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Question : Complex SQL Query
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Guys any Scope for Optimization!!
SELECT H1.USERNUM,
H1.HANDLE AS USERNAME,
H1.FIRSTNAME AS FIRST_NAME,
H1.MAIDENNAME AS MAIDEN_NAME,
H1.LASTNAME AS LAST_NAME,
H1.EMAIL,
H1.SCHOOL_ID,
H1.GRADYEAR AS GRAD_YEAR,
H1.GENDER,
H1.CITY,
H1.STATE,
H1.DATE_CREATED AS DATE_OF_REG,
H1.LAST_VISIT AS DATE_OF_LAST_VISIT,
H1.BIRTHDAY AS DATE_OF_BIRTH,
H1.DATING AS IS_DATING,
HEP.ACTIVITYWATCH_FREQ,
USS.IS_SUBSCRIBED,
USS.WLFY_COUNT AS WSFM_COUNT,
USS.WLFY_COUNT_THIS_WEEK AS WSFM_COUNT_LAST_WEEK,
USS.MSG_COUNT,
HAW.SCHOOL_ID AS WATCHED_SCHOOL_ID,
HAW.STARTYEAR AS WATCHED_START_YEAR,
HAW.ENDYEAR AS WATCHED_END_YEAR,
(SELECT NTP.THEN_PHOTO_ID FROM ALBUM.NOW_THEN_PHOTO NTP WHERE NTP.USERNUM = H1.USERNUM) AS THEN_PHOTO_ID,
(SELECT NTP.NOW_PHOTO_ID FROM ALBUM.NOW_THEN_PHOTO NTP WHERE NTP.USERNUM = H1.USERNUM) AS NOW_PHOTO_ID,
(SELECT COUNT (DISTINCT VPT.VIEWER_USERNUMBER)
FROM VIEW_PROFILE_TRACKING VPT, HSA H2
WHERE VPT.VIEWER_USERNUMBER = H2.USERNUM
AND H2.DELETED = 0
AND VPT.VIEW_DATE BETWEEN TRUNC(sysdate)-7 AND ?
AND VPT.VIEWEE_USERNUMBER <> VPT.VIEWER_USERNUMBER
AND VPT.VIEWEE_USERNUMBER = H1.USERNUM) AS WVMP_COUNT_LAST_WEEK,
(SELECT COUNT (DISTINCT VPT.VIEWER_USERNUMBER)
FROM VIEW_PROFILE_TRACKING VPT, HSA H2
WHERE VPT.VIEWER_USERNUMBER = H2.USERNUM
AND H2.DELETED = 0
AND VPT.VIEW_DATE BETWEEN TRUNC(?)-365 AND ?
AND VPT.VIEWEE_USERNUMBER <> VPT.VIEWER_USERNUMBER
AND VPT.VIEWEE_USERNUMBER = H1.USERNUM) AS WVMP_COUNT_PAST_YEAR,
(SELECT P.PROFILE_UPDATED FROM PROFILE.PROFILE P WHERE P.USERNUM = H1.USERNUM) AS LAST_PROFILE_MODIFY_DATE,
(SELECT COUNT(F.PROFILE_ID) FROM PROFILE.FAVORITES F WHERE F.PROFILE_ID = (SELECT ID FROM PROFILE.PROFILE WHERE USERNUM = H1
.USERNUM)) AS NUM_OF_INTERESTS,
(SELECT MAX(SEARCH_DATE) FROM PEOPLE_SEARCH_HISTORY PSH WHERE PSH.USERNUM = H1.USERNUM AND PSH.DELETED = 0) AS LAST_PEOPLE_S
EARCH_DATE,
(SELECT COUNT(SEARCH_ID) FROM PEOPLE_SEARCH_HISTORY PSH WHERE PSH.USERNUM = H1.USERNUM AND PSH.DELETED = 0) AS SAVED_SEARCHE
S_COUNT,
(SELECT LAST_ENTRY_DATE FROM BLOG.BLOG B WHERE B.USERNUM = H1.USERNUM) AS LAST_BLOG_ENTRY_DATE,
(SELECT MAX(P.CREATE_DATE) FROM ALBUM.PHOTO_ALBUM PA, ALBUM.PHOTO P WHERE PA.USERNUM = H1.USERNUM AND P.PHOTO_ALBUM_ID = PA
.PHOTO_ALBUM_ID) AS LAST_PHOTO_UPLOAD_DATE,
(SELECT COUNT(P.PHOTO_ID) FROM ALBUM.PHOTO_ALBUM PA, ALBUM.PHOTO P WHERE PA.USERNUM = H1.USERNUM AND P.PHOTO_ALBUM_ID = PA.
PHOTO_ALBUM_ID) AS NUM_OF_PHOTOS,
(SELECT COUNT(ABE.ID) FROM ADDRESSBOOK.ADDRESSBOOK AB, ADDRESSBOOK.ADDRESSBOOK_ENTRY ABE WHERE AB.USERNUM = H1.USERNUM AND A
BE.ADDRESSBOOK_ID = AB.ID AND NVL(ABE.USERNUM, 0) <> 25657194) AS NUM_OF_CONTACTS,
(SELECT COUNT(HSAAW.USERNUM) FROM HSAALUMNIWATCH HSAAW WHERE HSAAW.SCHOOL_ID = H1.SCHOOL_ID AND HSAAW.STARTYEAR <= H1.GRADYE
AR+2 AND HSAAW.ENDYEAR >= H1.GRADYEAR-2 AND HSAAW.DATE_CREATED BETWEEN TRUNC(?)-7 AND ?) AS NEW_STUDENTS_OF_PRIMARY_SCHOOL,
(SELECT REU.REUNIONDATE from RC_HSAREUNIONS REU WHERE REU.GROUPID = H1.SCHOOL_ID AND REU.GROUPYEAR = H1.GRADYEAR) AS REUNION
_DATE
FROM HSA H1
INNER JOIN HSA_EMAIL_PROFILE HEP ON HEP.USERNUM = H1.USERNUM
LEFT OUTER JOIN HSAALUMNIWATCH HAW ON HAW.USERNUM = H1.USERNUM
LEFT OUTER JOIN USER_SEARCH_STATS USS ON USS.USERNUM = H1.USERNUM
WHERE H1.USERNUM BETWEEN 0 AND 2000
AND H1.DELETED = 0
AND HEP.HARDBOUNCE = 0
AND HEP.ACTIVITYWATCH_FREQ > 0
AND HEP.VALIDATION_STATUS IN (1,2)
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Answer : Complex SQL Query
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Yes.
1. Eliminate the outer joins, if possible
2. Eliminate the "select distinct..." (try to use just "select..." instead)
3. Make sure that the "where" clauses provide indexed values that are quite distinctive.
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