forcing the use of an index

Similar Questions

• I know how to force the Spotlight for re - index a drive or a folder. But how then do I mail?

  I know how to force the Spotlight for re - index a drive or a folder.

  But how then do I mail? I drag this file to the window?

  Thank you.

  Try re-indexing of mailboxes mailbox. This can take some time if you have a lot of mail.

  Reindex messages           For El Capitan, try looking in V3.

  Reindex messages (2)        See post by Linc Davis

• Force the use of the index without advice

  Dear all,
  
  I'm a newbie in the world of oracle.
  
  I HAD POSTED THIS SAME QUESTION IN SQL AND PLSQL CATEGORY, but thought that I had posted in a wrong category, so I post the same question again here.
  
  Recently my boss asked me a question about the use of the index.
  
  He wants to force the index to use if the optimizer chooses not to use it.
  
  But limitattion is this boat reach the query or the code because it is taken directly by an application that we can not change the code.
  
  So how is - a can force a query to use index without giving advice.
  
  It should be for a particular query, it should not apply for all indexes in the database.
  
  I know a parameter "OPTIMIZER_INDEX_COST_ADJ. If you set this parameter correctly, you can force the optimizer to use index. But it has its own limitations.
  
  So I want an alternative to this option which can only be applied to a particular query that is run without the use of indicators.
  
  Because this is my first thread, sorry if I made any mistake by posting the question
  
  Thank you all in advance
  
  Kind regards
  Navin Bandi

  Hello

  Have you tried the oracle outlines.

  Concerning
  Anurag

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  All the world fell on this and if so, have you found a solution?

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• Firefox OSX 10.7.5 25.0.1 forces the use of default input source, why?

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• force the use of an external gps receiver

  I can force my rx5940 to use an external gps for tomtom navi and/or any other program installed navi

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  Brian

  exactly what I needed thank you will try

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• Question about the use of secondary indexes in application

  Hi, I'm a newbie to Berkeley DB. We use Berkeley DB for our application that has tables in the following structure.
  
  Key to value1 value2
  ------- --------- ----------
  1) E_ID-> E_Attr, A_ID - where A_ID is String for example. A_ID = A1; A2; A3
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  Another question, lets say we have two tables
  
  Key to value1 value2
  ------- --------- ----------
  2) X_ID-> X_Attr, E_ID
  
  E_ID-> E_Attr, A_ID - where A_ID is String for example. A_ID = A1; A2; A3
  
  In this case, can create us E_ID as a secondary Index but with primary Table-> E_Attr, A_ID E_ID?
  
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  Don't know if its possible.
  
  Thanks for reading.

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• To force the index

  Hello
  
  My DB is 10.2.0.4
  
  I have a HISTORY table that has 4 million documents.
  I have a query which gives 15 lines out of it.
  Index is exactly on the same columns as the where clause.
  My = ALL_ROWS optimizer_mode
  
  I had read "complete analyses are NOT ALWAYS evil, indexes are NOT ALWAYS good.
  But is it possible to force the query to use the indexes here?
  

   
  CREATE INDEX history_idx3
    ON history (
      ACCNR,
      ACCERGNR,
      CUSTNR
    )
    STORAGE (
      INITIAL  241664 K
    )
  /
  
  
  SQL> SELECT * FROM HISTORY
  WHERE ACCNR = 1500003
  AND ACCERGNR = 0
  AND CUSTNR = 230530  2    3    4  ;
  
  15 ROWS SELECTED.
  
  ELAPSED: 00:03:41.00
  
  EXECUTION PLAN
  ----------------------------------------------------------
  PLAN HASH VALUE: 3565408272
  
  ------------------------------------------------------------------------------
  | ID  | OPERATION         | NAME     | ROWS  | BYTES | COST (%CPU)| TIME     |
  ------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT  |          |     1 |   200 | 93050   (2)| 00:18:37 |
  |*  1 |  TABLE ACCESS FULL| HISTORY |     1 |   200 | 93050   (2)| 00:18:37 |
  ------------------------------------------------------------------------------
  
  PREDICATE INFORMATION (IDENTIFIED BY OPERATION ID):
  ---------------------------------------------------
  
     1 - FILTER("CUSTNR"=230530 AND "ACCERGNR"=0 AND
                TO_NUMBER("ACCNR")=1500003)
  
  
  STATISTICS
  ----------------------------------------------------------
            1  RECURSIVE CALLS
            0  DB BLOCK GETS
       420095  CONSISTENT GETS
       418614  PHYSICAL READS
            0  REDO SIZE
         6266  BYTES SENT VIA SQL*NET TO CLIENT
          492  BYTES RECEIVED VIA SQL*NET FROM CLIENT
            2  SQL*NET ROUNDTRIPS TO/FROM CLIENT
            0  SORTS (MEMORY)
            0  SORTS (DISK)
           15  ROWS PROCESSED

  seems to be ACCNR in the table BACKGROUND is defined as VARCHAR?
  If so, your index is ignored.

  Try this:

  SELECT * FROM HISTORY
  WHERE ACCNR = '1500003'
  AND ACCERGNR = 0
  AND CUSTNR = 230530                                                                                                                                                                                                                                                                                                                                                                                                        
  

• How to force the screen sharing to use Ethernet 2 port?

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• Satellite C55 - how to force the games to use gforce GPU?

  Hello

  It seems that I have 2 graphics cards on my Satellite C55: a 4000 Intel and a gforce 740 m. I tried to force the games to use the gforce on Panel nvidia configuration, but in the games settings (for example in the Hardware tab of flight simulator 2004), shows only the Intel.

  No idea how to resolve this?

  Thank you

  > it seems that I have 2 graphics cards on my Satellite C55: a 4000 Intel and a gforce 740 m.

  The Intel GPU is part of the Intel
  The nVidia GeForce is the external graphics card and it can be used for the application of strong performance as games

  Check these youtube videos how to do this:
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  https://www.YouTube.com/watch?v=Zh4HCadTY_A

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  2. double-click on the NVIDIA Control Panel.
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• Why the feature multiple column indexes using index skip scan?

  Hi all

  I have just been hired by a new company and I explored its database infrastructure. Interestingly, I see several function based indexed column used for all the tables. I found it strange, but they said ' we use Axapta to connect Axapta with Oracle, function index according to should be used to improve performance. Therefore, our DBAs create several indexes of feature based for each table in the database. "Unfortunately, I can not judge their business logic.

  My question is, I just created similar to my local database tables in order to understand the behavior of the function index according to several columns. In order to create indexes of based function (substr and nls_lower), I have to declare the columns as varchars2. Because in my business our DBAs had created a number of columns as a varchar2 data type. I created two excatly same table for my experience. I create miltiple function according to index on the my_first table, and then I create several normal index on the my_sec table. The interesting thing is, index skip scan cannot be performed on more than one basic function index (table my_first). However, it can be performed to normal several index on my_sec table. I hope that I have to express myself clearly.

  Note: I also ask the logic of the rule function based index, they said when they index a column they don't ((column length) * 2 + 1) formula. For example, I want to create indexes on the zip code column, column data type VARCHAR2 (3), so I have to use 3 * 2 + 1 = 7, (substr (nls_lower (areacode), 1, 7). substr (nls_lower ()) notation is used nested for any function function index. I know that these things are very illogical, but they told me, they use this type of implementation for Axapta.

  Anyway, in this thread, my question is reletad to function function with index index skip scan, not logical bussiness, because I can not change the business logic.

  Also, can you please give hints or clues for multiple function based indexes?

  Thanks for your help.

  
  SQL > create table my_first as select '201' codeZone, to_char (100 + rownum) account_num, dbms_random.st
  Ring name ('A', 10) from dual connect by level < = 5000;

  Table created.

  SQL > create table my_sec as select '201' codeZone, to_char (100 + rownum) account_num, dbms_random.st

  Ring name ('A', 10) from dual connect by level < = 5000;

  Table created.

  SQL > alter table my_first change account_num varchar2 (12);

  Modified table.

  
  SQL > alter table my_sec change account_num varchar2 (12);

  Modified table.

  SQL > alter table my_first change codeZone VARCHAR2 (3);

  Modified table.

  SQL > alter table my_sec change codeZone VARCHAR2 (3);

  Modified table.

  SQL > create index my_first_i on my_first (substr (nls_lower (areacode), 1, 7), substr (nls_lower (account_num), 1, 15));

  The index is created.

  SQL > create index my_sec_i on my_sec (area code, account_num);

  The index is created.

  SQL > analyze table my_first computing statistics for all columns indexed for all indexes.

  Parsed table.

  SQL > analyze table my_sec computing statistics for all columns indexed for all indexes.

  Parsed table.

  SQL > exec dbms_stats.gather_table_stats (USER, 'MY_FIRST');

  PL/SQL procedure successfully completed.

  SQL > exec dbms_stats.gather_table_stats (USER, 'MY_SEC');

  PL/SQL procedure successfully completed.

  SQL > my_first desc;
  Name                                      Null?    Type
  ----------------------------------------- -------- ----------------------------
  CODEZONE VARCHAR2 (3)
  ACCOUNT_NUM VARCHAR2 (12)
  NAME VARCHAR2 (4000)

  SQL > desc my_sec
  Name                                      Null?    Type
  ----------------------------------------- -------- ----------------------------
  CODEZONE VARCHAR2 (3)
  ACCOUNT_NUM VARCHAR2 (12)
  NAME VARCHAR2 (4000)

  SQL > select * from my_sec where account_num = '4000';

  
  Execution plan
  ----------------------------------------------------------
  Hash value of plan: 1838048852

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

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

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

  |   0 | SELECT STATEMENT |          |     1.    19.     3 (0) | 00
  : 00:01 |

  |   1.  TABLE ACCESS BY INDEX ROWID | MY_SEC |     1.    19.     3 (0) | 00
  : 00:01 |

  |*  2 |   INDEX SKIP SCAN | MY_SEC_I |     1.       |     2 (0) | 00
  : 00:01 |

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

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

  2 - access ("ACCOUNT_NUM" = '4000')
  Filter ("ACCOUNT_NUM" = '4000')

  
  Statistics
  ----------------------------------------------------------
  1 recursive calls
  0 db block Gets
  Gets 7 compatible
  0 physical reads
  0 redo size
  543 bytes sent via SQL * Net to client
  384 bytes received via SQL * Net from client
  2 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  1 rows processed

  SQL > select * from my_first where substr (nls_lower (account_num), 1: 25) = '4000';

  
  Execution plan
  ----------------------------------------------------------
  Hash value of plan: 1110109060

  ------------------------------------------------------------------------------
  | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
  ------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT |          |     1.    20.     9 (12) | 00:00:01 |
  |*  1 |  TABLE ACCESS FULL | MY_FIRST |     1.    20.     9 (12) | 00:00:01 |
  ------------------------------------------------------------------------------

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

  1 Filter (SUBSTR (NLS_LOWER ("MY_FIRST". "" "" ACCOUNT_NUM")(, 1, 15) ="4000"
  AND SUBSTR (NLS_LOWER ("ACCOUNT_NUM"), 1, 25) = '4000')

  
  Statistics
  ----------------------------------------------------------
  15 recursive calls
  0 db block Gets
  Gets 26 consistent
  0 physical reads
  0 redo size
  543 bytes sent via SQL * Net to client
  384 bytes received via SQL * Net from client
  2 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  1 rows processed

  SQL > Select / * + INDEX_SS (MY_FIRST) * / * from my_first where substr (nls_lower (account_num), 1: 25) = '4000';

  
  Execution plan
  ----------------------------------------------------------
  Hash value of plan: 2466066660

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

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

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

  |   0 | SELECT STATEMENT |            |     1.    20.    17 (6) |
  00:00:01 |

  |*  1 |  TABLE ACCESS BY INDEX ROWID | MY_FIRST |     1.    20.    17 (6) |
  00:00:01 |

  |*  2 |   INDEX SCAN FULL | MY_FIRST_I |     1.       |    16 (7) |
  00:00:01 |

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

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

  1 - filter (SUBSTR (NLS_LOWER ("ACCOUNT_NUM"), 1, 25) = '4000')
  2 - access (SUBSTR (NLS_LOWER ("ACCOUNT_NUM"), 1, 15) = '4000')
  Filter (substr (NLS_LOWER ("ACCOUNT_NUM"), 1, 15) = '4000')

  
  Statistics
  ----------------------------------------------------------
  15 recursive calls
  0 db block Gets
  857 consistent gets
  0 physical reads
  0 redo size
  543 bytes sent via SQL * Net to client
  384 bytes received via SQL * Net from client
  2 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  1 rows processed

  Check MoS for a bug with the FBI and Skip Scan - it sounds like it could be a bug.

  On 11.2.0.4 with your sample code 10053 trace shows the optimizer whereas an index FULL scan to the point where she should consider an index SKIP scan for "unique table path".

  A person with 12.1.0.1 practice would like to run your test and see if it's fixed in this version.

  Concerning

  Jonathan Lewis

• Force the VM to use the wired ethernet port instead of wireless

  Hello

  I use ver 9 workstation.  I have my host computer (win 7 64 bit) connected to our network of offices using the connection with wireless computers.

  I use a windows xp based virtual machine image that connects to devices of 3rd party via the ethernet port wired in Bridge mode.

  Is there a way to force the workstation on the use of only the cable connection and don't EVER try to connect via the wireless?

  At the moment I have to disable the wireless for the workstation to access cable port, if the without wire is activated, so you may not see anything on the wired port...

  It also causes headaches with ip address conflicts (3rd devices use the same IP range as our network of offices) if I don't have the VM running and wireless power.

  Any help or advice would be appreciated

  Tim

  Use the virtual network Editor to bind to the target adapter for VMnet0 and set the NIC of the virtual machine to use connected by a bridge.

• Why the data tablespace is used to rebuild indexes?

  11.2.0.3/RHEL 5.8
  
  We were doing a REBUILD of Index and we got the following error message. I was under the impression that temporary tablespace is used to index
  Reconstructions. But oracle used the tablespace intended to data (GTMLP_OAT_DATA) for reconstruction, as shown below. This is the expected behavior?
  

  SQL>   ALTER INDEX IDX_CSD_CLIENT_PROF REBUILD PARALLEL 6;
    ALTER INDEX IDX_CSD_CLIENT_PROF REBUILD PARALLEL 6
  
  ERROR at line 1:
  ORA-12801: error signaled in parallel query server P011, instance tandhwr199:HMKRAP2 (3)
  ORA-30032: the suspended (resumable) statement has timed out
  ORA-01652: unable to extend temp segment by 1024 in tablespace GTMLP_OAT_DATA

  -User is correctly assigned a temporary tbs

  SQL> select username, DEFAULT_TABLESPACE , TEMPORARY_TABLESPACE from dba_users where username = 'GTMLP_01';
  
  USERNAME                       DEFAULT_TABLESPACE             TEMPORARY_TABLESPACE
  ------------------------------ ------------------------------ ------------------------------
  GTMLP_01                    GTMLP_OAT_DATA                 GTMLP_TEMP

  It is true, GTMLP_OAT_DATA had actually run out of space.

  So is my hypothesis tha only temporary with is used for the Index rebuild is bad?

  Yes, your assumption is false. Temporary tablespace will be or could be used for sorting (large kinds) which is one of the steps in create index. Rest of the steps will be in the form of temporary to permanent tablespace segments. Here is your answer:

  Rebuilt indexes use temp or system tablespace tablespace?

• How to use CSS to force the page to full height?

  I'm trying to use CSS to force the content on the page to full height when the content is not long enough to do the job. After reading several articles on the Web, I put the html, body and articletest selectors at a height and min-height of 100%. But it does not work. The yellow area Brown/inner light should extend almost to the bottom, the the two final colors div should be at the bottom of the browser window...

  http://www.keithpurtell.com/kthings/Test01.htm

  You must make two changes as follows:

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  color: #31260F;
  font: 1em "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 0;
  Width: 100%;
  /*height:100%;*/
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  (2) change your CSS #main to look like this:

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  margin: 0 0 auto;
  Max-width: 1180px;
  min-width: 30em;
  min-height: 100%;
  overflow: hidden;
  position: relative ;}

  This should do the trick.  He made and tested it on my system.  I put the page online if need be!

  Good luck.