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Why does my selection set disappear after I close and re-open my OLE DB table or text file?
Each time a nonOID table (no ObjectID field),, such as an OLE DB table or text file, is opened in ArcMap, a new locally cached version of the table is created. Any selection set defined on these tables, will therefore be lost when the table window is closed and re-opened. The new table will know nothing about selections sets defined on the old table.