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I have a file geodatabase with 20 feature classes and I need to delete a few of them, but the option to DELETE in ArcCatalog, if I select this feature class, and click right mouse, is disabled for the most of the feature classes in the file geodatabase.

Why is the reason for that? Can I fix it? This file geodatabase is created by xmlscheme of gdb.

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Are they open in ArcMAP? – Ian May 8 '12 at 7:43
Nope. Just in arc catalog. – Z77 May 8 '12 at 7:44
do you see any lock files in the .gdb file folder? – Kirk Kuykendall May 8 '12 at 12:57
Do you have any map services consuming those fc? – artwork21 May 8 '12 at 15:53
Probably a lock (an opened reference to the dataset) or as @RyanDalton points out, it is compressed – Ragi Yaser Burhum May 8 '12 at 15:55

2 Answers 2

In this case, the solution was to remove feature classes from a topology in which they were participating before they could be deleted from the geodatabase.

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A topology was not mentioned in your original question. Including such important details would have more quickly led to the answer :) – blah238 May 9 '12 at 8:23
Ok. I did not know that:) But now I know :) We are here to learn :) – Z77 May 9 '12 at 8:35

Perhaps the file geodatabase is compressed.

Once compressed, a feature class or table is read-only and cannot be edited. Compression is ideally suited to mature datasets that do not require further editing. However, if required, a compressed dataset can always be uncompressed to return it to its original, read-write format.

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