Right place to ask tuning question?

Question

I have a query running that takes 2 minutes.
It hits seven tables, of row counts 11, 3890, 8049, 9374, 9386, 9510, and 26460.
By all means this is a small query. I have no cartesian joins (but everything is a nested loops outer), and get 7160 rows output.
I believe that there should be no way that this query takes two minutes based on the size of the tables it hits and
the simplicity of it. Unfortunately, four of the tables are 'joined in' as views that are filtered by a date from a one row
table that is always cached. I have tried inline views instead of using the views, and putting an index on a
table (just because it was doing a full table scan and nothing else I had done had changed the plan), and that
gives me about 2 seconds faster response. I don't think I need an index on this table, but if it makes it go faster then
I'm all for it..
I've tried CBO (currently it's hinted to use RULE) and PQO, and they all go way out of proportion and take a lot
longer than two minutes. Is this the place to put table descriptions, the query, and tkprof output? Would anyone be able
to assist me?
Thanks,
Dennis

Answer 1

Thanks, we analyze weekly. I'm trying to get off RBO (as it is really not improving at all between versions (has not been for awhile actually)).
This is one of few views that have RBO, and the query time seems unreasonable for the amount of data it's pulling. I really expected to
see a Cartesian Merge Join.
1. Using Oracle 8.1.6.3 (in about two months, 9iR2).
2. Have you been on my system??? We've had views 12 levels deep, with the 'outer' view doing 25 union alls. That was a mess. Fortunately,
I did not design it so I can say it sucked (not that I'm saying I could have done anything better). This is fairly simple: here's the
tkprof explain plan. This is the original plan. Adding the one index had much the same plan, but had a index range access on C_BKG_ADDRESS.
C_BKG_ADDRESS is a MV I put this at the end. All the other C_ views basically select * from the base table where effective and expiration dates are between extract_date,
which is a value in a one row cached table (table is only one row, one column and is cached).
select T1.DISTRICT_FUNCTION_UNIT c1,
T1.HOME_ORGANIZATION_DESC c2,
T1.LAST_NAME c3, T1.FIRST_NAME c4,
T1.MIDDLE_NAME c5, T1.BASE_SALARY_RATE c6,
T1.TITLE_CD c7, T1.TITLE_DESC c8,
T1.SALARY_GRADE c9, T1.HOME_ORGANIZATION_CD c10
from HRDMADM.V_EE_ROSTER T1
order by 1 asc, 2 asc, 10 asc, 8 asc, 7 asc, 3 asc, 4 asc
call count cpu elapsed disk query current rows
Parse 1 0.03 0.37 0 0 0 0
Execute 2 0.00 0.01 0 0 0 0
Fetch 476 6.58 8.58 4887 30627 99 7120
total 479 6.61 8.96 4887 30627 99 7120
Misses in library cache during parse: 1
Optimizer goal: RULE
Parsing user id: 129 (TESTTUNE)
Rows Row Source Operation
7120 SORT ORDER BY
7120 VIEW V_EE_ROSTER
7120 SORT UNIQUE
7120 MERGE JOIN OUTER
7121 SORT JOIN
7120 MERGE JOIN OUTER
7121 SORT JOIN
7120 MERGE JOIN OUTER
7121 SORT JOIN
7120 MERGE JOIN OUTER
7121 SORT JOIN
7120 MERGE JOIN OUTER
7121 SORT JOIN
7120 NESTED LOOPS OUTER
7121 TABLE ACCESS FULL BKG_SNAP_EMPLOYEE
7120 INDEX RANGE SCAN (object id 267185)
7120 SORT JOIN
9510 VIEW C_BKG_EMPL_ASGNMT
9512 NTABLE ACCESS FULL HRDM_EXTRACT_DATE
9510 TABLE ACCESS BY INDEX ROWID BKG_EMPL_ASGNMT
9511 INDEX RANGE SCAN (object id 267191)
6834 SORT JOIN
8049 VIEW C_BKG_USER_FIELDS_ENTRY
8049 NESTED LOOPS
2 TABLE ACCESS FULL HRDM_EXTRACT_DATE
8049 TABLE ACCESS FULL BKG_USER_FIELDS_ENTRY
7117 SORT JOIN
26460 TABLE ACCESS FULL C_BKG_ADDRESS
7120 SORT JOIN
11 VIEW C_REF_EMPLOYMENT_STATUS
8049 VIEW C_BKG_USER_FIELDS_ENTRY
8042 NTABLE ACCESS FULL HRDM_EXTRACT_DATE
8049 TABLE ACCESS FULL BKG_USER_FIELDS_ENTRY
7117 SORT JOIN
26460 TABLE ACCESS FULL C_BKG_ADDRESS
7111 SVNTABLE ACCESS FULL REF_EMPLOYMENT_STATUS
7120 SORT JOIN
3890 VIEW C_REF_TITLE
3892 NTABLE ACCESS FULL HRDM_EXTRACT_DATE
3890 TABLE ACCESS FULL REF_TITLE
======== this is V_EE_ROSTER ==============
CREATE OR REPLACE VIEW HRDMADM.V_EE_ROSTER
DISTRICT_FUNCTION_UNIT,
HOME_AGENCY,
HOME_ORGANIZATION_CD,
HOME_ORGANIZATION_DESC,
EFFECTIVE_DATE,
GHRS_INTERNAL_EMPL_ID_NO,
APPOINTMENT_ID,
LAST_NAME,
FIRST_NAME,
MIDDLE_NAME,
EMPLMT_STAT_CD,
TITLE_CD,
TITLE_DESC,
SALARY_GRADE,
AMT_BASIS_ID,
SUPERVISORY_CD,
BASE_SALARY_RATE,
WORK_AREA_CD,
WORK_EXCHG_CD,
WORK_TRUNK_NO,
EXT_NO,
WORK_AREA_CD2,
WORK_EXCHG_CD2,
WORK_TRUNK_NO2,
EXT_NO2,
MAIL_ADDR_LINE_1,
MAIL_ADDR_LINE_2,
MAIL_CITY,
MAIL_STATE,
MAIL_ZIP_PREFIX,
MAIL_ZIP_SUFFIX,
SOCIAL_SECURITY_NO,
BIRTH_DATE,
RETIREMENT_SVC_DATE,
DEPT_SVC_DATE,
HIRED_DATE,
PERM_TEMP_ID,
ETHNIC_CD,
ETHNIC_DESC,
SEX,
DISABILITY_CD,
DISABILITY_DESC,
AGE,
HOME_AREA_CODE,
HOME_EXCHG_CODE,
HOME_TRUNK_NO,
HOME_EXT_NO,
MAIL_SAME_AS_HOME_ADDRESS_FL,
PRIVATE_HOME_FL
AS
SELECT /*+ RULE */
DISTINCT
hrdm_homeorg.CalcDistFctUnit(CASGN.GHRS_INTERNAL_EMPL_ID_NO,
CASGN.HOME_ORGANIZATION,
CASGN.EFFECTIVE_DATE,
CASGN.HOME_AGENCY) DISTRICT_FUNCTION_UNIT,
HOME_AGENCY HOME_AGENCY,
HOME_ORGANIZATION HOME_ORGANIZATION_CD,
F_home_org_name(CASGN.HOME_ORGANIZATION,
CASGN.EFFECTIVE_DATE,
CASGN.HOME_AGENCY) HOME_ORGANIZATION_DESC,
CASGN.EFFECTIVE_DATE EFFECTIVE_DATE,
SNAP.GHRS_IN_EMPL_ID_NO GHRS_INTERNAL_EMPL_ID_NO,
SNAP.APPT_ID APPOINTMENT_ID,
SNAP.EMP_LAST_NAME LAST_NAME,
SNAP.EMP_FIRST_NAME FIRST_NAME,
SNAP.EMP_MIDDLE_NAME MIDDLE_NAME,
SNAP.EMPS_CD EMPLMT_STAT_CD,
SNAP.TITL_CD TITLE_CD,
SNAP.TITL_LONG_DESC TITLE_DESC,
SNAP.GRDE_CD SALARY_GRADE,
SNAP.AMT_BASIS_ID AMT_BASIS_ID,
CTITL.JOB_REQUIREMENT_CD SUPERVISORY_CD,
SNAP.BASE_PAY_RATE_AMT BASE_SALARY_RATE,
CASGN.WORK_LOC_1ST_AREA_CODE WORK_AREA_CD,
CASGN.WORK_LOC_1ST_EXCHG_CODE WORK_EXCHG_CD,
CASGN.WORK_LOC_1ST_TRUNK_NO WORK_TRUNK_NO,
CASGN.WORK_LOC_1ST_EXT_NO EXT_NO,
CASGN.WORK_LOC_2ND_AREA_CODE WORK_AREA_CD2,
CASGN.WORK_LOC_2ND_EXCHG_CODE WORK_EXCHG_CD2,
CASGN.WORK_LOC_2ND_TRUNK_NO WORK_TRUNK_NO2,
CASGN.WORK_LOC_2ND_EXT_NO EXT_NO2,
SNAP.MAIL_ADDR_LINE_1 MAIL_ADDR_LINE_1,
SNAP.MAIL_ADDR_LINE_2 MAIL_ADDR_LINE_2,
SNAP.MAIL_CITY_NAME MAIL_CITY,
SNAP.MAIL_ST_CD MAIL_STATE,
SNAP.MAIL_ZIP_PREFIX MAIL_ZIP_PREFIX,
SNAP.MAIL_ZIP_SUFFIX MAIL_ZIP_SUFFIX,
SNAP.EMP_ID SOCIAL_SECURITY_NO,
SNAP.DOB_DATE BIRTH_DATE,
USR1.ELEMENT_VALUE_01 RETIREMENT_SVC_DATE,
USR1.ELEMENT_VALUE_02 DEPT_SVC_DATE,
USR1.ELEMENT_VALUE_03 HIRED_DATE,
SNAP.PERM_TEMP_FL PERM_TEMP_ID,
SNAP.ETHN_CD ETHNIC_CD,
SNAP.ETHN_LONG_DESC ETHNIC_DESC,
SNAP.GENDER_ID SEX,
SNAP.DSBL_CD DISABILITY_CD,
SNAP.DSBL_LONG_DESC DISABILITY_DESC,
SNAP.EMPLOYEE_AGE AGE,
C_BKG_ADDRESS.EMPLOYEE_AREA_CODE HOME_AREA_CODE,
C_BKG_ADDRESS.EMPLOYEE_EXCHG_CODE HOME_EXCHG_CODE,
C_BKG_ADDRESS.EMPLOYEE_TRUNK_NO HOME_TRUNK_NO,
C_BKG_ADDRESS.EMPLOYEE_EXT_NO HOME_EXT_No,
C_BKG_ADDRESS.MAIL_SAME_AS_HOME_ADDRESS_FL MAIL_SAME_AS_HOME_ADDRESS_FL,
C_BKG_ADDRESS.PRIVATE_HOME_FL PRIVATE_HOME_FL
FROM <---- NOTE: I'm testing this now with the tables in the proper order for RULE *
BKG_SNAP_EMPLOYEE SNAP,
C_BKG_EMPL_ASGNMT CASGN,
C_REF_TITLE CTITL,
BKG_EMPL_APPT,
C_REF_EMPLOYMENT_STATUS,
C_BKG_USER_FIELDS_ENTRY USR1,
C_BKG_ADDRESS
WHERE
SNAP.GHRS_IN_EMPL_ID_NO = CASGN.GHRS_INTERNAL_EMPL_ID_NO (+) AND
NVL(SNAP.APPT_ID,' ' ) = NVL(CASGN.APPOINTMENT_ID (+),' ') AND
SNAP.GHRS_IN_EMPL_ID_NO = C_BKG_ADDRESS.GHRS_INTERNAL_EMPL_ID_NO (+) AND
SNAP.GHRS_IN_EMPL_ID_NO = BKG_EMPL_APPT.GHRS_INTERNAL_EMPL_ID_NO (+) AND
NVL(SNAP.APPT_ID, ' ') = NVL(BKG_EMPL_APPT.APPOINTMENT_ID(+), ' ') AND
SNAP.TITL_CD = CTITL.TITLE_CD (+) AND
SNAP.EMPS_CD = C_REF_EMPLOYMENT_STATUS.EMPLOYMENT_STATUS_CD (+) AND
CASGN.GHRS_INTERNAL_EMPL_ID_NO = USR1.GHRS_INTERNAL_EMPL_ID_NO (+) AND
NVL(CASGN.APPOINTMENT_ID, ' ') = NVL(USR1.APPOINTMENT_ID (+), ' ') AND
SNAP.EMPS_CD NOT IN ('2', 'T', '0', '8') AND
SNAP.TITL_CD <> 'R09986'
====== this is explain plan w/ the index =============
call count cpu elapsed disk query current rows
Parse 1 0.04 0.32 0 0 0 0
Execute 2 0.00 0.00 0 0 0 0
Fetch 476 6.23 17.47 7253 51598 87 7120
total 479 6.27 17.79 7253 51598 87 7120
Misses in library cache during parse: 1
Optimizer goal: RULE
Parsing user id: 129 (TESTTUNE)
Rows Row Source Operation
7120 SORT ORDER BY
7120 VIEW V_EE_ROSTER
7120 SORT UNIQUE
7120 MERGE JOIN OUTER
7121 SORT JOIN
7120 MERGE JOIN OUTER
7121 SORT JOIN
7120 MERGE JOIN OUTER
7121 SORT JOIN
7120 MERGE JOIN OUTER
7121 SORT JOIN
7120 NESTED LOOPS OUTER
7121 NESTED LOOPS OUTER
7121 TABLE ACCESS FULL BKG_SNAP_EMPLOYEE
7117 TABLE ACCESS BY INDEX ROWID C_BKG_ADDRESS
14237 INDEX RANGE SCAN (object id 362347)
7120 INDEX RANGE SCAN (object id 267185)
7120 SORT JOIN
9510 VIEW C_BKG_EMPL_ASGNMT
9510 NESTED LOOPS
2 TABLE ACCESS FULL HRDM_EXTRACT_DATE
9510 TABLE ACCESS BY INDEX ROWID BKG_EMPL_ASGNMT
9511 INDEX RANGE SCAN (object id 267191)
6834 SORT JOIN
8049 VIEW C_BKG_USER_FIELDS_ENTRY
8049 NESTED LOOPS
2 TABLE ACCESS FULL HRDM_EXTRACT_DATE
8049 TABLE ACCESS FULL BKG_USER_FIELDS_ENTRY
7120 SORT JOIN
11 VIEW C_REF_EMPLOYMENT_STATUS
11 NESTED LOOPS
2 TABLE ACCESS FULL HRDM_EXTRACT_DATE
11 TABLE ACCESS FULL REF_EMPLOYMENT_STATUS
7120 SORT JOIN
3890 VIEW C_REF_TITLE
3890 NESTED LOOPS
2 TABLE ACCESS FULL HRDM_EXTRACT_DATE
3890 TABLE ACCESS FULL REF_TITLE
====
Thanks,
Dennis