Help With Query Performance

Question

Hi Everyone,
I have to query a table that stores daily information and I only need to get the current month's data out of there. There is A LOT of data in there (4 years X 15 stores X 65 depts). I was wondering if there was a way to get the current month's data fast. Now it's extremely slow, 5 mins to query, and my users can't wait that long.
Any sugguestions
Thank You
-Sam

Answer 1

Assuming that emp_id is the PK of emp, then you do not need the MAX on the data from emp. Also you really do not need to put conditions against sysdate. If you only want the records for the current month, then this should work:
SELECT TO_CHAR(cms_bh_dagent.row_date, 'mm/yyyy') row_date,
       emp.id, emp.short_name, emp.dept_code, emp.descr,
       SUM(cms_bh_dagent.ti_stafftime) AS ti_stafftime,
       SUM(cms_bh_dagent.ti_availtime) AS ti_availtime,
       SUM(cms_bh_dagent.acdcalls) AS acdcalls,
       SUM(cms_bh_dagent.acdtime) AS acdtime,
       SUM(cms_bh_dagent.acwtime) AS acwtime,
       SUM(cms_bh_dagent.holdcalls) AS holdcalls,
       SUM(cms_bh_dagent.holdtime) AS holdtime,
       SUM(cms_bh_dagent.ti_auxtime0) AS ti_auxtime0
FROM cms_bh_dagent
        INNER JOIN emp ON cms_bh_dagent.logid = emp.acd_login_id
WHERE cms_bh_dagent.row_date BETWEEN TRUNC(sysdate, 'MONTH') AND
                                     LAST_DAY(TRUNC(sysdate)) and
      emp.code = :tlcode
GROUP BY TO_CHAR(cms_bh_dagent.row_date, 'mm/yyyy'),
         emp.id, emp.short_name, emp.dept_code, emp.descrIt seems to me that an index on emp.code might be useful in this query, as well as one on cms_bh_dagent (logid , row_date).
If you want to be able to specify the from and to date, then replace the predicate on cms_bh_dagent.row_date with:
BETWEEN TO_DATE(start_date, 'your_format') AND TO_DATE(end_date, 'your_format')
HTH
John