RE: Huge optimization costs with 9.2

Yes. You have to bounce the database for this to take effect.

-----Original Message-----
Joan Hsieh
Sent: Thursday, October 02, 2003 10:10 AM To: Multiple recipients of list ORACLE-L

Govind,

I will test it out today and post the updates, I should set optimize_feature_enable back to 9.2.0 before I test this out, right?

JOan

Govind.Arumugam_at_alltel.com wrote:
>
> Can you try to generate the query plan with these settings? These are the 9i CBO Hidden parameters
> to generate 8.1.7 like query plans.
>
> alter session set "_UNNEST_SUBQUERY" = FALSE;
> alter session set "_ORDERED_NESTED_LOOP" = FALSE;
> alter session set "_ALWAYS_SEMI_JOIN" = off;
>
> explain plan for
> <query>;
>
> -----Original Message-----
> Joan Hsieh
> Sent: Wednesday, October 01, 2003 2:10 PM
> To: Multiple recipients of list ORACLE-L
>
> this is the explain plan for the 9i, sorry it is long sql.
>
> Rows Row Source Operation
> ------- ---------------------------------------------------
> 1 LOAD AS SELECT (cr=14674449 r=2275 w=1831 time=787991194 us)
> 42647 NESTED LOOPS OUTER (cr=14673991 r=2273 w=0 time=5081221102 us)
> 42647 NESTED LOOPS OUTER (cr=6448712 r=2187 w=0 time=1730062983 us)
> 42647 NESTED LOOPS OUTER (cr=3262940 r=1395 w=0 time=1075194825
> us)
> 42647 NESTED LOOPS OUTER (cr=2917318 r=1375 w=0 time=973480801
> us)
> 42647 TABLE ACCESS FULL PR_IDENTITY (cr=1207 r=1205 w=0
> time=1452575 us)
> 3766 VIEW PUSHED PREDICATE (cr=2916111 r=170 w=0
> time=971571531 us)
> 3766 HASH JOIN (cr=2916111 r=170 w=0 time=971416648 us)
> 3766 NESTED LOOPS (cr=50183 r=25 w=0 time=759193 us)
> 3766 TABLE ACCESS BY INDEX ROWID PR_MED (cr=46415 r=25 w=0
> time=651677 us)
> 3766 INDEX UNIQUE SCAN PR_MED_UNIQUE_TRUNK (cr=42649 r=24
> w=0 time=503807 us)(object id 51394)
> 3766 TABLE ACCESS BY INDEX ROWID PR_DEPARTMENTS (cr=3768 r=0
> w=0 time=46636 us)
> 3766 INDEX UNIQUE SCAN PR_DEPARTMENTS_PK (cr=2 r=0 w=0
> time=15519 us)(object id 51375)
> 14182756 VIEW (cr=2865928 r=145 w=0 time=942647916 us)
> 14182756 UNION-ALL (cr=2865928 r=145 w=0 time=931367819 us)
> 14182756 HASH JOIN (cr=598795 r=145 w=0 time=243380379 us)
> 14182756 NESTED LOOPS (cr=587497 r=145 w=0 time=195899818
> us)
> 14182756 VIEW (cr=583730 r=145 w=0 time=124765499 us)
> 14182756 UNION-ALL (cr=583730 r=145 w=0 time=112440519 us)
> 0 HASH JOIN (cr=15064 r=0 w=0 time=1416201 us)
> 0 TABLE ACCESS FULL PR_DEPARTMENTS (cr=15064 r=0
> w=0 time=903383 us)
> 0 TABLE ACCESS FULL PR_HR (cr=0 r=0 w=0 time=0 us)
> 14182756 HASH JOIN (cr=568666 r=145 w=0 time=86101027 us)
> 105448 TABLE ACCESS FULL PR_DEPARTMENTS (cr=15064 r=0
> w=0 time=552179 us)
> 14182756 TABLE ACCESS FULL PR_MED (cr=553602 r=145 w=0
> time=26292679 us)
> 14182756 INDEX UNIQUE SCAN PR_ADMIN_TYPES_PK (cr=3767 r=0
> w=0 time=26817559 us)(object id 51357)
> 90384 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=11298 r=0 w=0
> time=228394 us)
> 0 NESTED LOOPS (cr=2255835 r=0 w=0 time=665712789 us)
> 50935150 HASH JOIN (cr=2252068 r=0 w=0 time=429854587 us)
> 90384 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=11298 r=0 w=0
> time=216366 us)
> 50935150 HASH JOIN (cr=2240770 r=0 w=0 time=232393166 us)
> 50935150 TABLE ACCESS FULL PR_SIS (cr=2229472 r=0 w=0
> time=52143346 us)
> 71554 TABLE ACCESS FULL PR_SIS_MAPAUCOLLEGES (cr=11298
> r=0 w=0 time=353694 us)
> 0 INDEX UNIQUE SCAN PR_ADMIN_TYPES_PK (cr=3767 r=0 w=0
> time=115423379 us)(object id 51357)
> 0 HASH JOIN (cr=11298 r=0 w=0 time=900827 us)
> 0 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=11298 r=0 w=0
> time=289225 us)
> 0 MERGE JOIN CARTESIAN (cr=0 r=0 w=0 time=0 us)
> 0 TABLE ACCESS FULL PR_AFFILIATE (cr=0 r=0 w=0 time=0
> us)
> 0 BUFFER SORT (cr=0 r=0 w=0 time=0 us)
> 0 INDEX FULL SCAN PR_ADMIN_TYPES_PK (cr=0 r=0 w=0
> time=0 us)(object id 51357)
> 481 VIEW PUSHED PREDICATE (cr=345622 r=20 w=0 time=101230049
> us)
> 481 HASH JOIN (cr=345622 r=20 w=0 time=101019065 us)
> 481 NESTED LOOPS OUTER (cr=43553 r=5 w=0 time=422888 us)
> 481 TABLE ACCESS BY INDEX ROWID PR_AFFILIATE (cr=43130 r=5
> w=0 time=376132 us)
> 481 INDEX UNIQUE SCAN PR_AFFILIATE_PK (cr=42649 r=4 w=0
> time=292929 us)(object id 51360)
> 421 TABLE ACCESS BY INDEX ROWID PR_DEPARTMENTS (cr=423 r=0
> w=0 time=4703 us)
> 421 INDEX UNIQUE SCAN PR_DEPARTMENTS_PK (cr=2 r=0 w=0
> time=1925 us)(object id 51375)
> 231361 VIEW (cr=302069 r=15 w=0 time=95276432 us)
> 231361 UNION-ALL (cr=302069 r=15 w=0 time=95016018 us)
> 0 HASH JOIN (cr=3848 r=0 w=0 time=417296 us)
> 0 NESTED LOOPS (cr=3848 r=0 w=0 time=351280 us)
> 0 VIEW (cr=3848 r=0 w=0 time=350781 us)
> 0 UNION-ALL (cr=3848 r=0 w=0 time=349902 us)
> 0 HASH JOIN (cr=1924 r=0 w=0 time=222856 us)
> 0 TABLE ACCESS FULL PR_DEPARTMENTS (cr=1924 r=0 w=0
> time=155040 us)
> 0 TABLE ACCESS FULL PR_HR (cr=0 r=0 w=0 time=0 us)
> 0 HASH JOIN (cr=1924 r=0 w=0 time=123298 us)
> 0 TABLE ACCESS FULL PR_DEPARTMENTS (cr=1924 r=0 w=0
> time=72769 us)
> 0 TABLE ACCESS FULL PR_MED (cr=0 r=0 w=0 time=0 us)
> 0 INDEX UNIQUE SCAN PR_ADMIN_TYPES_PK (cr=0 r=0 w=0
> time=0 us)(object id 51357)
> 0 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=0 r=0 w=0 time=0
> us)
> 0 NESTED LOOPS (cr=288120 r=0 w=0 time=89293562 us)
> 6505525 HASH JOIN (cr=287638 r=0 w=0 time=56959607 us)
> 11544 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=1443 r=0 w=0
> time=22346 us)
> 6505525 HASH JOIN (cr=286195 r=0 w=0 time=30650687 us)
> 6505525 TABLE ACCESS FULL PR_SIS (cr=284752 r=0 w=0
> time=6657346 us)
> 9139 TABLE ACCESS FULL PR_SIS_MAPAUCOLLEGES (cr=1443 r=0
> w=0 time=45345 us)
> 0 INDEX UNIQUE SCAN PR_ADMIN_TYPES_PK (cr=482 r=0 w=0
> time=16576867 us)(object id 51357)
> 231361 HASH JOIN (cr=10101 r=15 w=0 time=4671565 us)
> 11544 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=1443 r=0 w=0
> time=52150 us)
> 694083 MERGE JOIN CARTESIAN (cr=8658 r=15 w=0 time=2260463
> us)
> 231361 TABLE ACCESS FULL PR_AFFILIATE (cr=8177 r=15 w=0
> time=375547 us)
> 694083 BUFFER SORT (cr=481 r=0 w=0 time=792138 us)
> 1443 INDEX FULL SCAN PR_ADMIN_TYPES_PK (cr=481 r=0 w=0
> time=8324 us)(object id 51357)
> 4040 VIEW PUSHED PREDICATE (cr=3185772 r=792 w=0 time=654451906
> us)
> 4040 HASH JOIN (cr=3185772 r=792 w=0 time=654294108 us)
> 4040 NESTED LOOPS (cr=50731 r=29 w=0 time=670381 us)
> 4040 TABLE ACCESS BY INDEX ROWID PR_HR (cr=46689 r=27 w=0
> time=534717 us)
> 4040 INDEX UNIQUE SCAN PR_HR_UNIQUE_TRUNK (cr=42649 r=26 w=0
> time=419348 us)(object id 51382)
> 4040 TABLE ACCESS BY INDEX ROWID PR_DEPARTMENTS (cr=4042 r=2
> w=0 time=71243 us)
> 4040 INDEX UNIQUE SCAN PR_DEPARTMENTS_PK (cr=2 r=1 w=0
> time=27603 us)(object id 51375)
> 16321600 VIEW (cr=3135041 r=763 w=0 time=619837379 us)
> 16321600 UNION-ALL (cr=3135041 r=763 w=0 time=606203283 us)
> 16321600 HASH JOIN (cr=707001 r=170 w=0 time=290238002 us)
> 96960 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=12120 r=2 w=0
> time=232462 us)
> 16321600 NESTED LOOPS (cr=694881 r=168 w=0 time=244184125 us)
> 16321600 VIEW (cr=690840 r=167 w=0 time=152375256 us)
> 16321600 UNION-ALL (cr=690840 r=167 w=0 time=138600082 us)
> 16321600 HASH JOIN (cr=690840 r=167 w=0 time=108223600 us)
> 884760 TABLE ACCESS FULL PR_DEPARTMENTS (cr=16160 r=2 w=0
> time=1211703 us)
> 16321600 TABLE ACCESS FULL PR_HR (cr=674680 r=165 w=0
> time=32969121 us)
> 0 FILTER (cr=0 r=0 w=0 time=2557 us)
> 0 HASH JOIN (cr=0 r=0 w=0 time=0 us)
> 0 TABLE ACCESS FULL PR_DEPARTMENTS (cr=0 r=0 w=0
> time=0 us)
> 0 TABLE ACCESS FULL PR_MED (cr=0 r=0 w=0 time=0 us)
> 16321600 INDEX UNIQUE SCAN PR_ADMIN_TYPES_PK (cr=4041 r=1 w=0
> time=38662427 us)(object id 51357)
> 0 NESTED LOOPS (cr=2415920 r=593 w=0 time=288098950 us)
> 0 HASH JOIN (cr=2415920 r=593 w=0 time=288091940 us)
> 48480 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=12120 r=0 w=0
> time=244840 us)
> 54641000 HASH JOIN (cr=2403800 r=593 w=0 time=215881720 us)
> 54641000 TABLE ACCESS FULL PR_SIS (cr=2391680 r=591 w=0
> time=55873125 us)
> 76760 TABLE ACCESS FULL PR_SIS_MAPAUCOLLEGES (cr=12120 r=2
> w=0 time=312667 us)
> 0 INDEX UNIQUE SCAN PR_ADMIN_TYPES_PK (cr=0 r=0 w=0
> time=0 us)(object id 51357)
> 0 HASH JOIN (cr=12120 r=0 w=0 time=930814 us)
> 0 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=12120 r=0 w=0
> time=288454 us)
> 0 MERGE JOIN CARTESIAN (cr=0 r=0 w=0 time=0 us)
> 0 TABLE ACCESS FULL PR_AFFILIATE (cr=0 r=0 w=0 time=0
> us)
> 0 BUFFER SORT (cr=0 r=0 w=0 time=0 us)
> 0 INDEX FULL SCAN PR_ADMIN_TYPES_PK (cr=0 r=0 w=0
> time=0 us)(object id 51357)
> 13525 VIEW PUSHED PREDICATE (cr=8225279 r=86 w=0 time=3350714104
> us)
> 13525 HASH JOIN (cr=8225279 r=86 w=0 time=3350387793 us)
> 13525 NESTED LOOPS (cr=83228 r=86 w=0 time=1409089 us)
> 13525 NESTED LOOPS (cr=69701 r=84 w=0 time=1137279 us)
> 13525 TABLE ACCESS BY INDEX ROWID PR_SIS (cr=56174 r=83 w=0
> time=872406 us)
> 13525 INDEX UNIQUE SCAN PR_SIS_UNIQUE_TRUNK (cr=42649 r=83 w=0
> time=605263 us)(object id 51411)
> 13525 TABLE ACCESS BY INDEX ROWID PR_SIS_MAPAUCOLLEGES
> (cr=13527 r=1 w=0 time=133996 us)
> 13525 INDEX UNIQUE SCAN PR_SIS_MAPAUCOLLEGES_PK (cr=2 r=1 w=0
> time=57327 us)(object id 51415)
> 13525 TABLE ACCESS BY INDEX ROWID PR_SIS_COLLEGES (cr=13527 r=2
> w=0 time=156242 us)
> 13525 INDEX UNIQUE SCAN PR_SIS_COLLEGES_PK (cr=2 r=1 w=0
> time=49119 us)(object id 51413)
> 182925625 VIEW (cr=8142051 r=0 w=0 time=95258575093 us)
> 182925625 UNION-ALL (cr=8142051 r=0 w=0 time=88155847789 us)
> 0 NESTED LOOPS (cr=0 r=0 w=0 time=136686 us)
> 0 NESTED LOOPS (cr=0 r=0 w=0 time=124965 us)
> 0 VIEW (cr=0 r=0 w=0 time=113787 us)
> 0 UNION-ALL (cr=0 r=0 w=0 time=82412 us)
> 0 FILTER (cr=0 r=0 w=0 time=10069 us)
> 0 HASH JOIN (cr=0 r=0 w=0 time=0 us)
> 0 TABLE ACCESS FULL PR_DEPARTMENTS (cr=0 r=0 w=0
> time=0 us)
> 0 TABLE ACCESS FULL PR_HR (cr=0 r=0 w=0 time=0 us)
> 0 FILTER (cr=0 r=0 w=0 time=6060 us)
> 0 HASH JOIN (cr=0 r=0 w=0 time=0 us)
> 0 TABLE ACCESS FULL PR_DEPARTMENTS (cr=0 r=0 w=0
> time=0 us)
> 0 TABLE ACCESS FULL PR_MED (cr=0 r=0 w=0 time=0 us)
> 0 INDEX UNIQUE SCAN PR_ADMIN_TYPES_PK (cr=0 r=0 w=0
> time=0 us)(object id 51357)
> 0 TABLE ACCESS BY INDEX ROWID PR_ADMIN_GROUPS (cr=0 r=0
> w=0 time=0 us)
> 0 INDEX UNIQUE SCAN PR_ADMIN_GROUPS_PK (cr=0 r=0 w=0
> time=0 us)(object id 51355)
> 182925625 NESTED LOOPS (cr=8101476 r=0 w=0 time=83292738128 us)
> 182925625 HASH JOIN (cr=8087950 r=0 w=0 time=52376113695 us)
> 148775 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=40575 r=0 w=0
> time=743515 us)
> 182925625 HASH JOIN (cr=8047375 r=0 w=0 time=17012564710 us)
> 182925625 TABLE ACCESS FULL PR_SIS (cr=8006800 r=0 w=0
> time=6988566170 us)
> 256975 TABLE ACCESS FULL PR_SIS_MAPAUCOLLEGES (cr=40575 r=0
> w=0 time=1317097 us)
> 182925625 INDEX UNIQUE SCAN PR_ADMIN_TYPES_PK (cr=13526 r=0 w=0
> time=16719626449 us)(object id 51357)
> 0 HASH JOIN (cr=40575 r=0 w=0 time=3174900 us)
> 0 TABLE ACCESS FULL PR_ADMIN_GROUPS (cr=40575 r=0 w=0
> time=957411 us)
> 0 MERGE JOIN CARTESIAN (cr=0 r=0 w=0 time=0 us)
> 0 TABLE ACCESS FULL PR_AFFILIATE (cr=0 r=0 w=0 time=0 us)
> 0 BUFFER SORT (cr=0 r=0 w=0 time=0 us)
> 0 INDEX FULL SCAN PR_ADMIN_TYPES_PK (cr=0 r=0 w=0 time=0
> us)(object id 51357)
>
> 8i explain plan from another instance not yet upgrade yet. But this
> explain plain exactly same as 9i instance before upgrade.
>
> Rows Row Source Operation
> ------- ---------------------------------------------------
> 1 LOAD AS SELECT
> 21662 HASH JOIN OUTER
> 21662 HASH JOIN OUTER
> 21662 HASH JOIN OUTER
> 21662 HASH JOIN OUTER
> 21662 TABLE ACCESS FULL PR_IDENTITY
> 3810 VIEW
> 3810 HASH JOIN
> 28 TABLE ACCESS FULL PR_DEPARTMENTS
> 3810 HASH JOIN
> 3810 VIEW PR_ADMINS
> 3810 UNION-ALL
> 3810 HASH JOIN
> 24 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 3810 NESTED LOOPS
> 3811 VIEW
> 3811 UNION-ALL
> 1 HASH JOIN
> 0 TABLE ACCESS FULL PR_DEPARTMENTS
> 0 TABLE ACCESS FULL PR_HR
> 3811 HASH JOIN
> 28 TABLE ACCESS FULL PR_DEPARTMENTS
> 3810 TABLE ACCESS FULL PR_MED
> 3810 INDEX UNIQUE SCAN (object id 41938)
> 0 NESTED LOOPS
> 13790 HASH JOIN
> 24 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 13789 HASH JOIN
> 13789 TABLE ACCESS FULL PR_SIS
> 19 TABLE ACCESS FULL PR_SIS_MAPAUCOLLEGES
> 0 INDEX UNIQUE SCAN (object id 41938)
> 0 HASH JOIN
> 0 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 0 MERGE JOIN CARTESIAN
> 0 TABLE ACCESS FULL PR_AFFILIATE
> 0 SORT JOIN
> 0 INDEX FULL SCAN (object id 41938)
> 3810 TABLE ACCESS FULL PR_MED
> 4221 VIEW
> 4221 HASH JOIN
> 4221 VIEW PR_ADMINS
> 4221 UNION-ALL
> 4221 HASH JOIN
> 24 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 4221 NESTED LOOPS
> 4222 VIEW
> 4222 UNION-ALL
> 4222 HASH JOIN
> 220 TABLE ACCESS FULL PR_DEPARTMENTS
> 4221 TABLE ACCESS FULL PR_HR
> 1 FILTER
> 0 HASH JOIN
> 0 TABLE ACCESS FULL PR_DEPARTMENTS
> 0 TABLE ACCESS FULL PR_MED
> 4221 INDEX UNIQUE SCAN (object id 41938)
> 0 NESTED LOOPS
> 1 HASH JOIN
> 12 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 13789 HASH JOIN
> 13789 TABLE ACCESS FULL PR_SIS
> 19 TABLE ACCESS FULL PR_SIS_MAPAUCOLLEGES
> 0 INDEX UNIQUE SCAN (object id 41938)
> 0 HASH JOIN
> 0 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 0 MERGE JOIN CARTESIAN
> 0 TABLE ACCESS FULL PR_AFFILIATE
> 0 SORT JOIN
> 0 INDEX FULL SCAN (object id 41938)
> 4221 HASH JOIN
> 220 TABLE ACCESS FULL PR_DEPARTMENTS
> 4221 TABLE ACCESS FULL PR_HR
> 13789 VIEW
> 13789 HASH JOIN
> 24 TABLE ACCESS FULL PR_SIS_COLLEGES
> 13789 HASH JOIN
> 19 TABLE ACCESS FULL PR_SIS_MAPAUCOLLEGES
> 13789 HASH JOIN
> 13789 VIEW PR_ADMINS
> 13789 UNION-ALL
> 0 HASH JOIN
> 0 NESTED LOOPS
> 1 VIEW
> 1 UNION-ALL
> 1 FILTER
> 0 HASH JOIN
> 0 TABLE ACCESS FULL PR_DEPARTMENTS
> 0 TABLE ACCESS FULL PR_HR
> 1 FILTER
> 0 HASH JOIN
> 0 TABLE ACCESS FULL PR_DEPARTMENTS
> 0 TABLE ACCESS FULL PR_MED
> 0 INDEX UNIQUE SCAN (object id 41938)
> 0 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 13789 NESTED LOOPS
> 13790 HASH JOIN
> 11 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 13789 HASH JOIN
> 13789 TABLE ACCESS FULL PR_SIS
> 19 TABLE ACCESS FULL PR_SIS_MAPAUCOLLEGES
> 13789 INDEX UNIQUE SCAN (object id 41938)
> 0 HASH JOIN
> 0 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 0 MERGE JOIN CARTESIAN
> 0 TABLE ACCESS FULL PR_AFFILIATE
> 0 SORT JOIN
> 0 INDEX FULL SCAN (object id 41938)
> 13789 TABLE ACCESS FULL PR_SIS
> 496 VIEW
> 496 HASH JOIN
> 496 HASH JOIN OUTER
> 496 TABLE ACCESS FULL PR_AFFILIATE
> 248 TABLE ACCESS FULL PR_DEPARTMENTS
> 496 VIEW PR_ADMINS
> 496 UNION-ALL
> 0 HASH JOIN
> 24 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 0 NESTED LOOPS
> 1 VIEW
> 1 UNION-ALL
> 1 HASH JOIN
> 0 TABLE ACCESS FULL PR_DEPARTMENTS
> 0 TABLE ACCESS FULL PR_HR
> 1 HASH JOIN
> 0 TABLE ACCESS FULL PR_DEPARTMENTS
> 0 TABLE ACCESS FULL PR_MED
> 0 INDEX UNIQUE SCAN (object id 41938)
> 0 NESTED LOOPS
> 13790 HASH JOIN
> 24 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 13789 HASH JOIN
> 13789 TABLE ACCESS FULL PR_SIS
> 19 TABLE ACCESS FULL PR_SIS_MAPAUCOLLEGES
> 0 INDEX UNIQUE SCAN (object id 41938)
> 496 HASH JOIN
> 24 TABLE ACCESS FULL PR_ADMIN_GROUPS
> 1488 MERGE JOIN CARTESIAN
> 497 TABLE ACCESS FULL PR_AFFILIATE
> 1488 SORT JOIN
> 3 INDEX FULL SCAN (object id 41938)
>
> Tanel Poder wrote:
> >
> > Execution plans would be helpful.
> > If optimizer_index_* parameters are unset, CBO tends to prefer full table
> > access more, which doesn't seem to be your case (but exectution plans are
> > needed in order to be sure in that).
> >
> > As Mladen asked about histograms -> do you use bind variables in your
> > queries? In 8i CBO can't peek bind variable values during hard parse, but in
> > 9i it can, this feature in combination with histograms might cause execution
> > plan change...
> >
> > Did you do the analyzing in 9i exactly the same way and with same tools than
> > in 8i?
> >
> > Tanel.
> >
> > ----- Original Message -----
> > To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> > Sent: Wednesday, October 01, 2003 7:09 PM
> >
> > > Joan, what is the difference in the plans? What specific feature
> > > made the difference? Are the values of
> > > optimizer_index_cost_adj and optimizer_index_caching same on both
> > > versions? How about histograms? What is with
> > > db_file_multiblock_read_count,sort_area_size and hash_area_size? Is
> > > everything same as in 8i? May be setting of those parameters can be
> > > tweaked to your benefit?
> > >
> > > On Wed, 2003-10-01 at 11:54, Joan Hsieh wrote:
> > > > Kirti,
> > > >
> > > > I had upgraded a database from 8.1.7.4 to 9.2.0.4. Before the upgrade,
> > > > performance is good. After upgrade, one query run time from 2 min to 12
> > > > hours. Of course, I re-analyzed all tables and indexes. The explain plan
> > > > changed from hash join to nested-loop. All the parameters are same. So I
> > > > have to put optimized_feature_enable=8.1.7 to make run normal as usual.
> > > > I hate to disable the new feature, but no choose.
> > > >
> > > > Joan
> > > >
> > > > Kirtikumar Deshpande wrote:
> > > > >
> > > > > Were tables/indexes anlayzed after the upgrade?
> > > > >
> > > > > - Kirti
> > > > >
> > > > > --- Jeff Landers <jlanders_at_convergys.com> wrote:
> > > > > > Hello All
> > > > > >
> > > > > > Version & OS:
> > > > > > Upgraded from 9.0.1.4 (Sun Solaris 2.8) to 9.2.0.3.
> > > > > >
> > > > > > Problem:
> > > > > > We've captured the sql text and optimization plans for critical sql
> > > > > > prior to upgrading to 9.2. After the upgrade we have noticed
> > > > > > that the cost associated with every sql statement is now HUGE
> > > > > > compared to its 9.0.1.4 counterpart. Per the statistics being
> > captured
> > > > > > via traces,
> > > > > > these statement are noticeably slower per execution.
> > > > > >
> > > > > > Anyone experiencing/experienced the same problem with 9.2?
> > > > > >
> > > > > > Thank you in advance.
> > > > > >
> > > > > >
> > > > >
> > > > > __________________________________
> > > > > Do you Yahoo!?
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> > > > > --
> > > > > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > > > > --
> > > > > Author: Kirtikumar Deshpande
> > > > > INET: kirtikumar_deshpande_at_yahoo.com
> > > > >
> > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com
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> > > > > to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> > > > > the message BODY, include a line containing: UNSUB ORACLE-L
> > > > > (or the name of mailing list you want to be removed from). You may
> > > > > also send the HELP command for other information (like subscribing).
> > > > --
> > > > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > >
> > >
> > >
> > >
> > > Note:
> > > This message is for the named person's use only. It may contain
> > confidential, proprietary or legally privileged information. No
> > confidentiality or privilege is waived or lost by any mistransmission. If
> > you receive this message in error, please immediately delete it and all
> > copies of it from your system, destroy any hard copies of it and notify the
> > sender. You must not, directly or indirectly, use, disclose, distribute,
> > print, or copy any part of this message if you are not the intended
> > recipient. Wang Trading LLC and any of its subsidiaries each reserve the
> > right to monitor all e-mail communications through its networks.
> > > Any views expressed in this message are those of the individual sender,
> > except where the message states otherwise and the sender is authorized to
> > state them to be the views of any such entity.
> > >
> > > --
> > > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > > --
> > > Author: Mladen Gogala
> > > INET: mladen_at_wangtrading.com
> > >
> > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> > > San Diego, California -- Mailing list and web hosting services
> > > ---------------------------------------------------------------------
> > > To REMOVE yourself from this mailing list, send an E-Mail message
> > > to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> > > the message BODY, include a line containing: UNSUB ORACLE-L
> > > (or the name of mailing list you want to be removed from). You may
> > > also send the HELP command for other information (like subscribing).
> > >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: Tanel Poder
> > INET: tanel.poder.003_at_mail.ee
> >
> > Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> > San Diego, California -- Mailing list and web hosting services
> > ---------------------------------------------------------------------
> > To REMOVE yourself from this mailing list, send an E-Mail message
> > to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> > the message BODY, include a line containing: UNSUB ORACLE-L
> > (or the name of mailing list you want to be removed from). You may
> > also send the HELP command for other information (like subscribing).
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Joan Hsieh
> INET: joan.hsieh_at_tufts.edu
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: <Govind.Arumugam_at_alltel.com
> INET: Govind.Arumugam_at_alltel.com
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Joan Hsieh
  INET: joan.hsieh_at_tufts.edu

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: <Govind.Arumugam_at_alltel.com
  INET: Govind.Arumugam_at_alltel.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).