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Index Skips Record

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    #1

    Index Skips Record

    I am having a problem with a table sorted by file number. When I do a find by key in any of my forms, certain records (three or four out of about 1,000 records in the table) are not found. Instead, the following record in the index is found and I have to page up to see the previous record, the one I was looking for. There is no problem with the rest of the records in the table, just those specific three or four records. There is no consistency that I can detect to the records that don't work (similar numbers, spaced evenly throughout the table, etc.)

    This happens on all forms I create, even a test form with only the field number record. It does not happen if I'm using the default browse or default form (but if I create a form based on the default form, it does happen).

    The problem persists even if I rebuild the indexes or create a new index on file number.

    Does anybody have any suggestions as to what might be happening? Thanks.
    Tags: None
    #2
    RE: Index Skips Record

    Post some examples of finds that work and finds that don't and maybe we can offer specific help.

    In the meantime, if I were having this trouble I'd check the definition of the index to see how the index key is formatted. I'd especially watch for leading or trailing blank spaces. Then I'd check the key field in the 'troublesome' records. Is it formatted *exactly* as your key, or does it have leading blanks which are interfering with the find?

    -- tom

    Comment

      #3
      RE: Index Skips Record

      The file number field is a seven-character field that includes the last two digits of the current year as the first two characters with the remaining five numbers used to number the files consecutively throughout the year.

      Some indexes take into account the Y2K problems of this numbering format (format was created before A5 application) by adding "20" in front of the number if the first two characters of the field are less than "80" and adding "19" if the first two characters is "80" or more. Some indexes, however, are based solely on the 7-character file number field. For instance, File_No is sorted by File number with no filters; Activefile is sorted by File number, filtering out inactive records.

      If I do a Find by Key for 0001191 with the Activefile index active, record 0001196 is displayed (the first active file after 0001191). If I do a Find by Key for 0001191 with the File_No index active, record 0001192 is displayed. Paging up after running the find takes me to 0001191. (But if I do the same while looking at the default form, the correct record is displayed immediately).

      However, if a do a Find by Key for 0001190 or 0001196 with either index active, the correct record is displayed.

      Comment

        #4
        RE: Index Skips Record

        Any chance you could post a sample set of records and indexes from your database?

        It sounds as though the find by key is failing on the actives file... or the form is itself moving the record pointer when a record is fetched...

        The latter might explain why the default form works, but your real form does not.

        -- tom

        Comment

          #5
          RE: Index Skips Record

          Once in a great while I have this problem with some customers. In most cases, I can solve it by deleting the CDX file and re-creating the index. Apparently, that file can get corrupted somehow.

          Here's a script I use to update indexes, which will also create a new index when you delete the CDX:

          tbl = table.open("activity")
          index_create_begin("Actid", "ACTID", "", "I")
          index_add("Id", "ID", "", "I")
          index_add("ACT_U", "Actid", "", "U")
          tbl.index_create_end()

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            #6
            RE: Index Skips Record

            Thanks, Tom, for your help. In trying to narrow out the unnecessary files so I'd only post the applicable files, I think I discovered my problem. I forgot to mention that the forms were based on a set and apparently the problem was at the grandchild level, where an index I hadn't even considered had become corrupted. Thanks again for looking at the problem.

            Comment

              #7
              RE: Index Skips Record

              Thanks, Bill. Before I saw your message I came to the same conclusion (it was just an index in a grandchild table that I hadn't even considered). Thanks for the poiner about re-creating the indexes also.

              Comment

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