Need help with select this range of months with flexible first date

Hi all

I am creating a selection range months (will be in a WITH clause), for a report view monthly data. But the first months start date may be any date. (Not necessarily the first date of the month)
Examples:

Report of input parameters:

Start date: 10/08/12
End of month: December 2012

I tried to build a SELECT that will list
Month_Start, Month_End
10/08/12, 10/31/12
11/01/12, 11/30/12
12/01/12, 31/12/12

OR
Month_Start, Next_Month
10/08/12, 11/01/12
11/01/12, 12/01/12
12/01/12, 01/01/13


End of the month being optional, if no select value lists only
10/08/12, 11/01/12


Details of database is Oracle
Oracle Database 11 g Enterprise Edition Release 11.1.0.7.0 - 64 bit Production
PL/SQL Release 11.1.0.7.0 - Production

My code is far
VARIABLE  P50_START_DATE  VARCHAR2 (10)
VARIABLE  P50_END_MONTH    VARCHAR2 (10)
 
EXEC  :P50_START_DATE  := '10/10/2012';
EXEC  :P50_END_MONTH   := '31/12/2012';
  
 
  SELECT  to_char(:P50_START_DATE) AS start_date
        ,  ADD_MONTHS( TRUNC(to_date(:P50_START_DATE,'DD/MM/YYYY'),'MONTH'), 1) AS next_month
  FROM dual
  union

   SELECT to_char(ADD_MONTHS( TRUNC(to_date(:P50_START_DATE,'DD/MM/YYYY'),'MONTH'), ROWNUM-1)) AS start_date
   ,      ADD_MONTHS( TRUNC(to_date(:P50_START_DATE,'DD/MM/YYYY'),'MONTH'), ROWNUM) AS next_month
   --, rownum
   from all_objects
   where
   rownum <= months_between(to_date(NVL(:P50_END_MONTH, :P50_START_DATE),'DD/MM/YYYY'), add_months(to_date(:P50_START_DATE,'DD/MM/YYYY'), -1))
   and rownum > 1
If I put the comment - on the line and rownum > 1, as
-- and rownum > 1
The result I get is
START_DATE                     NEXT_MONTH                

01/10/12                       01/10/12                  
01/11/12                       01/11/12                  
01/12/12                       01/01/13                  
10/10/2012                     01/11/12   
But when I try to remove the double off period (the first month) by restricting rownum, it do not return all the lines for the second selection at all. The result I get is:
START_DATE                     NEXT_MONTH                

10/10/2012                     01/11/12   
Can anyone tell what is wrong with the statement select?

Thank you very much in advance,
Ann

Queries line use:

SQL> VARIABLE  P50_START_DATE  VARCHAR2 (10)
SQL> VARIABLE  P50_END_MONTH    VARCHAR2 (10)
SQL>
SQL> EXEC  :P50_START_DATE  := '10/10/2012';

PL/SQL procedure successfully completed.

SQL> EXEC  :P50_END_MONTH   := '31/12/2012';

PL/SQL procedure successfully completed.

SQL> SELECT  CASE LEVEL
  2            WHEN 1 THEN TO_DATE(:P50_START_DATE,'DD/MM/YYYY')
  3            ELSE TRUNC(ADD_MONTHS(TO_DATE(:P50_START_DATE,'DD/MM/YYYY'),LEVEL - 1),'MM')
  4          END MONTH_START,
  5          LAST_DAY(ADD_MONTHS(TO_DATE(:P50_START_DATE,'DD/MM/YYYY'),LEVEL - 1)) MONTH_END
  6    FROM  DUAL
  7    CONNECT BY ADD_MONTHS(TO_DATE(:P50_START_DATE,'DD/MM/YYYY'),LEVEL - 1) <= TO_DATE(:P50_END_MONTH,'DD/MM/YYYY')
  8  /

MONTH_STA MONTH_END
--------- ---------
10-OCT-12 31-OCT-12
01-NOV-12 30-NOV-12
01-DEC-12 31-DEC-12

SQL>

SY.

Tags: Database

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    Any direction, assistance, similar facilities to sample, suggestions or resources that would help would be great. I did a lot of hunting, but still a little confused on how to best to put in place.

    You must think of VMDK files of large databases with records of random size guest go read some data (a DLL or an INI file), maybe write some data back, then go read other data. Some files are tiny, but certain DLLs are several megabytes. It's random i/o all and heavy on the search time. IO Opsys is small random operations that are often sequential (go read data, write data, go read other data,...) so that deadlines are critical to the overall performance. That's why people say OPS are / s of reference and forget the MBs flow. The only time where you bulk transfers are when you read media (ISO files).

    Well, now forget all this. Actually the disk activity will depend on the specific applications (database? mail server? machines compiler?), but the above is true for boots, and whenever applications are idle. You should see the profile to know.

    RAID 10 is faster (and often more reliable) than RAID 5 or RAID-6 except in certain specific cases. In General RAID 10 is ideal for many random writes, since the calculation of parity for RAID-5 and - 6 adds to the overall latency between command and response - latency is cumulative if a little slow here and a little slow it adds up to a lot of overall slow synchronous especially with e/s on a network. OTOH RAID-5 and -6 can produce faster readings due to the number of heads, so you can use it for virtual machines that transfer bulk. Test. You may find that you need several different types subdashboards for best results.

    You said 3ware, they have some good grades on their site, but don't believe it. With my 9650 that I found myself with only a couple of their recommendations-, I put the (simple) table for allocation size 256 k, nr_requests at 2 x the queue_depth and use the planner date limit. I had the habit for the Ext4 file system formatted with stride and stripe-width synced to the table and used the options large_files with fewer inodes (do not use the huge_files option unless you plan to have single VMDK files in the terabyte range). Use a cache of great reading in advance.

    Virtual machines use VMDK files in all cases except raw iSCSI LUN that they treat native disks. VMDK is easier to manage - you can make a backup by copying the file, you can move it to a PC and load it into another flavour of VMware, etc. There could be some features iSCSI to your San as a transparent migration but nothing for me. NFS has less chatter of Protocol if latency lower times to complete an operation. NFS is good to read and write a block of data, that's all it boils down to.

    UPS is good, but it won't help if something inside the machine explodes (UPS does nothing if the PC power supply goes down). If the RAID card has an option for a battery backup module, so it can contain some writings in memory and may end up the disk i/o after replacing the power supply. 3ware also limits the types of caching available if help is not installed, and you get just the right numbers with the module.

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