Tuning SQL request

Similar Questions

• Tuning sql of a product to the seller without changing the sql statement

  Hello
  
  We have a product of the provider that generates the SQL statement. For a query, we get the answer in 15 seconds. But users are asking if we can bring it back to 5 seconds. Limitation is the query can not be changed. He used about 10 to 12 tables and bit complex query.
  
  What kind of options could be evaluated if we are to improve the performance of a query (not sure if she could never be reduced to 5 seconds)
  without making any change to the query.
  
  Database Version: Oracle 10.2.0.4
  
  Thank you
  Delphine

  Hello

  http://www.Oracle-base.com/articles/10G/AutomaticSQLTuning10g.php

  your software is enterprise or standard?

  Tuning Pack & pack diagnosis are extra cost option with the standard edition.

  & the useful note * automatic SQL Tuning - SQL [271196.1 ID] profiles *.

  http://www.Oracle.com/us/corporate/pricing/technology-price-list-070617.PDF

  Thank you

  Published by: CKPT November 5, 2010 11:12

• Tuning SQL query

  Oracle Database 10 g Enterprise Edition release 10.2.0.3.0 - 64bi
  PL/SQL version 10.2.0.3.0 - Production
  CORE Production 10.2.0.3.0
  AMT for IBM/AIX RISC System/6000: Version 10.2.0.3.0 - production
  NLSRTL Version 10.2.0.3.0 - Production
  
  I have a request involoved sweep the entire table with 5 billion lines and its execution plan indicates that it uses almost 40 tablespace temp G takes a lot of time. I am trying to tune by the biggest table based on a single partitioning column and run this query based on partitioned column at once does not work. This table is also used by other queries, I'm not sure whether paritioning of this table is wrong another query?
  
  Thanks in advance.

  PL see these discussions on how to post a request for Setup:

  HOW to: Validate a query of SQL statement tuning - model showing

  When your query takes too long...

  HTH
  Srini

• Auto Tuning SQL

  Hello
  I installed a new database and you can see that automatic SQL Tuning is by default enabled.
  It's best practices and there is no end with SQL runtime performance downgrade?
  Oracle 11.2.0.3 database
  
  Also where in 12 c EM find all active SQL Profiler?
  Concerning
  933746

  Read the documentation
  http://docs.Oracle.com/CD/B28359_01/server.111/b28274/sql_tune.htm

• Tips for Tuning SQL error om

  Hi guys,.
  
  There is an error when switching to SQL Tuning Tips Top SQL compared to expected.
  the error is:

  ORA-13607: The specified task or object id sql_id_tuning_task_SD already exists 

  Normally this task should be done by SqlDeveloper, ain't it?
  What can I do?
  
  10 x Florin

  Hi Florin,

  I'm sorry that I misinterpreted your question in my previous answer. Of course, you don't talk about setting SQL as run from a worksheet, but rather discovers reports | Reports of data dictionary. Administration of databases | Top of page SQL | Top of page SQL of Waits. You selected a specific line (SQL statement) of the top SQL grid waits, then tried to pass to the sql tuning tips of the pane tab below.

  The sql_id_tuning_task_SD must have been deleted automatically at the end of the previous call to this tab somehow, it not deleted. Have test you this feature on two copies of the SQL Developer at the same time? Probably not.

  Anyway, as noted above, use dbms_sqltune.drop_tuning_task to work around the problem.

  Kind regards
  Gary

• Tuning sql by using the xmltable() function.

  Hi all
  
  With Oracle 10g 10.2.0.1, Solaris 10
  
  Under query very slow... for 25 k at all just 100 KB xml documents.
  

  SELECT HQ_FLAG ,
      REGSTR_FLAG ADDRESS_STAMP ,
      BUILDING ,
      street_address ,
      PO_BOX ,
      CITY ,
      STATE_REGION ,
      POSTAL_CODE ,
      country_code ,
      a.ORG_ID
  FROM common.BID_XML_DATA a,
      xmltable( 'for $i in IntegrationBID/Organization   
  return <Row OrgID="{$i/OrgID}">{ $i/OrgGeneralInformation/Address } </Row>' passing xml_data 
  columns 
  hq_flag varchar2(5) path 'Address/@HeadquartersFlag', 
  regstr_flag varchar2(5) path 'Address/@RegisteredFlag', 
  address_stamp varchar(10) path 'Address/@LastUpdated', 
  building varchar(40) path 'Address/Building', 
  street_address varchar(40) path 'Address/StreetAddress', 
  po_box varchar(40) path 'Address/POBox', 
  city varchar(40) path 'Address/City', 
  state_region character(3) path 'Address/StateOrRegion', 
  postal_code varchar(10) path 'Address/PostalCode', 
  country_code character(3) path 'Address/Country/@Code', 
  Org_ID NUMBER(19) path '@OrgID') b;
  
  SQL> desc common.BID_XML_DATA
   Name                                                                                Null?    Type
   ----------------------------------------------------------------------------------- -------- --------------------------------------------------------
   XML_DATA                                                                                     XMLTYPE
   BID_INSERT_STAMP                                                                             DATE
   RN                                                                                           NUMBER(5)
   ORG_ID                                                                                       NUMBER(19)
  
  --------------------------------------------------------------------------------------------------------------
  | Id  | Operation                           | Name                   | Rows  | Bytes | Cost (%CPU)| Time     |
  --------------------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT                    |                        |  8168 |   749K|    27   (0)| 00:00:01 |
  |   1 |  MERGE JOIN CARTESIAN               |                        |  8168 |   749K|    27   (0)| 00:00:01 |
  |   2 |   TABLE ACCESS FULL                 | BID_XML_DATA           |     1 |    92 |     3   (0)| 00:00:01 |
  |   3 |   BUFFER SORT                       |                        |  8168 | 16336 |    24   (0)| 00:00:01 |
  |   4 |    COLLECTION ITERATOR PICKLER FETCH| XMLSEQUENCEFROMXMLTYPE |       |       |            |          |
  --------------------------------------------------------------------------------------------------------------

  I tried to create indexes on this table... but in vain...

  SQL> CREATE INDEX common.XML_DATA_IDX ON common.BID_XML_TABLE (xml_data)
    2  INDEXTYPE IS XDB.XMLIndex
  PARAMETERS ('PATHS (INCLUDE (IntegrationBID/Organization/OrgID
    3    4                                                  IntegrationBID/Organization/OfficerInformation/Officer/ID
    5                                                  IntegrationBID/Organization/WebLinkInfo
    6  IntegrationBID/Organization/FilingSpecificInformation/FilingInformation/CompanyID
  IntegrationBID/Organization/FilingSpecificInformation/FilingInformation/ContactInfo
    7    8        IntegrationBID/Organization/FilingSpecificInformation/FilingInformation/Advisors/TransferAgent/Name
    9        IntegrationBID/Organization/OfficerInformation/Officer/PersonInformation/Name
   10        IntegrationBID/Organization/OfficerInformation/Officer/OfficerContacts
   11        IntegrationBID/Organization/OfficerInformation/Officer/PersonInformation/EducationHistory/Education
   12        IntegrationBID/Organization/OfficerInformation/Officer/PositionInformation/TenureDates
   13        IntegrationBID/Organization/OfficerInformation/Officer/PositionInformation/Titles/Designation
   14        IntegrationBID/Organization/OfficerInformation/Officer/PositionInformation/CommitteeMemberships/Committee
        IntegrationBID/Organization/OfficerInformation/Officer/SalaryInformation/CompensationPeriod
   15   16                              )
   17                      NAMESPACE MAPPING
   18                           (xmlns="http://www.schemas.thomsonreuters.com/IntBID03")
   19                     )
   20               PATH TABLE      BID_XML_path_table
   21               PATH ID INDEX   BID_XML_pathid_ix
   22               ORDER KEY INDEX BID_XML_orderkey_ix
   23               ASYNC (SYNC ALWAYS) STALE (FALSE)
   24             ');
  CREATE INDEX common.XML_DATA_IDX ON common.BID_XML_TABLE (xml_data)
  *
  ERROR at line 1:
  ORA-29896: Length of PARAMETER string longer than 1000 characters
  
  
  SQL> CREATE INDEX common.BID_XML_DATA_IDX ON common.BID_XML_DATA (xml_data)
    2  INDEXTYPE IS XDB.XMLIndex
  PARAMETERS ('PATHS (INCLUDE (IntegrationBID/Organization/OrgID
    3    4                               IntegrationBID/Organization/OfficerInformation/Officer/ID
    5                               IntegrationBID/Organization/WebLinkInfo
    6                          IntegrationBID/Organization/FilingSpecificInformation/FilingInformation/CompanyID
                              )
    7    8                      NAMESPACE MAPPING
    9                           (xmlns="http://www.schemas.thomsonreuters.com/IntBID03")
                     )
   10   11               PATH TABLE      BID_XML_path_table
   12               PATH ID INDEX   BID_XML_pathid_ix
   13               ORDER KEY INDEX BID_XML_orderkey_ix
   14               ASYNC (SYNC ALWAYS) STALE (FALSE)
   15             ');
  CREATE INDEX common.BID_XML_DATA_IDX ON common.BID_XML_DATA (xml_data)
  *
  ERROR at line 1:
  ORA-29958: fatal error occurred in the execution of ODCIINDEXCREATE routine
  ORA-30955: internal event to enable value index creation

  Could someone help me in creating xmlindex... and also to grant this request.
  
  -Yasser

  You have 2 options for this make effective and efficient:

  1) move to 11gRx and change the XMLTYPE (based CLOB) column as XML binary XMLType
  (2) in 10 g, the only option to make this work is to change the CLOB, XMLType column base in a relational object XMLType one.

  HTH

  M.

• Advisor tuning SQL question

  Hello
  Version 10203
  Please look at the results of the created task of tuning.
  The task has been created, but did not return any results.
  Who is oracle average cant advice, or maybe I made mistakes?
  
  SQL > declare
  l_sql_id 2 v$session.prev_sql_id%type;
  3 l_tuning_task varchar2 (30);
  4 start
  l_sql_id 5: = "bf8wy6bhr6nak";
  6 l_tuning_task: = dbms_sqltune.create_tuning_task (sql_id = > l_sql_id);
  7 dbms_sqltune.execute_tuning_task (l_tuning_task);
  8 dbms_output.put_line (l_tuning_task);
  9 end;
  10.
  
  TASK_32137
  
  PL/SQL procedure successfully completed.
  
  SQL >
  SQL > fixed line 300
  SQL > select dbms_sqltune.report_tuning_task ('TASK_32137') of double;
  
  DBMS_SQLTUNE. REPORT_TUNING_TASK ('TASK_32137')
  --------------------------------------------------------------------------------
  GENERAL INFORMATION SECTION
  ----------------------------------------------------
  
  SQL >
  
  
  Thank you

  Hi user546852,

  dbms_sqltune.report_tuning_task returns a CLOB.

  Try the LONG parameter to 1000000 in your session:

  SQL> set long 1000000
  

  Greetings - Don Lewis

• help for tuning sql query

  Hi all
  
  The application team uses under request and asked for recommendation for listening to this query.
  The concern was
  
  (1) how to avoid the query select sup as a query of subselects 3 is here which may degrade the performance of the query.
  (2) in any case to avoid using the JOBBERDETAILS 5 times in NVL function.
  
  
  SELECT "0". SM. SITE_ID AS "SD_SITE_NUMBER."
  SA. ADDR_L1 AS "SD_SITE_ADDRESS."
  SA. CITY_NAME AS "SD_SITE_CITY."
  SA. STATE_AC AS "SD_SITE_STATE."
  SUBSTR (SA. ZIP_CD, 0, 5) AS "SD_SITE_ZIP."
  DECODE (LENGTH (TRIM (SA. ZIP_CD)), 5, '0000', SUBSTR (SA. ZIP_CD, 6, 4)) AS "SD_SITE_ZIP4."
  SM. SITE_NAME AS "SD_NAME."
  NVL ((SELECT SM. AM_SITE DOJ_NAME. B JOBBER_BASE WHERE B.SITE_ID = SM. (SITE_ID),' ') AS "SD_NAME2."
  NVL (AM_SITE. JOBBERDETAILS (SA. (SITE_ID, 'OWNER_ADDRESS'),' ') AS "SD_MAILING_ADDRESS."
  NVL (AM_SITE. JOBBERDETAILS (SA. (SITE_ID, 'OWNER_CITY'),' ') AS "SD_MAILING_CITY."
  NVL (AM_SITE. JOBBERDETAILS (SA. (SITE_ID, 'OWNER_STATE'),' ') AS "SD_MAILING_STATE."
  NVL (AM_SITE. JOBBERDETAILS (SA. (SITE_ID, 'OWNER_ZIP_CODE'),' ') AS "SD_MAILING_ZIP_CODE."
  NVL (AM_SITE. JOBBERDETAILS (SA. (SITE_ID, 'OWNER_PHONE'), "0000000000") AS "SD_PHONE_NUMBER."
  NVL ((SELECT ST. PHONE FROM AM_SITE. WHERE THE ST. SITE_TELEPHONE ST. SITE_ID = SM. SITE_ID AND SUPERIOR (ST. PHONE) = 'P'), "0000000000") AS "SITE_PHONE_NUMBER."
  NVL ((SELECT B.J_SITE_ID FROM AM_SITE. B JOBBER_BASE WHERE B.SITE_ID = SM. SITE_ID AND AM_SITE. GET_COT (SM. (SITE_ID) = 'J'), "") AS "SD_JOBBER_NUMBER."
  "1" AS "BANK_LEVEL."
  "E' AS"AGENT. "
  SM. DEFERRED_IND AS "DEFFERED_SETTLEMENT_INDICATOR."
  SM. EXCESSIVE_CHAGK_IND AS "EXCESSIVE_CHARGEBACK_INDICATOR."
  NVL (AM_SITE. GET_COT (SM. (SITE_ID),' ') AS "CHANNEL_OF_TRADE."
  DECODE (AM_SITE. GET_COT (SM. ("" "" "SITE_ID),'d", '02', 'J', '11', ' C ', '23', "R", '21', 'N ' 21', ' Z ',' 21', 'NA') AS 'OUTLET_CODE '.
  OF AM_SITE. SM, AM_SITE SITE_MSTR. SITE_ADDR SA
  WHERE SM. SITE_ID = SA. SITE_ID AND SUPERIOR (SA. ADDR_TYPE) = 'P' AND SM. MOP_CD IS NOT NULL
  
  Can someone please help me in setting this query.
  Thanks in advance

  Follower of the Oracle says:
  Hi all

  The application team uses under request and asked for recommendation for listening to this query.
  The concern was

  (1) how to avoid the query select sup as a query of subselects 3 is here which may degrade the performance of the query.

  Use outer joins instead of scalar subqueries. See for example the recent discussion of Tom Kyte: http://asktom.oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:1594885400346999596

  (2) in any case to avoid using the JOBBERDETAILS 5 times in NVL function.

  You need to know what the function does, and replace it with a simple corresponding SQL expression. Most of the time these functions search the recursive SQL which can be very expensive. Although the functional separation is better in terms of encapsulation/maintainability ordinary SQL approach gives better performance if you have a result of great value.

  Have you checked that above two points are key issues of this query? By work without the function calls and scalar subqueries, you can check if it performs much better. If this isn't the case, you will need to investigate on what is still the main culprit.

  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/

• Tuning sql (where order clauses)

  Hello

  This request is really slow, because it calls the function f to each line (table1 and table2 may have more than 10000 lines)

  SELECT * FROM table1 t1 inner join tabl2 t2..............
  WHERE where_clause_1
  AND where_clause_2
  AND f(t1.a, t2.a) = 'Y'
  

  Returns 20 lines

  Howerver, this query is much faster

  SELECT * FROM table1 t1 inner join tabl2 t2..............
  WHERE where_clause_1
  AND where_clause_2
  -- AND f(t1.a, t2.a) = 'Y'
  

  Returns 24 ranks

  I try that, but it is too slow:

  SELECT * FROM (
       SELECT ... FROM table1 t1 inner join tabl2 t2..............
       WHERE where_clause_1
       AND where_clause_2
  )
  WHERE f(t1_a, t2_a) = 'Y'
  

  I would like to SELECT by where_clause_1 filter then where_clause_2 and finally the function call.

  How can I do?

  Thank you!

  1. SELECT * FROM)
  2. SELECT / * + NO_MERGE * /... THE T1 from table1 inner join t2 tabl2...
  3. WHERE where_clause_1
  4. AND where_clause_2
  5. )
  6. WHERE f (t1_a, t2_a) = 'Y '.

  Indicates tips NO_MERGE optimizer outer query not combine and query the view of inline in a unique.

• Tuning sql insert that inserts 1 million lines makes a full table scan

  Hi Experts,

  I'm on Oracle 11.2.0.3 on Linux. I have a sql that inserts data into a table of History/Archives of a table main application based on the date. The application table has 3 million lines. and all the lines that are more then 6 months old must go in a table of History/Archives. This was decided recently, and we have 1 million rows that meet this criterion. This insertion in table archive takes about 3 minutes. Plan of the explain command shows a full table scan on the main Board - which is the right thing, because we are pulling 1 million rows in the main table in the history table.

  My question is that, is it possible that I can do this sql go faster?

  Here's the query plan (I changed the names of table etc.)

     INSERT INTO EMP_ARCH
     SELECT *
  FROM EMP M
  where HIRE_date < (sysdate - :v_num_days);
  call     count       cpu    elapsed       disk      query    current        rows
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  Parse        2      0.00       0.00          0          0          0           0
  Execute      2     96.22     165.59      92266     147180    8529323     1441230
  Fetch        0      0.00       0.00          0          0          0           0
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  total        4     96.22     165.59      92266     147180    8529323     1441230
  Misses in library cache during parse: 1
  Misses in library cache during execute: 1
  Optimizer mode: FIRST_ROWS
  Parsing user id: 166
  Rows     Row Source Operation
  -------  ---------------------------------------------------
  1441401   TABLE ACCESS FULL EMP (cr=52900 pr=52885 pw=0 time=21189581 us)
  
  
  

  I heard that there is a way to use opt_param tip to increase the multiblock read County but did not work for me... I will be grateful for suggestions on this. can collections and this changing in pl/sql also make it faster?

  Thank you

  OrauserN

  (1) create an index on hire_date

  (2) tip 'additional' use in the 'select' query '

  (3) run ' alter session parallel DML'; before you run the entire statement

• Tuning SQL - do not understand the plan of the explain command.

  Hi all
  
  I use 11g R2 and I have 2 questions about the setting of a query.
  

  BANNER
  --------------------------------------------------------------------------------
  Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
  PL/SQL Release 11.2.0.3.0 - Production
  CORE    11.2.0.3.0      Production
  TNS for 64-bit Windows: Version 11.2.0.3.0 - Production
  NLSRTL Version 11.2.0.3.0 - Production

  My relevant parameters for the optimizer are:

  NAME                                 TYPE        VALUE
  ------------------------------------ ----------- -----------------------
  --
  optimizer_capture_sql_plan_baselines boolean     FALSE
  optimizer_dynamic_sampling           integer     2
  optimizer_features_enable            string      11.2.0.3
  optimizer_index_caching              integer     0
  optimizer_index_cost_adj             integer     100
  optimizer_mode                       string      ALL_ROWS
  optimizer_secure_view_merging        boolean     TRUE
  optimizer_use_invisible_indexes      boolean     FALSE
  optimizer_use_pending_statistics     boolean     FALSE
  optimizer_use_sql_plan_baselines     boolean     TRUE

  The query I want to run is quite simple. It returns a few exceptions with a filter.
  

   SELECT ERO.DVC_EVT_ID,  E.DVC_EVT_DTTM
   FROM D1_DVC_EVT E,  D1_DVC_EVT_REL_OBJ ERO
   WHERE ERO.MAINT_OBJ_CD = 'D1-DEVICE'
   AND ERO.PK_VALUE1 = :H1
   AND ERO.DVC_EVT_ID = E.DVC_EVT_ID
   AND E.DVC_EVT_TYPE_CD IN ('END-GSMLOWLEVEL-EXCP-SEV-1', 'STR-GSMLOWLEVEL-EXCP-SEV-1')
   ORDER BY E.DVC_EVT_DTTM DESC;

  The execution plan is the following:
  

  Plan hash value: 3627978539
  
  ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  | Id  | Operation                            | Name               | Starts | E-Rows |E-Bytes| Cost (%CPU)| Pstart| Pstop | A-Rows |   A-Time   | Buffers | Reads  |  OMem |  1Mem | Used-Mem |
  ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT                     |                    |      1 |        |       |  7131 (100)|       |       |   1181 |00:00:17.17 | 8627 |   2978 |       |       |          |
  |   1 |  SORT ORDER BY                       |                    |      1 |   3137 |   275K|  7131   (1)|       |       |   1181 |00:00:17.17 | 8627 |   2978 | 80896 | 80896 |71680  (0)|
  |   2 |   NESTED LOOPS                       |                    |      1 |        |       |            |       |       |   1181 |00:00:17.16 | 8627 |   2978 |       |       |          |
  |   3 |    NESTED LOOPS                      |                    |      1 |   3137 |   275K|  7130   (1)|       |       |   2058 |00:00:08.09 | 6709 |   1376 |       |       |          |
  |   4 |     TABLE ACCESS BY INDEX ROWID      | D1_DVC_EVT_REL_OBJ |      1 |   3137 |   125K|   845   (1)|       |       |   2058 |00:00:04.37 |  820 |    799 |       |       |          |
  |*  5 |      INDEX RANGE SCAN                | D1T404S0           |      1 |   3137 |       |    42   (0)|       |       |   2058 |00:00:00.08 |   27 |     23 |       |       |          |
  |   6 |     PARTITION RANGE ITERATOR         |                    |   2058 |      1 |       |     1   (0)|   KEY |   KEY |   2058 |00:00:03.69 | 5889 |    577 |       |       |          |
  |*  7 |      INDEX UNIQUE SCAN               | D1T400P0           |   2058 |      1 |       |     1   (0)|   KEY |   KEY |   2058 |00:00:03.66 | 5889 |    577 |       |       |          |
  |*  8 |    TABLE ACCESS BY GLOBAL INDEX ROWID| D1_DVC_EVT         |   2058 |      1 |    49 |     2   (0)| ROWID | ROWID |   1181 |00:00:09.05 | 1918 |   1602 |       |       |          |
  ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  
  Peeked Binds (identified by position):
  --------------------------------------
  
     1 - (VARCHAR2(30), CSID=178): '271792300706'
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     5 - access("ERO"."PK_VALUE1"=:H1 AND "ERO"."MAINT_OBJ_CD"='D1-DEVICE')
         filter("ERO"."MAINT_OBJ_CD"='D1-DEVICE')
     7 - access("ERO"."DVC_EVT_ID"="E"."DVC_EVT_ID")
     8 - filter(("E"."DVC_EVT_TYPE_CD"='END-GSMLOWLEVEL-EXCP-SEV-1' OR "E"."DVC_EVT_TYPE_CD"='STR-GSMLOWLEVEL-EXCP-SEV-1'))

  So, as you can see, rank 8, I have a TABLE ACCESS BY GLOBAL INDEX ROWID. But what I am failling to see is how Oracle display an ACCESS BY GLOBAL INDEX ROWID TABLE without using any index. As the thought that Oracle has always been a ROWID due to an index.
  
  I also have an index on the DVC_EVT_TYPE_CD column in my table (line 8 of the predicate information section)
  
  And finally, what would be your suggestions to improve the performance of this query...
  
  Thank you very much.

  If I read content (RowSource) statistical information and plan properly, then access the table in step 4 on D1_DVC_EVT_REL_OBJ needs dry 4.37 and accesses 820 buffers. If you had an index D1_DVC_EVT_REL_OBJ (MAINT_OBJ_CD, PK_VALUE1, DVC_EVT_ID) I guess this table access could be avoided. To avoid the access of the table on D1_DVC_EVT an index on D1_DVC_EVT (DVC_EVT_ID, DVC_EVT_TYPE_CD, DVC_EVT_DTTM) should be sufficient.

  I think that these indices would improve the performance of the query, but of course, they would have a negative impact on the performance of DML on the table and they could influence other queries on the table.

• Tuning Sql

  Hello
  
  Im a dba.
  The developer asked me to help resolve its sql query. Its quite a query complex and has many joins of tables.
  It is the duty of a dba to tune the sqlquery? How can I suggest or modify the query for optimal performance? When I myself can't understand :(
  Is to explain the way forward plan?
  
  Can you suggest any solution please.
  
  Thank you very much
  
  Published by: 843228 on April 5, 2011 02:58

  10g and 11g offer better/improved/different alternatives to explain the plan and TKPROF but yes the basic principles of interpretation of EXPLAIN PLAN and TKPROF remain the same between different versions.

• Tuning SQL tips

  Hello
  
  I need some General (I can't provide you with an implementation plan) tips for setting this statement running in mode CBO 9i:
  

  SELECT 
        TAB_C1.CLIENT_NR, TAB_C1.DD_NR, last_day(trunc(TAB_C1.BELEGDAT)),
        0, TAB_C2.VALUE_DIM ,
        nvl(SUM(DECODE(TAB_A.FOLGBU || TAB_A.ZUABNEUT,'0A',0,'1A',0,'0Z',1,'1Z',0) * TAB_C2.VALUE),0) ,
        nvl(SUM(DECODE(TAB_A.FOLGBU || TAB_A.ZUABNEUT,'0A',1,'1A',0,'0Z',0,'1Z',0) * TAB_C2.VALUE),0) ,
        nvl(SUM(DECODE(TAB_A.FOLGBU || TAB_A.ZUABNEUT,'0A',0,'1A',0,'0Z',0,'1Z',1) * TAB_C2.VALUE),0) ,
        nvl(SUM(DECODE(TAB_A.FOLGBU || TAB_A.ZUABNEUT,'0A',0,'1A',1,'0Z',0,'1Z',0) * TAB_C2.VALUE),0) ,
        0 ,max(TAB_C1.ROWSEQ * 1000) + TAB_C2.BLENDTYPE * 100 + TAB_C2.VALUE_DIM
    FROM TAB_C1,
         TAB_A,
         TAB_C2,
         TAB_C3,
         TAB_B
   WHERE TAB_C1.ACC_TYPE = 'N'
         AND TAB_C1.CANCEL = 0
         AND TAB_A.CLIENT_NR = TAB_C1.CLIENT_NR
         AND TAB_A.ACC_MODE = TAB_C1.ACC_MODE
         AND TAB_C3.CLIENT_NR = TAB_C1.CLIENT_NR
         AND TAB_C3.ACC_TYPE = TAB_C1.ACC_TYPE
         AND TAB_C3.ACC_NR = TAB_C1.ACC_NR
         AND TAB_C3.POS = TAB_C1.POS
         AND TAB_C3.ACC_DAT = TAB_C1.ACC_DAT
         AND TAB_C2.CLIENT_NR = TAB_C1.CLIENT_NR
         AND TAB_C2.ACC_TYPE = TAB_C1.ACC_TYPE
         AND TAB_C2.ACC_NR = TAB_C1.ACC_NR
         AND TAB_C2.POS = TAB_C1.POS
         AND TAB_C2.ACC_DAT = TAB_C1.ACC_DAT
         AND TAB_B.CLIENT_NR = TAB_C2.CLIENT_NR
         AND TAB_B.AMOUNT_KEY = TAB_C2.VALUE_DIM
         AND TAB_B.AMOUNT_TYPE = 0
   GROUP BY TAB_C1.CLIENT_NR,
            releasetype,
            releaseid,
            releasegrp,
            releaseseq,
            last_day(trunc(TAB_C1.BELEGDAT)),
            blendtype,
            VALUE_DIM;

  Table           Rows     PK
  TAB_A          300     CLIENT_NR, ACC_MODE
  TAB_B          600     CLIENT_NR, AMOUNT_KEY
  TAB_C1          200.000     CLIENT_NR, ACC_TYPE, ACC_NR, POS, ACC_DAT
  TAB_C2          1 Mio.     CLIENT_NR, ACC_TYPE, ACC_NR, POS, ACC_DAT, COL_BP, VALUE_DIM, COL_BT
  TAB_C3          350.000     CLIENT_NR, ACC_TYPE, ACC_NR, POS, ACC_DAT, COL_RI, COL_RT, COL_RG, COL_RS, COL_RL

  In my opinion, I should try to avoid function calls (nvl (sum...), but I don't ' have an idea how to achieve this in the best way.) Maybe you can give me some advice to fix this or tell me other options to improve performance. The view is used to populate a table.
  
  Thanks in advance
  
  Kind regards
  
  Matthias

  I'd be really surprised if change anything in the select list would improve performance much. Integrated Oracle features most of the time about as fast as the selection of the column without using a function.

  I have to focus my efforts on her go and where parts, which is the part that causes all i/o, which is generally the most expensive and time-consuming part of the query. Without looking too close to your request, and without knowing anything about your data, I note that tab_b and tab_c3 are not used in your selection list, and only tab_b has a selective predicate against it. Are you sure have need of these two tables?

  Can you add more selective predicates against some or all tables without changing the query results? For example, only the tab_b.amount_type = 0 implies something of perhaps a range of dates or the range of accounts in the other tables.

  You say that

  restrictions:

  TAB_C1. CANCEL = 0
  TAB_B.AMOUNT_TYPE = 0

  a very low selectivity for indexing one of these columns seems to be not not very useful

  but you also have a predicate on TAB_C1. ACC_TYPE = ' N AND TAB_C1. CANCEL = 0. This combination is more selective?

  The list is long, but as others have said, without more information, we are only guessing.

  John

• SQL Tuning sets and SQL Tuning Advisor.

  Hello

  We run oracle11g r2 where under win server 2008 R2.

  How can I find out when Tuning SQL and SQL Tuning games advisors are enabled in my database.

  Is Oracle11g has default setting YES for this tuning packs

  Thank you

  It seems you found somone activated of sets and the setting of advisers.  as others have said, theyre part of the D & T and theyre always there but only, you become eligible for a permit after that you use.   This will tell you the first time they have been used if at all, the key here for you field be FIRST_USAGE_DATE that must be completed only if detected_usages > 0

  fixed lines 180

  Col name format a30

  SELECT name, version, detected_usages, FIRST_USAGE_DATE, last_usage_date

  of DBA_FEATURE_USAGE_STATISTICS

  where upper (NAME) like '% % TUNING '.

• List of the SQL tuning sets without OEM

  Hello.

  I want to know what table is used to store the SQL tuning games/SQL tuning set names. I know that I can easily find the SQL tuning set OEM list, but I want to know about table/dynamic views.

  I Googled it but not able to find the table that stores the sql tuning set of tables.

  Thank you.

  B. Dave

  Try different words in google, I used and had to be included... in google...

  the value SQL tuning oracle dictionary tables

  Auto Tuning SQL

  • Information Advisor views, such as DBA_ADVISOR_TASKS , DBA_ADVISOR_EXECUTIONS , DBA_ADVISOR_FINDINGS , DBA_ADVISOR_RECOMMENDATIONS , and DBA_ADVISOR_RATIONALE views.
  • SQL tuning views of information, such as DBA_SQLTUNE_STATISTICS , DBA_SQLTUNE_BINDS , and DBA_SQLTUNE_PLANS views.
  • SQL Tuning Set views, such as DBA_SQLSET , DBA_SQLSET_BINDS , DBA_SQLSET_STATEMENTS , and DBA_SQLSET_REFERENCES views.
  • Information about captured execution plans for statements in SQL Tuning sets are displayed in the DBA_SQLSET_PLANS and USER_SQLSET_PLANS views.
  • SQL profile information is displayed in the DBA_SQL_PROFILES view. The TYPE parameter indicates if the SQL profile has been created manually by the SQL Setup Assistant (if TYPE = MANUAL ) or automatically by the auto tuning SQL (if TYPE = AUTO ).
  • Progress of enforcement Advisor information are displayed in the V$ADVISOR_PROGRESS view.