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A5's use of RAM for Performance

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  • A5's use of RAM for Performance

    I am trying to process some very large files. These files are being imported and then are being appended to dbf tables. The files have about 50 million records and they are well below the 2 gig size limit of the dbf spec. This process is taking a very long time and switching to a SQL database backend is not an option at this time.

    One thing I can do is switch to a 64 bit OS machine with 8 gig of RAM and a quad-core processor. But I don't want to do this unless A5 is able to take advantage of the extra RAM.

    Does anyone know if the extra RAM would help?


  • #2
    Re: A5's use of RAM for Performance

    My experience moving from a 2 gig machine to a 4 gig machine says yes. It also didn't hurt to get a 10k drive in it.

    Anecdotal, not definitive.

    If you have multiple indexes defined for the table being appended to you should consider dropping them before the append and reinstating them afterwards. This can be done with xbasic. Not having to update the index for every record appended will speed up the process. Then the appended to table gets a one time reindex.
    There can be only one.


    • #3
      Re: A5's use of RAM for Performance

      unless A5 is able to take advantage of the extra RAM
      I don't believe Alpha has anything to do with how the ram is allocated. The question is whether your motherboard can utilize the 8 gb of ram (along with, of course having a 64 bit system)....and how well it does it. The operating system has a bit to do with it as well, but only having 8 gb should not be a problem for any current OS.

      Perhaps you are thinking of how Alpha handles more than one core? I have read threads on it but still think the jury is out on how Alpha utilizes it---again here though, much depends upon how the OS can utilize the multi-cores.

      That said, I agree with Stan about the more than likely benefit of increasing your ram--I experienced a significant gain in my current 32 bit system when going from 2 to 3 gb of ram which is just below the maximum. And I need more so soon will be upgrading by purchasing a new PC with 8gb.
      It is only when we forget all our learning that we begin to know.
      It's not what you look at that matters, it's what you see.
      Henry David Thoreau


      • #4
        Re: A5's use of RAM for Performance

        I don't believe anything beyond 3.5 gig matters unless you have a 64 bit system. If you're still running XP, don't bother going beyond about 3.5 gig. (OK, that usually means installing 4 gig but XP only uses about 3.5)

        Oops, I guess you sorta said that in the "(along with, of course, having a 64 bit system)".


        • #5
          Re: A5's use of RAM for Performance


          My Motherboard can only "use" 4 gb. My 32 bit XP is limited to I believe 3.18 gb due to not just the 32 bit but also the inherent loss of my specific video card (even external vid cards utilize/tie up some of the available memory). The max I have heard is about 3.25 gb of ram actually being of use. Considering this, it did not pay to have more than the 3 gb installed (if it could have used 3.5 gb I may have got 4 gb of ram for it).

          BTW there almost always has been a 64 bit XP that could be purchased, but it had/has many flaws that have been taken care of now in Vista and Windows7 64 bit systems which is what I consider a current OS.

          (Still waiting for a decent deal on my new system---have to buy two so worth the wait--wife wants one too now!)
          It is only when we forget all our learning that we begin to know.
          It's not what you look at that matters, it's what you see.
          Henry David Thoreau