Analytic Functions are performed on a resultant dataset. For example,


SQL> SELECT
ENAME,
SAL,
DEPTNO,
MAX(SAL) OVER (PARTITION BY DEPTNO) MGR_SAL_BY_DEPT,
sal/MAX(SAL) OVER (PARTITION BY DEPTNO) *100 EMP_percent_SAL
FROM EMP
WHERE DEPTNO=20
ORDER BY DEPTNO;

In above query Oracle would apply the analytic function on the dataset returned by the query after applying *where DEPTNO=20* condition.


So the answer to your question is YES. Not because partitioning will help the anaytic function perform better directly but because right use of partitioning may improve the way your query filters the the data before returning the final dataset.

Hope this helps.
Kirtan