Paging query needed help for large table - force a different index

I use a slight modification of the pagination to be completed request to ask Tom: [http://www.oracle.com/technology/oramag/oracle/07-jan/o17asktom.html]

Mine looks like this to extract the first 100 lines of everyone whose last name Smith, ordered by join date:

SELECT members.*
FROM members,
(
    SELECT RID, rownum rnum
    FROM
    (
        SELECT rowid as RID 
        FROM members
        WHERE last_name = 'Smith'
        ORDER BY joindate
    ) 
    WHERE rownum <= 100 
) 
WHERE rnum >= 1 
         and RID = members.rowid

The difference between this and ask Tom is my innermost query returns just the ROWID. Then, in the outermost query we associate him returned to the members table ROWID, after that we have cut the ROWID down to only the 100 piece we want. This makes it MUCH more (verifiable) fast on our large tables, because it is able to use the index on the innermost query (well... to read more).
The problem I have is this:

SELECT rowid as RID 
FROM members
WHERE last_name = 'Smith'
ORDER BY joindate

It will use the index for the column predicate (last_name) rather than the unique index that I defined for the column joindate (joindate, sequence). (Verifiable with explain plan). It is much slower this way on a large table. So I can reference using one of the following methods:

SELECT /*+ index(members, joindate_idx) */ rowid as RID 
FROM members
WHERE last_name = 'Smith'
ORDER BY joindate

SELECT /*+ first_rows(100) */ rowid as RID 
FROM members
WHERE last_name = 'Smith'
ORDER BY joindate

Whatever it is, it now uses the index of the column ORDER BY (joindate_idx), so now it's much faster there not to sort (remember, VERY large table, millions of records). If it sounds good. But now, on my outermost query, I join the rowid with the significant data in the members table columns, as commented below:

SELECT members.*      -- Select all data from members table
FROM members,           -- members table added to FROM clause 
(
    SELECT RID, rownum rnum
    FROM
    (
        SELECT /*+ index(members, joindate_idx) */ rowid as RID   -- Hint is ignored now that I am joining in the outer query
        FROM members
        WHERE last_name = 'Smith'
        ORDER BY joindate
    ) 
    WHERE rownum <= 100 
) 
WHERE rnum >= 1 
        and RID = members.rowid           -- Merge the members table on the rowid we pulled from the inner queries

As soon as I did this join, this goes back to the use of the index of predicate (last_name) and perform the sort once he finds all the corresponding values (which can be a lot in this table, there is a cardinality high on some columns).

My question therefore, in the query full above, is it possible that I can get to use the ORDER of indexing BY column to prevent having to sort? The join is what makes go back to using the predicate index, even with notes. Remove the join and just return the ROWID for these 100 records and it flies, even over 10 millions of documents.

It would be great if there was some generic hint that could accomplish this, such as if we change the table/column/index, do not change the indicator (indicator FIRST_ROWS is a good example of this, while the INDEX indicator is the opposite), but any help would be appreciated. I can provide explain plans for the foregoing, if necessary.

Thank you!

Tags: Database

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I wrote here a basis of hierarchical queries:

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The output of your power supply circuit 3 (with 5 V, not the 1.5 V regulator regulator) was 4.99995 V.

There are a few messages about changing templates published for compatibility Multisim woth. You can search those to see if there are any suggestions on what you'll need to fix in the model.

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Need help for query flat_file type clobdata oracle table data.

Hi Sir,

I need help to query oracle table flat file data having given clob type.

Oracle Version:

Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
PL/SQL Release 10.2.0.1.0 - Production
"CORE     10.2.0.1.0     Production"
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production



Source table

  CREATE TABLE order_details 
   (     QUEUE_SEQNUM NUMBER(10,0) NOT NULL ENABLE, 
     LINE_SEQNUM NUMBER(10,0) NOT NULL ENABLE, 
     CHAR_DATA CLOB, 
     OPTIMISTIC_LOCK_KEY NUMBER(20,0)
   )

COLUMN FOR CHAR_DATA FLAT_FILE

EU,6067AT,AT10,000000402004,NexiumGERDManagementProject,Z435,,ZZ29,NIS-GOLD,AT
EU,6067AT,AT10,000000402038,NIS-OEU-ARI-2007/1,Z450,,ZZ29,NIS-OEU-ARI-2007/1,AT
EU,6067AT,AT10,000000402039,SymbicortNISinCOPD,Z450,,ZZ29,NIS-REU-DUM-2007/1,AT
EU,6067AT,AT10,000000402040,D1443L00044SeroquelXRRuby,Z450,,ZZ29,D1443L00044,AT
EU,6067AT,AT10,000000402041,NIS-GEU-DUM-2008/1,Z450,,ZZ29,NIS-GEU-DUM-2008/1,AT
EU,6067AT,AT10,000000402042,SonstigeAktivitÃ¤tenLCM,Z450,,ZZ29,.,AT
EU,6067AT,AT10,000000402134,D1680L00002Saxagliptin,Z450,,ZZ29,D1680L00002,AT
EU,6067AT,AT10,000000402199,SeroquelWaveNIS,Z450,,ZZ29,NIS-NEU-DUM-2009/1,AT
EU,6067AT,AT10,000000402313,SeroquelExtra(D1443L00082),Z450,,ZZ29,D1443L00082,AT
EU,6067AT,AT10,000000402517,AtlanticD5130L00006(AZD6140),Z450,,ZZ29,D5130L00006,AT
EU,6067AT,AT10,000000554494,ArimidexSt.Gallen(13+2),Z142,,ZZ09,,AT
EU,6067AT,AT10,000000554495,ArimidexASCO(5delegates),Z142,,ZZ09,,AT
EU,6067AT,AT10,000000554496,ArimidexSanAntonio6delegates,Z142,,ZZ09,,AT
EU,6067AT,AT10,000000554497,ArimidexBreastCancerSummit(13+2),Z130,,ZZ09,,AT
EU,6067AT,AT10,000000554498,ArimidexEIH(15delegates),Z130,,ZZ09,,AT
EU,6067AT,AT10,000000554499,ArimidexNIFA(200delegates),Z135,,ZZ09,,AT
EU,6067AT,AT10,000000554500,ArimidexNIFAworkshops(8x25),Z135,,ZZ09,,AT
EU,6067AT,AT10,000000554501,ArimidexPraktischeGyn.Fortbildung,Z147,,ZZ09,,AT
EU,6067AT,AT10,000000554502,ArimidexAGO,Z147,,ZZ09,,AT
EU,6067AT,AT10,000000554503,ArimidexHÃ¤mato/OnkologieKongress,Z147,,ZZ09,,AT
EU,6067AT,AT10,000000554504,ARIMIDEXGYNÃ¤KOLOGENKONGRESS,Z147,,ZZ09,,AT
EU,6067AT,AT10,000000554505,ArimidexChirurgenkongress,Z147,,ZZ09,,AT

EXPECTED RESULTS:

AFFIRM_CODE COMPANY_CODE INTERNAL_ORDER_CODE INTERNAL_ORDER_DESC ENIGMA_ACTIVITY             SUB_ACTIVITY_CODE IN_AFF_IND ORDER_TYPE EXTERNAL_ORDER COUNTRY        
EU          6067AT       AT10                 000000402004       NEXIUMGERDMANAGEMENTPROJECT     Z435           NULL        ZZ29       NIS-GOLD        AT             
EU          6068AT       AT11                 000000402005       NEXIUMGERDMANAGEMENTPROJECT     Z435           NULL        ZZ29       NIS-GOLD        AT

Sorry, my bad. Without database at hand, I'll try 'baby steps' (borrowed from Frank) so you don't confuse it with errors that I might add (happens far too often already, but at least you won't "swallow" as forum members think is one of the main goals of this fighter - help her learn - providing not only the proverbial fish.)
Search the Forum - your problem is one of its best sellers. Watching {message identifier: = 10694602} ("split string into" was the key word used in research) you can try something as

select table_row,
       level clob_row,
       regexp_substr(char_data,'[^' || chr(13) || chr(10) || ']+',1,level) the_line
  from (select to_char(queue_seqnum)||':'||to_char(line_seqnum) table_row,
               char_data
          from order_details
       )
 connect by regexp_substr(char_data,'[^' || chr(13) || chr(10) || ']+',1,level) is not null
        and prior char_data = char_data
        and prior table_row = table_row
        and prior sys_guid() is not null

to get all the s the_lineall CLOB and after that the use of the example even to get your columns of each the_line.

Concerning

Etbin

Edited by: Etbin on 3.2.2013 09:01

.. .but I m connected to do things according to the instructions, I can't do something.

Used to happen to me too and I did as told to the but only after explaining any disadvantages, I was aware of in time. The last sentence is usually: "O.K. now be just and Don't come back with that kind of thing when it turns out that this isn't the right thing."
rp0428 post - something to remember.

need help for a conditional query

guys this is just. as an extension of this post that Frank was helping me. IM reposting because my needs change slightly and im having a hell of a time trying to change the query.
Here are the previous post.
need help with query can find data back please help.

CREATE TABLE "FGL"
  (
    "FGL_GRNT_CODE" VARCHAR2(60),
    "FGL_FUND_CODE" VARCHAR2(60),
    "FGL_ACCT_CODE" VARCHAR2(60),
    "FGL_ORGN_CODE" VARCHAR2(60),
    "FGL_PROG_CODE" VARCHAR2(60),
    "FGL_GRNT_YEAR" VARCHAR2(60),
    "FGL_PERIOD"    VARCHAR2(60),
    "FGL_BUDGET"    VARCHAR2(60)
  )

data

Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('240055','240055','7600','4730','02','11','00','400');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('240055','240055','7240','4730','02','10','1','100');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('240055','240055','7240','4730','02','10','1','0');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('240055','240055','7600','4730','02','11','1','400');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('360055','360055','7200','4730','02','10','1','400');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('360055','360055','7600','4730','02','10','1','400');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('240055','240055','7240','4730','02','10','14','200');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('240055','240055','7600','4730','02','10','14','100');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('240055','240055','7240','4730','02','10','14','200');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('240055','240055','7240','4730','02','10','2','100');
Insert into FGL (FGL_GRNT_CODE,FGL_FUND_CODE,FGL_ACCT_CODE,FGL_ORGN_CODE,FGL_PROG_CODE,FGL_GRNT_YEAR,FGL_PERIOD,FGL_BUDGET) values ('240055','240055','7240','4730','02','11','2','600');

I need to find the year of greater subsidy for the granting by a period setting.
Once I found the great year, I need to check the value of the period 14 this grant for the previous year and add it to the amount of the budget for this grant. However if there is an entry in the biggest year for period 00 so I need to ignore the period 14 of the previous year and the current calculation period + (current period - more great year 00)

hope that makes sense, so in other words, with the new data above. If I asking me a second period of the grant year 11. I'd end up with $800

because the greatest year is 11 it contains one point 0 with $ 400, so my total should be
amount of period $2,600
period $0 400 - period $2 600 = $200

600 + 200 = $800

If I have question period 1 grant 360055 I'd end up just with 800 grnt year 10.

I tried to edit this query you have provided me with no luck. I tried for several embarrassed day but I'm saying I can just do what im trying to do.
can you please help me.

Here's the query provided by frank kulash who graciously put it together for me.

WITH     got_greatest_year     AS
(
     SELECT     fgl.*     -- or whatever columns are needed
     ,     MAX ( CASE 
                 WHEN  fgl_period = :given_period 
                 THEN  fgl_grnt_year
                END
              ) OVER ()     AS greatest_year
     FROM     fgl
)
SELECT     SUM (fgl_budget)     AS total_budget     -- or SELECT *
FROM     got_greatest_year
WHERE     (     fgl_grnt_year     = greatest_year
     AND     fgl_period     = :given_period
     )
OR     (     fgl_grnt_year     = greatest_year - 1
     AND     fgl_period     = 14
     )
;

Miguel

Hi, Miguel.

You are waying that when larger year who has: given_period also a period = '00' (or '0', or whatever it is you want to use), then you want to double the budget of the given_period (subtract the '00' budget and do not count '14' year pevious)? If so, add another condition to the CASE statement that decides what you've summarized:

WITH     got_greatest_year     AS
(
     SELECT       TO_NUMBER (fgl_grnt_year)     AS grnt_year
     ,       fgl_period
     ,       TO_NUMBER (fgl_budget)     AS budget
     ,       MAX ( CASE
                   WHEN  fgl_period = :given_period
                   THEN  TO_NUMBER (fgl_grnt_year)
                  END
                ) OVER ()     AS greatest_year
     FROM       fgl
)
,     got_cnt_00     AS
(
     SELECT     grnt_year
     ,     fgl_period
     ,     budget
     ,     greatest_year
     ,     COUNT ( CASE
                   WHEN  grnt_year     = greatest_year
                   AND       fgl_period     = '00'
                   THEN  1
                     END
                ) OVER ()          AS cnt_00
     FROM    got_greatest_year
)
SELECT       SUM ( CASE
                    WHEN  grnt_year     = greatest_year                    -- New
              AND       fgl_period     = :given_period                    -- New
              AND       cnt_00     > 0            THEN  budget * 2     -- New
                    WHEN  grnt_year     = greatest_year
              AND       fgl_period     = :given_period       THEN  budget
                    WHEN  grnt_year     = greatest_year
              AND       fgl_period     = '00'            THEN -budget
                    WHEN  grnt_year     = greatest_year - 1
              AND       fgl_period     = '14'
              AND       cnt_00     = 0            THEN  budget
                END
           )          AS total_budget
FROM       got_cnt_00
;

You will notice it is the same as the previous query, I posted, with the exception of 3 lines marked 'new '.

I need help for query AVG

I need help with a simple query in an ORACLE database. I tried a lot of things that I found on the internet, but none of them worked for me.
The following query retrieves four lines:
SELECT sampled_date AS VALUE1, VALUE2 AS result, 0 as value3
Of asw_lab
WHERE template_result = 'A' AND analysis = 'B' AND ROWNUM < 5
ORDER BY sampled_date DESC;
I would like to calculate a moving average of the last four values with the date of the sample of the last line.
For example, I have this result for the query above:
Value1 value2 value3
01/04/14-16:00 1 0
01/04/14 15:00 2 0
01/04/14 14:00 3 0
01/04/14 13:00 4 0
I want to extract the below my average/query calculation result:
Value1 value2 value3
01/04/14-16:00 2.5 0
Can you help me create a request to that effect?
Thank you

Maybe it's

Select max (VALUE1) VALUE1, VALUE2 avg (VALUE2), avg (VALUE3) value3

Of

(

SELECT sampled_date AS VALUE1, VALUE2 AS result, 0 as value3

Of asw_lab

WHERE template_result = 'A' AND analysis = 'B' AND ROWNUM<>

)

need help for this query

Hi gurus

need help with this query,

I want to display the records in the table emp

SQL> Select Deptno,sal,sal/SUMSAL Percent,rn
  2  From  ( Select emp.*,Sum(Sal) Over() "SUMSAL",Row_number() Over(Order by sal Desc) rn
  3   From emp
  4        )
  5  /

      EMPNO     DEPTNO        SAL    PERCENT         RN
--------- ---------- ---------- ---------- ----------
     7839         10       5000 .172265289          1
     7902         20       3000 .103359173          2
     7788         20       3000 .103359173          3
     7566         20       2975 .102497847          4
     7698         30       2850 .098191214          5
     7782         10       2450 .084409991          6
     7499         30       1600 .055124892          7
     7844         30       1500 .051679587          8
     7934         10       1300 .044788975          9
     7521         30       1250 .043066322         10
     7654         30       1250 .043066322         11
     7876         20       1100 .037898363         12
     7900         30        950 .032730405         13
     7369         20        800 .027562446         14

14 rows selected.

I want just the records

      EMPNO     DEPTNO        SAL    PERCENT         RN
---------- ---------- ---------- ---------- ----------
      7839         10       5000 .172265289          1
      7902         20       3000 .103359173          2
      7788         20       3000 .103359173          3
      7566         20       2975 .102497847          4
      7698         30       2850 .098191214          5
with sum (Percent) of remaing records.....
    Others                          .420327304

Thank you

Published by: SeenuGuddu on February 27, 2011 03:39

with a as
(
Select
Empno, Deptno ,sal, sal/SUMSAL Percent,
case when rn<=5 then rn else null end rnm
From  (Select emp.*, Sum(Sal) Over() "SUMSAL",
Row_number() Over(Order by sal Desc) rn
From emp)
)
select
case when max(rnm) is not null then to_char(max(empno)) else 'Others:' end empno,
case when max(rnm) is not null then max(deptno) else null end deptno,
case when max(rnm) is not null then max(sal) else null end sal,
to_char(sum(percent), '90.99') percent,
max(rnm) rn
from a
group by rnm order by rnm

EMPNO                                    DEPTNO                 SAL                    PERCENT RN
---------------------------------------- ---------------------- ---------------------- ------- ----------------------
7839                                     10                     5000                     0.17  1
7902                                     20                     3000                     0.10  2
7788                                     20                     3000                     0.10  3
7566                                     20                     2975                     0.10  4
7698                                     30                     2850                     0.10  5
Others:                                                                                  0.42                         

6 rows selected

Need help for slideshow

I edited a video, which is basically still images. However, I have chosen images in all sizes, thinking, wrongly, that what eventually once uploaded to YouTube with the same footprint. Is there a step process that can help me achieve this goal?
I would like that all the scenes in my video to appear, once uploaded to YouTube, to be of the same size. Some images are larger than others, but those who are smaller have a black border surrounding them. I admit that I need a lot of help with that. Thank you.
Post edited by: Kevin Monahan
Reason: your title is too long

So you're ready for the next show!

Or, maybe just happy you did it through this one and very well if you have never to do it again.

Are you able to use the ' ~ ' key to the entire window and "control ~" for full screen?

Another feature may be useful for the next is "automate to sequence...". ». If your source of the layer film is ready just to the right, it can be a huge time saver. Even if you compare it to what it's like 'Text to Table' action in Microsoft Word. If the text is formatted just right, you end up with a large table to the research. If a single line of text is disabled, you can spend a lot of time tweaking things (and to test your patience).

Bitmap Vs domain of index for large tables

I have a DB warehouse which consists of very large tables.
I have two questions:
1 can I use Bitmap or field type index?
2. use a different tablespace for storing the indices? This would improve performance?
Please give me advice to improve the performance of queries for these large tables (more than 300 M record).
Concerning

When to use bitmap indexes

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

-The column has a low cardinality: little separate value

-Bitmap indexes are particularly useful for complex with ad-hoc queries

long WHERE clauses or applications of aggregation (containing SUM, COUNT, or other

aggregate functions)

-The table contains the number of lines (1,000,000 lines with 10,000 distinct values)

may be acceptable)

-There are frequent, possibly ad hoc queries on the table

-L' environment is focused on the data warehouse (System DSS). Bitmap indexes are

not ideal for due processing (OLTP) environments transactional online

their locking behavior. It is not possible to lock a single bitmap.

The smallest amount of a bitmap that can be locked is a bitmap segment, which

can be a block of data up to half size. Changing the value of a row results in

a bitmap segment becomes locked, blocking to force change on a number of lines.

This is a serious drawback when there are several UPDATE, INSERT or DELETE

statements made by users. It is not a problem when loading data or

updated to the stock in bulk, as in data warehouse systems.

-Bitmap join indexes are a new method of 9.0 by which joins can be avoided in

pre-creation index bitmap on the join criteria.

The BJI is an effective way of space reduction in the volume of selected data.

The data resulting from the join operation and restrictions are

kept permanently in a BJI. The join condition is a join, equi-internal between the

column/columns in primary key of the dimension and the foreign key tables

column or columns in the fact table.

When to use domain indexes

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

https://docs.Oracle.com/CD/E11882_01/AppDev.112/e41502/adfns_indexes.htm#ADFNS00504

Tecra R840 - need help for installing the SSD

Hello

Sorry, again, but I really need help with that?
My new ssd (arriving in a few days) is a Plextor M5P which is 7 mm thick! My Tecra R840-16J have a thickness 9.5 mm HDD and what I've seen is no caddy!
I would be grateful all the tricks for installing the ssd drive in my Tecra!

Thanks for your time,

Paulo

Hello Paulo

As far as I know that some models are available with drive HARD and some with SSD these models with SSD have small SSD support. SSD is fixed by 4 screws in this medium.

I put t really know how to help you now. Maybe you should contact the nearest Toshiba service provider and ask for help. I think they can check the part number of this door - or maybe order one for you.

Paging query needed help for large table - force a different index

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