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Erased indexes

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    Erased indexes

    I am currently using Alpha 5 v4. We are using the 5 license network version. Each day my office manager rebuilds the indexes at the beginning of the day. We are currently experiencing a problem with the whole index list for a table being eradicated for no apparent reason. I have currently found no pattern as to when this happens. Anyone know what causes this?!? I am completely perplexed!

    #2
    RE: Erased indexes

    Hello Scott,

    If Alpha has a problem evaluating an index, it will 'remove' it. Alpha tends to want to deal with a lot of the indexes 'automatically', creating them on the 'fly' so to speak. If your coming from a background in A4, where we had to specifically define an index for any linking or procedures that depended upon the index, A5 is different in that it will create the index for us when we define a link or expression that calls for one. My guess is that you've got a problem with your index definitions. Something is apparently tripping Alpha up when it tries to evaluate the index. Keep your indexes simple, as much as possible, stay away from filtered indexes. Don't base you index on a variable value. Try as much as possible to have your index expressions based in fields in the table.

    Especially in version 4.5, I've found indexes to be quite stable.

    Jim

    Comment


      #3
      RE: Erased indexes

      Scott,

      Are all the indexes erased or only some of them?

      Despite the warnings, I use filtered indexes, but whenever there are problems, just the filtered ones get erased. This only happens every 6 months or so...not every day.

      The most common reason an index is erased is because it excludes deleted records and some operation is creating a lot of deleted records at one time. Look there first.

      A second good idea is to keep the index name short: 8 characters or less, with no spaces. In particular a series of indexes where the difference in beyond 8 characters, such as "My index number 1", "My index number 2" and so on, will cause trouble.

      Good hunting!
      Pat Bremkamp
      MindKicks Consulting

      Comment


        #4
        RE: Erased indexes

        Pat,

        Actually the best length limit is 10 characters. Any more that that is stored in the data dictionary. If that gets corrupted, Alpha will truncate every index name to 10 characters. Then any script or cammand looking for the original name won't be able to find the index and it will appear "lost"

        The only time I have actually lost indexes is when the index has a filter and for some reason the filter or index expression won't evaluate. I try to severly limit the use of filtered indexes.

        Jerry

        Comment


          #5
          RE: Erased indexes

          Interestingly enough, I may have experienced the same problem recently. (But, the jury is still out.)

          A long time customer has had [email protected] the indexes disappear twice recently.

          Comment


            #6
            RE: Erased indexes

            Oops! Hit the wrong button!

            Interestingly enough, I may have experienced the same problem recently. (But, the jury is still out.)

            A long time customer has had all the indexes disappear twice recently. There has been a significant amount of application updating going on so I can't be absolutely sure what is happening but I left on Thursday at 2 PM, while the users were actively updating/adding records, and everything was OK. Today, Friday, none of the 8-10 indexes was available. There were only two indexes and these were obviously created automatically by Alpha.

            One of these indexes uses a very simple filter (Status = "Approved") but the rest have no filter and are set to "All", "Ascending". All the index definitions have been in use for years (8?) but... the table was recently renamed and restructured; plus, some of the index names were changed to match my latest naming methods.

            Luckily, I have an automatic index rebuilding routine built into the application so it isn't a big deal. I've never fully trusted the "Update Production Indexes" just because of this possibility - if you lose an index (or 2 or 10) then there isn't anything to update!

            This is the second time in about a week that this seems to have occurred. If I find out what's causing it, I'll post it here.

            Cal

            Comment


              #7
              RE: Erased indexes

              Dear Jerry,
              All of my indexes are ten characters or less. I only have one filtered index that I no longer use. I will remove it and see if it helps. It also seems this happens when I have 5 users on at once, although not all the time. This leads me to wonder how stable the network version trully is. Sometimes it seems as if there is a phantom. Let me know what you think.....Thanks!!

              Comment


                #8
                RE: Erased indexes

                Scott,

                I can cause alpha to erase my indexes at will. The indexes can be simple and less than 3 characters long.

                If I make up my incdexes and then duplicate them in a filter just right on a form, they wipe out.

                I have written this before on here but don't remember the exact scenario. Please check the filters on your forms!

                Dave

                Comment


                  #9
                  RE: Erased indexes

                  I found it

                  One very quick way to empty your indexes is to have a filter in an Index and then have the same filter for a form. As soon as you try to choose a new index, all is gone from your indexes and will have to be rebuilt.

                  I do use filters in my indeexes, but only 1 per index and very simple ones at that.

                  Dave

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