Purpose of SPARE field in OBJ$

I'm trying to document the tables in our database. Initially, I thought of creating a table with descriptions linked to OBJ$, but noticed that OBJ$ has fields labled SPARE1 to SPARE6.
Does anyone know what (if any) purpose these field have and whether or not it would cause a problem if I use SPARE5 or SPARE6 (varchar fields) to store a description of each table?
Thanks

This is a bad idea.
Updating of the tables owned by SYS should only be done through recursive SQL by Oracle commands. E.g. to change a name of a table, use RENAME instead of updating SYS.TAB$ directly. I'm pretty sure that if you tell Oracle support that you are updating SYS tables directly they will answer that they can't guarantee to fix any database problems you may have.
There is a way to put descriptions on tables and columns in the data dictionary. Look in the manual for the COMMENTS command.
The best way to try to figure out the use of the columns in the SYS table is to look at the source code of the corresponding DBA_ view. e.g. for OBJ$ look at the source code of DBA_OBJECTS. For IND$ look at the source code of DBA_INDEXES.
If a SYS table column is not mentioned in a DBA_ view, that doesn't mean that the column serves no purpose.
Even if you think you know for sure that the column serves no purpose (for example, in my small 8.1.7 test database, I see that some of the SPAREn columns in OBJ$ have data, others seem to be always null), that could be because you are not using the particular Oracle feature that would update that column.
Why not, instead, create your own description table and put descriptions in there, if the COMMENTS command does not fit your needs?

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Way to find purpose of individual field

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The above columns represent all the available columns that can be imported using the standard contact import feature. Columns do not need to contain information but they must be present on the page, especially if a proceeding column contains information.
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Edited by: Derek Xu on Apr 30, 2009 6:50 PM

Hi Derek,
Thanks for writing your thoughts. I would like to provide some information on one of your points where in you have mentioned that :
You import file must have BOTH values (index/ID and the name/description fields) in the source, in order to Automap. If your source file only has 1 field, like in MECCM when extracting ECC contract, ONLY the Supplier ID, or Category ID is extracted, Automap is not possible.
I completely agree that if you have 2 fields in MDM repository and you are only importing only one of them, then you cannot use the Automap feature of Import Manager. So in your case, the description is not getting importing, so you cannot use Automap in that case.
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SAP-MDM Automatic Import Requirement u2013 Creation of a Value Mapping Template:
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/80ad0cff-19ef-2b10-54b7-d4c7eb4390dd
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I have mentioned examples of descriptions and their respective fields in the article.
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