Query Plan changes when a static value is assigned to an update

I have a table
SQL> create table test
  2  as
  3  select '001' col
  4    from dual
  5  connect by level <= 15000
  6  /

Table created.

SQL> exec dbms_stats.gather_table_stats('SYSADM','TEST',CASCADE=>TRUE)

PL/SQL procedure successfully completed.
Now, I want to update the table so that each 5000 lines to be incremented as the value pass
001.002... and so on.

I did it.
SQL> set autotrace traceonly explain
SQL> set timing on
SQL> update test t
  2     set col = (select to_char(trunc(rno/5000)+1,'fm009')
  3             from (select row_number() over(order by rowid) rno,
  4                               rowid
  5                     from test) t1
  6             where t.rowid = t1.rowid)
  7  /

15000 rows updated.

Elapsed: 00:03:49.06

Execution Plan
----------------------------------------------------------
   0      UPDATE STATEMENT Optimizer=ALL_ROWS (Cost=8 Card=15000 Bytes=60000)
   1    0   UPDATE OF 'TEST'
   2    1     TABLE ACCESS (FULL) OF 'TEST' (TABLE) (Cost=8 Card=15000 Bytes=60000)
   3    1     VIEW (Cost=55 Card=15000 Bytes=375000)
   4    3       WINDOW (SORT) (Cost=55 Card=15000 Bytes=60000)
   5    4         TABLE ACCESS (FULL) OF 'TEST' (TABLE) (Cost=8 Card=15000 Bytes=60000)

SQL> rollback
  2  /

Rollback complete.

Elapsed: 00:00:01.00
It works very well. But what I discovered is. When I change the update above. And replace the
TO_CHAR (trunc(RNO/5000) + 1, 'fm009') with a static value as '1' the query plan changes and
It runs very quickly.
SQL> update test t
  2     set col = (select '1'--to_char(trunc(rno/5000)+1,'fm009')
  3             from (select row_number() over(order by rowid) rno,
  4                               rowid
  5                     from test) t1
  6             where t.rowid = t1.rowid)
  7  /

15000 rows updated.

Elapsed: 00:00:00.01


Execution Plan
----------------------------------------------------------
   0      UPDATE STATEMENT Optimizer=ALL_ROWS (Cost=8 Card=15000 Bytes =60000)
   1    0   UPDATE OF 'TEST'
   2    1     TABLE ACCESS (FULL) OF 'TEST' (TABLE) (Cost=8 Card=15000 Bytes=60000)
   3    1     TABLE ACCESS (BY USER ROWID) OF 'TEST' (TABLE) (Cost=1 Card=1 Bytes=4)

SQL> rollback
  2  /

Rollback complete.

Elapsed: 00:00:01.00
Why is it so. Can someone explain?

Karthick_Arp wrote:
SQL > update of test t
2 set col = (select to_char (trunc(rno/5000) + 1, 'fm009'))
3 from (select row_number() over (order by rowid) rno,
4 rowid
5 test) t1
6 where t.rowid = t1.rowid)
7.

15000 lines to date.

Execution plan
----------------------------------------------------------
STATEMENT UPDATE 0 = ALL_ROWS optimizer (cost = card 8 = 15000 bytes = 60000)
1 0 UPDATE OF 'TEST '.
2 1 TABLE ACCESS (FULL) 'TEST' (TABLE) (cost = card 8 = 15000 bytes = 60000)
3 1 VIEW (cost = map 55 = 15000 bytes = 375000)
4 WINDOW 3 (TRI) (cost = map 55 = 15000 bytes = 60000)
5 4 TABLE ACCESS (FULL) 'TEST' (TABLE) (cost = card 8 = 15000 bytes = 60000)

SQL > update of test t
2 set col = (select '1' - to_char (trunc(rno/5000) + 1, 'fm009'))
3 from (select row_number() over (order by rowid) rno,
4 rowid
5 test) t1
6 where t.rowid = t1.rowid)
7.

15000 lines to date.

Execution plan
----------------------------------------------------------
STATEMENT UPDATE 0 = ALL_ROWS optimizer (cost = card 8 = 15000 bytes = 60000)
1 0 UPDATE OF 'TEST '.
2 1 TABLE ACCESS (FULL) 'TEST' (TABLE) (cost = card 8 = 15000 bytes = 60000)
3 1 ACCESS TABLE (BY USER ROWID) OF 'TEST' (TABLE) (cost = 1 card = 1 bytes = 4)

Why is it so. Can someone explain?

In addition to what Rob has already said, the answer to your question is: given that the optimizer is smart and recognizes that your WINDOW TYPE in your second query (aka NWR) is never accessible and therefore simply ignores this part of the application. It turns it to a simple statement like this:

update test t
   set col = (select '1'
           from (select rowid
                   from test) t1
           where t.rowid = t1.rowid);

who can simply access the TEST table for each row of rowid, while your first query should do recursively for each TEST line full table scan. Using a statistics AUTOTRACE, you should see a large difference in e/s logic for both statements.

Using DBMS_XPLAN. DISPLAY could reveal more details what happens, if you're already on 9i or later version (seems to be 9iR2).

Kind regards
Randolf

Oracle related blog stuff:
http://Oracle-Randolf.blogspot.com/

SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676 /.
http://sourceforge.NET/projects/SQLT-pp/

Tags: Database

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    'MY_TRANSACTION_TABLE3 '. "" NEW_OFFCR_CD "as 'LO %' order by

    'Officer_Code' asc nulls last

    Hash value of plan: 1213358407

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

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

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

    |   0 | SELECT STATEMENT |                       |       |       | 42146 (100) |          |

    |   1.  UNIQUE FATE |                       |   230.  5750 | 42145 (1) | 00:08:26 |

    |*  2 |   TABLE ACCESS FULL | MY_TRANSACTION_TABLE |  4283.   104K | 42144 (1) | 00:08:26 |

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

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

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

    2 filter (("MY_TRANSACTION_TABLE3". "NEW_OFFCR_CD" AS "% LO %' AND

    'MY_TRANSACTION_TABLE3 '. ' BASE_DT ' =: PQ1 AND.

    INTERNAL_FUNCTION ("MY_TRANSACTION_TABLE3". "M") AND "

    'MY_TRANSACTION_TABLE3 '. (("' NEW_OFFCR_CD ' IS NOT NULL))

    MY_TRANSACTION_TABLE has 1.3 million records. There is an index made up of 4 columns, first column is BASE_DT and none of the other columns is used here in the predicate.

    Questions-

    (1) the number the ROWS column in the plan, I guess it's number of selected records in the query (and not the records read by the query). Fix?

    (2) there is an index on this table from BASE_DT (but other 3 columns in the index are not used). Each base_dt will select approximately 1.3 M. 80000 records why the index is not used?

    (3) the column of time in the plan. Step 1 made by 08:26 minutes and not 2A crossed 08:26 minutes? or steps 1 and 2 together have 08:26 mins?

    Thanks in advance

    1 LINES - shows the no. of rows estimated by the optimizer for this operation. This estimate is made using the table and column statistics (+ a few formulas can be)

    2. with the help of the index is decided by the optimizer based on profit he would get him. Internally, the database comes up with a lot of plan and selects a plan and at low cost. She stated that in light of current statistics rather than index, scanning, beneficial full table scan - so index have not been used.

    3. it is worth cumulative - CBO estimated a total 08:26 minutes - similar to the cost. But this chronology may not be necessarily the actual execution time.

    Read this link: http://www.oracle.com/technetwork/database/bi-datawarehousing/twp-explain-the-explain-plan-052011-393674.pdf it has almost all the information about the execution plan.

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    Thank you

    Hello

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    Hope this will help :)

    Kind regards
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  • How can I stop height tab to change when I hover over them?

    I use Firefox 29. When I move my mouse over any tab, the height of all tabs climbs to about twice the height, they are when I do not hover over them. I do not like this behavior. I'd rather have the tabs remain the same height if I hover over them or not.

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    HI -.

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    Best regards

    I have a main Table and the corresponding Audit Table. I have a trigger. I created using the suggestion:http://www.runningoracle.com/product_info.php?products_id=211

    Why?

    You try to resolve what made you what are the PROBLEM that select as the solution?

    Now the problem that I am facing is that: if I run the same query (same value) update on the main table for n times (with the same data)... my audit table is updated with a new record every time.

    Yes - it is EXACTLY what you say that you wanted to do and EXACTLY what the code does in this article.

    He is not able to determine that the value is the same.

    I think you mean that the code does NOT check if the value is the same. You can certainly change the code to do this check. But I have a question to start with your need for such a solution.

    My goal is to load the audit table data if the value in a cell in the main table is really have changed.

    OK - then modify the code to check EACH COLUMN and compare its NEW value to the OLD value and insert only the table of audit if SOME (or columns you care specifically) have changed.

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    It depends on what you mean by 'change the line '. Of course to update a column with the SAME value does not change the resulting data value.

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  • Get statistics of query Plan

    Hello

    I sent a simple application on the server by default (on localhost) OEP in Eclipse. I can see the results in the console when the generator to send messages to the port 9200. Also, I can see that the application is RUNNING when I check the processing of the event viewer (http://localhost:9002 / wlevs /)

    However, on the page of query plan, the result of stat is always 0 for all operators... I take a look at all the documentation, but I could not solve the problem.

    See you soon,.

    Alireza

    For the review of the performance, query plan statistics news are disabled by default. To activate it, please add following in the server's config.xml file before starting the server.

    true

    Kind regards

    XiYing

  • error message Popup on change based on the value of selectlist

    Hello


    I am new to Oracle Apex. I have a selectlist in my page. I need popup, an error message when the value is changed according to the value of selectlist. For example, the selectlist can have "Approved", "Rejected", "Started", value "not started". When I changed the value "Rejected" if it is already "approved" a popup/inline error message should appear and say that we cannot change "Approved" to "rejected". Similarly, I need to have 5 these validations on the fly (when the selectlist is changed). Also when the condition is the error value will not change (in the previous example, the value will not change to 'Rejected'). Is there a way to do this?

    ~ Best regards,.

    Nadège

    Hi Jeevin,

    You can use jQuery or Javascript to manage validations customized to your selection list onchange.

    Something like

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  • I need to set my Adobe Acrobat by default when I open PDF files. I've updated my adobe reader software and it changed my settings to always open with the reader. I still want to open it with Adobe Acrobat DC

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    Hello

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    You could do the same thing in the control panel.

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  • Change the value in the table after update

    Hi all

    I want to update a certain column (column date) after update is made. I can do this using "before the update" trigger. But I'm getting a few problems of transaction when the trigger is written as before the update (error on the side of java, saying data has been modified outside of the transaction). So I was wondering if there is another way to do the same, if I change data after the update takes place. I searched the net and found "can not change the NEW values for this after the update trigger type". Someone knows how to do this?

    Thanks in advance!

    Why not use plsql as sybrand said.

    javacall procedure, switch to the folder

    procedure does 2 things
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    PLSQL is there for this kind of thing

  • What is the best query plan

    Hi all

    Please help me choose the query plan. You can tell me which is the best plan for the No. 1 query plan or no plan No 2
    Map 1:

    PLAN_TABLE_OUTPUT
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    Hash value of plan: 442504905

    -----------------------------------------------------------------------------------------------------
    | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
    -----------------------------------------------------------------------------------------------------
    | 0 | SELECT STATEMENT | 1. 325. 13222 (1) | 00:02:39 |
    | 1. SORT ORDER BY | 1. 325. 13222 (1) | 00:02:39 |
    | 2. UNIQUE HASH | 1. 325. 13221 (1) | 00:02:39 |
    | 3. NESTED LOOPS |
    | 4. NESTED LOOPS | 1. 325. 13220 (1) | 00:02:39 |
    | 5. NESTED LOOPS | 1. 224. 13217 (1) | 00:02:39 |

    PLAN_TABLE_OUTPUT
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    | 6. NESTED LOOPS | 1. 199. 13216 (1) | 00:02:39 |
    | 7. NESTED LOOPS | 1. 144. 13215 (1) | 00:02:39 |
    |* 8 | HASH JOIN | 1. 93. 13212 (1) | 00:02:39 |
    |* 9 | TABLE ACCESS FULL | REC_EPS | 787. 25184 | 742 (2) | 00:00:09 |
    | * 10 | TABLE ACCESS FULL | RECEIPTDETAIL | 1059K | 61 M | 12462 (1) | 00:02:30 |
    | * 11 | TABLE ACCESS BY INDEX ROWID | LOTXLOCXID | 1. 51. 3 (0) | 00:00:01 |
    | * 12 | INDEX RANGE SCAN | IDX_LLI_ISQ | 1 | | 2 (0) | 00:00:01 |
    | 13. TABLE ACCESS BY INDEX ROWID | CODELKUP | 1. 55. 1 (0) | 00:00:01 |
    | * 14 | INDEX UNIQUE SCAN | PK_SYS_C004623 | 1 | | 0 (0) | 00:00:01 |
    | 15. TABLE ACCESS BY INDEX ROWID | RECEPTION | 1. 25. 1 (0) | 00:00:01 |
    | * 16. INDEX UNIQUE SCAN | PK_SYS_C004755 | 1 | | 0 (0) | 00:00:01 |

    PLAN_TABLE_OUTPUT
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    | * 17. INDEX RANGE SCAN | PK_SYS_C004767 | 1 | | 2 (0) | 00:00:01 |
    | 18. TABLE ACCESS BY INDEX ROWID | SKU | 1. 101 | 3 (0) | 00:00:01 |
    -----------------------------------------------------------------------------------------------------

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

    8 - access("RECEIPTDETAIL".") RECEIPTKEY «= SYS_OP_C2C ("REC_EPS".» ASNKEY') AND
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    9 filter (SYS_OP_C2C ("REC_EPS". "ASNKEY") > = U '0' AND "
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    PLAN_TABLE_OUTPUT
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    10 - filter("RECEIPTDETAIL".") RECEIPTKEY' > = U "0" AND "RECEIPTDETAIL". "" RECEIPTKEY "< = U'ZZZZZ") "
    11 - filter("LOTXLOCXID".") LOC "= U 'STAGE')
    12 - access("RECEIPTDETAIL".") TOLD "=" LOTXLOCXID. " "" IDENTITY CARD "AND
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    filter ("RECEPTION". "RECEIPTKEY" > = U '0' AND 'RÉCEPTION' "." " RECEIPTKEY"< = U'ZZZZZ") "
    17 - access("RECEIPTDETAIL".") SKU "=" SKU ". ("' SKU ')

    41 selected lines.
    =================================================================

    Plan No. 2:

    PLAN_TABLE_OUTPUT
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    Hash value of plan: 1174712643

    ----------------------------------------------------------------------------------------------------------
    | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
    ----------------------------------------------------------------------------------------------------------
    | 0 | SELECT STATEMENT | 1. 325. 18382 (1) | 00:03:41 |
    | 1. SORT ORDER BY | 1. 325. 18382 (1) | 00:03:41 |
    | 2. UNIQUE HASH | 1. 325. 18381 (1) | 00:03:41 |
    |* 3 | HASH JOIN | 1. 325. 18380 (1) | 00:03:41 |
    | 4. NESTED LOOPS |
    | 5. NESTED LOOPS | 1. 293. 17637 (1) | 00:03:32 |

    PLAN_TABLE_OUTPUT
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    | 6. NESTED LOOPS | 1. 192. 17634 (1) | 00:03:32 |
    | 7. NESTED LOOPS | 1. 167. 17633 (1) | 00:03:32 |
    | 8. NESTED LOOPS | 2. 224. 17631 (1) | 00:03:32 |
    |* 9 | TABLE ACCESS BY INDEX ROWID | LOTXLOCXID | 2. 102. 3 (0) | 00:00:01 |
    | * 10 | INDEX RANGE SCAN | IDX_LOTXLOCXID_LOC | 2 | | 1 (0) | 00:00:01 |
    | * 11 | TABLE ACCESS BY INDEX ROWID | RECEIPTDETAIL | 1. 61. 8814 (1) | 00:01:46 |
    | * 12 | INDEX SCAN FULL | IDX_RD_QCREQ | 1 | | 8813 (1) | 00:01:46 |
    | 13. TABLE ACCESS BY INDEX ROWID | CODELKUP | 1. 55. 1 (0) | 00:00:01 |
    | * 14 | INDEX UNIQUE SCAN | PK_SYS_C004623 | 1 | | 0 (0) | 00:00:01 |
    | 15. TABLE ACCESS BY INDEX ROWID | RECEPTION | 1. 25. 1 (0) | 00:00:01 |
    | * 16. INDEX UNIQUE SCAN | PK_SYS_C004755 | 1 | | 0 (0) | 00:00:01 |

    PLAN_TABLE_OUTPUT
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    | * 17. INDEX RANGE SCAN | PK_SYS_C004767 | 1 | | 2 (0) | 00:00:01 |
    | 18. TABLE ACCESS BY INDEX ROWID | SKU | 1. 101 | 3 (0) | 00:00:01 |
    | * 19. TABLE ACCESS FULL | REC_EPS | 787. 25184 | 742 (2) | 00:00:09 |
    ----------------------------------------------------------------------------------------------------------

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

    3 - access("RECEIPTDETAIL".") RECEIPTKEY «= SYS_OP_C2C ("REC_EPS".» ASNKEY') AND
    'RECEIPTDETAIL '. "' SKU ' = SYS_OP_C2C ("REC_EPS". » « « « SKU »))
    9 - filter("LOTXLOCXID".") QTY' > 0)

    PLAN_TABLE_OUTPUT
    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    10 - access("LOTXLOCXID".") LOC "= U 'STAGE')
    11 - filter("RECEIPTDETAIL".") RECEIPTKEY' > = U "0" AND "RECEIPTDETAIL". "" RECEIPTKEY "< = U'ZZZZZ") "
    12 - access("RECEIPTDETAIL".") SKU "=" LOTXLOCXID. " "' SKU ' AND
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    14 - access ("LISTNAME"= U 'RECSTATUS' AND "CODELKUP"." "RECEIPTDETAIL"="CODE". ("' STATUS ')
    16 - access("RECEIPTDETAIL".") RECEIPTKEY "=" RECEPTION ". ("' RECEIPTKEY")
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    17 - access("RECEIPTDETAIL".") SKU "=" SKU ". ("' SKU ')
    19 - filter (SYS_OP_C2C ("REC_EPS". "ASNKEY") > = U '0' AND SYS_OP_C2C ("REC_EPS". " ASNKEY") < = U'ZZZZZ") "

    44 selected lines.

    Did you test them? You do not have us given information on why you want to use one over the other... For example, do you need to recover as soon as possible all lines or do you want the first rows as quickly as possible? Given that you did not formatting on your plans and we do not request or background, we can say nothing. Even for an experienced DBA/developer - it is not always possible to read a plan and determine which is the 'best' - test and then you can tell us.

  • How can I force an 'invisible' object to become "visible" when a numeric value is entered?

    So I try to force an 'invisible' subform to move to 'visible' when a numeric value greater than or equal to 22 entered in a numeric field.

    I can't get the following javascript code to work correctly with any event. I tried change, calculate, validate, events and a few more useless. The only event that sort of works with javascript code that I use is the validate event. When I enter the code in the validateevent, the invisible subform becomes visible when an amount equal to or greater than 22 is entered, but when AN amount is entered in this field, an error message appears that says "failed validation of NumericField4" and the user must click 'Ok' to get rid of the box pop up.

    if (this.rawValue < = 22) { }

    Approval23.Presence = 'hidden';

    }

    if (this.rawValue > = 23) { }

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    Here is a link to my .pdf: http://www.filedropper.com/salgovform

    The field of the object in the javascript code is called: NumericField4 (aka new Grade of employment)

    The subform that I want to become visible when a number greater than 22 entered NumericField4, is called Approval23.

    I founded the javascript code, I used information I have gathered from the following thread and associates .pdf...

    Thread:

    http://forums.Adobe.com/message/1982919

    PDF in thread with javascript code:

    http://forums.Adobe.com/servlet/JiveServlet/download/1981437-8059/Sample_SW.PDF

    I'm sure miss me just a little thing that throws everything off!

    Any help would be GREATLY appreciated.

    Hello

    The following work in the case of output of the digital field, where the language is set to JavaScript:

    if (this.rawValue <= 22) {
     Approval23.presence = "hidden";
}
else {
     Approval23.presence = "visible";
}

    Here is your form: https://acrobat.com/#d=3gRNt6WBY2bE0K7en4CnSA

    Hope that helps,

    Niall

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