Query Tunning of Sql performance

Similar Questions

• How to tune my sql?

  Hello

  Could you please tell me how to tune my sql. I have to pay about 100 queries sql (sent by developers) to improve performance. All the links would be useful.

  Version: 10.2.0.1

  User: SYS

  Thank you.

  user_name => 'USER1',

  SY.

• upgrade 9i Sql performance problems, 10 g

  I've heard several times sql performance problem if db upgrade, what is his fix, this problem SQLs appear in ADDM report with Advisor tunning/access sql to run & its suggestions bugs?

  PL see MOS Doc 466181.1 (10 g companion Upgrade) - this topic is covered in this document

  HTH
  Srini

• You should know about optimizing SQL performance

  Hi gurus

  I want to know/learn some SQL performance settings, can you please guide me how to I achieve this? Thanks in advance

  Shuumail wrote:

  Can thanks for the reply, you offer me any specific book in your mentioned link?

  The subject itself is not my strong suite, but here are some observations:

  I recently bought the book of Kevin Meade. It is self-published and self published, is not as polished as a lot, but the content seems to be very good.  It establishes a methodical approach with a solid knowledge of the subject.

  Over the years, I've become less enamored of what whether by Burleson.  I was a little surprised to see that one of the books was written by him and Tim Hall.  I do not rely on the website of Mr. Hall for a bunch of stuff 'how to set up'.  On the other hand, if I see a google search show site of Burleson, I usually just pass.

  Whatever it is published by Oracle Press will probably be as solid than anything either, although not totally without error (no book is).  Rich Niemiec is unquestionably one of the top experts on the workings of the oracle, so I expect his book to be very authoritarian.

  I've never been disappointed in a book published by O'Reilly.  They are easy readings and so probably would make a good book "start here."

• SQL query (or pl / sql) show this week activities

  I need your friends to help to create the sql query (or pl / sql) show of this week's activities, my table is called activity and it has a date field (contains the date of the creation of the application)

  depends on what you describe as 'this week '...

  you could do something like

  WHERE your_date_field > = trunc(sysdate,'IW') AND your_date_field< trunc(sysdate="" +="">

  which would give you anything from Monday to Sunday from the current week

  HTH

• Need a tool to investigate SQL performance

  If anyone can share a tool to study the SQL performance?

  Hello

  I don't know if this is a good place but you can opt for Quest Toad, which is one of the most common SQL configuration tool.  However, if you are interesting in SQL performance specifically to your DB, then you can consider SQL tuning packs that come with DB Oracle enterprise edition (careful if you use the standard edition).

  In addition, Oracle has a very nice set of scripts allow you to download... but you must have an account to the Oracle support:

  SQL Tuning-health check Script (SQLHC) (Doc ID 1366133.1)

• SQL performance monitor

  Hello..
  
  I'm new to sql performance monitor and I need help...
  
  When I try to create a sql tuning set it asks for a schema to create the tuning series.
  
  1. what should I use for this?
  2. a particular schema will contain all the sql statements required by the database?
  3.i have multiple schemas in the database... do I do to get all the sql statements for the performance of the database?
  
  
  Thank you
  
  djgeo.

  Hello
  You can select a user database (no application) for the creation of sets of tunng sql

  Salman

• Rewrite the static query in dynamic SQL

  Can someone please help me write a dynamic query in pl/sql to SQL next?
  
  It's the game ('25', ' 04 "). the number of list might be n.
  The column_type varies from(1..6) and
  the from(1..6) of column_amt1 lines
  
  

   SELECT t.claim_no, t.cert_no, t.rec_code,
   (NVL(decode(t.column_type1,'25',NVL (t.column_amt1, 0)),0)+
      NVL(decode(t.column_type1,'04',NVL(t.column_amt1, 0)),0 )
    )  
    +
     (NVL(decode(t.column_type2,'25',NVL (t.column_amt2, 0)),0)+
      NVL(decode(t.column_type2,'04',NVL(t.column_amt2, 0)),0 )
     ) 
    +
     (NVL(decode(t.column_type3,'25',NVL (t.column_amt3, 0)),0)+
      NVL(decode(t.column_type3,'04',NVL(t.column_amt3, 0)),0 )
     ) 
    +
     (NVL(decode(t.column_type4,'25',NVL (t.column_amt4, 0)),0)+  
       NVL(decode(t.column_type4,'04',NVL(t.column_amt4, 0)),0 )
      ) 
    +
       (NVL(decode(t.column_type5,'25',NVL (t.column_amt5, 0)),0)+  
        NVL(decode(t.column_type5,'04',NVL(t.column_amt5, 0)),0 )
        ) 
    +
        (NVL(decode(t.column_type6,'25',NVL (t.column_amt6, 0)),0)+  
         NVL(decode(t.column_type6,'04',NVL(t.column_amt6, 0)),0 )) amt from test_detail t;
     

  Thanks in advance
  Hena

  But in fact, you should not dynamic SQL at all. What you could do is create a SQL type and use MEMBER OF:

  SQL> CREATE OR REPLACE
    2    TYPE test_detail_type_tbl
    3      AS
    4        TABLE OF varchar2(2)
    5  /
  
  Type created.
  
  SQL> select  case_id,
    2          item,
    3          code,
    4          case
    5            when type1 member of test_detail_type_tbl('25','04') then nvl(amt1,0)
    6            else 0
    7          end +
    8          case
    9            when type2 member of test_detail_type_tbl('25','04') then nvl(amt2,0)
   10            else 0
   11          end +
   12          case
   13            when type3 member of test_detail_type_tbl('25','04') then nvl(amt3,0)
   14            else 0
   15          end +
   16          case
   17            when type4 member of test_detail_type_tbl('25','04') then nvl(amt4,0)
   18            else 0
   19          end +
   20          case
   21            when type5 member of test_detail_type_tbl('25','04') then nvl(amt5,0)
   22            else 0
   23          end +
   24          case
   25            when type6 member of test_detail_type_tbl('25','04') then nvl(amt6,0)
   26            else 0
   27          end copay
   28    from  test_detail
   29  /
  
  CASE_ID    ITEM      CO      COPAY
  ---------- --------- -- ----------
  EML3371015 133761570 10        355
  EML3371015 133761570 10         20
  EML3371015 133761570 10          5
  EMC6369600 140328551 10         54
  EMH6353995 140328551 11      26.04
  
  SQL> select  case_id,
    2          item,
    3          code,
    4          case
    5            when type1 member of test_detail_type_tbl('25') then nvl(amt1,0)
    6            else 0
    7          end +
    8          case
    9            when type2 member of test_detail_type_tbl('25') then nvl(amt2,0)
   10            else 0
   11          end +
   12          case
   13            when type3 member of test_detail_type_tbl('25') then nvl(amt3,0)
   14            else 0
   15          end +
   16          case
   17            when type4 member of test_detail_type_tbl('25') then nvl(amt4,0)
   18            else 0
   19          end +
   20          case
   21            when type5 member of test_detail_type_tbl('25') then nvl(amt5,0)
   22            else 0
   23          end +
   24          case
   25            when type6 member of test_detail_type_tbl('25') then nvl(amt6,0)
   26            else 0
   27          end copay
   28    from  test_detail
   29  /
  
  CASE_ID    ITEM      CO      COPAY
  ---------- --------- -- ----------
  EML3371015 133761570 10        300
  EML3371015 133761570 10         20
  EML3371015 133761570 10          5
  EMC6369600 140328551 10          0
  EMH6353995 140328551 11       5.52
  
  SQL> 
  

  SY.

• Need a Suggestion tune the SQL query

  Hello
  
  
  There is a view that is created that takes 17 seconds to run the query, when I split the query and run each query prend.15 seconds to run. Below the query I need to improve the performance of the code if you need your suggestion please order to tweek so this time take for execution to become less
  
  SELECT "Parature'"Source. "
  NULL 'retailer ',.
  reseller_name "reseller."
  NULL city "reseller."
  NULL state "reseller."
  A.Country "dealer Country."
  DECODE (a.state, "ACPA", "ACPA", 'EMEA', 'EMEA', NULL, 'Unknown', 'US') "Dealer Theater",
  NULL "Customer Name,"
  NO city 'customer ',.
  'Client state', NULL
  NULL 'country of the customer. "
  NULL "customer Theater."
  NULL "sales book Date."
  NULL "Ship Date."
  c.sales_order_number 'Sales Order Number',
  C.Po_Number "Number"
  controller_model_number_1 "product name."
  TRIM (UPPER (serial_number_1)) 'product serial number.
  c.contract_id "Contract ID",
  product_name 'name of support. "
  To_date (c.contract_purchase_date) "Start Date"
  To_date (c.contract_expiration_date) 'Expiry Date',
  NULL "header Status."
  NULL "status of line."
  NULL 'line Type. "
  NULL "reason for termination of employment."
  NULL 'location_id. "
  NULL 'Product_id '.
  Of edb_assets c,.
  edb_accounts one
  WHERE controller_model_number_1! = 'NULL '.
  AND Serial_Number_1! = 'NULL '.
  AND C.Amid = A.Amid (+)
  
  UNION
  SELECT "Parature'"Source. "
  NULL 'retailer ',.
  reseller_name "reseller."
  NULL city "reseller."
  NULL state "reseller."
  A.Country "dealer Country."
  DECODE (a.state, "ACPA", "ACPA", 'EMEA', 'EMEA', NULL, 'Unknown', 'US') "Dealer Theater",
  NULL "Customer Name,"
  NO city 'customer ',.
  'Client state', NULL
  NULL 'country of the customer. "
  NULL "customer Theater."
  NULL "sales book Date."
  NULL "Ship Date."
  c.sales_order_number 'Sales Order Number',
  C.Po_Number "Number"
  controller_model_number_2 "product name."
  TRIM (UPPER (serial_number_2)) 'product serial number.
  c.contract_id "Contract ID",
  product_name 'name of support. "
  To_date (c.contract_purchase_date) "Start Date"
  To_date (c.contract_expiration_date) 'Expiry Date',
  NULL "header Status."
  NULL "status of line."
  NULL 'line Type. "
  NULL "reason for termination of employment."
  NULL 'location_id. "
  NULL 'Product_id '.
  Of edb_assets c,.
  edb_accounts one
  WHERE controller_model_number_2! = 'NULL '.
  AND serial_number_2! = 'NULL '.
  AND C.Amid = A.Amid (+)
  UNION
  
  SELECT "Parature'"Source. "
  NULL 'retailer ',.
  reseller_name "reseller."
  NULL city "reseller."
  NULL state "reseller."
  A.Country "dealer Country."
  DECODE (a.state, "ACPA", "ACPA", 'EMEA', 'EMEA', NULL, 'Unknown', 'US') "Dealer Theater",
  NULL "Customer Name,"
  NO city 'customer ',.
  'Client state', NULL
  NULL 'country of the customer. "
  NULL "customer Theater."
  NULL "sales book Date."
  NULL "Ship Date."
  c.sales_order_number 'Sales Order Number',
  C.Po_Number "Number"
  controller_model_number_3 "product name."
  TRIM (UPPER (serial_number_3)) 'product serial number.
  c.contract_id "Contract ID",
  product_name 'name of support. "
  To_date (c.contract_purchase_date) "Start Date"
  To_date (c.contract_expiration_date) 'Expiry Date',
  NULL "header Status."
  NULL "status of line."
  NULL 'line Type. "
  NULL "reason for termination of employment."
  NULL 'location_id. "
  NULL 'Product_id '.
  Of edb_assets c,.
  edb_accounts one
  WHERE controller_model_number_3! = 'NULL '.
  AND serial_number_3! = 'NULL '.
  AND C.Amid = A.Amid (+)
  
  UNION
  SELECT "Parature'"Source. "
  NULL 'retailer ',.
  reseller_name "reseller."
  NULL city "reseller."
  NULL state "reseller."
  A.Country "dealer Country."
  DECODE (a.state, "ACPA", "ACPA", 'EMEA', 'EMEA', NULL, 'Unknown', 'US') "Dealer Theater",
  NULL "Customer Name,"
  NO city 'customer ',.
  'Client state', NULL
  NULL 'country of the customer. "
  NULL "customer Theater."
  NULL "sales book Date."
  NULL "Ship Date."
  c.sales_order_number 'Sales Order Number',
  C.Po_Number "Number"
  controller_model_number_4 "product name."
  TRIM (UPPER (serial_number_4)) 'product serial number.
  c.contract_id "Contract ID",
  product_name 'name of support. "
  To_date (c.contract_purchase_date) "Start Date"
  To_date (c.contract_expiration_date) 'Expiry Date',
  NULL "header Status."
  NULL "status of line."
  NULL 'line Type. "
  NULL "reason for termination of employment."
  NULL 'location_id. "
  NULL 'Product_id '.
  Of edb_assets c,.
  edb_accounts one
  WHERE controller_model_number_4! = 'NULL '.
  AND serial_number_4! = 'NULL '.
  AND C.Amid = A.Amid (+)
  
  UNION
  SELECT "Parature'"Source. "
  NULL 'retailer ',.
  reseller_name "reseller."
  NULL city "reseller."
  NULL state "reseller."
  A.Country "dealer Country."
  DECODE (a.state, "ACPA", "ACPA", 'EMEA', 'EMEA', NULL, 'Unknown', 'US') "Dealer Theater",
  NULL "Customer Name,"
  NO city 'customer ',.
  'Client state', NULL
  NULL 'country of the customer. "
  NULL "customer Theater."
  NULL "sales book Date."
  NULL "Ship Date."
  c.sales_order_number 'Sales Order Number',
  C.Po_Number "Number"
  controller_model_number_5 "product name."
  TRIM (UPPER (serial_number_5)) 'product serial number.
  c.contract_id "Contract ID",
  product_name 'name of support. "
  To_date (c.contract_purchase_date) "Start Date"
  To_date (c.contract_expiration_date) 'Expiry Date',
  NULL "header Status."
  NULL "status of line."
  NULL 'line Type. "
  NULL "reason for termination of employment."
  NULL 'location_id. "
  NULL 'Product_id '.
  Of edb_assets c,.
  edb_accounts one
  WHERE controller_model_number_5! = 'NULL '.
  AND serial_number_5! = 'NULL '.
  AND C.Amid = A.Amid (+)
  UNION
  SELECT "Source", "ERP"
  Imv.Bill_To 'retailer ',.
  Imv.Ship_To "dealer."
  Ship_To_City "Dealer City."
  Ship_To_State "State dealer."
  Edb2_Global.Country_Name_Theater (Imv.Ship_To_Country, 'COUNTRY') 'dealer country. "
  Edb2_Global.Country_Name_Theater (Imv.Ship_To_Country, 'THÉÂTRE') 'dealer Theater. "
  Cl.Company_Name "name of the customer."
  Cl.City "customer's city."
  Cl.State "State of the customer."
  Edb2_Global.Country_Name_Theater (cl.) Country, 'COUNTRY') 'country of the customer. "
  Edb2_Global.Country_Name_Theater (cl.) Country, 'THEATER') "customer Theater."
  Imv.So_Booked_Date "Date from the sale of book."
  Imv.Ship_Date "Delivery Date"
  Imv.Order_Number "client order number."
  Imv.Cust_Po_Number "Number"
  Cp.Item_Name "product name."
  Cp.Product_Serial_Number "serial number of product."
  To_char (Imv.contract_number) "Contract ID"
  Imv.Service_Description "name of support."
  Imv.Service_Start_Date "Start Date"
  Imv.Service_End_Date "expiration Date."
  Imv.Header_Status "header Status."
  Imv.Line_Status "status of line."
  Imv.Line_Type 'line Type. "
  Imv.Termination_Reason "reason for termination of employment."
  Cl.Location_Id 'location_id. "
  CP.ID "Product_id".
  Of ib_support_contracts_mv imv.
  customer_products cp,
  customer_locations cl
  WHERE superior (Trim (Imv.Serial_Number)) = Upper (Trim (Cp.Product_Serial_Number (+)))
  AND Cp.Location_Id = Cl.Location_Id (+)
  /
  
  
  There is a Union for each request, please suggest how tweek
  
  Thank you
  Sudhir

  A quick look indicates that first 5 select queries are that even accepting the 2 conditions

  WHERE controller_model_number_1! = 'NULL '.
  AND Serial_Number_1! = 'NULL '.

  Use SEPARATE and Clause OR reduce these 5 queries in one like that

  SELECT DISTINCT
             .....
             ......  
  
    FROM edb_assets       c
        ,edb_accounts     a
  WHERE  C.Amid = A.Amid(+)
    AND  (
            (     controller_model_number_1 != 'NULL'
              AND Serial_Number_1 != 'NULL'
            )
           OR
            (     controller_model_number_2 != 'NULL'
              AND Serial_Number_2 != 'NULL'
            )
           OR
            (     controller_model_number_3 != 'NULL'
              AND Serial_Number_3 != 'NULL'
            )
           OR
            (     controller_model_number_4 != 'NULL'
              AND Serial_Number_4 != 'NULL'
            )
           OR
            (     controller_model_number_5 != 'NULL'
              AND Serial_Number_5 != 'NULL'
            )
  
         )
  

  Concerning
  Arun

  Published by: Arun Kumar Gupta on May 9, 2012 12:10

• Variable performance on a recursive query/view/CTE SQL - server 2008 R2

  I ask for help on the following problem.

  We use a view with a recursive select in it (see below). On a specific server (Server A) the performance of this view varies a lot. Respons times differ between 100 ms and 30 seconds or even more. We tested the same point of view on a backup of the database on another server (Server B) which results in a stable and good performance. A backup of the database that is installed on a server with no other interaction even results in variable performance. We compared the settings of operating system and the database on server A and Server B. There is no difference.

  We need additional input to resolve this problem. So please help!

  Concerning

  Announcement

  Create view [dbo]. [vwMarketSegmentsAll] as

  WITH MarketSegmentsAll (MSID, MSVersion, MSName, MarketSegmentFK, SegmentCategoryFK, RegionFK, country code, CountryFK, GlobalSegmentFK, MSLevel, MSCode, FirstActiveYear, LastActiveYear, Label, RootMarketSegmentFK, CropSegmentFK, CropFK) AS
  (
  -Definition of anchor member
  SELECT ms.ID, Mrs. Version ms. name, Mrs. MarketSegmentFK, Mrs. SegmentCategoryFK, Mrs. RegionFK, r.CountryCode, r.ID as CountryFK, Mrs. GlobalSegmentFK, 1, MSCode = CAST (ms. GlobalSegmentFK as nvarchar (50)), Mrs. FirstActiveYear, Mrs. LastActiveYear, gs. Label, ms.ID, gs. CropSegmentFK, gs. CropFK
  MarketSegment AS ms
  Join region r on r.id = ms. RegionFK
  Join GlobalSegment GS on gs.id = MS GlobalSegmentFK.
  If not of ms. GlobalSegmentFK is null
  UNION ALL
  -Recursive member definition
  SELECT ms.ID, Mrs. Version ms. name, Mrs. MarketSegmentFK, Mrs. SegmentCategoryFK, Mrs. RegionFK, msc. CountryCode, msc. CountryFK, msc. GlobalSegmentFK, msc. MSLevel + 1, CAST (MSCode + case when Ms..) SegmentCategoryFK is null then "another '-' + CAST (ms. SegmentCategoryFK as nvarchar (3)) end as nvarchar (50)), Mrs. FirstActiveYear, Mrs. LastActiveYear, msc. Label, msc. RootMarketSegmentFK, msc. CropSegmentFK, msc. CropFK
  MarketSegment AS ms
  JOIN MarketSegmentsAll AS msc ON msc. MSID = MarketSegmentFK Ms.
  where Mrs. GlobalSegmentFK is null
  )
  -The statement that executes the CTE
  Select msA.MSLevel,
  msA.MSVersion,
  msA.MSCode,
  msA.MSName,
  msA.MSID,
  msA.MarketSegmentFK,
  msA.SegmentCategoryFK,
  msA.GlobalSegmentFK,
  msA.RegionFK,
  msA.CountryCode,
  msA.CountryFK,
  msA.FirstActiveYear,
  msA.LastActiveYear,
  msA.Label,
  RootMarketSegmentFK =
  CASE
  WHEN msA.MSLevel > 1 THEN msA.RootMarketSegmentFK
  ELSE null
  END,
  MSA. CropSegmentFK,
  MSA. CropFK

  OF MarketSegmentsAll msA

  GO

  This issue is beyond the scope of this site (for consumers) and to be sure, you get the best (and fastest) reply, we have to ask either on Technet (for IT Pro) or MSDN (for developers)

  *

  http://social.technet.Microsoft.com/forums/en-us/home s/fr-U.S./Accueil
  http://social.msdn.Microsoft.com/Forum

• Help with sql query / a subquery to perform the COUNT

  Hello everyone,

  Co-worker colleague asked me to post a request here in hopes of getting more support.  Here's the question:

  There are 3 tables associated with this request.  A table of the application, which displays a number of application open for a particular request, an audit table that shows you all employees who worked on this application and one employee who shows you the details of the employee table.  My colleague is trying to understand what, how to see only applications that have been published by a wizard, but not a Manager.  There are a few applications that worked on both, but he won't see this request in its results.

  Here are the tables

  EMP

  ID	FULL_NAME
  1234	John Doe
  5467	Jane Doe
  2345	Clark Kent
  5432	June Cleaver

  Unfortunately, this table does not have a title column (which was created provider, so we cannot change the internal structure).  My colleague knows who is the Assistant and the Director, then in this case, the first two of the id:

  1234 and 5467 are managers and the other 2 are assistants

  T_APPLICATION

  app_id	app_number	date_opened	app_type
  9018	54778	JANUARY 10, 2014	NETWORK
  9019	54779	JANUARY 11, 2014	DATABASE
  9010	55000	MARCH 12, 2014	MATERIAL

  T_APP_AUDIT

  APP_ID	PROCESSED_BY
  9018	1234
  9018	2345
  9018	5432
  9019	2345
  9019	5432
  9010	5432

  So, here is the actual query, I was given: it is actually to check the number of times that each application has been published per person:

  Select a.app_id, c.full_name, count (*) that controls

  t_application a, t_app_audit b, c of the emp

  where a.app_id = b.app_id and b.processed_by = c.id and

  a.app_type in ('NETWORK', "DATABASE")

  and b.processed not in ('1234, ' 5467')

  GROUP OF A.APP_ID, c.full_name;

  IF I won't see 9018 in my results, since at one time it was edited by a Manager (1234).  Unfortunately, this request does not eliminate the app_id 9018, it eliminates only the name of handlers appear in the query.  I hope I've explained this properly, and any help to point us in the right direction is welcomed.  Thanks in advance.

  Select

  a.app_id

  c.full_name

  , count (*) as the controls

  of t_application one

  t_app_audit b

  c of the emp

  where a.app_id = b.app_id

  and b.processed_by = c.id

  and a.app_type in ('NETWORK', "DATABASE")

  and b.app_id by (not in

  Select app_id

  of t_app_audit

  where processed_by in ('1234, ' 5467')

  )

  GROUP OF A.APP_ID, c.full_name;

• SQLite query processing:-defined SQL error:-it works very well in BB OS6.0 bt not in OS5.0 BB

  Hello

  I'm a newbee in webworks...

  I am trying to use SQlite. I create a table and access the data from it on the same page... it works fine... but when I try to do the same thing in different page it gives the error of SQL batch. Now even once when I click the button to access from this page it works fine.

  I mean that the SQL query does not work in the first time. the second time it works.

  It works great in BB OS6.0 bt not in OS5.0 BB

  What a timing problem in 5.0 or something else...?

  Please let me know the problem. I'm stuck... Help, please!

  Thank you, Joy Gupta

  Hi joygupta,

  It is important to realize that all SQL database api is written to be used asynchronously. This means in general in order to ensure that your code works you must perform your events one after the other. If you look around these forums there are plenty of examples of people making small errors that have been fixed in this way.

  If you need help I'd post your code.

• Query on v$ sql view

  Hello
  
  V$ sql inside view we have columns
  
  1 ELAPSED_TIME - out of time (in microseconds) used by this slider for the analysis, execution and recovery
  
  2 CPU_TIME - time (in microseconds) CPU used by this slider for the analysis, execution and fetch
  
  3. OPERATIONS - number of executions that have taken place on this object because it has been brought into the library cache
  
  1 I knew was that it took these many seconds to run the particular query.
  
  My request is that the ELAPSED_TIME, the CPU_TIME are for single execution or any performance of this query?
  
  If these are to all executions, so I guess this time of execution by executing unique will be: = ELAPSED_TIME/EXECUTIONS and CPU times a single run will be: = CPU_TIME / EXECUTIONS.
  
  Right?
  
  Is there an another way as well as to find the running time by a single execution of a SQL?
  
  Thank you
  oratest

  The column elapsed_time and cpu_time are cumulative so yes you have to divide by the executions of a particular cursor to get averages for IT... with regard to the time of a particular execution of a cursor - what are you doing here? Y at - it a particular session is running slowly? If so you could follow that execution of the request for individual values.

  If you try to get more accurate averages for particular times try to search in the AWR data - dba_hist_sqlstat, containing the image from each AWR snapshot, so you can work the deltas, then the average elapsed_time at certain times of the day.

  HTH, thank you

  Paul

• SQL Performance question

  Hello
  
  The following query performs badly when the predicate
  
  AND (v_actionFlag IS NULL or ACTION_CODE = v_actionFlag)
  
  is present. In all executions of the query v_actionFlag will be NULL. In addition, because of the plan when the predicate is included, the returned results are incorrect. We seek to treat rows with the lowest priority. With the included predicate query performs the join, gets 20 lines, sorts, and puts back them rather than getting 20 lines with the lowest priority through the index of QUEUE_TAB0 and return of these.
  
  The questions I have are-
  
  -Why the predicate affects the query in this way
  -What is the difference between the HASH JOIN ANTI and HASH JOIN RIGHT ANTI
  
  
  We were able to remove this predicate as the functionality it supports has not yet been implemented.
  
  
  
  Background
  
  Version of DB - 10.2.0.4
  optimizer_features_enable - 10.2.0.4
  optimizer_mode - ALL_ROWS
  

  Table
  
  - table has approximately 475,000 rows and the statistics are up to date
  
  
  sql> desc queue_tab
   Name                                      Null?    Type
   ----------------------------------------- -------- ----------------------------
   ENTITY_KEY                                NOT NULL NUMBER(12)
   ENTITY_TYPE                               NOT NULL CHAR(1)
   ACTION_CODE                               NOT NULL CHAR(1)
   REPORT_NO                                 NOT NULL NUMBER(12)
   PRIORITY                                  NOT NULL NUMBER(4)
  
  
  
  Indexes
  
  Primary Key (QUEUE_TAB_PK)
  
   ENTITY_KEY                                 
   ENTITY_TYPE                                
   ACTION_CODE                                
   REPORT_NO 
  
  
  Non Unique Index (QUEUE_TAB0)
  
   PRIORITY  
   ENTITY_KEY   
   ENTITY_TYPE  
   ACTION_CODE 
  
  
  
  Cursor
  
  
          SELECT /*+ INDEX_ASC (main QUEUE_TAB0) */
                 REPORT_NO
               , ENTITY_TYPE
               , ENTITY_KEY
               , ACTION_CODE
               , PRIORITY
            FROM QUEUE_TABV01 main
           WHERE PRIORITY > 1
             AND (v_actionFlag IS NULL OR ACTION_CODE = v_actionFlag )
             AND NOT EXISTS
                 ( SELECT /*+ INDEX_ASC (other QUEUE_TAB_pk) */ 1
                     FROM QUEUE_TABV01 other
                    WHERE main.ENTITY_TYPE = other.ENTITY_TYPE
                      AND main.ENTITY_KEY = other.ENTITY_KEY
                      AND main._ACTION_CODE IN ( constant1, constant2 )
                      AND other.ACTION_CODE IN ( constant3, constant4 ) )
             AND NOT EXISTS
                 ( SELECT 1 FROM QUEUE_TABV01 multi
                    WHERE main.ENTITY_TYPE = multi.ENTITY_TYPE
                      AND main.ENTITY_KEY = multi.ENTITY_KEY
                      AND multi.PRIORITY = 1 )
             AND ROWNUM < rowCount + 1
           ORDER BY PRIORITY, ENTITY_KEY, ENTITY_TYPE,
                    ACTION_CODE;
  
  
                                   
  Plan when predicate "AND (v_actionFlag IS NULL OR ACTION_CODE = v_actionFlag )" is present
  
  
  call     count       cpu    elapsed       disk      query    current        rows
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  Parse        1      0.00       0.00          0          0          0           0
  Execute      1      0.00       0.00          0          0          0           0
  Fetch       21      5.53       5.40          2     780463          0          20
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  total       23      5.53       5.40          2     780463          0          20
  
  Misses in library cache during parse: 0
  Optimizer mode: ALL_ROWS
  Parsing user id: 60     (recursive depth: 1)
  
  Rows     Row Source Operation
  -------  ---------------------------------------------------
       20  SORT ORDER BY (cr=780463 pr=2 pw=0 time=5400939 us)
       20   COUNT STOPKEY (cr=780463 pr=2 pw=0 time=5400872 us)
       20    HASH JOIN ANTI (cr=780463 pr=2 pw=0 time=5400823 us)
   459033     TABLE ACCESS BY INDEX ROWID QUEUE_TAB (cr=780460 pr=2 pw=0 time=4640394 us)
   459033      INDEX RANGE SCAN QUEUE_TAB0 (cr=608323 pr=1 pw=0 time=3263977 us)(object id 68038)
    10529       FILTER  (cr=599795 pr=1 pw=0 time=2573230 us)
    10529        INDEX RANGE SCAN QUEUE_TAB_PK (cr=599795 pr=1 pw=0 time=2187209 us)(object id 68037)
        0     INDEX RANGE SCAN QUEUE_TAB0 (cr=3 pr=0 pw=0 time=34 us)(object id 68038)
  
  
  
  
  Plan when predicate "AND (v_actionFlag IS NULL OR ACTION_CODE = v_actionFlag )" is removed
  
  
  call     count       cpu    elapsed       disk      query    current        rows
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  Parse        1      0.00       0.00          0          0          0           0
  Execute      1      0.02       0.00          0          0          0           0
  Fetch       21      0.05       0.05          0       6035          0          20
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  total       23      0.07       0.06          0       6035          0          20
  
  Misses in library cache during parse: 1
  Misses in library cache during execute: 1
  Optimizer mode: ALL_ROWS
  Parsing user id: 60     (recursive depth: 1)
  
  Rows     Row Source Operation
  -------  ---------------------------------------------------
       20  SORT ORDER BY (cr=6035 pr=0 pw=0 time=54043 us)
       20   COUNT STOPKEY (cr=6035 pr=0 pw=0 time=962 us)
       20    HASH JOIN RIGHT ANTI (cr=6035 pr=0 pw=0 time=920 us)
        0     INDEX RANGE SCAN QUEUE_TAB0 (cr=3 pr=0 pw=0 time=53 us)(object id 68038)
       20     TABLE ACCESS BY INDEX ROWID QUEUE_TAB (cr=6032 pr=0 pw=0 time=701 us)
       20      INDEX RANGE SCAN QUEUE_TAB0 (cr=6001 pr=0 pw=0 time=533 us)(object id 68038)
       40       FILTER  (cr=199 pr=0 pw=0 time=2048 us)
       40        INDEX RANGE SCAN QUEUE_TAB_PK (cr=199 pr=0 pw=0 time=1975 us)(object id 68037)

  user599445 wrote:
  Hello Justin and Camille,

  Thank you for taking the time to look at it. I changed the query to correctly practice the ROWNUM. I run and traced the query with the predicate IS NULL and without, with each track below. As you both have suggested that the predicate appears to have no impact on the plan does. All feedback is appeciated.

  Mark,

  the obvious problem with the new plan is that no record is filtered by the first NOT EXISTS clause (using anti-join operation), and then for each line an index seek is performed that filters the records only about 14 000. It is the search for index that takes most of the time, gets consistent since he performs about 2 e/s logic by research, in total nearly 1 million.

  The last 456 000 rows are then sorted (top n) and the top 20 are returned.

  A possible problem could be that the optimizer does not switch mode optimization first_rows_N due to the variable binding used in the filter ROWNUM.

  You can try to execute the statement using a literal (ROWNUM< 21)="" instead="" of="" the="" bind="" variable="" to="" see="" if="" it="" changes="">

  I think in this case, it could be much more effective for the QUEUE_TAB0 of the market index in the order requested and perform the two NOT EXISTS clause as activities of recursive filters provided as your ROWNUM predicate is generally rather low.

  Be aware however that is you do not use a "binary" NLS_SORT index parameter can not be used for an operation of NOSORT ORDER BY STOPKEY of CHAR values, so please check your settings NLS (NLS_SESSION_PARAMETERS. PARAMETER = "NLS_SORT") in which case the optimizer will not use the index for sorting. Note that the NLS parameters are customer specific and can theoretically be different for each session / client.

  You can test this by using a query simple top N: SELECT * FROM (SELECT * ACTION_CODE, ENTITY_TYPE, ENTITY_KEY, QUEUE_TAB ORDER OF PRIORITY) WHERE ROWNUM<>

  If it does not use the QUEUE_TAB0 index to stop the sort operation, you might have a problem with the NLS parameters.

  In order to prevent the transformation of the GUESSED you can also try adding a hint NO_UNNEST two subqueries ("SELECT / * + NO_UNNEST * /...") ("in the respective subquery) and you can also try to switch mode FIRST_ROWS (n) using for example the FIRST_ROWS indicator (20) in the body of the request (but which must be done by the ROWNUM predicate).

  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/

• Using APEX_ITEM in SQL performance issues?

  Hello
  
  I was wondering if using APEX_ITEM.* in your SQL source for a report would give some performance issues? I expect the report to bring a little more than 3000 documents. When I developed it it was working fine but we had 150 cases or so, but now we have migrated demand during our test the page system will take about 2 minutes to load. Here is my SQL to create the report:
  
  Select distinct
  initcap (MPa.pa_name) | ' (' || sd. DESIGNATION_CODE | ')' site.
  FRC. REPORT_DESCRIPTION report_category,
  MF. Function FEATURE_DESC
  decode (cmf. SELECTED_FOR_QA, 'Y', 'X', ' N ',' ') QA,.
  () apex_item.select_list_from_query
  21,
  CPF. ASSIGN_TO,
  «Select ss.firstname | "» '' || SS. Surname d, ss. STAFF_NUMBER r
  of snh_staff ss,.
  snh_management_units smu,
  m_pa_snh_area psa
  where ss. MU_UNIT_ID = EMS. UNIT_ID
  and smu. UNIT_ID = psa. UNIT_ID
  and ss. CURRENTLY_EMPLOYED = "Y"
  and psa. SCM_LEAD = "Y"
  and psa. MAIN_AREA = "P"
  and psa.PA_CODE = ' | MPa.pa_code,
  NULL,
  '' YES. ''
  NULL,
  (' ') assign_to,.
  () apex_item.select_list_from_query
  22,
  Decode (to_char (cpf.planned_fieldwork, ' DD/MM /'),)
  30/06 /', 'Q1 ' | TO_CHAR (planned_fieldwork, 'YYYY'),
  30/09 /', 'T2 ' | TO_CHAR (planned_fieldwork, 'YYYY'),
  31/12 /', 'Q3 | TO_CHAR (planned_fieldwork, 'YYYY'),
  31/03 /', 'T4 ' | TO_CHAR (planned_fieldwork-365, "YYYY").
  TO_CHAR (cpf.planned_fieldwork, "YYYY")),
  ' select r d,
  of CM_CYCLE_Q_YEARS') planned_fieldwork,.
  () apex_item.select_list_from_query
  23,
  Decode (to_char (cpf.planned_cmf, ' DD/MM /'),)
  30/06 /', 'Q1 ' | TO_CHAR (planned_cmf, 'YYYY'),
  30/09 /', 'T2 ' | TO_CHAR (planned_cmf, 'YYYY'),
  31/12 /', 'Q3 | TO_CHAR (planned_cmf, 'YYYY'),
  31/03 /', 'T4 ' | TO_CHAR (planned_cmf-365, "YYYY").
  TO_CHAR (cpf.planned_cmf, "YYYY")),
  ' select r d,
  of CM_CYCLE_Q_YEARS') planned_cmf,.
  () apex_item.select_list_from_query
  24,
  CPF.monitoring_method_id,
  "(Select METHOD, MONITORING_METHOD_ID from cm_monitoring_methods where active_flag ="Y"') monitoring_method,
  (apex_item). Text
  25,
  CPF.pre_cycle_comments,
  15,
  255,
  "title =" '. CPF.pre_cycle_comments |' » ',
  'annualPlanningComments '.
  || TO_CHAR (cpf. Comment PLAN_MON_FEATURE_ID)),
  (apex_item). Text
  26,
  TO_CHAR (cpf. CONTRACT_LET, 'MON-DD-YYYY'),
  11,
  (11) contract_let,
  (apex_item). Text
  27,
  TO_CHAR (cpf. CONTRACT_REPORT_PLANNED, 'MON-DD-YYYY'),
  11,
  (11) contract_report,
  (apex_item). Text
  28,
  CPF. ADVISOR_DATA_ENTRY,
  11,
  (11) advisor_entry,
  CMS.complete_percentage | ' ' || status of CMS. Description,
  (apex_item). Text
  29,
  TO_CHAR (cpf. RESULT_SENT_TO_OO, 'MON-DD-YYYY'),
  11,
  (11) result_to_oo,
  CPF. PLAN_MON_FEATURE_ID,
  CMF. MONITORED_FEATURE_ID,
  mpa.PA_CODE,
  MPF. SITE_FEATURE_ID
  of fm_report_category ERS,
  m_feature mf,
  m_pa_features mpf,
  m_protected_area mpa,
  snh_designations sd,
  cm_monitored_features FMC,
  cm_plan_mon_features FCP,
  cm_monitoring_status cms,
  cm_cycles cc,
  msa m_pa_snh_area,
  snh_management_units smu,
  ssa snh_sub_areas
  where frc. REPORT_CATEGORY_ID = mf. REPORT_CATEGORY_ID
  and mf. Feature_code = mpf. FEATURE_CODE
  and mpa.PA_CODE = mpf.PA_CODE
  and mpa. DESIGNATION_ID = sd. DESIGNATION_ID
  and the mpf. SITE_FEATURE_ID = FCM. SITE_FEATURE_ID
  and CME. MONITORED_FEATURE_ID = cpf. MONITORED_FEATURE_ID
  and cms. MONITORING_STATUS_ID = FCM. MONITORING_STATUS_ID
  and cc. CYCLE # = FCM. CYCLE #.
  and msa.PA_CODE = mpa.PA_CODE
  and msa. UNIT_ID = EMS. UNIT_ID
  and msa. SUB_AREA_ID = ass. SUB_AREA_ID
  and cc. CURRENT_CYCLE = 'Y '.
  and msa. MAIN_AREA = 'P '.
  and msa. SCM_LEAD = 'Y '.
  and the mpf. INTEREST_CODE in (1,2,3,9)
  and ((nvl (: P6_REPORTING_CATEGORY, 'TOUT') = 'ALL'))
  and to_char (frc. FCA_FEATURE_CATEGORY_ID) = case nvl (: P6_BROAD_CATEGORY, 'ALL') when "ALL" then to_char (frc. (FCA_FEATURE_CATEGORY_ID) else: P6_BROAD_CATEGORY end)
  or (nvl (: P6_REPORTING_CATEGORY, 'ALL')! = 'ALL')
  and to_char (mf. REPORT_CATEGORY_ID) = case nvl (: P6_REPORTING_CATEGORY, 'ALL') when "ALL" then to_char (mf. REPORT_CATEGORY_ID) else: P6_REPORTING_CATEGORY end))
  and ((nvl (: P6_SNH_SUB_AREA, 'TOUT') = 'ALL'))
  and to_char (msa. UNIT_ID) = case nvl (: P6_SNH_AREA, 'ALL') when "ALL" then to_char (msa. (UNIT_ID) else: P6_SNH_AREA end)
  or (nvl (: P6_SNH_SUB_AREA, 'ALL')! = 'ALL')
  and to_char (msa. SUB_AREA_ID) = case nvl (: P6_SNH_SUB_AREA, 'ALL') when "ALL" then to_char (msa. SUB_AREA_ID) else: P6_SNH_SUB_AREA end))
  and ((nvl (: P6_SITE, 'TOUT')! = 'ALL'))
  and mpa.PA_CODE =: P6_SITE)
  or nvl (: P6_SITE, 'ALL') = 'ALL')
  
  As you can see I have 9 calls the APEX_ITEM API and when I get out them the works of report that I expect.
  
  Has anyone else ran into this problem?
  
  We're currently on APEX: 3.0.1.00.08 and using Oracle9i Enterprise Edition Release 9.2.0.8.0 - 64 bit, Production database.
  
  Thanks in advance,
  Paul.

  Try to remove all except one of the calls apex_item.select_list_from_query, and then rewrite this one to use subquery factoring. Now compare at the same time for the same query with and without subquery factoring. In addition, 500 lines is a realistic number that you expect someone to change?