Which structure of itab has a better performance

Hi experts,
I have written an ABAP-Report - the performance was good...
Then I must implement "some" more functions which were not requested at the beginning
and now the performance is very bad !!!
In this case I think a new report is the better way than a refactoring of the source code...
Now I am not sure how to organize my data in itabs.
I need a dynamic internal table cause number of key columns is only known at runtime...
What do you think is the better and faster way:
Alternative A:
Structure of itab
-  Assuming 5 key columns ( Key01, Key02, Key03,... )
-  4 further columns
estimated lines: 6.000.000 - much smaller linesize than Alternative B
Alternative B:
Structure of itab
-  Assuming 5 key columns ( Key01, Key02, Key03,... )
-  100 further columns
estimated lines: 80.000 - much bigger linesize than Alternative B
I think Alternative B would be faster but I want know your opinion...
Regards,
Oliver

First of all yolu should check the total size of your internal table,
no of lines *  bytes of the structure =   ?
And of course you should either a sorted table or a hashed table!  Standard tables should definitely be avoided here!
Hashed tables are only usefull with the complete unique table key, no other access!!!
+ If a hashed tables can be used then A could actually be better than B!
Use Assigning !!!
kind regards    Siegfried

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    510     events in waitclass Other     30670     9161     329759     10.75     196     3297590639     1736664284     1893977003     0     Other
    512     events in waitclass Other     32428     10920     329728     10.17     196     3297276553     1736664284     1893977003     0     Other
    243     events in waitclass Other     21513     5     329594     15.32     196     3295935977     1736664284     1893977003     0     Other
    223     events in waitclass Other     21570     52     329590     15.28     196     3295898897     1736664284     1893977003     0     Other
    241     row cache lock     1273669     0     42137     0.03     267     421374408     1714089451     3875070507     4     Concurrency
    241     events in waitclass Other     614793     0     34266     0.06     12     342660764     1736664284     1893977003     0     Other
    241     db file sequential read     13323     0     3948     0.3     13     39475015     2652584166     1740759767     8     User I/O
    241     SQL*Net message from client     7     0     1608     229.65     1566     16075283     1421975091     2723168908     6     Idle
    241     log file switch completion     83     0     459     5.54     73     4594763     3834950329     3290255840     2     Configuration
    241     gc current grant 2-way     5023     0     159     0.03     0     1591377     2685450749     3871361733     11     Cluster
    241     os thread startup     4     0     55     13.82     26     552895     86156091     3875070507     4     Concurrency
    241     enq: HW - contention     574     0     38     0.07     0     378395     1645217925     3290255840     2     Configuration
    512     PX Deq: Execution Msg     3     0     28     9.45     28     283374     98582416     2723168908     6     Idle
    243     PX Deq: Execution Msg     3     0     27     9.1     27     272983     98582416     2723168908     6     Idle
    223     PX Deq: Execution Msg     3     0     25     8.26     24     247673     98582416     2723168908     6     Idle
    510     PX Deq: Execution Msg     3     0     24     7.86     23     235777     98582416     2723168908     6     Idle
    243     PX Deq Credit: need buffer     1     0     17     17.2     17     171964     2267953574     2723168908     6     Idle
    223     PX Deq Credit: need buffer     1     0     16     15.92     16     159230     2267953574     2723168908     6     Idle
    512     PX Deq Credit: need buffer     1     0     16     15.84     16     158420     2267953574     2723168908     6     Idle
    510     direct path read     360     0     15     0.04     4     153411     3926164927     1740759767     8     User I/O
    243     direct path read     352     0     13     0.04     6     134188     3926164927     1740759767     8     User I/O
    223     direct path read     359     0     13     0.04     5     129859     3926164927     1740759767     8     User I/O
    241     PX Deq: Execute Reply     6     0     13     2.12     10     127246     2599037852     2723168908     6     Idle
    510     PX Deq Credit: need buffer     1     0     12     12.28     12     122777     2267953574     2723168908     6     Idle
    512     direct path read     351     0     12     0.03     5     121579     3926164927     1740759767     8     User I/O
    241     PX Deq: Parse Reply     7     0     9     1.28     6     89348     4255662421     2723168908     6     Idle
    241     SQL*Net break/reset to client     2     0     6     2.91     6     58253     1963888671     4217450380     1     Application
    241     log file sync     1     0     5     5.14     5     51417     1328744198     3386400367     5     Commit
    510     cursor: pin S wait on X     3     2     2     0.83     1     24922     1729366244     3875070507     4     Concurrency
    512     cursor: pin S wait on X     2     2     2     1.07     1     21407     1729366244     3875070507     4     Concurrency
    243     cursor: pin S wait on X     2     2     2     1.06     1     21251     1729366244     3875070507     4     Concurrency
    241     library cache lock     29     0     1     0.05     0     13228     916468430     3875070507     4     Concurrency
    241     PX Deq: Join ACK     4     0     0     0.07     0     2789     4205438796     2723168908     6     Idle
    241     SQL*Net more data from client     6     0     0     0.04     0     2474     3530226808     2000153315     7     Network
    241     gc current block 2-way     5     0     0     0.04     0     2090     111015833     3871361733     11     Cluster
    241     enq: KO - fast object checkpoint     4     0     0     0.04     0     1735     4205197519     4217450380     1     Application
    241     gc current grant busy     4     0     0     0.03     0     1337     2277737081     3871361733     11     Cluster
    241     gc cr block 2-way     1     0     0     0.06     0     586     737661873     3871361733     11     Cluster
    223     db file sequential read     1     0     0     0.05     0     461     2652584166     1740759767     8     User I/O
    223     gc current block 2-way     1     0     0     0.05     0     452     111015833     3871361733     11     Cluster
    241     latch: row cache objects     2     0     0     0.02     0     434     1117386924     3875070507     4     Concurrency
    241     enq: TM - contention     1     0     0     0.04     0     379     668627480     4217450380     1     Application
    512     PX Deq: Msg Fragment     4     0     0     0.01     0     269     77145095     2723168908     6     Idle
    241     latch: library cache     3     0     0     0.01     0     243     589947255     3875070507     4     Concurrency
    510     PX Deq: Msg Fragment     3     0     0     0.01     0     215     77145095     2723168908     6     Idle
    223     PX Deq: Msg Fragment     4     0     0     0     0     145     77145095     2723168908     6     Idle
    241     buffer busy waits     1     0     0     0.01     0     142     2161531084     3875070507     4     Concurrency
    243     PX Deq: Msg Fragment     2     0     0     0     0     84     77145095     2723168908     6     Idle
    241     latch: cache buffers chains     4     0     0     0     0     73     2779959231     3875070507     4     Concurrency
    241     SQL*Net message to client     7     0     0     0     0     51     2067390145     2000153315     7     Network
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    223     835     PX Deq Credit: send blkd     sleeptime/senderid     268697599     000000001003FFFF     passes     1     0000000000000001     qref     0     00     1893977003     0     Other     0     10     WAITING
    241     22819     row cache lock     cache id     13     000000000000000D     mode     0     00     request     5     0000000000000005     3875070507     4     Concurrency     -1     0     WAITED SHORT TIME
    243     747     PX Deq Credit: send blkd     sleeptime/senderid     268697599     000000001003FFFF     passes     1     0000000000000001     qref     0     00     1893977003     0     Other     0     7     WAITING
    510     10729     PX Deq Credit: send blkd     sleeptime/senderid     268697599     000000001003FFFF     passes     1     0000000000000001     qref     0     00     1893977003     0     Other     0     2     WAITING
    512     12718     PX Deq Credit: send blkd     sleeptime/senderid     268697599     000000001003FFFF     passes     1     0000000000000001     qref     0     00     1893977003     0     Other     0     4     WAITING
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    223     0     5779     5741     0     0
    241     38773810     2544298     15107     27274891     0
    243     0     5702     5688     0     0
    510     0     5729     5724     0     0
    512     0     5682     5678     0     0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

  • I need better performance from my computer. Could someone point me in the right direction?

    I do a lot of video editing for work. I am currently using the Creative Cloud, and the programs I use most frequently are Premiere Pro CS6, Photoshop CS6, and Encore. My issue is that when I am rendering video in Premiere Pro, and most importantly, transcoding in Encore for BluRay discs, I am getting severe lag from my computer. It basically uses the majority of my computer's resources and doesn't allow me to do much else. This means, that I can't do other work while stuff is rendering or transcoding. I had this computer built specifically for video editing and need to know which direction to go in for an upgrade to get some better performance, and allow me to do other work.
    For the record, I do have MPE: GPU Acceleration turned ON, and I have 12GBs of RAM alloted for Adobe in Premiere Pro's settings, and 4GBs left for "other".
    Here is my computer:
    - Dell Precision T7600
    - Windows 7 Professional, 64-bit
    - DUAL Intel Xeon CPU E-2620 - 2.0GHz 6-core Processors
    - 16GBs of RAM
    - 256GB SSD as my primary drive. This is where the majority of my work is performed.
    - Three 2TB secondary drives in a RAID5 configuration. This is solely for backing up data after I have worked on it. I don't really use this to work off of.
    - nVidia Quadro 4000 2GB video card
    When I am rendering or transcoding, my processor(s) performance fluctuates between 50%-70%, with all 12 cores active and being used. My physical memory is basically ALL used up while this is happening.
    Here is where I am at on the issue. I put in a request for more RAM (32GBs), this way I can allot around 25GBs of RAM to the Adobe suite, leaving more than enough to do other things. I was told that this was not the right direction to go in. I was told that since my CPUs are working around 50-70%, it means that my video card isn't pulling enough weight. I was told that the first step in upgrading this machine that we should take, is to replace my 2GB video card with a 4GB video card, and that will fix these performance issues that I am having, not RAM.
    This is the first machine that has been built over here for this purpose, so it is a learning process for us. I was hoping someone here could give a little insight to my situation.
    Thanks for any help.

    You have a couple of issues with this system:
    Slow E5-2620's. You would be much better off with E5-2687W's
    Limited memory. 32 GB is around bare minimum for a dual processor system.
    Outdated Quadro 4000 card, which is very slow in comparison to newer cards and is generally not used when transcoding.
    Far insufficient disk setup. You need way more disks.
    A software raid5 carries a lot of overhead.
    The crippled BIOS of Dell does not allow overclocking.
    The SSD may suffer from severe 'stable state' performance degradation, reducing performance even more.
    You would not be the first to leave a Dell in the configuration it came in. If that is the case, you need a lot of tuning to get it to run decently.
    Second thing to consider is what source material are you transcoding to what destination format? If you start with AVCHD material and your destination is MPEG2-DVD, the internal workings of PR may look like this:
    Convert AVCHD material to an internal intermediate, which is solely CPU bound. No GPU involvement.
    Rescale the internal intermediate to DVD dimensions, which is MPE accelerated, so heavy GPU involvement.
    Adjust the frame rate from 29.97 to 23.976, which again is MPE accelerated, so GPU bound.
    Recode the rescaled and frame-blended internal intermediate to MPEG2-DVD codec, which is again solely CPU bound.
    Apply effects to the MPEG2-DVD encoded material, which can be CPU bound for non-accelerated effects and GPU bound for accelerated effects.
    Write the end result to disk, which is disk performance related.
    If you export AVCHD to H.264-BR the GPU is out of the game altogether, since all transcoding is purely CPU based, assuming there is no frame blending going on. Then all the limitations of the Dell show up, as you noticed.

  • Why do I often get significantly better performance out of the integrated GFX on the new MBP 15"?

    I have the new lower-end 15" MBP. I have never once experienced a time where the discrete GPU outperformed the "HD Graphics 3000". Just the opposite, in fact. On a particular itunes visualizer, I get around 55fps with the integrated GFX, and around 32 with discrete. When playing games from The Orange Box, I get 90-140fps on integrated gfx and 30-50 on discreet. These are the only specific benchmarks I have, but I have noticed the same trend elsewhere too. Is there something wrong with my computer, or is this the norm?

    wyager wrote:
     @ds_storeI thought the HD 3000 didn't really have any RAM, but it could borrow 384 megs from the system RAM?
    Yes the HD 3000 uses main memory where programs and working files are stored, assuming the 384MG is assigned when the machine boots up. If one places more RAM in their machine, there is the possibility that more memory could be used by the HD 3000.
    With about 11 on the OpenGL for the dual core with HD 3000, the quad core with HD 3000 might be around 22 or so on the OpenGL which might be just around as fast as the descrete Radeon 6490M. (which is a poor card BTW)
    If certain programs were optimized for the HD 3000 by default, yea sure on this machine it's looking like certain programs may be faster on the HD 3000 than on the descrete card.
    wyager wrote:
    I understand if the HD 3000 gfx performs better at encoding/decoding video, it has a whole new instruction set for that, but it seems like if it performs this well all around, apple shouldn't have wasted the space for the discrete card...
    It's looking with the low end 15" one has the same performance on either, all depends upon the software if it's written for integrated or descrete graphics.
    Some 3D games won't run unless it has a descrete video card, what's the use.
    You can see here though, descrete graphics is way ahead of integrated graphics
    http://www.cbscores.com/index.php?sort=ogl&order=desc

  • Please help to modifiy this query for better performance

    Please help to rewrite this query for better performance. This is taking long time to execute.
    Table t_t_bil_bil_cycle_change contains 1200000 rows and table t_acctnumberTab countains  200000 rows.
    I have created index on ACCOUNT_ID
    Query is shown below
    update rbabu.t_t_bil_bil_cycle_change a
       set account_number =
           ( select distinct b.account_number
             from rbabu.t_acctnumberTab b
             where a.account_id = b.account_id
    Table structure  is shown below
    SQL> DESC t_acctnumberTab;
    Name           Type         Nullable Default Comments
    ACCOUNT_ID     NUMBER(10)                            
    ACCOUNT_NUMBER VARCHAR2(24)
    SQL> DESC t_t_bil_bil_cycle_change;
    Name                    Type         Nullable Default Comments
    ACCOUNT_ID              NUMBER(10)                            
    ACCOUNT_NUMBER          VARCHAR2(24) Y    

    Ishan's solution is good. I would avoid updating rows which already have the right value - it's a waste of time.
    You should have a UNIQUE or PRIMARY KEY constraint on t_acctnumberTab.account_id
    merge rbabu.t_t_bil_bil_cycle_change a
    using
          ( select distinct account_number, account_id
      from  rbabu.t_acctnumberTab
          ) t
    on    ( a.account_id = b.account_id
           and decode(a.account_number, b.account_number, 0, 1) = 1
    when matched then
      update set a.account_number = b.account_number

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