Different operator where condition using or not the index

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  Visit our Microsoft answers feedback Forum and let us know what you think.

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  CITY

• Shot summary of a where condition clause...

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  It is possible to create an element of the summary screen is based on the place where the condition
  
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  Published by: Chase Suhail on November 9, 2010 22:45

  Hello

  Create a column of formulas no database in the same block to say 'NON_ZERO.
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  3333333 f 05/01/09
  
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  Any suggestions?

  Use row_number(), not the max() to compare.

  with data as
  (
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  select 2222222 as id, 'b' as col2, to_date('02-JAN-09','dd-mon-yyyy') as the_date from dual union all
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  select 3333333 as id, 'f' as col2, to_date('05-JAN-09','dd-mon-yyyy') as the_date from dual
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  ID                     COL2 THE_DATE
  ---------------------- ---- -------------------------
  1111111                a    01-JAN-09
  2222222                d    04-JAN-09
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  ALTER INDEX REBUILD.

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  INDEX_NAME INDEX_TYPE                  STATUS   FUNCIDX_
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  X1_TMP_T1  FUNCTION-BASED NORMAL       VALID    ENABLED
  

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    2  RETURN VARCHAR2
    3  DETERMINISTIC
    4  IS
    5  BEGIN
    6    RETURN UPPER(p_string);
    7  END f1;
    8  /
  
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    2    FROM user_indexes;
  
  INDEX_NAME INDEX_TYPE                  STATUS   FUNCIDX_
  ---------- --------------------------- -------- --------
  X1_TMP_T1  FUNCTION-BASED NORMAL       VALID    ENABLED
  
  

  Should not be. Because of the function "create or replace" F1 never go through a "invalid" phase which may be necessary for index becomes unusable? What about queries on the TMP_T1 table? Does optimizer always uses access index or not? What about the results?

  SQL> EXPLAIN PLAN SET statement_id='s1' FOR
    2  SELECT a_string, f1(a_string) as f1_a_string, f1('a') as f1_literal
    3    FROM tmp_t1
    4   WHERE f1(a_string) = 'a';
  
  Explained.
  
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  PLAN_TABLE_OUTPUT                                                                                                   
  ------------------------------------------------------------------------------------------------------------------------
  Plan hash value: 3133804460                                                                                         
                                                                                                                      
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  -------------------------------------------------------------------------------------------------                   
  |   0 | SELECT STATEMENT                    |           |     1 |  2024 |     2   (0)| 00:00:01 |                   
  |   1 |  TABLE ACCESS BY INDEX ROWID BATCHED| TMP_T1    |     1 |  2024 |     2   (0)| 00:00:01 |                   
  |*  2 |   INDEX RANGE SCAN                  | X1_TMP_T1 |     1 |       |     1   (0)| 00:00:01 |                   
  -------------------------------------------------------------------------------------------------
  

  The index is used by the optimizer, see the results.

  SQL> column f1_a_string format a15;
  SQL> column f1_literal format a15;
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    2    FROM tmp_t1
    3   WHERE f1(a_string) = 'a';
  
  A_STRING   F1_A_STRING     F1_LITERAL
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  a          a               A
  

  A_STRING = value in the table

  F1_A_STRING = value of f1 (a_string) but the value is not evaluated because it comes from an index, so tiny value (remember, at the time index created the function returned small values)

  F1_LITERAL = value of the function f1 newly evaluated, using literal instead of the value in the table.

  Predicate f1 (a_string) = 'a' should return no rows because no character uppercase is equivalent to "a". Query with f1 (a_string) = 'A' should return a line, but it doesn't.

  SQL> SELECT a_string, f1(a_string) as f1_a_string, f1('a') as f1_literal
    2    FROM tmp_t1
    3   WHERE f1(a_string) = 'A';
  
  no rows selected
  

  Anyone know if this is an expected behavior? And, is it possible to disable the index based on a function whenever the underlying function signature is changed? The parameter query_rewrite_integrity = applied from

  DOC-ID 66277.1 does not seem to do the trick:

  (c) session variables

  ~~~~~~~~~~~~~~~~~~~~

  QUERY_REWRITE_ENABLED (true, false),

  QUERY_REWRITE_INTEGRITY (confidence, forced, stale_tolerated)

  determines the optimizer to use index based on a function with

  expressions using SQL, user defined functions functions.

  TRUST: Oracle allows rewrites using relationships that have

  was declared.

  APPLIED: Oracle ensures and guarantees consistency and integrity.

  STALE_TOLERATED: Oracle allows rewrites using vessels of the relationship not applied.

  Used in the case of materialized views.

  Set session variable cost function optimizer to choose the

  a function-based index

  Kind regards

  SAMO

  From the Manual 11.2 ( https://docs.oracle.com/cd/E11882_01/appdev.112/e41502/adfns_indexes.htm#ADFNS254 )

  "If you change the semantics of a DETERMINISTIC run and recompile, then you must manually rebuild all addicts depending on index and materialized views." Otherwise, they report results for the previous version of the function. »

  This note is not that I made my initial comment well - which was based on an incorrect memory the relationship between function-oriented and autonomous pl/sql functions, so I won't try to explain it. In fact, I went back to Oracle 8i practice to see if something had changed between yesterday and today and found that I had described exactly the behavior that the OP has been seeing. It's the way it is supposed to be.

  Concerning

  Jonathan Lewis

• How the index data are managed within the cluster?

  Hello
  
  We are evaluating the consistency.
  
  Regarding indexes, am I right in thinking that the data in the index are stored in a (managed internally) cache on the same node that the attendant at the following indexed values? I'm not interested in getting the data in the index, but rather just to understand how the data in the index itself are stored or processed within the cluster.
  
  So in a 2 cluster node where an index is applied to a distributed cache that has only 2 entries, will there be a key cache on each node 1 {binary,} to enter key where the key points to the value that is stored on this same node? In other words, I'm sure that the index data to be spread out in the cluster in the case of a partitioned topology?
  
  Concerning
  Peter

  user11279467 wrote:
  Hello

  We are evaluating the consistency.

  Regarding indexes, am I right in thinking that the data in the index are stored in a (managed internally) cache on the same node that the attendant at the following indexed values? I'm not interested in getting the data in the index, but rather just to understand how the data in the index itself are stored or processed within the cluster.

  So in a 2 cluster node where an index is applied to a distributed cache that has only 2 entries, will there be a key cache on each node 1 {binary,} to enter key where the key points to the value that is stored on this same node? In other words, I'm sure that the index data to be spread out in the cluster in the case of a partitioned topology?

  Concerning
  Peter

  Hi Peter,.

  up to 3.4.x index have been supported only on partitioned topology, and Yes, the index on each node contain only the data corresponding to the entries that have their main copy on this node (referred to as entered local subsequently).

  The indexes are not stored in a cache, but they are managed under the information that maintains consistency in terms of backup (the map that contains local entries).

  The indexes are in 2 parts:

  -index to the front: this is a mapping of the cache key in an internal representation (Playback key card in the future) the value extracted with the extractor used to create the index of the entry to membership of the cache key (value extracted later)

  -reverse index (aka. reversed card): this is a map of the value extracted from a backup set of the keys of the map of entries which we extract the index key reversed with the extractor used to create the index

  The index can be sorted, which means that the index reversed a SortedMap (sort order is the order of the extracted values)

  Let's see an example. Assuming you have the contents of the following cache within a particular extension storage node:

  A--> Object (PositionX = 5,...)
  B--> object (getA = 3,...)
  C--> object (getA = 3,...)
  D--> object (getA = 4,...)

  The index forward in this node will contain:

  Binary (A)--> 5
  Binary (B)--> 3
  Binary (C)--> 3
  Binary (D)--> 4

  The reverse index will contain:

  3--> {Binary (B), Binary (C)}
  4--> {Binary (D)}
  5--> {Binary (A)}

  Where Binary (...) designates the internal representation (binary) of the... object.

  If the index is not ordered, then the order of iteration over the entries in the index reversed are not deterministic.

  If the index is ordered, the iteration of the entries into the inverted index will be as stated above. Also, you can convert the SortedMap inverted index in order to have the very useful headMap and tailMap and firstKey and lastKey methods.

  I hope this helps.

  Best regards

  Robert

• Case where the Condition when Clause Condition use

  Hello
  
  How can I use case in the where condition and in when I need to use a condition, be clearly
  I need to get the following

  and (case WHEN :PROMT = 'Closed' then
   status_date >= trunc(sysdate))  end)

  When I run the present, I'm missing keyword error.
  
  How can I solve this?

  I think you can do it just like this:

  ...
  and ( :PROMPT != 'Closed' or status_date >= trunc(sysdate) )
  ...
  

• Why can't I not move the button reload at left where it used to be?

  I have used firefox since the dawn of time and have many ingrained habits, such as moving the mouse to the top left next to the House and "back" button to find refill. Now, it is oddly locked to the right of the URL bar. When will this be fixed? I read "solutions" involving downgrade firefox or some plugin/addon/tirepatch - but I'm waiting for a real solution. At this point, the chrome is the best option.

  You know, the Restorer Classic theme that solves it for me. In contrast to my experience in the past when installing an addon was rocket science, it's trivially easy and less than a minute, I have a button reload where I want (so my old habits may find it). I always plead for what actually an attribute of 'tunable' native interface for firefox. Indeed there is now a redundant reload button where firefox insists he, but I can live with that. So thank you, this removes indeed the main source of nuisance.