>>>>Hi,
>>>>
>>>>I have not used the REINDEX command in a very long time. And I am getting a lot of problems related to the application not being able to read some .cdx files. These CDX files are part of the SFQUERY and SDT and I don't know the structure of the indexes. So, just to be sure that the problem is not with a corrupted index, I thought I would reindex these DBFs.
>>>>I am thinking of simply executing the following command:
>>>>
>>>>

>>>>use SDTMETA
>>>>REINDEX
>>>>

>>>>
>>>>And the same with a couple of other meta DBFs. Is the above safe?
>>>
>>>It depends on the nature of the index corruption / error. I've observed some odd errors that can only be corrected by physically deleting the CDX and recreating it. In other cases, completely dropping the TAG and re-creating it.
>>>
>>>In general, REINDEX will always work properly, but if the index is corrupted it won't always correct it.
>>>
>>>It's better to use ATAGINFO() and construct the INDEX ON commands, then DROP TAG ALL, delete the CDX, and then rebuild each tag from scratch.
>>
>>Since I don't know what specific tags the CDX is built on, my only option was to REINDEX. Which I did.
>>Thank you.
>
>If it's damaged, you may still be able to salvage that information. The CDX has a particular internal structure and you you may be able to navigate through it and recover some of that information. If you ever have a damaged CDX and you would like to see if that information is recoverable, let me know.

Thank you, Rick. So far, since REINDEX worked, I don't suppose the CDX was/is damaged. And if absolutely necessary, I could ask Doug Hennig (who is the author of the SDT) for the tags of the CDX file.