Why index has a greater than its table dimension

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• Index bitmap for FKs on fact tables

  Hi all
  
  We have a database of DWH (Star Dimesions and the tables schema) running with OBIEE 11 g (11.1.1.1.6) on the oracle 11 g (11.2.0.1) database. I read in one of the best practical paper, creating index Bitmap on the Fks of all fact tables will help performance.
  
  I created indexes for the less than 2500 separate keys, but we have 2 dimesions tables where there are great number of records (size 14 g and 10 g). Can I go ahead and create indexes of bitmap for 2 tables establishments (mainly account_key and customer_keys are the columns)?
  
  Worried about creating index bitmap for large tables where they could affect the ETL process.
  
  Ref: http://www.oracle.com/technetwork/database/bi-datawarehousing/twp-dw-best-practies-11g11-2008-09-132076.pdf (page 20)
  
  Help, please.
  
  Thank you and best regards,
  Anand.

  >
  I created indexes for the less than 2500 separate keys, but we have 2 dimesions tables where there are great number of records (size 14 g and 10 g). Can I go ahead and create indexes of bitmap for 2 tables as well
  . . .
  Worried about creating index bitmap for large tables where they could affect the ETL process.
  >
  You put the cart before the horse!

  Don't create index unless you have a reason documented for them.

  Why did you choose the index bitmap for cardinality less than 2500? Perhaps based on a long-standing myth, but discredited on the cardinality?

  See also Richard Foote two articles where he explodes the myths about bitmap indexes and considerations of cardinality
  http://richardfoote.WordPress.com/2010/02/18/myth-bitmap-indexes-with-high-distinct-columns-blow-out/
  http://richardfoote.WordPress.com/2010/03/03/1196/

  Re your concern about the tables with the 'large' number of records and affecting ETL.

  You are right to be concerned about these issues, but you need to document your particular situation taking into account the architecture.

  The fact tables and dimension tables can have a large number of records. If using the bitmap index is indicated, then the most records are most effective, they will be.

  ETL is affected because the DML (INSERT, UPDATE, DELETE) operations on the tables with bitmap indexes can have serious performance because of the involved serialization issues. Updated single bitmap of a column value (e.g., am ' to 'F' gender) requires that the two index bitmap blocks must be blocked until the update is complete. An index of stored bitmap ranges ROWID (rowid min - max rowid) that can span many, many files. The "range" of ROWID is locked in order to change a value.

  To change: 'follow her' rowid beach so that a row is locked and ID should be removed from the range by turning off the bit. Change to the 'F', the rowid id range 'F' must be found, locked and the bit set that corresponds to this rowid. No another row with ROWID in the range cannot be changed, because it is a transaction in the series. If the range includes 1000 lines and they all need changed it takes 1000 series.

  For anything other that a very small number of documents the bitmap index would be deleted and rebuilt after the ETL operations. That is why the data warehouse designs try to minimize update and implement insertions and deletions using partitioning when possible; Adding a new day by adding a new partition.

  There is also a big difference between a bitmap index and a bitmap join index. The white paper you quoted does not really indicate what type are used or recommended.

  Learn more about the difference - see Using Bitmap indexes in data warehouses in the doc of Data Warehousing
  http://docs.Oracle.com/CD/B28359_01/server.111/b28313/indexes.htm

• Increment Dt start with day greater than the Dt at the end of the year Prev in Pro * C

  Morning people and greetings from Toronto.
  
  I'm trying to change a Pro * C program. Since ages I touched a Pro * C program but I have made an attempt for her. I would probably need some help andhopefully is the right forum I could nto seem to find any section decicated Pro * C programs.
  
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  ------------------------------------------------------------------------------------------------
  999999     Mary Poppins      2009         03-May-2009      08-May-2010

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  Here is my ProC program in hand
  

  /* Include Headers */
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <ctype.h>
  #include <math.h>
  ---------------------------
  /* Define constants */
  ---------------------------
  #define  nullterm(string) string.arr[string.len] = '\0';
  /* SQL Host Variables */
  exec sql begin declare section;
  exec sql include sqlca;
  
   varchar   ctrl_start_date[11];
   short     ctrl_start_date_ind;
   varchar   ctrl_end_date[11];
   short     ctrl_end_date_ind;
  
   varchar   end_date[11];
   short     end_date_ind;
  
   int       exist_end_date_flag;
   short     exist_end_date_flag_ind;
  
  exec sql end declare section;
  
  
  /* Function Prototypes */
  
  void check_date_overlap();
  
  
  void main(int argc, char *argv[])
  {
  /* Coding starts here */
  
  void get_ctrl_dates()
  {
   exec sql
    select  to_char(trunc(ctrl_start_date),'YYYY/MM/DD'),
            to_char(trunc(ctrl_end_date),'YYYY/MM/DD')
    into    :ctrl_start_date :ctrl_start_date_ind,
            :ctrl_end_date  :ctrl_end_date_ind
    from    control_tb
    where   current_yyyy = :year_number;
  }
  
     check_date_overlap();
  
     if (strcmp( (char *)run_mode.arr,"N")==0)
     {
      check_date_overlap();
      create_person_rec(); /* This will insert record into person_tb table */
     }
  }
  
  /***********************/
  /* CHECK_DATE_OVERLAP  */ 
  /***********************/
  void check_date_overlap()
  {
  
   exist_end_date_flag = 0; /* assume he does not have a record */
  
   exec sql
    select count(*), end_date + 1
    into   :exist_end_date_flag exist_end_date_flag_ind,
           :end_date :end_date_ind
    from   person_tb
    where  doc_id = :doc_id
    and (( :ctrl_start_date between start_date  and end_date ) or
         ( :ctrl_end_date   between start_date  and end_date ) or
         ( start_date between :ctrl_start_date  and :ctrl_end_date ) or
         ( end_date   between :ctrl_start_date  and :ctrl_end_date ))
    and    year_number = (:year_number - 1)
    group by end_date
    having count(*) = 1;
  
    /*** Error Check Routine goes in here ***/
  
    /* Overlapping of dates; Set the Start Date equal End Date + 1 to avoid overlap */
    if (exist_end_date_flag == 1)
    {
     print_to_err_file("The Start Date is overlapping with a previous period.",0);
    }
  
     nullterm(end_date);
  
  } /* check_date_overlap */

  Here would be my question:
  
  My question is, should the SQL above be written like this instead?

  /***********************/
  /* CHECK_DATE_OVERLAP  */ 
  /***********************/
  void check_date_overlap()
  {
  
   exist_end_date_flag = 0; /* assume he does not have a record */
  
   exec sql
    select count(*), end_date
    into   :exist_end_date_flag exist_end_date_flag_ind,
           :end_date :end_date_ind
    from   person_tb
    where  doc_id = :doc_id
    and (( :ctrl_start_date between start_date  and end_date ) or
         ( :ctrl_end_date   between start_date  and end_date ) or
         ( start_date between :ctrl_start_date  and :ctrl_end_date ) or
         ( end_date   between :ctrl_start_date  and :ctrl_end_date ))
    and    year_number = (:year_number - 1)
    group by end_date;
  
    /*** Error Check Routine goes in here ***/
  
    /* Overlapping of dates; Set the Start Date equal End Date + 1 to avoid overlap */
    if (exist_end_date_flag == 1)
    {
      /* Is this even correct or would I have to do a strcpy?.
          Also note that I am overwriting ctrl_start_date which
          was fetched earlier in get_ctrl_dates() */
     ctrl_start_date = end_date + 1;
     print_to_err_file("The Start Date is overlapping with a previous period.",0);
    }
  
     nullterm(end_date);
  
  } /* check_date_overlap */

  Published by: Raj404261 on June 10, 2009 11:21

  You can put your code between the {code}

  As
  {code}
  your code...
  ...
  {code}

  SS

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  Hello

  I have to read a byte with a value greater than 127, Labview turn 27.

  In help I saw that Labview provides a description of ASCII that pour values ranging up to ' 127.

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  Hello

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  Rigid wrote:

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  Concerning

  Etbin

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  Clive

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  Hartmut cordially

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  Abel Souza

  Engineering applications

  National Instruments Brazil

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  Join your data file.

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