Optimized query to find Min and max of a col in a table

I have a table doc_boe_rec with record count 12375934
the primary key columns are (boe_rec_id,psd_serial_num).
No other ndexes are present on this table.
I want an optimized query which will give both the results :
1.Min boe_rec_id (boe_rec_id from 1st record)
2.Max boe_rec_id from this table with rows limited to a value say 5000.
i.e (boe_rec_id from 5000th column value from table )
Thanks
Manoj

1.Min boe_rec_id (boe_rec_id from 1st record)It is confusing for me. The min value for the first, hmmm...
2.Max boe_rec_id from this table with rows limited to a value say 5000.Not more clear...
Please details your requirements.
Nicolas.

Similar Messages

Find min and max from a bunch of numbers

hi,
i have a bunch of numbers, and i need to find the min and max.
so i have a arraylist which contains objects....whats the best way to find the min number and max number of all these objects?
thanks

You're close, but you can do them all at the same time without temp variables..
double maximumX = 0;
double minimumX = 0;
double maximumY = 0;
double minimumY = 0;
for (int i = 0; i < myobjects.size(); i++) {
     mything d2d = (mything) myobjects.get(i);
     maximumX = Math.max(d2d.getBounds().getMaxX(), maximumX);
     minimumX= Math.min(d2d.getBounds().getMinX(), minimumX);
     maximumY = Math.max(d2d.getBounds().getMaxY(), maximumY);
     minimumY = Math.min(d2d.getBounds().getMinY(), minimumY);
}Since you are dealing with rectangles, you could add them all to an Area and get the bounds of the Area, but that's probably slower.

How to find min and max of a field from sorted internal table

Hi,
I have sorted Internal Table by field f1.
How do I find max and min value of f1.
For min value of f1 I am using,
READ TABLE IT1 INDEX 1.
IT1-F1 = MIN.
Is this correct? And how do I find the max value of f1 from this table.
Thanks,
CD

Yes, that is right, and you can get the max like this.
data: lv_lines type i.
* get min
READ TABLE IT1 INDEX 1.
MIN = IT1-F1.
* get max
lv_lines = lines( it1 ).
read table it1 index lv_lines.
MAX = IT1-F1.
Regards,
Rich Heilman

Finding Min and Max

I have the following data stored in java. The names are stored as a 1 dimensional array and the figures as a 2 dimensional array.
-----------------------------Min Max
Joe Jones 32 22 20 10 ? ?
Jim Long 10 45 10 60 ? ?
Tom Doon 5 10 50 70 ? ?
What I want to do is to find the Mininum and Maximum value of each row. It would be displayed where the question ,marks are. What should my code be???

you can use the sort method to determine which is the max/min and then return them & still keep your list as is.
something like:
-----------------------------Min Max
Joe Jones 32 22 20 10 sort.getMax() sort.getMin()
Jim Long 10 45 10 60 ? ?
Tom Doon 5 10 50 70 ? ?
for the getMax() method - return the last element in the sorted array
for the getMin() method - return the first element in the sorted array

Query to group min and max times

Can anyone please tell me how to write the followinf query?
USER DATE MIN_TIME MAX_TIME
ASMITH 01/01/2000 06:01:01 17:01:01
ASMITH 02/01/2000 06:08:01 17:06:01
ASMITH 03/01/2000 06:01:01 17:01:01
STIGER 01/01/2000 06:01:01 06:01:01
I have 2 columns: USER and WORK_DATE
I want to return the min(time) max(time) grouped per day and user.
So for every user I want the start time and end time for everyday.
Thanx

select user, date, min(time), max(time)
from table
group by user, date
Can anyone please tell me how to write the followinf query?
USER DATE MIN_TIME MAX_TIME
ASMITH 01/01/2000 06:01:01 17:01:01
ASMITH 02/01/2000 06:08:01 17:06:01
ASMITH 03/01/2000 06:01:01 17:01:01
STIGER 01/01/2000 06:01:01 06:01:01
I have 2 columns: USER and WORK_DATE
I want to return the min(time) max(time) grouped per day and user.
So for every user I want the start time and end time for everyday.
Thanx

Best Way to find min and max

Hi
I wish to know is there any better way to get min(zseq) from a query statement?
I have data as :
00010 10 1 10/10/2006   - need to get tihs date (min)
00010 10 2 12/10/2006
00010 10 3 15/10/2006 - need to get this date(max-1)
00010 10 4 18/10/2006 - need to get this date (max)
My query :
SELECT ZCDD FROM ZVI2D INTO S_1ST_ZCDD
      WHERE ZVBELN = WA_OUTPUT_ALL-VBELN AND ZPOSNR = WA_OUTPUT_ALL-POSNR
        AND ZSEQ IN ( SELECT MIN( ZSEQ ) FROM ZVI2D WHERE ZVBELN = WA_OUTPUT_ALL-VBELN AND ZPOSNR = WA_OUTPUT_ALL-POSNR ).
         AND ZDATUM = WA_OUTPUT_ALL-ZDATUM ).
    ENDSELECT
I will reward points if you are able to give a good uggestion. Thanks.

i think you can get max and min from the select query itself just check my previous posting for the min. But i dont think you can get the second maximum value from the select query. For that you have to store the data in itab and sort that by descending read thae table itab with index 1(max) and index 2(second largest) and last for min.
suppose you have data inyour itab.
data : lin type i.
sort itab by <field name> descending.
read table itab index 1."for max value.
write : / itab-<field>.
read table itab index 2."second largest.
write : / itab-<field>.
describe table itab lines lin.
read table itab index lin.
write : / itab-<field>.
regards
shiba dutta

Finding Min and Max date

SELECT * FROM (
SELECT 'STOR_A' STORE_NAME ,'BX1' BOX_NO, 'X11' LOC, '01-JAN-2010' MOVE_DT FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX1' , 'X21' , '03-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX1' , 'X13' , '05-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX1' , 'X41' , '07-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX1' , 'X15' , '09-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX2' , 'X31' , '02-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX2' , 'X71' , '04-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX2' , 'X18' , '06-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX3' , 'X91' , '04-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX3' , 'X10' , '05-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX3' , 'X14' , '07-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX3' , 'X51' , '10-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_A' ,'BX3' , 'X16' , '12-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_B' ,'BX2' , 'X41' , '09-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_B' ,'BX2' , 'X74' , '11-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_B' ,'BX2' , 'X31' , '12-JAN-2010' FROM DUAL UNION ALL
SELECT 'STOR_B' ,'BX2' , 'X68' , '17-JAN-2010' FROM DUAL
[pre/]
I have the data of the Boxes which came to the store and changed the locations on a date.
how can i select in a single row the as below. Boxwise the date and location on which received in and sent out
[pre]
BOX_NO     STORE_NAME     IN_LOC              IN_DATE          OUT_LOC     OUT_DATE
BX1     STOR_A          X11          01-Jan-10     X15     09-Jan-10
BX2     STOR_A          X31          02-Jan-10     X18     06-Jan-10
BX3     STOR_A          X91          04-Jan-10     X16     12-Jan-10
BX2     STOR_B          X41          09-Jan-10     X68     17-Jan-10
[pre/]
Can someone helpout from the query

using aggregate keep first/last functions:
with my_tab as (SELECT 'STOR_A' STORE_NAME ,'BX1' BOX_NO, 'X11' LOC, to_date('01-JAN-2010', 'dd-MON-yyyy') MOVE_DT FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX1' , 'X21' , to_date('03-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX1' , 'X13' , to_date('05-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX1' , 'X41' , to_date('07-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX1' , 'X15' , to_date('09-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX2' , 'X31' , to_date('02-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX2' , 'X71' , to_date('04-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX2' , 'X18' , to_date('06-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX3' , 'X91' , to_date('04-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX3' , 'X10' , to_date('05-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX3' , 'X14' , to_date('07-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX3' , 'X51' , to_date('10-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_A' ,'BX3' , 'X16' , to_date('12-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_B' ,'BX2' , 'X41' , to_date('09-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_B' ,'BX2' , 'X74' , to_date('11-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_B' ,'BX2' , 'X31' , to_date('12-JAN-2010', 'dd-MON-yyyy') FROM DUAL UNION ALL
                SELECT 'STOR_B' ,'BX2' , 'X68' , to_date('17-JAN-2010', 'dd-MON-yyyy') FROM DUAL)
select box_no,
       store_name,
       min(loc) keep (dense_rank first order by move_dt) in_loc,
       min(move_dt) in_date,
       max(loc) keep (dense_rank last order by move_dt) out_loc,
       max(move_dt) out_date
from   my_tab
group by box_no,
         store_name
order by store_name, box_no;
BOX STORE_ IN_ IN_DATE             OUT OUT_DATE
BX1 STOR_A X11 01/01/2010 00:00:00 X15 09/01/2010 00:00:00
BX2 STOR_A X31 02/01/2010 00:00:00 X18 06/01/2010 00:00:00
BX3 STOR_A X91 04/01/2010 00:00:00 X16 12/01/2010 00:00:00
BX2 STOR_B X41 09/01/2010 00:00:00 X68 17/01/2010 00:00:00Edited by: Boneist on 29-Jul-2010 14:32
Oh darn it! Too slow! {noformat}*pootles off for more caffeine*{noformat}

Performance Issue using min() and max() in one SQL statement

I have a simple query that selects min() and max() from one column in a table in one sql statment.
The table has about 9 Million rows and the selected column has a non unique index. The query takes 10 secs. When i select min() and max() in separate statements, each takes only 10 msecs:
This statement takes 10 secs:
select min(date_key) , max(date_key)
from CAPS_KPIC_BG_Fact_0_A
where date_key != TO_DATE(('1900-1-1' ),( 'YYYY-MM-DD'))
This statement takes 10 msecs:
select min(date_key)
from MYTABLE
where date_key != TO_DATE(('1900-1-1' ),( 'YYYY-MM-DD'))
union all
select max(date_key) from MYTABLE
Because the first statement is part of an autmatic generated SQL of an application, i can't change it and i have to optimize the data model. How can i speed up the first statement?

I've ran similar query on a table that has 10 milliion rows, with an index on the date column
This is what I have found:
SQL> set timing on
1 SELECT MIN(ID_DATE) MIN_DATE, MAX(ID_DATE) MAX_DATE
2      FROM MY_DATE
3*     WHERE ID_DATE != TO_DATE(('1900-1-1' ),( 'YYYY-MM-DD'))
SQL> /
MIN_DATE MAX_DATE
03-APR-76 06-JAN-02
real: 43383
SQL> SELECT MIN(ID_DATE) MIN_DATE FROM MY_DATE
2   WHERE ID_DATE != TO_DATE(('1900-1-1' ),( 'YYYY-MM-DD'))
3 UNION ALL
4 SELECT MAX(ID_DATE) MAX_DATE FROM MY_DATE
5   WHERE ID_DATE != TO_DATE(('1900-1-1' ),( 'YYYY-MM-DD'))
6 /
MIN_DATE
03-APR-76
06-JAN-02
real: 20
SQL> SELECT MIN_DATE, MAX_DATE FROM
2 (SELECT MAX(ID_DATE) MAX_DATE FROM MY_DATE
3 WHERE ID_DATE != TO_DATE(('1900-1-1' ),( 'YYYY-MM-DD')) ) A,
4 (SELECT MIN(ID_DATE) MIN_DATE FROM MY_DATE
5 WHERE ID_DATE != TO_DATE(('1900-1-1' ),( 'YYYY-MM-DD')) ) B
6 /
MIN_DATE MAX_DATE
03-APR-76 06-JAN-02
real: 10
SQL> My conculsion, there is nothing you can do to the tables that will improve that particular statement.
Why can't you modify the application?

Find more than one min and max in 2D array contain 0 rows

Hi
I have a 2D array and I would like to find the max and min elements between series of 0s. As you can see in the picture If I remove all 0s from the array and use the max and min function then I will have just one min and one max but I need to find min and max after every 0 rows so you can see from the picture ( just as an example) I will have 3 min and 3 max numbers. Would you please help me with this code. Do you now any algorithm that can find min and max between 0s?
I have also attached my code to remove 0s and then search for max and min numbers but as I mentioned I need min and max for every part
Many thanks
Attachments:
2.jpg ‏82 KB
3.jpg ‏27 KB

Thanks altenbach
I have attached the vi to this post. I would really apperciate if you help me with this example. The min values should be 100, 1500 and 4000 and the max values should be 1200,2600,5400 so as u mentioned the output should be this 2D array
100,1200
1500,2600
4000,5400
Attachments:
new.vi ‏6 KB

Query about min and max and middle row of a table

suppose i have table emp and field
v_date date;
which has data in time stamp
time
10:20
10:25
10:30
10:32
10:33
10:35
10:36
10:38
I need only min time and max time and two record between min and max

I need only min time and max time and two record between min and max Like this?
SQL> create table t (id number);
Table created.
SQL>
SQL> insert into t values (1020);
1 row created.
SQL> insert into t values (1025);
1 row created.
SQL> insert into t values (1030);
1 row created.
SQL> insert into t values (1032);
1 row created.
SQL> insert into t values (1033);
1 row created.
SQL> insert into t values (1035);
1 row created.
SQL> insert into t values (1036);
1 row created.
SQL> insert into t values (1038);
1 row created.
SQL>
SQL> commit;
Commit complete.
SQL>
SQL> select * from t;
     ID
   1020
   1025
   1030
   1032
   1033
   1035
   1036
   1038
8 rows selected.
SQL>
SQL>
SQL> select decode(rownum, 1, min_val, 4, max_val, next_val) your_data from (
2 select first_value (id) over (partition by 'a' order by 'a') min_val,
3         last_value (id) over (partition by 'a' order by 'a') max_val,
4         id,
5         lead(id) over (partition by 'a' order by id) next_val
6   from t
7 order by id
8   )
9 where min_val <> next_val and max_val <> next_val
10 and rownum <= 4;
YOUR_DATA
     1020
     1030
     1032
     1038
SQL>

To find out the min and max memory been used by each parameter under SGA_MA

Hi,
Can any please tell me how to find out the min and max memory been used by each parameter under SGA_MAX and SGA_TARGET ? below is the db CRMS65T. If any such script is there please provide me
SQL> select name from v$database;
NAME
CRMS65T
SQL> show parameter sga
NAME                                 TYPE        VALUE
lock_sga                             boolean     FALSE
pre_page_sga                         boolean     FALSE
sga_max_size                         big integer 1000M
sga_target                           big integer 1000MThanks in advance

Can any please tell me how to find out the min and max memory been used by each parameter under SGA_MAX and SGA_TARGET ? below is the db CRMS65T. If any such script is there please provide meI guess your question is, each memory components of SGA? if so
SQL> select * from v$sgainfo;
NAME                                  BYTES RES
Fixed SGA Size                      2088504 No
Redo Buffers                       18882560 No
Buffer Cache Size                 616562688 Yes
Shared Pool Size                  301989888 Yes
Large Pool Size                     4194304 Yes
Java Pool Size                      4194304 Yes
Streams Pool Size                         0 Yes
Granule Size                        4194304 No
Maximum SGA Size                  947912704 No
Startup overhead in Shared Pool   125829120 No
Free SGA Memory Available                 0Also check
SQL> select COMPONENT,CURRENT_SIZE,MIN_SIZE,MAX_SIZE,USER_SPECIFIED_SIZE from v$sga_dynamic_components;
shared pool                                                         301989888 301989888          0           209715200
large pool                                                            4194304    4194304          0             4194304
java pool                                                             4194304    4194304          0             4194304
streams pool                                                                0          0          0                   0
DEFAULT buffer cache                                                616562688 616562688          0           603979776
KEEP buffer cache                                                           0          0          0                   0
RECYCLE buffer cache                                                        0          0          0                   0
DEFAULT 2K buffer cache                                                     0          0          0                   0
DEFAULT 4K buffer cache                                                     0          0          0                   0
DEFAULT 8K buffer cache                                                     0          0          0                   0
DEFAULT 16K buffer cache                                                    0          0          0                   0
DEFAULT 32K buffer cache                                                    0          0          0                   0
ASM Buffer Cache                                                            0          0          0           603979776
13 rows selected.
SQL>Edited by: CKPT on Sep 19, 2011 8:55 AM

MIN and MAX datetimes ti find range

I am using Oracle 11g version
create table re(Name char(20),Datetime char(45),val1 number);
insert into re values('abc','10/29/2012 13:00','1.5')
insert into re values('abc','10/29/2012 13:05','1.5')
insert into re values('abc','10/29/2012 13:10','1.5')
insert into re values('abc','10/29/2012 13:15','1.5')
insert into re values('abc','10/29/2012 13:20','0.00')
insert into re values('abc','10/29/2012 13:25','0.00')
insert into re values('abc','10/29/2012 13:30','0.00')
insert into re values('abc','10/29/2012 13:35','0.00')
insert into re values('abc','10/29/2012 13:40','2.1')
insert into re values('abc','10/29/2012 13:45','2.3')
insert into re values('abc','10/29/2012 13:50','2.1')
insert into re values('abc','10/29/2012 13:55','2.1')
insert into re values('abc','10/29/2012 14:00','2.2')
O/P:
In this way data is stored in database.Needed output is, I want the datetime column data range with min and max values where val1>0 only.
Expected result while we consider the above data is::
Name mintime maxtime
abc 10/19/2012 13:00 10/19/2012 13:15
abc 10/29/2012 13:40 10/29/2012 14:00
For this I tried something like this,
select name, min(to_date(Datetime ,'mm/dd/yyyy hh24:mi')) start, max(to_date(Datetime ,'mm/dd/yyyy hh24:mi')) end from (
select name, Datetime ,to_date(Datetime ,'mm/dd/yyyy hh24:mi') - rank() over (partition by loc_name order by t1 asc) Val_col from re where val1 > 0
) group by lname, Val_col
but I am getting the output like this for above query.
name start end
abc 10/29/2012 13:00 10/29/2012 13:00
abc 10/29/2012 13:05 10/29/2012 13:05
so.on.
Edited by: 913672 on Apr 3, 2013 3:07 AM

913672 wrote:
I am using Oracle 11g version
create table re(Name char(20),Datetime char(45),val1 number);
insert into re values('abc','10/29/2012 13:00','1.5')
insert into re values('abc','10/29/2012 13:05','1.5')
insert into re values('abc','10/29/2012 13:10','1.5')
insert into re values('abc','10/29/2012 13:15','1.5')
insert into re values('abc','10/29/2012 13:20','0.00')
insert into re values('abc','10/29/2012 13:25','0.00')
insert into re values('abc','10/29/2012 13:30','0.00')
insert into re values('abc','10/29/2012 13:35','0.00')
insert into re values('abc','10/29/2012 13:40','2.1')
insert into re values('abc','10/29/2012 13:45','2.3')
insert into re values('abc','10/29/2012 13:50','2.1')
insert into re values('abc','10/29/2012 13:55','2.1')
insert into re values('abc','10/29/2012 14:00','2.2')
O/P:
In this way data is stored in database.Needed output is, I want the datetime column data range with min and max values where val1>0 only.
Expected result while we consider the above data is::
Name mintime maxtime
abc 10/19/2012 13:00 10/19/2012 13:15
abc 10/29/2012 13:40 10/29/2012 14:00
For this I tried something like this,
select name, min(to_date(Datetime ,'mm/dd/yyyy hh24:mi')) start, max(to_date(Datetime ,'mm/dd/yyyy hh24:mi')) end from (
select name, Datetime ,to_date(Datetime ,'mm/dd/yyyy hh24:mi') - rank() over (partition by loc_name order by t1 asc) Val_col from re where val1 > 0
) group by lname, Val_col
but I am getting the output like this for above query.
name start end
abc 10/29/2012 13:00 10/29/2012 13:00
abc 10/29/2012 13:05 10/29/2012 13:05
so.on.Firstly and most importantly do NOT store dates as char columns: that's what the DATE type is for.
Secondly, i'm not sure how you get your output from the input, particularly as your SQL contains 'partition by loc_name' which
doesn't even exist in your example table.
Why has the same name got two rows with those min/max times. Are you partitioning by val1?

Min and Max values from entire table

Hi,
i have requirement in which i need to find the min and max values from the entire table.
See the sample data
create table test
Sal1 int,
Sal2 int,
Sal3 int
insert into test values (100,700,5700)
insert into test values (200,3300,5300)
insert into test values (4400,1200,3500)
insert into test values (5400,5600,3100)
i want the output as 100 and 5700.. how can i achieve this in a single query. Please through some light on this topic..!
Thanking you in advance
Regards,
Balaji Prasad B
Balaji - BI Developer

Below is an example with a subquery for each of the queries Mohammad posted in order to return both min and max in a single result set.
SELECT ( SELECT MAX(Maxx) AS Maxx
FROM test UNPIVOT
( Maxx FOR E IN ( Sal1, Sal2, Sal3 ) ) AS unpvt
) AS Maxx
, ( SELECT MIN(Minn) Minn
FROM test UNPIVOT
( Minn FOR E IN ( Sal1, Sal2, Sal3 ) ) AS unpvt
) AS Minxx;
Dan Guzman, SQL Server MVP, http://www.dbdelta.com

QoS - Min and Max Thresholds

Hello Everyone,
I'm studying QoS and I'm wondering how does a Cisco Engineer find out what the best Minimum and Maximum Threshold rates are when using WRED?
Where would one find these values?
I'm under the impression that it requires a study that's based on the size of the queues, is that correct?
But then, I come to the conclusion that even if the queues are big enough, application critical data like (VOIP) would suffer from delay..
So, how do you calculate the min and max threshold values..
Thanks ahead of time..
PR

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Setting WRED parameters, for optimal performance, is (IMO) very tedious. Lots of variables involved.
For starters, it shouldn't normally be applied to traffic that's not rate-adaptive, such as VoIP.
It works best for multiple large bulk data transfer TCP streams that are using dropped packets for their principle flow control. Then it can be optimized to maximize their "goodput".
To answer your question, you might study RED literature, and its many variants, found on the Internet.
You also want to study, if you're not already very familiar, with how adaptive flow rate protocols, such as TCP, behave when packets are dropped. (With TCP also be mindful of the different "flavors", i.e. Tahoe, Reno, New-Reno, etc.)
If you have specific questions, post again to this thread, and I might be able to help.

Difference of value of a dimension based on min and max

Database: Oracle 10g
BO-BOXIr3
Let me explain the exact problem again.
As per the below code, I have the data in this format in my table:
Code:
Date              Site ID     KWH
1/2/2009 00:00     IN-1     22
1/2/2009 01:00     IN-1     28
1/3/2009 03:00     IN-2     25
1/3/2009 04:00     IN-2     46
1/4/2009 00:00     IN-3     28
1/4/2009 10:00     IN-3     34
1/5/2009 08:00     IN-4     31
1/5/2009 09:00     IN-4     55
1/5/2009 11:00     IN-4     77
1/6/2009 00:00     IN-5     34
Now want to build a report with following columns:
Site     Count     KWH
IN-1     2     6 (ex.-28-22)
IN-2     2     21
IN-3     2     6
IN-4     3     46 (ex.-77-31)
IN-5     2     34
SITE- distinct site name.
COUNT-count is number of repetitions of site id between min and max date.
KWH -(Delta between the min and max date)
To get the above result I have created 3 report from different queries since not able to get these al in a single report viz Count, Max Value and Min value. Well I have all these 3 reports or table on a single page.
Count-this report will give the count between the dates
Max Value-this report will give me the values of kwh for max dates for each site id
Min Value-this report will give me the values of kwh for min dates for each site id
Now want to create a single report based on these 3 reports which contains the column
Site|Count|KWH
IS IT POSSIBLE?
Or
Is it possible to build such report in a single one with all the required column which I mentioned?
The variables which I created to get the max & min dates,
Mx_dt= =Max([Query 2].[Hourly]) In ([Query 2].[SITE_ID])
Mn_dt= =Min([Query 3 (12)].[Hourly]) In ([Query 3 (12)].[SITE_ID])
For filtering on report used following variables:
if_st_mn=If([mn_dt])=[Hourly] Then "ok" Else "no"
if_st_mx =If([mx_dt])=[Hourly] Then "ok" Else "no"
will filter on "ok" to get the max and min date values.
rest of the variable in the snap are not usable.

Yes, you can do it in one report.
I created a sample report from efashion:
Year | Lines | Sales Revenue
2001 | Accessories | $250
2003 | Accessories | $550
2001 | City Skirts | $1050
2003 | City Skirts | $1150...........
Create 2 variables 1) Count and 2) Difference:
1) Count as formula - =Count([Lines]) In Report
2) Difference as formula - =Sum([Sales revenue]) Where (Max([Year]) In Report = [Year]) - Sum([Sales revenue]) Where (Min([Year]) In Report = [Year])
You can replace the formula with your report variables. Then just drag Site ID, Count and Difference variables to your report.
Thanks
Jai

Optimized query to find Min and max of a col in a table

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