When we use a unique index for PK?

Similar Questions

• (ORA-00955) conflict of naming for index and constraint when you use a unique index (.. desc,.. CSA)

  Hello

  indexes and constraints are in different namespaces, so it should be possible to give them the same name.

  In the following case that apparently does not work:
  

  create unique index orders_year_show_uq
    on orders (year desc, show_orders asc);
   
   alter table orders
    add constraint orders_year_show_uq unique (year, show_order);
  

  When I run these statement, I get a "SQL Error: ORA-00955: name is already used by an existing object". ""

  If I clean and I execute the same instructions as above with the only difference on the 2 line, using "asc year" instead of "year desc":

  
    on orders (year asc, show_orders asc);
  

  then it success.

  I can't explain it, you have an idea?

  Thanks in advance.

  Kind regards

  Giovanni

  First of all, you have show_orders in index and show_order in the constraint. I'll assume that it's a typo. Second, when you create constraint without index enhance the specification Oracle seeks indexes existing on the same set of columns in ascending order. If this index does not exist (and it's your case, since one of your columns to index is in descending order), Oracle tries to create one with the same name as the constraint. That's why you get ORA-00955: name is already used by an existing object. In general, you can specify explicitly the index name to force the Oracle by using the existing index. But it will not help you. If you issue

  ALTER table orders add unique constraint (year, show_orders) orders_year_show_uq using index orders_year_show_uq;

  You will get the ORA-14196: specified index cannot be used to apply the constraint.

  In any case, Oracle does not support using index DESC for PK/UK.

  SY.

• CC 2015 Illustrator crashes when you use the function "save for Web".

  CC 2015 Illustrator crashes when you use the function "save for Web".

  Hello

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• How to get LR using a unique name for each file?

  Hey there,

  I see that LR does not change the name of the file when there is already a file with the same name in the import file, but once you choose another folder it does not matter the file with the original name. I just realized that over the years using folders such as photos 2009 Photos 2010 and so forth, I have three or four times the files with the same name. Is there a way to tell LR to always use unique names when importing?

  Use a naming date-description model - sequence.ext to rename as you import (or if you prefer after importation). This means that you have never duplicates unless you for some weird reason use the same description for two sets of files on the same day. And if you need to do exactly that, just the starting number of the second/third batch of files be a number greater than previous batch on the same day.

  You can configure what ever format naming you want in file rename dialogue and have as a default.

  Leaving the file names as they come out of the device application in big trouble as invariably they're going to duplicate, which is not an even if good idea in different folders.

  F2 to rename the dialog when in the library.

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  Recently, I upgraded my wife to a new pc with Windows 7 Home Premium on it.  The package of trancription she uses is WinScribe.  For knowledge, we kept his old Office XP with Word 2002.  After the IT person to society that it contracts for all their software set up and install a spell checker medical all seems to work well.  Well now, we just have a question.  She uses and uses an Infinity IN-USB-2 foot controller.  The question is when it plays its reports, intermittently when it leaves upward on the pedal to play that the report continues to play.  We have installed a new pedal, always with the same problem.  These controllers do not come with a dedicated driver, but are recognized by Windows.  Don't know if it's a problem of Windows 7 or not, but before, it was to use Windows XP with the same transcription software, the same product office and same foot controller without problem.  As a side note, my reason to replace his old computer was XP got to where she acted as if she had alzhiemers.  Has raced in many analyses of virus and malware scans with various products.  No permit.  Has happened to another pc, I have too.  Anyone who deals with this?

  Hello Larry,.

  Thanks for posting of query in Microsoft Community.

   
  I suggest you to contact Infinity IN-USB-2 feet and check with them.
  http://www.Data-supplies.com/infinity-in-USB-2-foot-pedal/
  Support by email
  http://www.dictationsupport.co.uk/email-support/
   
  Hope the helps of information.
   
  Thank you

• Why choose wrong explain plan when there is a unique index

  SQL > create table test in select * from dba_objects;
  
  Table created.
  
  SQL > create table test1 in select * from user_objects;
  
  Table created.
  
  SQL > create index unique i_test_1 on test (object_id);
  
  The index is created.
  
  SQL > exec dbms_stats.gather_table_stats (user, 'TEST');
  
  PL/SQL procedure successfully completed.
  
  SQL > exec dbms_stats.gather_table_stats (user, 'TEST1');
  
  PL/SQL procedure successfully completed.
  
  SQL > set autot trace
  SQL > select test1.* from test, test1 where test.object_id = test1.object_id;
  
  23037 selected lines.
  
  
  Execution plan
  ----------------------------------------------------------
  Hash value of plan: 3995284093
  
  -------------------------------------------------------------------------------
  | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
  -------------------------------------------------------------------------------
  | 0 | SELECT STATEMENT | 23038 | 2114K | 77 (12) | 00:00:01 |
  | 1. NESTED LOOPS | 23038 | 2114K | 77 (12) | 00:00:01 |
  | 2. TABLE ACCESS FULL | TEST1 | 23038 | 2002K | 70 (3) | 00:00:01 |
  |* 3 | INDEX UNIQUE SCAN | I_TEST_1 | 1. 5. 0 (0) | 00:00:01 |
  -------------------------------------------------------------------------------
  
  Information of predicates (identified by the operation identity card):
  ---------------------------------------------------
  
  3 - access("TEST".") OBJECT_ID '= 'TEST1'.' OBJECT_ID')
  
  
  Statistics
  ----------------------------------------------------------
  494 recursive calls
  0 db block Gets
  26457 consistent gets
  0 physical reads
  0 redo size
  1090589 bytes sent via SQL * Net to client
  17270 bytes received via SQL * Net from client
  1537 SQL * Net back and forth to and from the client
  5 kinds (memory)
  0 sorts (disk)
  23037 rows processed
  
  
  SQL > drop index i_test_1;
  
  The index is deleted.
  
  SQL > create index i_test_1 on test (object_id);
  
  The index is created.
  
  SQL > set autot trace
  SQL > select test1.* from test, test1 where test.object_id = test1.object_id;
  
  23037 selected lines.
  
  
  Execution plan
  ----------------------------------------------------------
  Hash value of plan: 845425162
  
  --------------------------------------------------------------------------------
  --
  
  | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time
  |
  
  --------------------------------------------------------------------------------
  --
  
  | 0 | SELECT STATEMENT | 23038 | 2114K | 99 (6) | 00:00:02
  |
  
  |* 1 | HASH JOIN | 23038 | 2114K | 99 (6) | 00:00:02
  |
  
  | 2. FULL RESTRICTED INDEX SCAN FAST | I_TEST_1 | 49887 | 243K | 27 (4) | 00:00:01
  |
  
  | 3. TABLE ACCESS FULL | TEST1 | 23038 | 2002K | 70 (3) | 00:00:01
  |
  
  --------------------------------------------------------------------------------
  --
  
  
  Information of predicates (identified by the operation identity card):
  ---------------------------------------------------
  
  1 - access("TEST".") OBJECT_ID '= 'TEST1'.' OBJECT_ID')
  
  
  Statistics
  ----------------------------------------------------------
  1 recursive calls
  0 db block Gets
  1936 complies
  411 physical reads
  0 redo size
  1090589 bytes sent via SQL * Net to client
  17270 bytes received via SQL * Net from client
  1537 SQL * Net back and forth to and from the client
  0 sorts (memory)
  0 sorts (disk)
  23037 rows processed
  
  I think the hash join is the real plan, why choose nest loop where there is a unique index.

  Jinyu wrote:
  I think that thought cbo cost single scan index is 0, so loop nest is less expensive than the hash join, but I do not know why here costs 0

  Jinyu,

  You are right - in a nested loop, the CBO gives unique access by unique index value slightly cheaper than the same access by a non-unique index--essentially subtracting 1 of the normal cost.

  It is one of the reasons why you only need to create a no unique index to support a unique constraint, if you have a very good reason - if you modify a unique index that is not unique, change of costs and execution of some paths may change.

  Concerning
  Jonathan Lewis

• explain query plan uses no unique index with where condition

  Hi all

  I use in the 10.2.0.5 oracle database Enterprise edition 64-bit on 64-bit windows server 2008.

  I'm following this tutorial on my own table

  Guide to understanding Oracle QUERY PLAN - 10 minutes

  my questions are below

  Analyze table LIB_CLASSIFICATIONS compute statistics;
  explain plan for  SELECT class_id  FROM lib_classifications WHERE class_no = '538' ;
  select * from table(dbms_xplan.display);
  

  the result is less than

  Hash value of plan: 3022072076

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

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

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

  |   0 | SELECT STATEMENT |                     |     1.    10.     5 (0) | 00:00:01 |

  |*  1 |  TABLE ACCESS FULL | LIB_CLASSIFICATIONS |     1.    10.     5 (0) | 00:00:01 |

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

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

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

  1 - filter ("CLASS_NO" = '538')

  DESC LIB_CLASSIFICATIONS

  Name of Type Null

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

  CLASS_ID NOT NULL NUMBER (10)

  CLASS_DESC VARCHAR2 (50)

  REMARKS VARCHAR2 (250)

  CLASS_NO VARCHAR2 (20)

  CLASS_TYPE VARCHAR2 (10)

  CREATE_USER VARCHAR2 (10)

  MODIFY_USER VARCHAR2 (10)

  CREATE_DATE DATE

  MODIFY_DATE DATE

  CLASS_CATEGORY_ID VARCHAR2 (10)

  class_id has a primary key.

  now when I remove the condition where the query, the result is lower;

  Analyze table LIB_CLASSIFICATIONS compute statistics;
  explain plan for  SELECT class_id  FROM lib_classifications ;
  select * from table(dbms_xplan.display);
  

  the result is less than

  Hash value of plan: 262704430

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

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

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

  |   0 | SELECT STATEMENT |             |  1558.  6232.     2 (0) | 00:00:01 |

  |   1.  FULL RESTRICTED INDEX SCAN FAST | SYS_C005653 |  1558.  6232.     2 (0) | 00:00:01 |

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

  now it's using indexes with INDEX FAST FULL SCAN.

  I need the index using the WHERE condition as well.

  How to do this?

  Thank you.

  you have indexes on the column class_id not on class_no column how u would expect index to use when there is no index on the column class_no

• unique index for several columns

  Hi all
  
  We have a requirement for our application, to add a single search box, which searches more than 1 table of different columns. The way in which we have now implemented, is the following (simplified example):
  Select *.
  WCP
  where instr(ename,:SEARCH) > 0
  or instr(job,:SEARCH) > 0
  or...
  
  This approach is relatively slow, of course. I want to change it, using the text of the Oracle. Can you give me advice what kind of index, must be used? Our requirement:
  -index must continue to be up-to-date (a few seconds)
  -research must be
  -case insensitive preference
  -number of columns to be indexed: aprox. 20 in a table
  
  I heard once you can make a function, with all the columns you want to index. This function generates an xml document, and you can use this function to create an Oracle text index. However, I can't seem to find how I can implement that. Or is there a better aproach?
  
  Thanks again for your help!

  You can use a multi_column_datastore, that generates xml documents as you describe in the scenes. You can also use the transactional option or sync (on validation) with optimization. See the simplified example with only two columns below that matches what you provided. You can find further information and examples for the multi_column_datastore in the online documentation.

  SCOTT@orcl_11gR2> begin
    2    ctx_ddl.create_preference ('emp_ds', 'multi_column_datastore');
    3    ctx_ddl.set_attribute ('emp_ds', 'columns', 'ename, job');
    4  end;
    5  /
  
  PL/SQL procedure successfully completed.
  
  SCOTT@orcl_11gR2> alter table emp add (any_column varchar2(1))
    2  /
  
  Table altered.
  
  SCOTT@orcl_11gR2> create index emp_idx
    2  on emp (any_column)
    3  indextype is ctxsys.context
    4  parameters
    5    ('datastore emp_ds
    6        transactional')
    7  /
  
  Index created.
  
  SCOTT@orcl_11gR2> variable search varchar2(100)
  SCOTT@orcl_11gR2> exec :search := 'CLARK'
  
  PL/SQL procedure successfully completed.
  
  SCOTT@orcl_11gR2> select ename, job from emp
    2  where  contains (any_column, :search) > 0
    3  /
  
  ENAME      JOB
  ---------- ---------
  CLARK      MANAGER
  
  1 row selected.
  
  SCOTT@orcl_11gR2> exec :search := 'CLERK'
  
  PL/SQL procedure successfully completed.
  
  SCOTT@orcl_11gR2> select ename, job from emp
    2  where  contains (any_column, :search) > 0
    3  /
  
  ENAME      JOB
  ---------- ---------
  SMITH      CLERK
  ADAMS      CLERK
  JAMES      CLERK
  MILLER     CLERK
  
  4 rows selected.
  

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  We run a small business with a team of 10 people. I need 5 licenses of creative cloud. Now, cloud creative teams is more expensive and has more features that I don't need (such as the deployment of the license, 100 GB cloud storage etc.).

  I just though that, if I could buy individual 5 licenses and use it to people on my team. It will work or not.

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  Hello
  
  jdev version - 11.1.2.1.0
  
  
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• Transform a no Unique Index in a single index

  Hello

  Version: 11.2.0.4.0 Enterprise Edition

  We got a non-unique Index for a primary key constraint. I would like to change that in a unique index. I know that you can not change the index to change. Is the only way to disable the primary key, delete the index and re-enable the constraint or is there a better solution? It is a 24/7 platform.

  sql_colder

  Windows service exist for a reason.

  You can also create clues online in an operational database.

  There is no other method outside the use of DBMS_REDEFINITION.

  Think about it: what is the business case to change the index?

  -----------

  Sybrand Bakker

  Senior Oracle DBA