Max(serial_no) on a big table

Hello Gurus,
I am using max(serial_no) on a big table
how to get performance of such query
SELECT MAX(SERIAL_NO) FROM DOCUMENTS agr WHERE STATUS NOT IN ('A', 'NA');
| Id | Operation | Name | Rows | Bytes | Cost |
| 0 | SELECT STATEMENT | | 1 | 8 | 5250 |
| 1 | SORT AGGREGATE | | 1 | 8 | |
| 2 | TABLE ACCESS FULL | DOCUMENTS | 846K| 6613K| 5250 |
No index onn STATUS column
thanks in advance

NOT IN does not consider index.I wouldn't say so generally
SQL> explain plan
   for
      select max (empno)
        from emp
       where empno not in
                (7369,
                 7499,
                 7521,
                 7566,
                 7654,
                 7698,
                 7782,
                 7788,
                 7839,
                 7844,
                 7876,
                 7900)
Explain complete.
SQL> select * from table (dbms_xplan.display ())
PLAN_TABLE_OUTPUT
Plan hash value: 1767367665
| Id | Operation                   | Name   | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT            |        |     1 |     4 |     2   (0)| 00:00:01 |
|   1 | SORT AGGREGATE             |        |     1 |     4 |            |          |
|   2 |   FIRST ROW                 |        |     1 |     4 |     2   (0)| 00:00:01 |
|* 3 |    INDEX FULL SCAN (MIN/MAX)| PK_EMP |     1 |     4 |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   3 - filter("EMPNO"<>7369 AND "EMPNO"<>7499 AND "EMPNO"<>7521 AND
              "EMPNO"<>7566 AND "EMPNO"<>7654 AND "EMPNO"<>7698 AND "EMPNO"<>7782 AND
              "EMPNO"<>7788 AND "EMPNO"<>7839 AND "EMPNO"<>7844 AND "EMPNO"<>7876 AND
              "EMPNO"<>7900)
18 rows selected.

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With better formatting (I hope), sorry I am not used to the new forum !
Plan hash value: 2501344126
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<REMOVED BY MODERATOR>
Edited by: Alvaro Tejada Galindo on Apr 10, 2008 3:56 PM

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Hi everybody
I would like to thank you for your cooperation and I will try to answer your questions, but please note that I am a developer in the first place and I am new to oracle database administration, so please forgive me if I did any mistakes.
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Max(serial_no) on a big table

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