Why does Oracle not permit the use of PCTUSED with indexes?
Answer / Harish Kumar Yadav
Oracle does not allow the use of PCTUSED with indexes because it is intended for tables, not indexes. PCTUSED helps maintain space efficiency for tables by freeing unused blocks when they reach a specified threshold (PCTFREE). However, since indexes are used to locate data within tables and not to store data themselves, setting PCTUSED on an index would have no practical benefit.
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