also?

  Can someone please give me some advice on this?

  "The answer is 'not really' the cost is single block read disc of research time. But if the number of lines that are expected + coming in overall result are higher, the work expected by Oracle would be also higher. Thus, indirectly, the answer may be Yes. That said, the number of rows contained in the plan of the explain command (you should check the execution plan, explain plan is not the real plan) are the lines that the optimizer is expected to pick up and extracted from the number ofrows real may or may not match with her.

  Aman...

• Explain the plan of a function?

  Hi people;
  
  I am running Oracle 11 g 11.2.0.3.
  Is it possible to get the plan of "explaining" execution of a function?
  
  Thx for your knowledge, looks.

  Hello

  dbms_profiler is really simple, it does not really require a tutorial.

  dbms_profiler.start_profiler;
  
  dbms_profiler.stop_profiler;
  

  That's all. The only thing that can take you a bit is the display of the results
  tables of % plsql_. Google will give you many links to examples, for example this one:

  http://www.toadworld.com/knowledge/KnowledgeXpertforOracle/tabid/648/TopicId/PROF7/default.aspx

  Best regards
  Nikolai

• Generation to EXPLAIN the PLAN on a database that is open in READ ONLY mode

  Hello
  
  I use the Oracle 10.2.0.3 version.
  
  If my database is opened in READ ONLY mode, means that no insert/update/delete operations are allowed here.
  
  During the generation of the PLAN to EXPLAIN this, the PLAN_TABLE registrations for any SQL. But my database is opened in READ ONLY mode, means that no inserts can happen.
  
  So, how can I generate EXPLAIN PLAN for my SQL in this State?
  
  Thanks in advance.
  
  
  
  Best regards
  oratest

  oratest wrote:
  I use the Oracle 10.2.0.3 version.

  If my database is opened in READ ONLY mode, means that no insert/update/delete operations are allowed here.

  During the generation of the PLAN to EXPLAIN this, the PLAN_TABLE registrations for any SQL. But my database is opened in READ ONLY mode, means that no inserts can happen.

  So, how can I generate EXPLAIN PLAN for my SQL in this State?

  You can always do: 'explain the plan in some_table@remote_database' to avoid inclusion in the local database. Unfortunately 10g added an extraction of the sequence of the code "explain plan", and that's where the call fails if you have tried this distant approach on your version.

  Here's an idea that I have not tested. If you configure a link of data to your database from production to the database read-only, you could then do a "explain plan" in the database of production for the SQL statement by changing each object reference in the SQL statement to "object@readonlydatabase". In most cases this will allow the optimizer to recognize the statement as "entirely to distance" and get the optimizer on the readonly database to create the execution plan - which will be then written into the production database.

  Concerning
  Jonathan Lewis

• explain the plan using plan_hash_value and runtime

  Hello

  Please let me know the syntax to get the plan to explain using sql_id and plan_hash_value.

  Also let me know how to find out the same sql execution times in the previous months. I have the ID value of sql.

  Kind regards

  VN

  > Is it possible to check how long the sql finished in the previous months?

  Of AWR / StatsPack reports.

  Or use awrsqrpt.sql which can query the repository for a single SQL_ID AWR.

  However, you must have the AWR data kept for 4 months.  The default retention is 7 days.

  Hemant K Collette

• Explain the Plan of DBA_HIST_SQL_PLAN

  Hello

  I have the SQL_ID of a poor performing stmt of sql and I need to get the plan to explain the same DBA_HIST_SQL_PLAN.

  Please let me how can know I generate an explain plan of DBA_HIST_SQL_PLAN using sql_id.

  Kind regards

  VN

  That's fine - the service is available in this version.  (I asked because I thought that might be a function g 11 - but I just checked, and it's in 10 gr 2 as well).

  Concerning

  Jonathan Lewis

• Explain the Plan in SQL Developer vs SQLPlus

  Hello world
  
  I have a small question. Why a plan explain blocking in SQL Developer but return immediately in sqlplus?
  
  For example, in SQL developer, I write my statement and use the F6 command to bring up the plan to explain it and just, it hangs and crashes. It seems he's trying to produce a plan to explain, but it worked for hours now.
  
  When I log into SQL Plus, I do a

  SQL> explain plan for <query>:
  SQL> select * from table(dbms_xplan.display);

  The whole process takes less than a minute to get the plan of the explain command.
  
  Is there something fundamentally different running through SQL Developer?
  
  Thank you!
  
  -Joe

  Joe,

  F6 in SQL Developer runs an AutoTrace, which is currently running the SQL and also shows schedules and terms of the explain command. If you only want the plan of the explain command, use F10.

  Kind regards
  Bob

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• Hello, I'm willing to give up my bundle of photography (Photoshop + Lightroom) project. I tried to do if however the plan itself does not appear here, be as creative cloud storage and on that there do not cancel option when you manage the plan. Its defini

  
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