ORA-01409: NOSORT option may not be used; rows are not in
ascending order



ORA-01409: NOSORT option may not be used; rows are not in ascending order..

Answer / guest

Cause: Creation of index with NOSORT option when rows were
not ascending. For non-unique indexes the rowid is
considered part of the index key. Therefore, if you create
an index nosort and two of the rows in the table have the
same key and are stored in ascending order, but get split
accross two extents where the dba of the first block in the
second extent is less than the dba of the last block in the
first extent, then the create index nosort may fail.

Action: Create the index without the NOSORT option, or
ensure table is stored in one extent.

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