Change Data type column - Performance of Index in Oracle 10g

Hi,
I have a table with too many rows (over 2000000 rows) . I have changed datatype (NUMBER to VARCHAR2) of an indexed column (the index is only for this column), using a temporay backup table:
CREATE TABLE BKTABLE AS SELECT FIELD, ROWID AS IDROW FROM ORIGNALTABLE;
UPDATE ORIGNALTABLE SET FIELD = NULL;
ALTER ORIGNALTABLE MODIFY FIELD VARCHAR2(256);
UPDATE ORIGNALTABLE A SET FIELD = (SELECT FIELD FROM BKTABLE B WHERE B.IDROW = A.IDROW);
This way worked OK.
There is any performance knowed issue over an index of ORIGNALTABLE? Need rebuild this index?
Thks!

Need rebuild this index? YES
ALWAYS
Post Operating System (OS) name & version for DB server system.
Post results of
SELECT * from v$version
or post Oracle version to 4 decimal places

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===================
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