Not Picking up one Index..!

hi,
I am Using Oracle 10g Version--10.2.0.1.0. I am getting one problem with this query what was the problem i don't understand it is not picking up one index which it is there in indexes. X_PCAT--P_CAT is the index and column from PARTY.
This is the Query..!
SELECT P_CODE , P_NAME, P_OB, P_CAT, P_SUB_CAT, P_BANK, P_PHONE1 || ' ' || P_PHONE2 || ' ' || P_PHONER, P_INTRO1, P_INTRO2, P_INTRO3
FROM SYSADM.PARTY WHERE ( P_CAT = 'DAHMEDABAD' ) AND
( P_OB != 0 OR
EXISTS ( SELECT DISTINCT CB_P_CODE FROM SYSADM.CASH_BOOK WHERE P_CODE = CB_P_CODE) OR
EXISTS ( SELECT DISTINCT B_PARTY FROM SYSADM.BILLS WHERE P_CODE = B_PARTY ) ) ORDER BY 4, 5, 1 ;
this is the Explain Plan for the above query..!
SELECT P_CODE , P_NAME, P_OB, P_CAT, P_SUB_CAT, P_BANK, P_PHONE1 || ' ' || P_PHONE2 || ' ' || P_PHONER, P_INTRO1, P_INTRO2, P_INTRO3
FROM SYSADM.PARTY WHERE ( P_CAT = 'DAHMEDABAD' ) AND
( P_OB != 0 OR
EXISTS ( SELECT DISTINCT CB_P_CODE FROM SYSADM.CASH_BOOK WHERE P_CODE = CB_P_CODE) OR
EXISTS ( SELECT DISTINCT B_PARTY FROM SYSADM.BILLS WHERE P_CODE = B_PARTY ) ) ORDER BY 4, 5, 1
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 62 0.14 1.49 3150 12049 0 1237
total 64 0.14 1.50 3150 12049 0 1237
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 58
Rows Row Source Operation
1237 SORT ORDER BY (cr=12049 pr=3150 pw=0 time=1495964 us)
1237 FILTER (cr=12049 pr=3150 pw=0 time=2962198 us)
2025 TABLE ACCESS FULL PARTY (cr=3527 pr=3150 pw=0 time=2004395 us)
1210 INDEX RANGE SCAN XCB_PARTY (cr=6077 pr=0 pw=0 time=28572 us)(object id 49459)
27 INDEX RANGE SCAN XB_PARTY (cr=2445 pr=0 pw=0 time=11430 us)(object id 49462)
So any wrong in this query.

An explain plan properly created using DBMS_XPLAN.DISPLAY would be immensely helpful.
So would knowing what index it is you think should be used by Oracle to do what?
One thing I can tell you is that the construct P_OB != 0 OR is not one likely to favor index usage unless almost every value in the column is 0 and Oracle's decision to not use an index is affecting you in what way? Is the query taking too long or are you just fixating on the incorrect thought that full table scans are always bad: They are not.
PS: Give serious consideration to patching to 10.2.0.3.

Similar Messages

CBO not picking correct indexes or doing Full Scans

Database version - 10.2.0.4
OS : Solaris 5.8
Storage: SAN
Application : PeopleSoft Financials
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DB server : 12 CPU ( 900 Mghz each ), 36 GB RAM
ASMM - sga_target_size = 5 gb
Locally managed tablespaces - MANUAL
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- dictionary object system stats were last gather in Nov 09
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cascade=> DBMS_STATS.AUTO_CASCADE,
estimate_percent=> DBMS_STATS.AUTO_SAMPLE_SIZE,
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no_invalidate=> DBMS_STATS.AUTO_INVALIDATE,
granularity=> 'AUTO',
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Details :
We are experiencing erratic database performance. It was upgraded from 9i to 10g along with PS software upgrade. A job that runs on one day in 12 hrs(that is high in itself) would take more than 24 hrs another day.
We have Test and Staging envs on other servers which do not have performance issues of production magnitude. The test, staging dbs are clones of prod, created by ftp'ing files from one location to another, not sure if that makes any difference but just pointing out.
On Prod db some symptoms which baffle me are :
1) sql executing for over 40 minutes, check the plan and it is using an "incorrect" index, idx1. Hint sql with "correct" index, idx2, and it runs in few seconds. result set <400 rows. Cost with hint with idx2 is HIGHER. This scenario is still understandable as CBO is likely to pick a lower cost.
- But why is there so much discrepancy in cost and response time?
- what is influencing the CBO to pick an index which is obviously not the fastest response time?
2) sql plan shows FTS , execution time , runs forever . But a hint with index in this case shows the cost is LOWER and response time is in seconds, so why is CBO not even evaluating this index path? Because as I understand the CBO, it will always pick the lower cost plan.
What is influencing the CBO. Is it system stats? or any other database parameter? or the hardware ? the large SGA?? histogram ?? Stats gathering?? is there is any known issue with DBMS_STATS.AUTO_SAMPLE_SIZE and cardinaility?
Where should I put my focus?
What am I looking for ?
I do have Jonathan Lewis's Cost-Based Oracle Fundamentals which I have just started so perhaps I will be enlightened but while I read it, it would be of immense help to get some advice from forum gurus.
At this time I am not posting any exec plan or code, but I can do so if required.
Thanks,
JC

Picking up just a couple of points - the ones about: why can performance change so much from one day to the next, and how can the optimizer miss a plan which (when hinted) shows a lower cost.
NOTE: These are only suggestions that may allow you to look at critical code and recognise the pattern of behaviour
Performance change:
You are using "gather stale" which means tables won't get new statistics is the volume of change since the last collection is "small". But peoplesoft tables can be big, so some tables may need a lot of data to change (which might take several days or weeks) before they get new stats. The 10g optimizer is able to compare the high-values stored with the predicate values supplied in queries, and decide that since the predicate is higher than the known highest value, it should scale down its estimates of data returned. After a few days when the stats haven't changed, the optimizer suddenly gets to the point where the estimated data size is much too small and the plan changes to something that you can see is bad. The typical example here is a date column that increases with time, and a query on "recent data" - the optimizer basically says: "you want 9th Feb - the high value says 28th Jan, there's virtually no data". Keeping date and sequence-based high-values up to date is important. (See dbms_stats.set_column_stats).
Lower cost plans available:
Sometimes this is a bug. Sometimes it's an unlucky side effect. When a query has a large number of tables in a single query block, the optimizer can only examine a limited subset of the possible join orders (for example, a 10-table join has over 3million join orders, and the default limit is 2,000 checked). Because of this limit, Oracle starts working through a few joins orders in a methodical manner, then does a "big jump" to a different set of join orders where it checks a few more join orders, then does another "big jump". It may be that it never gets to your nice plan with the lower cost because it doesn't have time. However, by putting in the hint, you may make some of the orders the optimizer would have examined drop out of the "methodical list" - so it examines a few more in one sequence, or possibly "jumps" to a different sequence that it would not othewise have reached. (I wrote a related blog item some time ago that might make this clearer, even though it's not about exactly the same phenomenon: http://jonathanlewis.wordpress.com/2006/11/03/table-order/ ).
Your recent comment about dynamic sampling is correct, by the way - by default (which for your version is is level 2 as a system parameter) it will only apply for tables which don't have any statistics. It's only for higher levels, or when explicitly hinted for tables, that it can apply to tables with existing statistics.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking"
Carl Sagan
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.

Index not picked when bind parameter can be null?

Hi,
In my query i have a primary key say deptid and has an unique index defined.
when i do a query as
select * from dept where ((deptid = :pDeptId) or (:pDeptId is null))
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Solomon Yakobson wrote:
I purposely chose small table. Yes, optimizer calculated costs are such that FTS cost is same as combined cost of index fast scan + table access by rowid. And that is exactly what I am questioning. Set aside what you call "boundary" cases where rows are sparse enough (e.g. your example with lots of deleted rows) and similar scenarios (e.g. pctfree is very large, etc.) FTS is always less costly than index fast scan + table access by rowid by at least one IO. I understand, I am splitting hairs a bit since the difference is negligible, but still it is a sub-optimal plan.Solomon,
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The cost of the combined index + table access is 2, one I/O for the index, plus one I/O for the table access. So from an optimizer perspective this plan is not sub-optimal, but the superior one, mainly due to the fact that one gets added to the table scan cost from 9i on, and you have the unusual clustering factor of 1.
As you can see, it takes a lot of "boundary" conditions that this happens, and it's all down to the fact that the table is so small, that is has only 4 rows in 5 blocks, and the clustering factor of the index is less than the number of blocks of the table, which is quite unusual. A "optimal" clustering factor usually corresponds to the number of blocks of the table, a "bad" clustering factor corresponds to the number of rows.
Therefore I suggested to "adjust" the clustering factor to a more usual value, but there is actually nothing usual about this test case since you have less rows than blocks.
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Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
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Hi,
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Hello Selva,
your problem here is the decision of the optimizer that does not exactly know the selectivity of the fields.
If your deliveries are normally small (not too many items), then selecting via the document number will be relatively fast.
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Clear the cache and the cookies from websites that cause problems.
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*https://support.mozilla.org/kb/Deleting+cookies
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Hello all,
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Change log entry:
Fix a bug that caused LogFileNotFoundException in rare circumstances for an Environment having one or more Databases configured for duplicates (or one or more SecondaryIndexes with MANY_TO_XXX relationships). The bug only occurs when a single secondary/duplicate key value is associated with a large number of records/entities; specifically, the sub-Btree for a single duplicate key value must have at least 3 levels. SR #16712
Thanks, Jeff, for your help on this.
--mark

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Click the “Kudos Thumbs Up" at the bottom of this post to say
“Thanks” for helping!
Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

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wat if i have lost my iphone and the person delets my icloud ID and enters his own new one can i still look find the phone using Find my iphone using my earlier ID or will it not pick up my phone as he changed the Icloud ID which was associated to me ID

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I have an issue.
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Assigning points is the way to say thanks in SDN.

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If this post is helpful, please mark it as such
Alessandro Cardoso
MVP | Microsoft Heroes | MCT
blog: http://itaustralia.spaces.live.com
http://cardosoalessandro.spaces.live.com

Hi Steven,
I am Alessandro's colleague, I am working with him on these net.msmq issues.
Our configuration includes a transactional queue called Test/Service.svc (unauthenticated,
we shut down all security for the moment...does it matter?) and these attributes on the service:
[ServiceContract]
public interface IService
[OperationContract(IsOneWay=true)]
void ProcessMyMessage(MyClass parameter);
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, TransactionIsolationLevel = IsolationLevel.Serializable, TransactionTimeout = "00:03:00")]
public class Service: IService
[OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)]
public void ProcessMyMessage(MyClass parameter)
//Do some stuff here
The service is hosted on IIS 7.5 under an application called Test (so that the full http address of the service is http://machine/Test/Service.svc).
In the configuration (for both client and service) we specified None for the security mode, "true" value in durable and exactlyOnce
The Net.msmq Listener Adapter windows service is running fine under the Network Service account (the same as our application pool)
Is there something we are missing?
Also, can you explain how a transaction not configured properly can create this behaviour? In my understanding the process of delivering a message happens in 3 steps (I remember a nice picture of this the Juval Lowy book):
1) Transaction 1: client delivers message to local instance of msmq. The transaction rolls back if the message does not get delivered.
2) Transaction 2: the local instance of msmq delivers the message to the remote (service) instance of msmq. The transaction rolls back if the message does not get delivered.
3) Transaction 3: wcf activates my service which picks up the message and process it. The transaction rolls back if the service fails to pick up the message or does not complete the transaction (for example, because of an unhandled exception).
The message gets delivered to the service machine successfully, so I am assuming that steps 1 and 2 are executed correctly. If my service was not configured to handle transaction properly, wcf should still activate it and do something with it. Or at least,
if it doesn't get activated at all, this should be the case even when the application pool is well alive and awake, because it should be a configuration problem. Instead, the service works great if the appPool is alive and it never gets activated when the
appPool is sleeping (absolute nothing in the .svclog trace file generated by the service). Am I saying something wrong?

Multi-column Index vs One index for each column

Hello everyone,
i have one table about 20 000 000 rows, some developers have to generate reports on it and i want to create indexes on this table.
The table has 34 columns, no primary key, no unique keys.
The "where..." clause of the reports usually use 8 columns but some reports uses 8 + some other columns.
can any one help me on what kind of indexes do i have to create?
1. one index for each column used in "where clause"
2. one index for 8 columns and some other indexes for other used columns
3. one index for all columns
or something else etc...
br flag

i have one table about 20 000 000 rows, some developers have to generate reports on it and i want to create indexes on this table.
The table has 34 columns, no primary key, no unique keys.
The "where..." clause of the reports usually use 8 columns but some reports uses 8 + some other columns.
can any one help me on what kind of indexes do i have to create?
1. one index for each column used in "where clause"
2. one index for 8 columns and some other indexes for other used columns
3. one index for all columns
or something else etc...What's the version of your data base? what kind of database you have, DWH or OTLP? The answer might depend on the type of database as far as bitmap indexes might suit or might not depending if you are runing DWH or OLTP kind of database
Let me suppose that you are runing OLTP database and you have a where clause with 8 columns.
1) are all those where clause equalities (where col1 = and col2 =) or there are inequalities?
2) could you evaluate the most repetitive columns?
3) could you know the column that could have the best clustering factor (the column which most follow a certain order in the table)
Based on that I would suggest to create one b-tree index having 8 columns (even though that it seems for me to high) this index should follow the following points:
1) put the most repetitive column at the leading edge (and compress the index if necessary)
2) put the columns that are used in equalitity predicate first
3) put the column having the best clustering factor first
The most precise index you have the best access you could gain.
Of course that you have to know that an index access is not always good and a FULL table scan is not always bad.
Best regards
Mohamed Houri
www.hourim.wordpress.com

Not Picking up one Index..!

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