Question of the optimizer V9.2-> upgrade 11.2

Well I spent time this formatting and it cleaning to get an error when I tried to post it I hope it comes out ok.

Solaris 10

Versions of Oracle 9.2.0.6 and 11.2.0.3

In the middle to test an upgrade of a system 9.2.0.6 SAP 11.2.0.3 for production updated in September.

We had teams of application test various SAP transactions before and after the upgrade and save the time of transaction. Fortunately, we have a sandbox environment which is still in 9.2.0.4 so that we can easily test it side by side with an improved test environment. A specific transaction in SAP takes 30-60 seconds on the 11.2 system while it is running in 2 to 5 seconds on 9.2.0.4.

Most of the time in v11 is dedicated to this query that is executed 1000 times, as evidenced by a trace of SAP on the transaction.

  SELECT "KUNNR" , "KUNN2"
    FROM "KNVP"
   WHERE "MANDT" = :A0 AND
         "KUNN2" IN ( :A1 , :A2 , :A3 , :A4 , :A5 ) AND
         "VKORG" = :A6 AND
         "VTWEG" = :A7 AND
         "SPART" = :A8 AND
         "PARVW" IN ( :A9 , :A10 , :A11 )

The individual query is not slow, but when combined at runtime for 1000 executions is most of the runtime.

I threw together a plsql anonymous loop which took place this 1000 times, such as the SAP transaction. This works in the environment of V9 it runs in some secondes.2 with no change in the V11 environment it runs in about 60 seconds.

Just trying to get some information I did an autotrace in versions 9 and 11.

Plan of version 9 and autotrace.

Execution plan

----------------------------------------------------------

0 SELECT STATEMENT Optimizer = CHOOSE (cost = 1 card = 18 bytes = 576)

1 0 INLIST ITERATOR

2 1 ACCESS TABLE (BY INDEX ROWID) OF "KNPV" (cost = 1 card = 18 bytes = 576)

3 2 INDEX (LINE SCAN) OF "KNVP___K" (NO ONE) (cost = 3 = 18 card)

Statistics

----------------------------------------------------------

0 recursive calls

0 db block Gets

Gets 9 compatible

0 physical reads

0 redo size

Autotrace and plan for version 11

--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------

| 0 | SELECT STATEMENT | | 36. 1404 | 2 (0) | 00:00:01 |

|* 2 | TABLE ACCESS BY INDEX ROWID | KNPV | 36. 1404 | 2 (0) | 00:00:01 |

|* 3 | INDEX RANGE SCAN | KNVP___K | 36. | 1 (0) | 00:00:01 |

--------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

2 - filter("VKORG"=:A6 AND "VTWEG"=:A7 AND "SPART"=:A8)

3 - access("MANDT"=:A0 AND ("KUNN2"=:A1 OR "KUNN2"=:A2 OR "KUNN2"=:A3 OR))

(("KUNN2" =: A4 OR "KUNN2" =: A5))

filter ("PARVW" =: A9 or "PARVW" =: "PARVW" = or A10: A11)

Statistics

----------------------------------------------------------

0 recursive calls

0 db block Gets

1009 becomes consistent

0 physical reads

0 redo size

The difference lies in the number of becomes coherent while the plan was that the same so started to play in the V11 environment, try to get it down to

the same number of consistent gets as V9.

It turns out that this seems to be something to change in the optimizer between versions 10.1 and 10.2. I could define optimizer_features_enabled in my session and change the behavior of the query. Do some research on google/support I hit on a quick comment by J. Lewis in this forum who could change the inlist 10.2 optimization. I also found various parameters that would change the behaviour that I did a few tests with them.

The rest of the present is now in version 11 and comes from the loop of PL/SQL which I ran the query 1000 times with.

Results of the v$ sql. The first has optimizer features value enabled 9.2.0.4 the second is nothing has changed.

SQL_ID HASH_VALUE PLAN_HASH_VALUE ELAPSED CPU BUFFER_GETS EXECUTIONS

------------- ---------- --------------- ---------- ---------- ---------- -----------

856081986 4271490216 1000.05.06 cdb5x2hthdjk2 8000

81115016 4271490216 1000 74.40 7p32q202dbdw8 74,43 1009000

Dbms_xplan for the 2 sql_ids.

SQL_ID, cdb5x2hthdjk2, number of children 0

-------------------------------------

SELECT / * + opt_param ('optimizer_features_enable', '9.2.0'), loop_test

* / "KUNNR', 'KUNN2' SAPR3. "KNPV" WHERE "MANDT" =: B12 AND 'KUNN2 '.

IN (: B11,: B10,: B9,: B8,: B7) AND "VKORG" =: B6 AND "VTWEG" =.

: B5 AND "SPART" =: B4 AND 'PARVW' IN (: B3: B2,: B1)

Hash value of plan: 4271490216

--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------

| 0 | SELECT STATEMENT | | | | 3 (100) | |

|* 2 | TABLE ACCESS BY INDEX ROWID | KNPV | 36. 1404 | 3 (0) | 00:00:01 |

|* 3 | INDEX RANGE SCAN | KNVP___K | 36. | 2 (0) | 00:00:01 |

--------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

2. (("VKORG" =: B6 ET "VTWEG" =: B5 ET "SPART» =: B4) filter)

3 - access ("MANDT" =: B12 AND (("KUNN2" =: B11 ou "KUNN2" =: B10 ou "KUNN2" =: B9 ou)))

((("KUNN2" =: B8 OR "KUNN2" =: B7)) AND (("PARVW" =: B3 OU "PARVW" =: B2 OU "PARVW" =: B1)))

SQL_ID, 7p32q202dbdw8, number of children 0

-------------------------------------

SELECT / * + loop_test_11 * / "KUNNR', 'KUNN2' FROM SAPR3. 'KNPV' WHERE

"MANDT" =: B12 AND 'KUNN2' IN (: B11,: B10,: B9,: B8,: B7) AND

"VKORG" =: B6 AND "VTWEG" =: B5 AND "SPART" =: B4 AND 'PARVW' IN (: B3)

(: B2,: B1)

Hash value of plan: 4271490216

--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------

| 0 | SELECT STATEMENT | | | | 2 (100) | |

|* 2 | TABLE ACCESS BY INDEX ROWID | KNPV | 36. 1404 | 2 (0) | 00:00:01 |

|* 3 | INDEX RANGE SCAN | KNVP___K | 36. | 1 (0) | 00:00:01 |

--------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

2. (("VKORG" =: B6 ET "VTWEG" =: B5 ET "SPART» =: B4) filter)

3 - access ("MANDT" =: B12 AND (("KUNN2" =: B11 ou "KUNN2" =: B10 ou "KUNN2" =: B9 ou)))

((("KUNN2" =: B8 OR "KUNN2" =: B7)))

filter (("PARVW" =: B3 ou "PARVW" =: B2 ou "PARVW" =: B1))

Apart from a few differences numbers in terms of the difference is in the predicate section. In version 9, a PARVW is used in predicates access section while the default 11 a version is only used as a filter.

The definition of the index

INDEX_NAME POS COLUMN_NAME

----------------------------------------------------------------

KNVP___K 1 MANDT

KNVP___K 2 KUNN2

KNVP___K 3 PARVW

There are various options to deal with this included two hidden settings _optimizer_better_inlist_costing and _optim_peek_user_binds, both with an initial test that the application run as expected. Before setting either of those that we would have to do more testing and verification with support etc. So I hope a possible different difficulty perhaps in the way that we collect statistics or anything of the sort.

Is there something in the stats to look out for which could contribute to this?

Default statistics collection was 'for all columns size 1'. I played with various other options with no luck yet.

Our test is not finished, but we are a little worried that this could be a more general than just a query question since we have several transactions that show some runtimes longer 11.2

Post edited by: 892918

I have not sent/posted these traces because working with taken in charge, I think he found the problem and have implemented a workaround solution. Fortunately, so far, it's only this one request that we found with this behavior.

This seems to be caused by the fix for bug 4600710 - improve INLISTs costs in some cases (Doc ID 4600710.8). This query does not fit the description exactly but it it closes. index has 3 columns A, B, C with A and C is not selective but B is selective and C is used in a list.

We now have a few options at our disposal to deal with this request and other pop up.

(1) turn off the fix_control for this bug fix.

(2) manually, to lower the distinct values for column B which will use all 3 columns.

(3) use the advice, first_row (1), off _optimizer_better_inlist_costing etc..

(4) creates a new index on C, B and use a reference database to ensure that it is used.

We'll go with option 4 at this stage. It was the less risky option to affect the rest of the environment.

Thanks for your help.

Tags: Database

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Question of the optimizer V9.2-&gt; upgrade 11.2

Plan of version 9 and autotrace.

Autotrace and plan for version 11

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