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Index Help

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    #1

    Index Help

    Hi

    I'm having a strange issue building new indexes on a table.

    When using the index builder I can build an index on some fields but not on others.

    Example: I can build an index on the Date_sold field but when I try to build it on the Date_ship field the index disappears from the index list in the builder.

    I have other indexes base on the date_ship field with other filters on them and no issues.

    So far I've identified 5 other fields in this table with the same problem.

    Please help

    Regards
    Tags: None
    #2
    Re: Index Help

    That usually means that the filter can't be evaluated correctly.

    Some examples would be good.

    It's hard to see what's going on without looking at the expression you are using.

    Is it possible that you have corrupted data in some records?
    Al Buchholz
    Bookwood Systems, LTD
    Weekly QReportBuilder Webinars Thursday 1 pm CST

    Occam's Razor - KISS
    Normalize till it hurts - De-normalize till it works.
    Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
    When we triage a problem it is much easier to read sample systems than to read a mind.
    "Make it as simple as possible, but not simpler."
    Albert Einstein

    http://www.iadn.com/images/media/iadn_member.png

    Comment

      #3
      Re: Index Help

      Hi Al,

      Thank you for your quick reply

      I've tried to build them with and without filters to no avail.

      The expressions in the order expressions is just the field name, nothing complex.

      Some fields are simple character fields and some are date fields, I've build other indexes on these fields and have no problems

      How would you test for corrupted data in a field?

      Comment

        #4
        Re: Index Help

        I have other indexes base on the date_ship field with other filters on them and no issues.
        Not pertaining directly to the issue of your index disappearing but it sounds as if you may be building unnecessary indexes.

        If you build a single index on date_ship including all records and later query the table with a filter expression involving that field, Alpha will use the index to speed up the query. It is seldom advisable to use a filtered index in place of a query.

        There is a limit of 40 indexes per table.
        There can be only one.

        Comment

          #5
          Re: Index Help

          Originally posted by K2kcc View Post
          Hi Al,

          Thank you for your quick reply

          I've tried to build them with and without filters to no avail.

          The expressions in the order expressions is just the field name, nothing complex.

          Some fields are simple character fields and some are date fields, I've build other indexes on these fields and have no problems

          How would you test for corrupted data in a field?
          I open a default browse and sort ascending and descending on each field. Bad data usually comes to the top or bottom of the list.

          Otherwise you need to add a field to the table and run an update where new_field = old_field and see if the new field gets all of the data into it.
          Al Buchholz
          Bookwood Systems, LTD
          Weekly QReportBuilder Webinars Thursday 1 pm CST

          Occam's Razor - KISS
          Normalize till it hurts - De-normalize till it works.
          Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
          When we triage a problem it is much easier to read sample systems than to read a mind.
          "Make it as simple as possible, but not simpler."
          Albert Einstein

          http://www.iadn.com/images/media/iadn_member.png

          Comment

            #6
            Re: Index Help

            Hi Stan,

            I'm using the filter on the index to filter records on a browse when the user initiates the browse. What started this was I tried to change the name if the index to make it easier for the user to find those records he needed. When I changed the name, it disappeared, from there I tried to build a new index using the old name and it disappeared as well. Which led me to investigate other fields in this table. Some worked and some didn't.

            There are only 15 indexes on this table and some are using the same fields I'm trying to create new indexes for yet alpha just keeps deleting the new indexes.


            For example, I have an index named Date, ordered on the Date_ship field and no filter. I also have an index named Today, ordered on the Date_ship field but has a filter set to filter records with current system date. Both indexes work fine but alpha won't let me build another index on the Date_ship field.

            Maybe I'm missing something but I find this very strange.

            Comment

              #7
              Re: Index Help

              Have you performed a database/workspace compact, restarted the machine, and tried again.

              In accordance with Al's suggestion. duplicate the table, all except records. Can you create indexes on the new empty table? If so, append 100 records from the original, still able to create indexes? Append another 100, repeat.
              Last edited by Stan Mathews; 05-15-2015, 12:59 PM.
              There can be only one.

              Comment

                #8
                Re: Index Help

                Hi Stan and Al,

                Thank you for your help

                I found a corrupted records in the date_ship field and in all the other fields that didn't work.

                It didn't show up when I sorted on the field but when I did a summary operation it was clear as day.

                Thank you again for your help in resolving this problem

                Regards,

                Comment

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