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Table Size

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    #16
    Re: Table Size

    Hi All

    Just an update to this post, my customer reached the 2,147,483,648 bytes limit sooner than expected. I managed to remove some old records and I have created a archive routine which is going to be applied this weekend.

    When the table reaches 2,147,483,648 bytes it just stops adding any more records to the table.

    so in conclusion the table limit is : 2,147,483,648 bytes
    what happens when it reaches : 2,147,483,648 bytes cannot add any more records

    Andy

    Comment


      #17
      Re: Table Size

      Originally posted by DaveM View Post
      Funny thing,

      I just took a 15 meg dbf file(packed) and split it into 2 tables, got rid of a couple fields that had never been used and now the 2 tables are under 10 megabytes. also to connect the 2 properly within sets I have 3 fields that are duplicates.

      Dave
      Hi Dave,

      I need some help here before I go down the wrong road.

      I have a set consisting 5 tables, typically count field of 30 and record size < 500. It somehow seemed easier to control smaller tables. However when i need to calculate in an emdebbed browse, I cannot use cross-table fields in the calculation, it seems as though all the fields required in the calculation ne to be in a single table. (?).

      Do you think it is better to have a single table even though it may have a field count of > 200 and record size > 1000 ? This will allow me to calculate as above. Or are there dangers in making a single large table ?

      Looking forward
      Dave Mac

      It's not so much what you don't know that gets you into trouble, but what you know for sure, that just ain't so. - Mark Twain.

      Comment


        #18
        Re: Table Size

        Is it possible to estimate how many records a table can hold before it might reach this limitation? IOW does the record size and number of records in the table determine the file size alone or is there also some other factor? Does a record with 10 fields of 10 characters each actually equal 100 bytes? I do know that even an empty file takes up 1 kb, but past that, how do you estimate this?
        Robin

        Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

        Comment


          #19
          Re: Table Size

          Each dbf file contains a fixed record size, so that most fields take up their width as described below.

          Memo, Blobs and Memo-like fields use a 10 byte pointer field in the dbf file
          Dates use 8 characters
          Long time uses 17 bytes
          Short time uses 8 bytes
          Logical uses 1 byte
          Character, Numbers use their width
          and 1 extra byte per record for the mark/delete record flag

          Compute the total size of the record (also displayed when modifying the structure) and multiple by the total # of records and add the header, which is limited to a maximum of 65535 bytes, but is more typically less than 512 bytes.

          That total size must be less than 2 Gigs.

          In addition, all bytes stored in the FPT (memo file) limit the size of the memo file to 2 Gigs as well (including older copies of each entry that were smaller than the current size of the memo entry)
          Last edited by csda1; 05-19-2008, 02:37 PM. Reason: Edited CDX to FPT
          Regards,

          Ira J. Perlow
          Computer Systems Design


          CSDA A5 Products
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            #20
            Re: Table Size

            Thanks Ira - I thought the CDX was for indexes? What constitutes the header value?
            Robin

            Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

            Comment


              #21
              Re: Table Size

              Hi Robin,

              My mistake. I meant FPT (which is the memo file as referred to in the text) and have corrected it on the posting.

              The dbf header has information on the number of records, and record structure (fields) and a few other miscellaneous info.
              Regards,

              Ira J. Perlow
              Computer Systems Design


              CSDA A5 Products
              New - Free CSDA DiagInfo - v1.39, 30 Apr 2013
              CSDA Barcode Functions

              CSDA Code Utility
              CSDA Screen Capture


              Comment


                #22
                Re: Table Size

                Robin,

                I "think" the "header" is the header of the dbf file. Names of the fields and stuff. I would think a cdx file would have something similar(not sure though). Try opening a dbf file with notepad and see what it looks like? CDX??


                .
                Dave Mason
                [email protected]
                Skype is dave.mason46

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