>>>>>We have an index that keep corrupting all the time. Even if I delete the table, rebuild it from scratch and recreate the indexes, the same index will eventually corrupt itself again. Allways the same index and allways the same table.
>>>>>
>>>>>Except for power failure or application shutdown in a middle of a write, what can cause this ? And how to avoid it ?
>>>>>
>>>>>TIA
>>>>
>>>>What is the index expression?
>>>
>>>It's a combined fields index : NO_PARTEN+DTOC(DTPREL)+STR(IDCARTE,2)
>>
>>Use DTOS instead of DTOC. I think DTOC function is not good as part of index expression as it's settings dependent.
>
>Thanks. We'll keep that in mind as a future project because it may cause a lot of changes in code, but I don't think it's the main cause here because we set all the environment in one place and every form, class, etc. use the same setting. So, SET CENTURY and SET DATE (for example) are only set once and never touched afterward.

And that might be your issue as there are some commands (i.e. SET DATE, SET HOURS) that are scoped to the current data session.