What Plan to explain is better?

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  Hello

  It's confusing.

  This looks like a 2nd review SQL for Oracle 12 c.

  What is this new SQL Beta - 1z1 - 071 - 2 SQL - Oracle Database SQL 12 c

  Can someone explain.

  Roger

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• How to make a Plan to explain on PL - SQL?

  Hey guys, it's Xev, I'm back with a whole new positive attitude . I am very happy now that I got my cluster (11.2) 2-node RAC 11 GR 2 installed and working properly

  I'm doing a plan to explain some pl - sql, I wrote, but I'm having a hard time trying to figure out how to make it work.

  The catplan.sql has been performed and I a plan_table ready and waiting for me.

  Here's the full code as well as the two tables table that I use, just as I'm supposed to display.

  This is the first table

  and Yes, I only want a single folder in there...

  CREATE TABLE FILLER

  ("DATA_PACKED" VARCHAR2 (75 BYTE)

  )

  Insert in FILLING (DATA_PACKED) values ('KICKKKKKKKKK');

  commit;

  Then at the top on the list is the table of the HAMMER, I will insert all the data once the pl/sql program runs...

  This table is supposed to be empty...

  CREATE TABLE HAMMER

  ('H1' VARCHAR2 (100 BYTE),

  "H2" VARCHAR2 (100 BYTE)

  )

  and now, the CODE... Now, it is a very small version of my load of GR 11, 2 test scripts that I wrote, but I need to see execution plan behind this logic.

  I can even make a plan to explain on this code, or do I have to use something else?
  

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

  declare

  Table type is table of the varchar2 (30) index directory.

  Table Z_STUFF.

  Start

  Select * BULK COLLECT into Z_STUFF of filling;

  because me in 1... 100

  loop

  for zoo in 1... Z_STUFF. Count

  loop

  Insert into HAMMER (H1, H2)

  values (Z_STUFF (zoo), Z_STUFF (zoo));

  end loop;

  end loop;

  end;

  /

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

  All comments are welcome, I just need to see what makes this logic behind the scenes...

  Thank you

  Xev.

  A query plan refers to an SQL statement.  A PL/SQL block can have 0 or more SQL statements.  It is, therefore, unnecessary to speak to generate a query plan for a PL/SQL block.  Your PL/SQL block happens to contain two different SQL statements.  You might get two different query plans, one for each statement.  Given how trivial statements are, however, I'm not sure that query plans would give you a lot of information.

  What is the problem you're trying to solve?  If you try to set the PL/SQL, you probably want to look into various profilers of PL/SQL.  For example, the DBMS_PROFILER package or the package DBMS_HPROF.

  Justin

• plan_table is necessary so that a plan to explain?

  Hi, I noticed that a plan to explain to a query can be obtained by defining autotrace on. However, when I get a result of the autotrace, it shows no record in the plan_table table. I just want to check with others to ensure that it is clear that a plan_table table is not necessary to obtain a plan for a query to explain. I also noticed that when I hit the button explain plan in sql developer, there is no record in the plan_table table.

  arizona9952 wrote:
  Hi, I noticed that a plan to explain to a query can be obtained by defining autotrace on. However, when I get a result of the autotrace, it shows no record in the plan_table table. I just want to check with others to ensure that it is clear that a plan_table table is not necessary to obtain a plan for a query to explain. I also noticed that when I hit the button explain plan in sql developer, there is no record in the plan_table table.

  What is your version of sql developer? If it's 3.0 cancellations, then the developer sql lines after extraction of the plan for the display. If you must rely on the result Autotrace or Plan to explain tabs.

  Similar description below thread:
  Choose specific SQL Developer 2 plan_table +?

  Concerning
  Girish Sharma

• filter (NULL IS NOT NULL) plan to explain?

  Hi all
  
  Can someone please explain what this explain plan statement means? I see a (NULL IS NOT NULL) filter as first statement - could not understand why it came so Googling.
  
  My query is used:

  EXPLAIN PLAN FOR
  MERGE INTO summary_bysrccd
  USING
  (SELECT LAST_DAY(TRUNC(to_timestamp(os.requestdatetime, 'yyyymmddhh24:mi:ss.ff4'))) AS SUMMARY_DATE,
  os.acctnum,
  ol.sourcecode AS sourcecode,
  ol.sourcename AS sourcename,
  count(1) cnt_articleview
  FROM article_views os , master_sourcecode ol
  where os.sourcecode = ol.sourcecode
  AND os.acctnum IS NOT NULL
  AND ol.sourcecode IS NOT NULL
  AND os.requestdatetime IS NOT NULL
  AND UPPER(os.success_ind) = 'S'
       AND (
            ('INCR'  = 'FULL'
            AND  (get_date_timestamp(os.requestdatetime) BETWEEN TO_DATE('23-AUG-2011 00:00:00','DD-MON-YYYY HH24:MI:SS') AND TO_DATE('27-AUG-2011 23:59:59','DD-MON-YYYY HH24:MI:SS')
            AND   os.entry_CreatedDate BETWEEN TO_DATE('22-AUG-2011 00:00:00','DD-MON-YYYY HH24:MI:SS') AND TO_DATE('28-AUG-2011 00:00:00','DD-MON-YYYY HH24:MI:SS')
            ))
            OR ('INCR' = 'FULL'
            AND os.entry_createddate BETWEEN TO_DATE('23-AUG-2011 00:00:00','DD-MON-YYYY HH24:MI:SS') AND TO_DATE('27-AUG-2011 23:59:59','DD-MON-YYYY HH24:MI:SS') )
       )
  group by LAST_DAY(TRUNC(to_timestamp(os.requestdatetime, 'yyyymmddhh24:mi:ss.ff4'))),
  os.acctnum,ol.sourcecode,ol.sourcename) mrg_query
  ON (ods_av_summary_bysrccd.acctnum = mrg_query.acctnum AND
  ods_av_summary_bysrccd.summary_date=mrg_query.summary_date AND
  ods_av_summary_bysrccd.sourcecode=mrg_query.sourcecode)
  WHEN NOT MATCHED THEN
  INSERT (SUMMARY_date,ACCTNUM,SOURCECODE,SOURCENAME,CNT_ARTICLEVIEW,ENTRY_LASTUPDATEDDATE)
  VALUES(mrg_query.summary_date,mrg_query.acctnum,mrg_query.sourcecode,mrg_query.sourcename,
  mrg_query.cnt_articleview,sysdate)
  WHEN MATCHED THEN
  UPDATE SET ods_av_summary_bysrccd.cnt_articleview=
  CASE WHEN NVL('INCR','INCR') = 'FULL' THEN mrg_query.cnt_articleview
  ELSE ods_av_summary_bysrccd.cnt_articleview+mrg_query.cnt_articleview
  END,
  ods_av_summary_bysrccd.entry_lastupdateddate=sysdate;

  My Plan to explain:

  SQL> select * from table(dbms_xplan.display);
  
  PLAN_TABLE_OUTPUT
  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Plan hash value: 268591246
  
  -----------------------------------------------------------------------------------------------------------------------------------------------
  | Id  | Operation                                 | Name                      | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     | Pstart| Pstop |
  -----------------------------------------------------------------------------------------------------------------------------------------------
  |   0 | MERGE STATEMENT                           |                           |     1 |   456 |       |     3   (0)| 00:00:01 |       |       |
  |   1 |  MERGE                                    | ODS_AV_SUMMARY_BYSRCCD    |       |       |       |            |          |       |       |
  |   2 |   VIEW                                    |                           |       |       |       |            |          |       |       |
  |   3 |    NESTED LOOPS OUTER                     |                           |     1 |   417 |       |     3   (0)| 00:00:01 |       |       |
  |   4 |     VIEW                                  |                           |     1 |   360 |       |     5 (100)| 00:00:01 |       |       |
  |   5 |      SORT GROUP BY                        |                           |     1 |    73 |   595M|            |          |       |       |
  
  PLAN_TABLE_OUTPUT
  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  |*  6 |       FILTER                              |                           |       |       |       |            |          |       |       |
  |*  7 |        HASH JOIN                          |                           |  6975K|   485M|  3944K| 17594   (1)| 00:03:32 |       |       |
  |   8 |         TABLE ACCESS FULL                 | ODS_MASTER_SOURCECODE     | 84021 |  2953K|       |   273   (1)| 00:00:04 |       |       |
  |*  9 |         TABLE ACCESS BY GLOBAL INDEX ROWID| ODS_ARTICLE_VIEWS         |  7007K|   247M|       |   826   (0)| 00:00:10 |    33 |    33 |
  |* 10 |          INDEX FULL SCAN                  | IDX_AV_ACCTNUM            |    25M|       |       |    26   (0)| 00:00:01 |       |       |
  |  11 |     TABLE ACCESS BY GLOBAL INDEX ROWID    | ODS_AV_SUMMARY_BYSRCCD    |     1 |    57 |       |     3   (0)| 00:00:01 | ROWID | ROWID |
  |* 12 |      INDEX UNIQUE SCAN                    | ODS_AV_SUMMARY_BYSRCCD_PK |     1 |       |       |     2   (0)| 00:00:01 |       |       |
  -----------------------------------------------------------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
  PLAN_TABLE_OUTPUT
  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  
     6 - filter(NULL IS NOT NULL)
     7 - access("OS"."SOURCECODE"="OL"."SOURCECODE")
     9 - filter("OS"."REQUESTDATETIME" IS NOT NULL AND "OS"."ENTRY_CREATEDDATE">=TO_DATE(' 2011-08-23 00:00:00', 'syyyy-mm-dd
                hh24:mi:ss') AND "OS"."ENTRY_CREATEDDATE"<=TO_DATE(' 2011-08-27 23:59:59', 'syyyy-mm-dd hh24:mi:ss') AND UPPER("OS"."SUCCESS_IND")='S')
    10 - filter("OS"."ACCTNUM" IS NOT NULL)
    12 - access("ODS_AV_SUMMARY_BYSRCCD"."SUMMARY_DATE"(+)=INTERNAL_FUNCTION("MRG_QUERY"."SUMMARY_DATE") AND
                "ODS_AV_SUMMARY_BYSRCCD"."ACCTNUM"(+)="MRG_QUERY"."ACCTNUM" AND "ODS_AV_SUMMARY_BYSRCCD"."SOURCECODE"(+)="MRG_QUERY"."SOURCECODE")
  
  Note
  -----
  
  PLAN_TABLE_OUTPUT
  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
     - dynamic sampling used for this statement

  This filter appears usually when the CBO has found a conflict between your predicates WHERE clause and declarative constraints on the tables involved.

  For example, suppose that the EMP table had this constraint:

  CHECK(empno > 0)
  

  And you were to interrogate the EMP with this query:

  select *
  from emp
  where empno <  0
  

  You will find that the NULL value is NOT NULL filter in the execution plan.

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• How keep the formatting of a plan to explain in the forum.

  Hi all

  I would like to know how to keep the formatting of a plan to explain in the new forum. I used to use {} code in the old forum, but it no longer works. I used '-' in the new forum, but apparently not worked either.

  An example would be greatly appreciated!

  Thank you very much.

  You can try to use the font "Courier New" for the explain plan command part. That would make it readable.

  HTH,

  Joy

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