Explain plan links
Hi all,
i need some informations about "how to check explain plans in oracle". can any body recommend me if there are some good links or books from which i can get the same?
Regards,
SKP
http://tahiti.oracle.com, search for explain plan.
other than that
http://www.psoug.org/reference/explain_plan.html
Geeezzzz
Sybrand Bakker
Senior Oracle DBA
Similar Messages
-
Looking for a book or link to understand indexes stats an explain plan
Please,
Where could I find a good book or link to leran more about indexes statistics:
My Concerns are:
How could I know indexes in the database that are most used,less used and used at all in order to get rid of the last one?
A book or link to fully undertstand how to analyze explain plan give some advices from that.
Thank a lot for your coperationThere is any link where I can find how to analyze explain plan output?Again, the manuals are usually a good place to start:
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14211/ex_plan.htm#g42231 -
SQL Explain Plan tutorial links
Hello experts
I don't know anything about sql explain plan. I would like to learn it. I read several Oracle documents However I don't understand clearly. Do you know any article or powerpoint related to sql explain plan basics for beginners?
Thanks a lot for your help.944258 wrote:
Hello experts
I don't know anything about sql explain plan. I would like to learn it. I read several Oracle documents However I don't understand clearly. Do you know any article or powerpoint related to sql explain plan basics for beginners?
Thanks a lot for your help.http://www.lmgtfy.com/?q=oracle+explain+plan+tutorial -
What is the significance of "cost" column in explain plan
Hi,
Can anyone explain what is the meaning of the values which we get in the cost column in the explain plan..For Ex : Cost : 4500 . What does this value mean...and is it measured in which form of units...i mean seconds,nanoseconds etckingfisher,
Ok one more link for you but I shall quote the text also here,
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/optimops.htm#i82005
The cost is an estimated value proportional to the expected resource use needed to execute the statement with a particular plan. The optimizer calculates the cost of access paths and join orders based on the estimated computer resources, which includes I/O, CPU, and memory.
And few paragraphs down,
13.4.1.3.3 Cost
The cost represents units of work or resource used. The query optimizer uses disk I/O, CPU usage, and memory usage as units of work. So, the cost used by the query optimizer represents an estimate of the number of disk I/Os and the amount of CPU and memory used in performing an operation. The operation can be scanning a table, accessing rows from a table by using an index, joining two tables together, or sorting a row set. The cost of a query plan is the number of work units that are expected to be incurred when the query is executed and its result produced.
The access path determines the number of units of work required to get data from a base table. The access path can be a table scan, a fast full index scan, or an index scan. During table scan or fast full index scan, multiple blocks are read from the disk in a single I/O operation. Therefore, the cost of a table scan or a fast full index scan depends on the number of blocks to be scanned and the multiblock read count value. The cost of an index scan depends on the levels in the B-tree, the number of index leaf blocks to be scanned, and the number of rows to be fetched using the rowid in the index keys. The cost of fetching rows using rowids depends on the index clustering factor. See "Assessing I/O for Blocks, not Rows".
The join cost represents the combination of the individual access costs of the two row sets being joined, plus the cost of the join operation.
Now I guess if you read this part, it should be pretty clear what cost is.Cost is an evlaution of the resource that is estimated by Oracle for every step incurred in the uery execution.There are no of steps and each may involve doing IO,consuming CPU and/or using memory.Cost is a factor which oracle uses combining all of these 3 (depending on the version) together to propose the work done or expected to be done in exeuting a query.So this actualy should represent the time spent exactly on each and every step.That's what the objective frm cost is.But at the moment,this is not there.There amy be a situation that cost is shown as very high but query is working fine.There are woraround which can bring the cost down for example using and tweaking optimizer_index_cost_adj parameter , we can propose oracle regarding our indexes and it may pick up lesser cost evaluation.What is mentioned is that this model is becoming more and more mature and in the next releases, we may see that cost is representing exactly the time that we would spend inthe query.At the moment,its not there.So as Chris mentioned,Tuning for low cost only is not a good way.
I suggest you grab a copy of JL's book.He has explained it much better in his book.
Hope I said some thing useful.
Aman.... -
Explain Plan in Pl/SQL developer tool
How to get the explain plan result of a query in PL/SQL developer tool which has a database link ?
Also, please suggest the min and max Cost, Cardinality and byte values
Thanks859486 wrote:
How to get the explain plan result of a query in PL/SQL developer tool which has a database link ?PL/SQL Developer is a tool written by allround automations.
I suggest you ask how to use that tool vie the support option on their own website/forums:
http://www.allroundautomations.com/plsqldev.html
Also, please suggest the min and max Cost, Cardinality and byte valuesmin cost would be 0
max cost could be anything
cardinality is http://en.wikipedia.org/wiki/Cardinality_%28SQL_statements%29
bytes are the number of estimated bytes involved in the data retrieved/processed. -
Explain me about cost in explain plan.
Hi All,
Please explain me about cost in explain plan.
Below is my explan plans
1. first plan showing cost is more but query is returing the result very fast (564 msecs ) --- local database.
2. second plan showing less cost but result is very slow (14 secs) .
1. local database.
PLAN_TABLE_OUTPUT
| ID | Operation | NAME | ROWS | Bytes | COST |
| 0 | SELECT STATEMENT | | 17 | 2312 | 60 |
| 1 | SORT UNIQUE | | 17 | 2312 | 59 |
| 2 | COUNT STOPKEY | | | | |
| 3 | NESTED LOOPS | | 17 | 2312 | 58 |
| 4 | MAT_VIEW ACCESS BY INDEX ROWID| MV_EDECO_ESONGS | 17 | 1326 | 24 |
| 5 | INDEX RANGE SCAN | IDX_ESNG_REG_TITLE | 21 | | 3 |
| 6 | TABLE ACCESS BY INDEX ROWID | MV_EDECO_ESONGS_TERR_CTRY | 1 | 58 | 2 |
| 7 | INDEX UNIQUE SCAN | IDX_ESNG_TERR_ESNG_ID_1 | 1 | | 1 |
PLAN_TABLE_OUTPUT
| ID | Operation | NAME | ROWS | Bytes | COST |
| 0 | SELECT STATEMENT | | 9 | 1260 | 34 |
| 1 | SORT UNIQUE | | 9 | 1260 | 33 |
| 2 | COUNT STOPKEY | | | | |
| 3 | NESTED LOOPS | | 9 | 1260 | 32 |
| 4 | MAT_VIEW ACCESS BY INDEX ROWID| MV_EDECO_ESONGS | 9 | 720 | 14 |
| 5 | INDEX RANGE SCAN | IDX_ESNG_REG_TITLE | 11 | | 3 |
| 6 | MAT_VIEW ACCESS BY INDEX ROWID| MV_EDECO_ESONGS_TERR_CTRY | 1 | 60 | 2 |
| 7 | INDEX UNIQUE SCAN | PK_EDESONGSTERCTRY_ESONGID | 1 | | 1 |
------------------------------------------------------------------------------------------------Regards,
Rajasekharrajasekhar_n wrote:
Hoek, I have cross checked the results both the querys are precessing same records and returing same result *(both are using DB links).*But you said the first query was on a local database?
If you're using dblinks then it's not local is it! ?:| -
[8i] Can someone help me on using explain plan, tkprof, etc.?
I am trying to follow the instructions at When your query takes too long ...
I am trying to figure out why a simple query takes so long.
The query is:
SELECT COUNT(*) AS tot_rows FROM my_table;It takes a good 5 minutes or so to run (best case), and the result is around 22 million (total rows).
My generic username does not (evidently) allow access to PLAN_TABLE, so I had to log on as SYSTEM to run explain plan. In SQL*Plus, I typed in:
explain plan for (SELECT COUNT(*) AS tot_rows FROM my_table);and the response was "Explained."
Isn't this supposed to give me some sort of output, or am I missing something?
Then, the next step in the post I linked is to use tkprof. I see that it says it will output a file to a path specified in a parameter. The only problem is, I don't have access to the db's server. I am working remotely, and do not have any way to remotely (or directly) access the db server. Is there any way to have the file output to my local machine, or am I just S.O.L.?SomeoneElse used "create table as" (CTAS), wich automatically gathers the stats. You can see the differende before and after stats clearly in this example.
This is the script:
drop table ttemp;
create table ttemp (object_id number not null, owner varchar2(30), object_name varchar2(200));
alter table ttemp add constraint ttemp_pk primary key (object_id);
insert into ttemp
select object_id, owner, object_name
from dba_objects
where object_id is not null;
set autotrace on
select count(*) from ttemp;
exec dbms_stats.gather_table_stats('PROD','TTEMP');
select count(*) from ttemp;And the result:
Table dropped.
Table created.
Table altered.
46888 rows created.
COUNT(*)
46888
1 row selected.
Execution Plan
SELECT STATEMENT Optimizer Mode=CHOOSE
1 SORT AGGREGATE
2 1 TABLE ACCESS FULL PROD.TTEMP
Statistics
1 recursive calls
1 db block gets
252 consistent gets
0 physical reads
120 redo size
0 PX remote messages sent
0 PX remote messages recv'd
0 buffer is pinned count
0 workarea memory allocated
4 workarea executions - optimal
1 rows processed
PL/SQL procedure successfully completed.
COUNT(*)
46888
1 row selected.
Execution Plan
SELECT STATEMENT Optimizer Mode=CHOOSE (Cost=4 Card=1)
1 SORT AGGREGATE (Card=1)
2 1 INDEX FAST FULL SCAN PROD.TTEMP_PK (Cost=4 Card=46 K)
Statistics
1 recursive calls
2 db block gets
328 consistent gets
0 physical reads
8856 redo size
0 PX remote messages sent
0 PX remote messages recv'd
0 buffer is pinned count
0 workarea memory allocated
4 workarea executions - optimal
1 rows processed -
Question regarding using of Explain Plan
Hi. I'm new with Oracle Queries so I have a little obstacles about understanding. I want to learn how to use Explain Plan feature from Oracle
I am using Oracle 9i as back end .
Please tell me how can i use feature of Explain Plan Feature for the below query.
SELECT * FROM emp WHERE empno = 7369
Thanks in advance.[email protected] wrote:
Hi. I'm new with Oracle Queries so I have a little obstacles about understanding. I want to learn how to use Explain Plan feature from Oracle
I am using Oracle 9i as back end .
Please tell me how can i use feature of Explain Plan Feature for the below query.
SELECT * FROM emp WHERE empno = 7369
Kiran,
Firstly , before anything else, I would suggest to change your handle to anything else and remove the email id from it. Its not good to have the id displayed in any public forum.
About the question, unfortunately, its not that easy to answer. To understand explain plan and how to use it, you need to understand that algorithm/mechanism, whatever you feel like saying, that generates it. Because, explain plan is just the outcome of that mechanism, a final product, its the result of some inputs given by you in the form of your query, predicates, joins and their types and that all bring up the explain plan. Explain plan is basically the constitution of some steps which are used /fixed by optimizer to run the query. I would suggest that you read this page from cover to cover to understand some of the steps and their meanings which are shown to you in the plan. I am giving 10g link as this is a more better version of optimizer than the previous ones and I would suggest you to do experiments on 10g only.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/optimops.htm#i21299
And I would suggest that you collect these following books and start reading them. I haven't yet found any thing better than these books.
[Cost Based Oracle Fundamentals (Jonathan Lewis)|http://www.amazon.com/Cost-Based-Oracle-Fundamentals-Experts-Voice/dp/1590596366]
[Troubleshooting Oracle Performance(Christian Antognini )|http://www.amazon.com/Troubleshooting-Oracle-Performance-Christian-Antognini/dp/1590599179/ref=sr_1_1?ie=UTF8&s=books&qid=1240078634&sr=1-1]
[Effectuve Oracle By Design(Tom Kyte)|http://www.amazon.com/Effective-Oracle-Design-Osborne-ORACLE/dp/0072230657/ref=sr_1_1?ie=UTF8&s=books&qid=1240078698&sr=1-1]
It would be real long journey before the mazes of optimizer and explain would be clear so make sure you have patience as well.
HTH
Aman.... -
Explain Plan for Materialized Views in 10g
I am verifying explain plan for few queries on 10g as compared to 9i I was wondering in Materialized Views queries MAT_VIEW ACCESS instead of TABLE ACCESS is it expected behaviour or am missing something?
Couldn't find information in 10g documentation
thanks in advanceI've put together a query for the v$sql_plan in 9iR2.
Depending on what you use, you can probably drop some columns (eg OTHER and partition columns) and you could drive it from the v$session by getting the hash_value from there for the sid you are interested in :
(select * from v$sql_plan where hash_value =
(select sql_hash_value from v$session where sid=:sid))
select level, optimizer, lpad('_',1*(level-1),'_')||operation operation,
options, object_owner||'.'||object_name obj_name, search_columns,
ltrim(to_char(cardinality,'999,999,999')) no_rows,
ltrim(to_char(bytes/1024,'999,999')) kbytes, cost tot_cost,
object_node link, id, parent_id, other_tag||':'||other other,
partition_start, partition_stop, cpu_cost, io_cost,
access_predicates, filter_predicates,
round(temp_space/(1024*1024),2) temp_space_mb
from (select * from v$sql_plan where hash_value = :hash_val)
start with id=0
connect by prior id = parent_id and prior child_number = child_number
order by child_number, id, position; -
I have EXPLAIN PLAN results for some SELECT queries. What is the difference between INDEX UNIQUE SCAN and INDEX RANGE SCAN?
btw it depend not only of your compare operation
but also on index type. See difference for equality between simple index and unique index:
SQL> desc a
Name Null? Type
A NUMBER
SQL> create index aidx on a (a);
Index created.
SQL> set autot traceonly explain
SQL> select * from a where a = 1;
Execution Plan
Plan hash value: 3649445643
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 13 | 1 (0)| 00:00:01 |
|* 1 | INDEX RANGE SCAN| AIDX | 1 | 13 | 1 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - access("A"=1)
SQL> drop index aidx;
Index dropped.
SQL> create unique index aidx on a (a);
Index created.
SQL> select * from a where a = 1;
Execution Plan
Plan hash value: 2717653437
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 13 | 0 (0)| 00:00:01 |
|* 1 | INDEX UNIQUE SCAN| AIDX | 1 | 13 | 0 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - access("A"=1)
SQL> Of course even with unique index >, <, between will have range scan:
SQL> select * from a where a>1;
Execution Plan
Plan hash value: 3649445643
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 13 | 0 (0)| 00:00:01 |
|* 1 | INDEX RANGE SCAN| AIDX | 1 | 13 | 0 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - access("A">1)
SQL> In general index range scan might expect back more than 1 row, while index unique scan usually expect 1 row, however of course in both cases you might get zero rows back.
See my blog entry Where bad performance starts at http://gplivna.blogspot.com/2007/03/where-bad-performance-starts-my.html
it has many links aboput b-tree index internals, I'm quite sure some of them explained these operations more as well.
Gints Plivna
http://www.gplivna.eu -
Hi,
I know we can generate explain plan for queries using "Explain plan" statement or "Autotrace option". I would like to know how can we generate explain plan for oracle procedures.
Thanks in Advance..Check this link very helpful info from Rob
When your query takes too long ...
There are no explain plan for procedures.
MAy be you want to do DBMS_PROFILER for procedures execution -
Explain plan for Query performance
Hi Gurus,
I need to improve the performance of a procedure. The procedure has the below QUery. I dont have Idea on how to imrpove the perf by seeing the explain plan. Can anyone please help me to explain where I need to change the code.
The below are the code and Explain plan for the same.
-----------Code----------------------------
SELECT IV_STORECODE AS STORECODE,
TO_CHAR(RD.ITEMCODE) AS ITEMCODE,
C.ITEMCATEGORYNAME,
ISUB.ITEMSUBCATEGORY1NAME
FROM RECEIPTS R
INNER JOIN RECEIPTDETAILS RD
ON R.RECEIPTID = RD.RECEIPTID
INNER JOIN ITEMCOMPANY IC
ON IC.ITEMCODE = RD.ITEMCODE
INNER JOIN ITEMCATEGORY C
ON IC.ITEMCATEGORY = C.ITEMCATEGORYID
LEFT OUTER JOIN ITEMSUBCATEGORY1 ISUB
ON ISUB.ITEMSUBCATEGORY1ID = IC.ITEMSUBCATEGORY1
AND ISUB.ITEMSUBCATEGORY1ID IN
(SELECT ITEMSUBCATEGORY1ID
FROM ITEMSUBCATEGORY1
WHERE ITEMCATEGORYID = IV_ITEMCATEGORY)
INNER JOIN STORE SE
ON SE.STORECODE = R.STORECODE
WHERE R.STORECODE = IV_STORECODE
AND SE.HOSPITALID = IV_HOSPITALID
AND TRUNC(R.CREATEDDATE) BETWEEN V_FROMDATE AND
V_TODATE
AND R.STATUSID NOT IN (99, 5)
AND
(IV_DRUGTYPE IS NULL OR
IC.DRUGTYPECATEGORYID = IV_DRUGTYPE)
UNION
SELECT IV_STORECODE AS STORECODE,
TO_CHAR(STD.ITEMCODE) AS ITEMCODE,
C.ITEMCATEGORYNAME,
ISUB.ITEMSUBCATEGORY1NAME
FROM STOCKTRANSACTION ST
INNER JOIN STOCKTRANSACTIONDETAILS STD
ON ST.STOCKTRANSACTIONID = STD.STOCKTRANSACTIONID
INNER JOIN ITEMCOMPANY IC
ON IC.ITEMCODE = STD.ITEMCODE
INNER JOIN ITEMCATEGORY C
ON IC.ITEMCATEGORY = C.ITEMCATEGORYID
LEFT OUTER JOIN ITEMSUBCATEGORY1 ISUB
ON ISUB.ITEMSUBCATEGORY1ID = IC.ITEMSUBCATEGORY1
AND ISUB.ITEMSUBCATEGORY1ID IN
(SELECT ITEMSUBCATEGORY1ID
FROM ITEMSUBCATEGORY1
WHERE ITEMCATEGORYID = IV_ITEMCATEGORY)
INNER JOIN STORE SE
ON SE.STORECODE = ST.STORECODE
WHERE ST.STORECODE = IV_STORECODE
AND SE.HOSPITALID = IV_HOSPITALID
AND TRUNC(ST.CREATEDDATE) BETWEEN V_FROMDATE AND
V_TODATE
AND ST.STATUS <> 99
AND STD.ITEMCODE NOT LIKE '%#%'
AND
(IV_DRUGTYPE IS NULL OR
IC.DRUGTYPECATEGORYID = IV_DRUGTYPE)
UNION
SELECT D.STORECODE,
TO_CHAR(D.ITEMCODE) AS ITEMCODE,
C.ITEMCATEGORYNAME,
ISUB.ITEMSUBCATEGORY1NAME
FROM DAILYINVENTORY D
INNER JOIN ITEMCOMPANY IC
ON IC.ITEMCODE = D.ITEMCODE
INNER JOIN ITEMCATEGORY C
ON IC.ITEMCATEGORY = C.ITEMCATEGORYID
LEFT OUTER JOIN ITEMSUBCATEGORY1 ISUB
ON ISUB.ITEMSUBCATEGORY1ID = IC.ITEMSUBCATEGORY1
AND ISUB.ITEMSUBCATEGORY1ID IN
(SELECT ITEMSUBCATEGORY1ID
FROM ITEMSUBCATEGORY1
WHERE ITEMCATEGORYID = IV_ITEMCATEGORY)
INNER JOIN STORE SE
ON SE.STORECODE = D.STORECODE
WHERE D.STORECODE = IV_STORECODE
AND SE.HOSPITALID = IV_HOSPITALID
AND TRUNC(D.UPDATEDDATE) <= V_TODATE
AND D.QTY > 0
AND D.ITEMCODE NOT LIKE '%#%'
AND C.ITEMCATEGORYID = IV_ITEMCATEGORY
AND (IV_DRUGTYPE IS NULL OR
IC.DRUGTYPECATEGORYID = IV_DRUGTYPE)
AND (IV_SUBITEMCATEGORY IS NULL OR
ISUB.ITEMSUBCATEGORY1ID = IV_SUBITEMCATEGORY) Will post the explain plan ..
Thanks in advance..Ensure you also include all the other information people will need to help you, e.g. database version, table structures/relationships and cardinalities, row counts etc.
See the two threads linked to in the FAQ: {message:id=9360003} -
What is the "cost" in an explain plan
We are using Oracle 10 with the cost based optimizer in our PeopleSoft system. When we come across long running SQL statements we run explain plans. I have heard different explanations of what cost means. The latest I heard is disk access time and a cost of one being 15 milliseconds for one disk access. So if a select statement has a cost of, say 1000, then that means it is taking .015 X 1000 or 15 seconds to bring in all of the rows - Is this accurate.
Thanks,
Allen Cunningham
DBA, Sonoma State UniversityThat question is not directly linked to Peoplesoft where you initially posted your thread.
Anyway, the situation is not that simple as you said, have a look to the Jonathan Lewis' blog entry :
http://jonathanlewis.wordpress.com/2006/12/11/cost-is-time/
Nicolas.
+<thread moved to Database General Forum: General Database Discussions -
We are using Oracle 8.1.7.2, but this problem seems pretty generic across most of the versions.
The situation: We have several queries that access data in two different databases, across a dblink. These queries both do joins across the dblink, and also utilize subselects to pull or push data across the link.
The problem: When we run Explain against these queries, it only states "Remote", and shows the carinality of rows returned, in the explain plan for that portion of the query that is run on the remote database through the dblink.
Obviously, for those queries using sub-selects we could manually split the query and run each half in the database where the objects reside. But for the complex queries doing joins across the link, we cannot split the query to explain it in this way.
The question: Is there a way to make the Explain function provide an access path map for these kinds of queries? If not, are there any other tools that would perform explains (or similar functionality) on queries accessing two databases?
Thanks for the assistance.
ScottYou're right. My guess is that the current db is not able to retrieve the details of the remote table in the data dictionary. And hence instead of table name, only REMOTE is displayed.
-
Explain plan cardinallity is way off compared to actual rows being returned
Database version 11.2.0.3
We have a small but rapidly growing datawarehouse which has OBIEE as its front end reporting tool. Our DBA has set up a automatic stats gathering method in OEM and we can see that it run and gathers stats on stale objects on a regular basis. So we know the statistics are upto date.
In checking some slow queries I can see that the cardinality being reported in explain plans is way off compared to what is actually being returned.
For example the actual number of rows returned are 8000 but the cardinality estimate is > 300,000.
Now as per an Oracle White paper(The Oracle Optimizer Explain the Explain Plan) having "multiple single column predicates on a single table" can affect cardinality estimates and in case of our query that is true. Here is the "WHERE Clause section" of the query
SQL> select D1.c1 as c1,
2 D1.c2 as c2,
3 D1.c3 as c3,
4 D1.c4 as c4,
5 D1.c5 as c5,
6 D1.c6 as c6,
7 D1.c7 as c7,
8 D1.c8 as c8,
9 D1.c9 as c9,
10 D1.c10 as c10,
11 D1.c11 as c11,
12 D1.c12 as c12,
13 D1.c13 as c13,
14 D1.c14 as c14,
15 D1.c15 as c15,
16 D1.c16 as c16
17 from (select D1.c4 as c1,
18 D1.c5 as c2,
19 D1.c3 as c3,
20 D1.c1 as c4,
21 D1.c6 as c5,
22 D1.c7 as c6,
23 D1.c2 as c7,
24 D1.c8 as c8,
25 D1.c9 as c9,
26 D1.c10 as c10,
27 D1.c9 as c11,
28 D1.c11 as c12,
29 D1.c2 as c13,
30 D1.c2 as c14,
31 D1.c12 as c15,
32 'XYZ' as c16,
33 ROW_NUMBER() OVER(PARTITION BY D1.c2, D1.c3, D1.c4, D1.c5, D1.c6, D1.c7, D1.c8, D1.c9, D1.c10, D1.c11, D1.c12 ORDER BY D1.c2 ASC, D1.c3 ASC, D1.c4 ASC, D1.c5 ASC, D1.c6 ASC, D1.c
ASC, D1.c8 ASC, D1.c9 ASC, D1.c10 ASC, D1.c11 ASC, D1.c12 ASC) as c17
34 from (select distinct D1.c1 as c1,
35 D1.c2 as c2,
36 'CHANNEL1' as c3,
37 D1.c3 as c4,
38 D1.c4 as c5,
39 D1.c5 as c6,
40 D1.c6 as c7,
41 D1.c7 as c8,
42 D1.c8 as c9,
43 D1.c9 as c10,
44 D1.c10 as c11,
45 D1.c11 as c12
46 from (select sum(T610543.GLOBAL1_EXCHANGE_RATE * case
47 when T610543.X_ZEB_SYNC_EBS_FLG = 'Y' then
48 T610543.X_ZEB_AIA_U_REVN_AMT
49 else
50 0
51 end) as c1,
52 T536086.X_ZEBRA_TERRITORY as c2,
53 T526821.LEVEL9_NAME as c3,
54 T526821.LEVEL1_NAME as c4,
55 T577698.PER_NAME_FSCL_YEAR as c5,
56 T577698.FSCL_QTR as c6,
57 T31796.X_ZEBRA_TERRITORY as c7,
58 T31796.X_OU_NUM as c8,
59 T664055.TERRITORY as c9,
60 T536086.X_OU_NUM as c10,
61 T526821.LEVEL4_NAME as c11
62 from W_INT_ORG_D T613144 /* Dim_ZEB_W_INT_ORG_D_POS_Client_Attr_Direct */,
63 W_ZEBRA_REGION_D T664055 /* Dim_ZEB_W_ZEBRA_REGION_D_POS_Client_Direct */,
64 W_DAY_D T577698 /* Dim_ZEB_W_DAY_D_Order_Invoice_Date */,
65 WC_PRODUCT_HIER_DH T526821 /* Dim_WC_PRODUCT_HIER_DH */,
66 W_PRODUCT_D T32069 /* Dim_W_PRODUCT_D */,
67 W_ORG_D T31796,
68 W_ORG_D T536086 /* Dim_ZEB_W_ORG_D_Reseller */,
69 W_ORDERITEM_TMP_F T610543 /* Fact_ZEB_W_ORDERITEM_F_Direct */
70 where (T610543.PR_OWNER_BU_WID = T613144.ROW_WID and
71 T577698.ROW_WID =
72 T610543.X_ZEB_AIA_TRXN_DT_WID and
73 T32069.ROW_WID = T526821.PROD_WID and
74 T32069.ROW_WID = T610543.ROOT_LN_PROD_WID and
75 T536086.ROW_WID = T610543.ACCNT_WID and
76 T31796.DATASOURCE_NUM_ID =
77 T610543.DATASOURCE_NUM_ID and
78 T31796.INTEGRATION_ID = T610543.VIS_PR_BU_ID and
79 T536086.DELETE_FLG = 'N' and
80 T610543.X_ZEB_DELETE_FLG = 'N' and
81 T613144.X_ZEB_REGION_WID = T664055.ROW_WID and
82 T577698.FSCL_DAY_OF_YEAR < 97 and
83 '2006' < T577698.PER_NAME_FSCL_YEAR and
84 T536086.X_OU_NUM <> '11073' and
85 T536086.X_ZEBRA_TERRITORY !=
86 'XX23' and
87 T536086.X_OU_NUM != '56791647728774' and
88 T536086.X_OU_NUM != '245395890' and
89 T536086.X_ZEBRA_TERRITORY !=
90 'STRATEGIC ACCTS 2' and
91 T526821.LEVEL2_NAME != 'Charges' and
92 T526821.LEVEL9_NAME != 'Unspecified' and
93 T536086.X_ZEBRA_TERRITORY !=
94 'XX1' and T536086.X_ZEBRA_TERRITORY !=
95 'XX2' and T536086.X_ZEBRA_TERRITORY !=
96 'XX3' and T536086.X_ZEBRA_TERRITORY !=
97 'XX4' and
98 (T536086.X_ZEBRA_TERRITORY in
99 ( ... In List of 22 values )) and
125 T32069.X_ZEB_EBS_PRODUCT_TYPE is null)
126 group by T31796.X_ZEBRA_TERRITORY,
127 T31796.X_OU_NUM,
128 T526821.LEVEL1_NAME,
129 T526821.LEVEL4_NAME,
130 T526821.LEVEL9_NAME,
131 T536086.X_OU_NUM,
132 T536086.X_ZEBRA_TERRITORY,
133 T577698.FSCL_QTR,
134 T577698.PER_NAME_FSCL_YEAR,
135 T664055.TERRITORY) D1) D1) D1
136 where (D1.c17 = 1)
137 /
Elapsed: 00:00:35.19
Execution Plan
Plan hash value: 3285002974
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop | TQ |IN-OUT| PQ Distrib |
| 0 | SELECT STATEMENT | | 2145M| 2123G| | 612K (1)| 03:03:47 | | | | | |
| 1 | PX COORDINATOR | | | | | | | | | | | |
| 2 | PX SEND QC (RANDOM) | :TQ10012 | 2145M| 2123G| | 612K (1)| 03:03:47 | | | Q1,12 | P->S | QC (RAND) |
|* 3 | VIEW | | 2145M| 2123G| | 612K (1)| 03:03:47 | | | Q1,12 | PCWP | |
|* 4 | WINDOW NOSORT | | 2145M| 421G| | 612K (1)| 03:03:47 | | | Q1,12 | PCWP | |
| 5 | SORT GROUP BY | | 2145M| 421G| 448G| 612K (1)| 03:03:47 | | | Q1,12 | PCWP | |
| 6 | PX RECEIVE | | 2145M| 421G| | 1740 (11)| 00:00:32 | | | Q1,12 | PCWP | |
| 7 | PX SEND HASH | :TQ10011 | 2145M| 421G| | 1740 (11)| 00:00:32 | | | Q1,11 | P->P | HASH |
|* 8 | HASH JOIN BUFFERED | | 2145M| 421G| | 1740 (11)| 00:00:32 | | | Q1,11 | PCWP | |
| 9 | PX RECEIVE | | 268K| 7864K| | 93 (2)| 00:00:02 | | | Q1,11 | PCWP | |
| 10 | PX SEND HASH | :TQ10009 | 268K| 7864K| | 93 (2)| 00:00:02 | | | Q1,09 | P->P | HASH |
| 11 | PX BLOCK ITERATOR | | 268K| 7864K| | 93 (2)| 00:00:02 | | | Q1,09 | PCWC | |
| 12 | TABLE ACCESS FULL | W_ORG_D | 268K| 7864K| | 93 (2)| 00:00:02 | | | Q1,09 | PCWP | |
| 13 | PX RECEIVE | | 345K| 59M| | 1491 (2)| 00:00:27 | | | Q1,11 | PCWP | |
| 14 | PX SEND HASH | :TQ10010 | 345K| 59M| | 1491 (2)| 00:00:27 | | | Q1,10 | P->P | HASH |
|* 15 | HASH JOIN BUFFERED | | 345K| 59M| | 1491 (2)| 00:00:27 | | | Q1,10 | PCWP | |
| 16 | PX RECEIVE | | 1321 | 30383 | | 2 (0)| 00:00:01 | | | Q1,10 | PCWP | |
| 17 | PX SEND BROADCAST | :TQ10006 | 1321 | 30383 | | 2 (0)| 00:00:01 | | | Q1,06 | P->P | BROADCAST |
| 18 | PX BLOCK ITERATOR | | 1321 | 30383 | | 2 (0)| 00:00:01 | | | Q1,06 | PCWC | |
| 19 | TABLE ACCESS FULL | W_ZEBRA_REGION_D | 1321 | 30383 | | 2 (0)| 00:00:01 | | | Q1,06 | PCWP | |
|* 20 | HASH JOIN | | 345K| 52M| | 1488 (2)| 00:00:27 | | | Q1,10 | PCWP | |
| 21 | JOIN FILTER CREATE | :BF0000 | 9740 | 114K| | 2 (0)| 00:00:01 | | | Q1,10 | PCWP | |
| 22 | PX RECEIVE | | 9740 | 114K| | 2 (0)| 00:00:01 | | | Q1,10 | PCWP | |
| 23 | PX SEND HASH | :TQ10007 | 9740 | 114K| | 2 (0)| 00:00:01 | | | Q1,07 | P->P | HASH |
| 24 | PX BLOCK ITERATOR | | 9740 | 114K| | 2 (0)| 00:00:01 | | | Q1,07 | PCWC | |
| 25 | TABLE ACCESS FULL | W_INT_ORG_D | 9740 | 114K| | 2 (0)| 00:00:01 | | | Q1,07 | PCWP | |
| 26 | PX RECEIVE | | 344K| 47M| | 1486 (2)| 00:00:27 | | | Q1,10 | PCWP | |
| 27 | PX SEND HASH | :TQ10008 | 344K| 47M| | 1486 (2)| 00:00:27 | | | Q1,08 | P->P | HASH |
| 28 | JOIN FILTER USE | :BF0000 | 344K| 47M| | 1486 (2)| 00:00:27 | | | Q1,08 | PCWP | |
|* 29 | HASH JOIN BUFFERED | | 344K| 47M| | 1486 (2)| 00:00:27 | | | Q1,08 | PCWP | |
| 30 | JOIN FILTER CREATE | :BF0001 | 35290 | 964K| | 93 (2)| 00:00:02 | | | Q1,08 | PCWP | |
| 31 | PX RECEIVE | | 35290 | 964K| | 93 (2)| 00:00:02 | | | Q1,08 | PCWP | |
| 32 | PX SEND HASH | :TQ10004 | 35290 | 964K| | 93 (2)| 00:00:02 | | | Q1,04 | P->P | HASH |
| 33 | PX BLOCK ITERATOR | | 35290 | 964K| | 93 (2)| 00:00:02 | | | Q1,04 | PCWC | |
|* 34 | TABLE ACCESS FULL | W_ORG_D | 35290 | 964K| | 93 (2)| 00:00:02 | | | Q1,04 | PCWP | |
| 35 | PX RECEIVE | | 344K| 38M| | 1392 (2)| 00:00:26 | | | Q1,08 | PCWP | |
| 36 | PX SEND HASH | :TQ10005 | 344K| 38M| | 1392 (2)| 00:00:26 | | | Q1,05 | P->P | HASH |
| 37 | JOIN FILTER USE | :BF0001 | 344K| 38M| | 1392 (2)| 00:00:26 | | | Q1,05 | PCWP | |
|* 38 | HASH JOIN BUFFERED | | 344K| 38M| | 1392 (2)| 00:00:26 | | | Q1,05 | PCWP | |
| 39 | PX RECEIVE | | 93791 | 4671K| | 7 (0)| 00:00:01 | | | Q1,05 | PCWP | |
| 40 | PX SEND HASH | :TQ10001 | 93791 | 4671K| | 7 (0)| 00:00:01 | | | Q1,01 | P->P | HASH |
| 41 | PX BLOCK ITERATOR | | 93791 | 4671K| | 7 (0)| 00:00:01 | | | Q1,01 | PCWC | |
|* 42 | TABLE ACCESS FULL | WC_PRODUCT_HIER_DH | 93791 | 4671K| | 7 (0)| 00:00:01 | | | Q1,01 | PCWP | |
|* 43 | HASH JOIN | | 894K| 57M| | 1384 (2)| 00:00:25 | | | Q1,05 | PCWP | |
| 44 | JOIN FILTER CREATE | :BF0002 | 243K| 1904K| | 48 (3)| 00:00:01 | | | Q1,05 | PCWP | |
| 45 | PX RECEIVE | | 243K| 1904K| | 48 (3)| 00:00:01 | | | Q1,05 | PCWP | |
| 46 | PX SEND HASH | :TQ10002 | 243K| 1904K| | 48 (3)| 00:00:01 | | | Q1,02 | P->P | HASH |
| 47 | PX BLOCK ITERATOR | | 243K| 1904K| | 48 (3)| 00:00:01 | | | Q1,02 | PCWC | |
|* 48 | TABLE ACCESS FULL | W_PRODUCT_D | 243K| 1904K| | 48 (3)| 00:00:01 | | | Q1,02 | PCWP | |
| 49 | PX RECEIVE | | 894K| 50M| | 1336 (2)| 00:00:25 | | | Q1,05 | PCWP | |
| 50 | PX SEND HASH | :TQ10003 | 894K| 50M| | 1336 (2)| 00:00:25 | | | Q1,03 | P->P | HASH |
| 51 | JOIN FILTER USE | :BF0002 | 894K| 50M| | 1336 (2)| 00:00:25 | | | Q1,03 | PCWP | |
|* 52 | HASH JOIN | | 894K| 50M| | 1336 (2)| 00:00:25 | | | Q1,03 | PCWP | |
| 53 | PX RECEIVE | | 292 | 3504 | | 136 (0)| 00:00:03 | | | Q1,03 | PCWP | |
| 54 | PX SEND BROADCAST LOCAL| :TQ10000 | 292 | 3504 | | 136 (0)| 00:00:03 | | | Q1,00 | P->P | BCST LOCAL |
| 55 | PX BLOCK ITERATOR | | 292 | 3504 | | 136 (0)| 00:00:03 | | | Q1,00 | PCWC | |
|* 56 | TABLE ACCESS FULL | W_DAY_D | 292 | 3504 | | 136 (0)| 00:00:03 | | | Q1,00 | PCWP | |
| 57 | PX BLOCK ITERATOR | | 4801K| 215M| | 1199 (2)| 00:00:22 | 1 | 11 | Q1,03 | PCWC | |
|* 58 | TABLE ACCESS FULL | W_ORDERITEM_TMP_F | 4801K| 215M| | 1199 (2)| 00:00:22 | 1 | 44 | Q1,03 | PCWP | |
Note
- dynamic sampling used for this statement (level=5)
Statistics
498 recursive calls
2046 db block gets
1193630 consistent gets
74398 physical reads
0 redo size
655170 bytes sent via SQL*Net to client
11761 bytes received via SQL*Net from client
541 SQL*Net roundtrips to/from client
64 sorts (memory)
0 sorts (disk)
8090 rows processed
SQL>So my question is if, cardinality estimates are way off, is that an indicator that the explain plans being generated are sub-optimal?
Can you provide me with some tips or links to blog post or books on how I approach tuning such queries where cardinalities are not good?
Edited by: qqq on Apr 7, 2013 2:27 PMAs already asked in your other thread:
Please see the FAQ for how to post a tuning request and the information that you need to provide.
Part of that information is:
1. DDL for the table and indexes
2. The query being used
3. row counts for the table and for the predicates used in the query
4. info about stats. You did update the table and index stats didn't you?
5. The 'actual' execution plans.
An explain plan just shows what Oracle 'thinks' it is going to do. The actual plans show what Oracle actually 'did' do. Just because Oracle expected to save doesn't mean the savings were actually achieved.
When you post the plans use on the line before and on the line after to preserve formatting.
Your partial code is virtually unusable because of the missing conditions in the predicates. You need to use '!=' for 'not equals' if that's what those missing conditions are.
Please edit your post to use code tags, add the missing conditions and provide the other information needed for a tuning request.
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