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strange problem - any thoughts?

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    #1

    strange problem - any thoughts?

    I have experienced the problem described below only occasionally, but it seems to recur so I thought I would ask for any thoughts.

    Every now and then, one of the tables in my app appears for a while to have lost data in a group of records. This usually happens to (or at least I notice it)a table with an auto-increment field used for id numbers. It becomes noticable when the auto-increment field starts over at "1". At this point, I open the default browse for the affected table, switch to record number order, and move to the end of the table. If I "page-up," several screens of what look like completely blank records appear (logical fields display a defalut value). If I copy the affected table (using NT Explorer) to my local hard drive, all the records appear normally. I then rename the production copy of the table (the affected one that I have just copied from) to something like "myTable_bad.dbf", and copy the copy back into its place. This solves the problem. Within a day or two, the original copy of the table ("myTable_bad.dbf") no longer has the problem - i.e. all of the records that appeard to contain no data now appear correctly.

    The production copy of this app exists on a Novell network, and the problem appears irregularly - about once a month. Some of the tables in the app include lots of records (over a million in a couple of cases), but the problem affects both big tables and relatively small ones. (The latest occurance was with a table with about 40,000 records.) I am running A5v4.

    My guess is that I am experiencing some form of partial fragmentation of the .dbf files (because copying the file to a new location seems to solve the problem). But any thoughts on this would be helpful. Thanks,

    -Bill
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    #2
    RE: strange problem - any thoughts?

    Here are some thoughts, although nothing definitive:

    I had this happen on a table that I later discovered had some corrupted data in it. I was able to fix it by appending the data to another table with the same structure.
    The bad data didn't append, but showed up in VIOLATIONS, so I was able to see what was bad.

    I've also seen this happen when the indexes became unstable (not sure why), where rebuilding them didn't help. I had to delete the CDX files and recreate the indexes (I have a script that does this, so it wasn't too bad).

    I hope this helps somewhat.

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      #3
      RE: strange problem - any thoughts?

      Thanks for the reply. I have tried variations on what you suggest, but will try again in a more methodological way.

      -Bill

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