Performance tuning - bad sql

Problem: Simple select query accessing and joining four tables is using 6+mins.
Database Version : 11g
When run the 2nd time - it completes in secs(shd be due to explain plan changed by 11g feature).
Without OEM gridcontrol - can we analyse what is causing the issue?
Thanks.

Yes.
You can look at all kinds of session statistics. It may be what is happening is the first time you have to load up the buffer cache. There's all kinds of other possibilities. Please see Re: 3. How to improve the performance of my query? / My query is running slow.

Similar Messages

Need clear steps for doing performance tuning on SQL Server 2008 R2 (DB Engine, Reporting Services and Integration Services)

We have to inverstigate about a reporting solution where things are getting slow (may be material, database design, network matters).
I have red a lot in MSDN and some books about performance tuning on SQL Server 2008 R2 (or other) but frankly, I feel a little lost in all that stuff
I'am looking for practical steps in order to do the tuning. Someone had like a recipe for that : a success story...
My (brain storm) Methodology should follow these steps:
Resource bottlenecks: CPU, memory, and I/O bottlenecks
tempdb bottlenecks
A slow-running user query : Missing indexes, statistics,...
Use performance counters : there are many, can one give us the list of the most important
how to do fine tuning about SQL Server configuration
SSRS, SSIS configuration ?
And do the recommandations.
Thanks
"there is no Royal Road to Mathematics, in other words, that I have only a very small head and must live with it..."
Edsger W. Dijkstra

Hello,
There is no clear defined step which can be categorized as step by step to performance tuning.Your first goal is to find out cause or drill down to factor causing slowness of SQL server it can be poorly written query ,missing indexes,outdated stats.RAM crunch
CPU crunch so on and so forth.
I generally refer to below doc for SQL server tuning
http://technet.microsoft.com/en-us/library/dd672789(v=sql.100).aspx
For SSIS tuning i refer below doc.
http://technet.microsoft.com/library/Cc966529#ECAA
http://msdn.microsoft.com/en-us/library/ms137622(v=sql.105).aspx
When I face issue i generally look at wait stats ,wait stats give you idea about on what resource query was waiting.
--By Jonathan KehayiasSELECT TOP 10
wait_type ,
max_wait_time_ms wait_time_ms ,
signal_wait_time_ms ,
wait_time_ms - signal_wait_time_ms AS resource_wait_time_ms ,
100.0 * wait_time_ms / SUM(wait_time_ms) OVER ( )
AS percent_total_waits ,
100.0 * signal_wait_time_ms / SUM(signal_wait_time_ms) OVER ( )
AS percent_total_signal_waits ,
100.0 * ( wait_time_ms - signal_wait_time_ms )
/ SUM(wait_time_ms) OVER ( ) AS percent_total_resource_waits
FROM sys.dm_os_wait_stats
WHERE wait_time_ms > 0 -- remove zero wait_time
AND wait_type NOT IN -- filter out additional irrelevant waits
( 'SLEEP_TASK', 'BROKER_TASK_STOP', 'BROKER_TO_FLUSH',
'SQLTRACE_BUFFER_FLUSH','CLR_AUTO_EVENT', 'CLR_MANUAL_EVENT',
'LAZYWRITER_SLEEP', 'SLEEP_SYSTEMTASK', 'SLEEP_BPOOL_FLUSH',
'BROKER_EVENTHANDLER', 'XE_DISPATCHER_WAIT', 'FT_IFTSHC_MUTEX',
'CHECKPOINT_QUEUE', 'FT_IFTS_SCHEDULER_IDLE_WAIT',
'BROKER_TRANSMITTER', 'FT_IFTSHC_MUTEX', 'KSOURCE_WAKEUP',
'LAZYWRITER_SLEEP', 'LOGMGR_QUEUE', 'ONDEMAND_TASK_QUEUE',
'REQUEST_FOR_DEADLOCK_SEARCH', 'XE_TIMER_EVENT', 'BAD_PAGE_PROCESS',
'DBMIRROR_EVENTS_QUEUE', 'BROKER_RECEIVE_WAITFOR',
'PREEMPTIVE_OS_GETPROCADDRESS', 'PREEMPTIVE_OS_AUTHENTICATIONOPS',
'WAITFOR', 'DISPATCHER_QUEUE_SEMAPHORE', 'XE_DISPATCHER_JOIN',
'RESOURCE_QUEUE' )
ORDER BY wait_time_ms DESC
use below link to analyze wait stats
http://www.sqlskills.com/blogs/paul/wait-statistics-or-please-tell-me-where-it-hurts/
HTH
PS: for reporting services you can post in SSRS forum
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers

Performance Tuning of SQL Stmts.

Hi all,
I have some queries to be tuned, what steps should i follow?
I have to get the statistics for both Rule based & cost based
optimizer.
Thnx in advance
Bye

Hello,
The following are the steps followed normally for tuning.
1. identify the queries which are the bottlenecks for performance
using some tools like SQL Lab,ezsql etc., (i presume u have
these queries identified already). These tools also explain the
plan of execution of the SQL statements. SO, check out the
EXPLAIN PLAN and identify the problem. SQLLAb gives you pretty
good information. See if there are any full table scans.
2. Before going to the optimiser tuning, check for simple things
like indexes. Are all the tables involved in these queries
indexed correctly? The order of query and that of the the indexes
should match.
3. There are scripts available to get the hit ratios for library
cache,buffer cache etc., Check if there are any resource
contentions.
4. If the queries involve joins of many tables, see if they are
indexed properly. It is normally recommended that the indexes
should go into a separate tablespace.
5.Check if there are open cursors.
6. If all the above are through, then try using the optimiser
data for tuning.

Performance tuning in SQL query using join of views

Hi,
Am trying to tune a query of the format
select ........ from view1,view2
where view1.keyfield = view2.keyfield
The base tables of the views view1 and view2 have indexes specified on 'keyfield'.
However, when I do an explain plan of the query, Full table scan of those base tables are performed.
Even tried using Hints in this query to force Oracle to use those indexes, but still not successful.
Any pointers on how to tune this kind of query would be highly welcome.
Regards,
Baish

If your query is really of the same form as you posted, then full table scans then a hash or merge join may be the most efficient plan.
You are asking for all of the rows from view1 and the matching rows from view2, because of this, Oracle dedcided that the cost of full table scans using multi-block reads is cheaper than using single block reads to get the rowids from the index, then single block reads to get the rows from the table.
FULL SCAN <> BAD
John

Performance tuning of sql query with multiple joins

My query takes at least half an hour to execute and the number of records returned are approx 1 lakh records.
Structure of tables are:
tblSession : ID,option1,option2,option3,option4,option5,option6,option7,option8,option9.
tblOption : ID, labelID
tblLabelDetail : ID, LABELID, text
optionID 1 to optionID9 are Foreign keys to table tblOption.ID
My query is as below :
select
session.ID
,session.tstamp
,session.score
,session.hid1
,session.hID2
,session.hID3
,session.collectionID
,session.consumerID
,session.langID
,cons_cust.text1 as customCons_text1,
cons_cust.text2 as customCons_text2,
cons_cust.text3 as customCons_text3,
cons_cust.text4 as customCons_text4,
cons_cust.text5 as customCons_text5,
cons_cust.text6 as customCons_text6,
cons_cust.text7 as customCons_text7,
cons_cust.text8 as customCons_text8,
cons_cust.text9 as customCons_text9,
ld_cons1.text as customCons_option1GUID,
ld_cons2.text as customCons_option2GUID,
ld_cons3.text as customCons_option3GUID,
ld_cons4.text as customCons_option4GUID ,
ld_cons5.text as customCons_option5GUID,
ld_cons6.text as customCons_option6GUID,
ld_cons7.text as customCons_option7GUID,
ld_cons8.text as customCons_option8GUID,
ld_cons9.text as customCons_option9GUID,
--session
session_cust.text1 as session_cust_text1,
session_cust.text2 as session_cust_text2,
session_cust.text3 as session_cust_text3,
session_cust.text4 as session_cust_text4,
session_cust.text5 as session_cust_text5,
session_cust.text6 as session_cust_text6,
session_cust.text7 as session_cust_text7,
session_cust.text8 as session_cust_text8,
session_cust.text9 as session_cust_text9,
ld_sess1.text as session_cust_option1GUID,
ld_sess2.text as session_cust_option2GUID,
ld_sess3.text as session_cust_option3GUID,
ld_sess4.text as session_cust_option4GUID,
ld_sess5.text as session_cust_option5GUID,
ld_sess6.text as session_cust_option6GUID,
ld_sess7.text as session_cust_option7GUID,
ld_sess8.text as session_cust_option8GUID,
ld_sess9.text as session_cust_option9GUID,
session_cust.tStamp1,
session_cust.tStamp2
from mvSession session with (noexpand)
inner join tblCollection c on c.ID=session.collectionID AND c.templateID = 405
left join tblConsumer cons on cons.ID=session.consumerID and cons.sessionYM between 601 and 1412 and cons.sID=105
left join vCustomConsumer cons_cust on cons_cust.sessionYM between 601 and 1412 and cons_cust.sID=105 and cons_cust.ID=cons.ID
left join tbloption o_cons1 on o_cons1.id = cons_cust.option1 and o_cons1.sid = 105
left join tblLabelDetail ld_cons1 on ld_cons1.labelID = o_cons1.labelID and ld_cons1.langId = 1 and ld_cons1.eid = 107
left join tbloption o_cons2 on o_cons2.id = cons_cust.option2 and o_cons2.sid = 105
left join tblLabelDetail ld_cons2 on ld_cons2.labelID = o_cons2.labelID and ld_cons2.langId = 1 and ld_cons2.eid = 107
left join tbloption o_cons3 on o_cons3.id = cons_cust.option3 and o_cons3.sid = 105
left join tblLabelDetail ld_cons3 on ld_cons3.labelID = o_cons1.labelID and ld_cons3.langId = 1 and ld_cons3.eid = 107
left join tbloption o_cons4 on o_cons4.id = cons_cust.option4 and o_cons4.sid = 105
left join tblLabelDetail ld_cons4 on ld_cons4.labelID = o_cons4.labelID and ld_cons4.langId = 1 and ld_cons4.eid = 107
left join tbloption o_cons5 on o_cons5.id = cons_cust.option5 and o_cons5.sid = 105
left join tblLabelDetail ld_cons5 on ld_cons5.labelID = o_cons5.labelID and ld_cons5.langId = 1 and ld_cons5.eid = 107
left join tbloption o_cons6 on o_cons6.id = cons_cust.option6 and o_cons6.sid = 105
left join tblLabelDetail ld_cons6 on ld_cons6.labelID = o_cons6.labelID and ld_cons6.langId = 1 and ld_cons6.eid = 107
left join tbloption o_cons7 on o_cons7.id = cons_cust.option7 and o_cons7.sid = 105
left join tblLabelDetail ld_cons7 on ld_cons7.labelID = o_cons7.labelID and ld_cons7.langId = 1 and ld_cons7.eid = 107
left join tbloption o_cons8 on o_cons8.id = cons_cust.option8 and o_cons8.sid = 105
left join tblLabelDetail ld_cons8 on ld_cons8.labelID = o_cons8.labelID and ld_cons8.langId = 1 and ld_cons8.eid = 107
left join tbloption o_cons9 on o_cons9.id = cons_cust.option9 and o_cons9.sid = 105
left join tblLabelDetail ld_cons9 on ld_cons9.labelID = o_cons9.labelID and ld_cons9.langId = 1 and ld_cons9.eid = 107
left join vCustomSession session_cust on session_cust.sessionYM between 601 and 1412 and session_cust.sID=105 and session_cust.ID=session.ID
left join tbloption o_sess1 on o_sess1.id = session_cust.option1 and o_sess1.sid = 105
left join tblLabelDetail ld_sess1 on ld_sess1.labelID = o_sess1.labelID and ld_sess1.langId = 1 and ld_sess1.eid = 107
left join tbloption o_sess2 on o_sess2.id = session_cust.option2 and o_sess2.sid = 105
left join tblLabelDetail ld_sess2 on ld_sess2.labelID = o_sess2.labelID and ld_sess2.langId = 1 and ld_sess2.eid = 107
left join tbloption o_sess3 on o_sess2.id = session_cust.option3 and o_sess3.sid = 105
left join tblLabelDetail ld_sess3 on ld_sess3.labelID = o_sess2.labelID and ld_sess3.langId = 1 and ld_sess3.eid = 107
left join tbloption o_sess4 on o_sess4.id = session_cust.option4 and o_sess4.sid = 105
left join tblLabelDetail ld_sess4 on ld_sess4.labelID = o_sess4.labelID and ld_sess4.langId = 1 and ld_sess4.eid = 107
left join tbloption o_sess5 on o_sess5.id = session_cust.option5 and o_sess5.sid = 105
left join tblLabelDetail ld_sess5 on ld_sess5.labelID = o_sess5.labelID and ld_sess5.langId = 1 and ld_sess5.eid = 107
left join tbloption o_sess6 on o_sess6.id = session_cust.option6 and o_sess6.sid = 105
left join tblLabelDetail ld_sess6 on ld_sess6.labelID = o_sess6.labelID and ld_sess6.langId = 1 and ld_sess6.eid = 107
left join tbloption o_sess7 on o_sess7.id = session_cust.option7 and o_sess7.sid = 105
left join tblLabelDetail ld_sess7 on ld_sess7.labelID = o_sess7.labelID and ld_sess7.langId = 1 and ld_sess7.eid = 107
left join tbloption o_sess8 on o_sess8.id = session_cust.option8 and o_sess8.sid = 105
left join tblLabelDetail ld_sess8 on ld_sess8.labelID = o_sess8.labelID and ld_sess8.langId = 1 and ld_sess8.eid = 107
left join tbloption o_sess9 on o_sess9.id = session_cust.option9 and o_sess9.sid = 105
left join tblLabelDetail ld_sess9 on ld_sess9.labelID = o_sess9.labelID and ld_sess9.langId = 1 and ld_sess9.eid = 107
where session.sID=105 and session.tStamp >= 'Sep 1 2014 12:00AM' and session.tStamp < 'Dec 12 2014 12:00AM'
order by session.tStamp, session.ID
Is there a way , where i can simplify the joins with tbloption and tblLabelDetail and get my o/p in optimal time.
Regards

I have headed towards another approach ie. using unpivot and then pivot.
First i am converting option1-option9 into column , then doing PIVOT to get back the same record . But issue is that when i am doing pivoting i am getting NULL values.
My query is :
select * into #t1 from
select ID
, option1
, option2
, option3
, option4
, option5
, option6
, option7
, option8
, option9
from vCustomConsumer
where sid=105
and sessionYM = 1412
) SourceTable
UNPIVOT
optionID FOR Col IN
(option1
,option2
,option3
,option4
,option5
,option6
,option7
,option8
,option9 )
) AS unpvt
select t.ID,t.optionID,t.col,cast(ld.text as varchar(max)) as text into #t2
from #t1 t
left outer join tbloption o on o.ID = t.optionID
left outer join tblLabelDetail ld on ld.labelID = o.labelID and ld.langID=1
order by ID,col
select ID,option1
,option2
,[option3]
,option4
,option5
,option6
,option7
,option8
,option9
from
select ID,optionID,col,text
from #t2
)up
pivot
min(text)for col in
(option1
,option2
,[option3]
,option4
,option5
,option6
,option7
,option8
,option9
)as pvt
In my last query where i am using pivot, i am getting NULL values. When i check the data in temp table #t2 , it exists perfectly . But when pivoting i dont understand why it is returning most of the NULL values. I am getting data for only one column in single
row.
Below are some rows from result set finally obtained after pivoting :
ID
option1
option2
option3
option4
option5
option6
option7
option8
option9
62949026
NULL
0 to 200 seconds
NULL
NULL
NULL
NULL
NULL
NULL
NULL
62966000
NULL
NULL
4
NULL
NULL
NULL
NULL
NULL
NULL
62966032
NULL
NULL
4
NULL
NULL
NULL
NULL
NULL
NULL
63090372
NULL
NULL
NULL
NULL
EN
NULL
NULL
NULL
NULL
63090375
NULL
NULL
NULL
NULL
EN
NULL
NULL
NULL
NULL
Thanks,

Steps for performance Tuning....!!!!

Hi all,
I need your help in Performance tuning.
While we do tuning in Oracle, apart from Indexes, where clause and order by clause, what are the other points we need to check. I mean explain plan etc...
I am working as Informatica Developer, but i need to make an documents which points out what are the step we can check while doing performance tuning on SQL queries.
Thanks in advance for your help.

Hi,
have a look into these link.it may helpful to you.
When your query takes too long .
When your query takes too long ...
* HOW TO Post a SQL statement tuning request template posting *
HOW TO: Post a SQL statement tuning request - template posting
Edited by: Ravi291283 on Jul 28, 2009 4:00 AM
Edited by: Ravi291283 on Jul 28, 2009 4:01 AM
Edited by: Ravi291283 on Jul 28, 2009 4:02 AM

Performance tuning in PL/SQL code

Hi,
I am working on already existing PL/SQL code which is written by someone else on validation and conversion of data from a temporary table to base table. It usually has 3.5 million rows. and the procedure takes arount 2.5 - 3 hrs to complete.
Can I enhance the PL/SQL code for better performance ? or, is this OK to take so long to process these many rows?
Thanks!
Yogini

Can I enhance the PL/SQL code for better performance ? Probably you can enhance it.
or, is this OK to take so long to process these many rows? It should take a few minutes, not several hours.
But please provide some more details like your database version etc.
I suggest to TRACE the session that executes the PL/SQL code, with WAIT events, so you'll see where and on what time is spent, you'll identify your 'problem statements very quickly' (after you or your DBA have TKPROF'ed the trace file).
SQL> alter session set events '10046 trace name context forever, level 12';
SQL> execute your PL/SQL code here
SQL> exitWill give you a .trc file in your udump directory on the server.
http://www.oracle-base.com/articles/10g/SQLTrace10046TrcsessAndTkprof10g.php
Also this informative thread can give you more ideas:
HOW TO: Post a SQL statement tuning request - template posting
as well as doing a search on 10046 at AskTom, http://asktom.oracle.com will give you more examples.
and reading Oracle's Performance Tuning Guide: http://www.oracle.com/pls/db102/to_toc?pathname=server.102%2Fb14211%2Ftoc.htm&remark=portal+%28Getting+Started%29

Performance Tuning on PL/sql

Dear all,
I am not sure whether I am right to post this enquiry here, please correct me if I am wrong.
I have a sql stmt that run for a long time and caused a error of 'out of temp sapce' in oracle server. How can I tune my sql for better performance using command 'EXPLAIN PLAN'? How could I know the details information for those columns in the table 'PLAN_TABLE'?
Best Regards,
Marius

Read the "Database Performance Tuning Guide and Reference" for your version of Oracle (available online, right here).
Richard

SQL Performance tuning with wildcard Like condition

Hi,
I have performance issue with SQL query.
When I am using "where emp_name like '%im%' " query is taking longer time than when I use "where emp_name like 'im%' " .
With former condition query takes 40 sec , with later it takes around 1.5 sec.
Both returns almost same no. of rows. We have function based index created on emp_name column.
With wildcard at both ends query goes for full table scan.
Can any one please suggest way so that query responce time can be reduced.?
I even tried using hints but still it is going for full table scan instead of using index.

>
Hi Mandark,
<I've rearranged your post>
When I am using "where emp_name like '%im%' " query is taking longer time than when I use "where emp_name like 'im%' " .
With wildcard at both ends query goes for full table scan.
I even tried using hints but still it is going for full table scan instead of using index.
With former condition query takes 40 sec , with later it takes around 1.5 sec.
Both returns almost same no. of rows. We have function based index created on emp_name column.You are never going to be able to speed things up with a double wild card - or even 1 wild card at the beginning
(unless you have some weird index reversing the string).
With the double wild-card, the system has to search through the string character by character to see
if there are any letter "i's" and then see if that letter is followed by an "m".
That's using your standard B-tree index (see below).
Can any one please suggest way so that query responce time can be reduced.?Yes, I think so - there is full-text indexing - see here:
http://www.dba-oracle.com/oracle_tips_like_sql_index.htm and
http://www.oracle-base.com/articles/9i/full-text-indexing-using-oracle-text-9i.php
AFAIK, it's an extra-cost option - but you can have fun finding out all that for yourself ;)
HTH,
Paul...

[ADF-11.1.2] Proof of view performance tuning in oracle adf

Hello,
Take an example of : http://www.gebs.ro/blog/oracle/adf-view-object-performance-tuning-analysis/
It tells me perfectly how to tune VO to achieve performance, but how to see it working ?
For example: I Set Fetch size of 25, 'in Batch of' set to 1 or 26 I see following SQL Statement in Log
[1028] SELECT Company.COMPANY_ID, Company.CREATED_DATE, Company.CREATED_BY, Company.LAST_MODIFY_DATE, Company.LAST_MODIFY_BY, Company.NAME FROM COMPANY Companyas if it is fetching all the records from table at a time no matter what's the size of Batch. If I am seeing 50 records on UI at a time, then I would expect at least 2 SELECT statement fetching 26 records by each statement if I set Batch Size to 26... OR at least 50 SELECT statement for Batch size set to '1'.
Please tell me how to see view performance tuning working ? How one can say that setting batch size = '1' is bad for performance?

Anandsagar,
why don't you just read up on http://download.oracle.com/docs/cd/E21764_01/core.1111/e10108/adf.htm#CIHHGADG
there are more factors influencing performance than just query. Btw, indexing your queries also helps to tune performance
Frank

No one wants my Performance Tuning experience?

I worked as a DBA for 2 years in IT major where my work was confined to Performance Tuning & monitoring
and so I had no opportunity to get the experience of Backup & Recovery,RMAN and other Core DBA responsibilities.
I had to leave in July last year due to my some other career interest. Unfortunately that didn't get
fulfilled.
So from January 15th I have decided to resume my career as a DBA.
I went to a 3 interviews ,but every time my lack of experience in Backup & Recovery and other Core DBA responsibilities is not making my case stronger in the interviews.
I am losing confidence over my chances of getting a job. Most(Almost 95%) of the IT companies want minimum 3 years experience and that too with Backup & Recovery.
I have not yet done OCA (I passed only 1z0 042). So i am planning to give 1z0-007 so that i become OCA.
My questions to all?
1.*How much value OCA hold in the market* along with 2 years experience(In India i am based,more specifically Pune)
2. How should i get the practical experience of Backup & Recovery at home itself?+_
3. I dont have the financial power to go for TRAINING part of the OCP, so how should i make my resume look strong?
4. Doesn't any company want a DBA who hasn't had a experience in Backup & Recovery. Is Performance Tuning & Monitoring experience such a waste?
Cheers,
Kunwar

user12591638 wrote:
I worked as a DBA for 2 years in IT major where my work was confined to Performance Tuning & monitoring
and so I had no opportunity to get the experience of Backup & Recovery,RMAN and other Core DBA responsibilities.
I had to leave in July last year due to my some other career interest. Unfortunately that didn't get
fulfilled.
So from January 15th I have decided to resume my career as a DBA.
I went to a 3 interviews ,but every time my lack of experience in Backup & Recovery and other Core DBA responsibilities is not making my case stronger in the interviews.
I am losing confidence over my chances of getting a job. Most(Almost 95%) of the IT companies want minimum 3 years experience and that too with Backup & Recovery.
I have not yet done OCA (I passed only 1z0 042). So i am planning to give 1z0-007 so that i become OCA.
OK. India has produced a lot of DBA's over the past few years, so I suspect the supply/demand situation is not in your favour, especially with the global economic climate.
And because of career break employers will often have other candidates who look stronger. And they will have certifications.
So you've been looking a month and got 3 interviews .... that's actually not that bad.
My questions to all?
1.*How much value OCA hold in the market* along with 2 years experience(In India i am based,more specifically Pune)In general not a lot. However the only thing stopping you gettig an 10g DBA OCA is an SQL exam pass. Now if you can't pass that exam then you don't deserve the job. And given you've passed 1z0-042 an employer wll ask why who haven't passed the SQL exam (especially if you're into tuing and performance). People in India seem to love 1z0-007 .... I prefer to see people who have taken 1z0-051 or 1z0-047. However I suspect you cannot afford to spend the extra time on 1z0-047 as you need to concentrate on backup/recovery.
2. How should i get the practical experience of Backup & Recovery at home itself?+_Hopefully you've got kit to practice on.
3. I dont have the financial power to go for TRAINING part of the OCP, so how should i make my resume look strong?Resume's are not my best area. However in your case studying and passing 1z0-043 will help. 1z0-043 is 50% backup and recovery so that has synergy with your weak area. If finance is an issue consider a WDP course if you can get one. Some eligible courses are cheaper than others, but even they may be beyond reach,
4. Doesn't any company want a DBA who hasn't had a experience in Backup & Recovery. Is Performance Tuning & Monitoring experience such a waste?
Obviously performance tuning and monitoring is not a waste ..... but remember Oracle is increasingly attemting to automate these in later vesions, and different techniques are available in 11gR2 compared to 9i.
Cheers,
KunwarYou might find: RMAN Recipes for Oracle Database 11g : A Problem-Solution Approach ... ISBN13: 978-1-59059-851-1 ... a little useful.
Rgds bigdelboy. (I've been composing this over a 2 hour period with several distractions and have run out of time so some bits might not make sense ... i may even have siad something silly).

Performance tuning in t

hi,
I have to do perofrmance for one program, it is taking 67000 secs in back ground for execution and 1000 secs for some varints .It is an ALV report.
please suggest me how to proced to change the code.

Performance tuning for Data Selection Statement
<b>http://www.sap-img.com/abap/performance-tuning-for-data-selection-statement.htm</b>Debugger
http://help.sap.com/saphelp_47x200/helpdata/en/c6/617ca9e68c11d2b2ab080009b43351/content.htm
http://www.cba.nau.edu/haney-j/CIS497/Assignments/Debugging.doc
http://help.sap.com/saphelp_erp2005/helpdata/en/b3/d322540c3beb4ba53795784eebb680/frameset.htm
Run Time Analyser
http://help.sap.com/saphelp_47x200/helpdata/en/c6/617cafe68c11d2b2ab080009b43351/content.htm
SQL trace
http://help.sap.com/saphelp_47x200/helpdata/en/d1/801f7c454211d189710000e8322d00/content.htm
CATT - Computer Aided Testing Too
http://help.sap.com/saphelp_47x200/helpdata/en/b3/410b37233f7c6fe10000009b38f936/frameset.htm
Test Workbench
http://help.sap.com/saphelp_47x200/helpdata/en/a8/157235d0fa8742e10000009b38f889/frameset.htm
Coverage Analyser
http://help.sap.com/saphelp_47x200/helpdata/en/c7/af9a79061a11d4b3d4080009b43351/content.htm
Runtime Monitor
http://help.sap.com/saphelp_47x200/helpdata/en/b5/fa121cc15911d5993d00508b6b8b11/content.htm
Memory Inspector
http://help.sap.com/saphelp_47x200/helpdata/en/a2/e5fc84cc87964cb2c29f584152d74e/content.htm
ECATT - Extended Computer Aided testing tool.
http://help.sap.com/saphelp_47x200/helpdata/en/20/e81c3b84e65e7be10000000a11402f/frameset.htm
Just refer to these links...
performance
Performance
Performance Guide
performance issues...
Performance Tuning
Performance issues
performance tuning
performance tuning
You can go to the transaction SE30 to have the runtime analysis of your program.Also try the transaction SCI , which is SAP Code Inspector.

Performance Tuning in IR

Hello All,
We have created some reports using Interactive Reporting Studio. The volume of data in that Oracle database are huge and in some tables of the relational database are having above 3-4 crores rows individually. We have created the .oce connection file using the 'Oracle Net' option. Oracle client ver is 10g. We earlier created pivot, chart and report in those .bqy files but had to delete those where-ever possible to decrease the processing time for getting those report generated.
But deleting those from the file and retaining just the result section (the bare minimum part of the file) even not yet helped us out solving the performance issue fully. Still now, in some reports, system gives error message 'Out of Memory' at the time of processing those reports. The memory of the client PCs,wherefrom the reports are being generated are 1 - 1.5 GB. For some reports, even it takes 1-2 hours for saving the results after process. In some cases, the PCs gets hanged at the time of processing. When we extract the query of those reports in sql and run them in TOAD/SQL PLUS, they take not so much time like IR.
Would you please help us out in the aforesaid issue ASAP? Please share your views/tips/suggestions etc in respect of performance tuning for IR. All reply would be highly appreciated.
Regards,
Raj

SQL + & Toad are tools that send SQL and spool results; IR is a tool that sends a request to the database to run SQL and then fiddles with the results before the user is even told data has been received. You need to minimize the time spent by IR manipulating results into objects the user isn't even asking for.
When a request is made to the database, Hyperion will wait until all of the results have been received. Once ALL of the results have been received, then IR will make multiple passes to apply sorts, filters and computed items existing in the results section. For some unknown reason, those three steps are performed more inefficiently then they would be performed in a table section. Only after all of the computed items have been calculated, all filters applied and all sorts sorted, then IR will start to calculate any reports, charts and pivots. After all that is done, the report stops processing and the data has been "returned"
To increase performance, you need to fine tune your IR Services and your BQY docs. Replicate your DAS on your server - it can only transfer 2g before it dies, restarts and your requested document hangs. You can replicated the DAS multiple times and should do so to make sure there are enough resources available for any concurrent users to make necessary requests and have data delivered to them.
To tune your bqy documents...
1) Your Results section MUST be free of any sorts, filters, or computed items. Create a staging table and put any sorts or local filters there. Move as many of your computed items to your database request line and ask the database to make the calculation (either directly or through stored procedures) so you are not at the mercy of the client machine. Any computed items that cannot be moved to the request line, need to be put on your new staging table.
2) Ask the users to choose filters. Programmatically build dynamic filters based on what the user is looking for. The goal is to cast a net only as big as the user needs so you are not bringing back unnecessary data. Otherwise, you will bring your server and client machines to a grinding halt.
3) Halt any report pagination. Built your reports from their own tables and put a dummy filter on the table that forces 0 rows in the table until the report is invoked. Hyperion will paginate every report BEFORE it even tells the user it has results so this will prevent the user from waiting an hour while 1000s of pages are paginated across multiple reports
4) Halt any object rendering until request. Same as above - create a system programmically for the user to tell the bqy what they want so they are not waiting forever for a pivot and 2 reports to compile and paginate when they want just a chart.
5) Saved compressed documents
6) Unless this document can be run as a job, there should be NO results stored with the document but if you do save results with the document, store the calculations too so you at least don't have to wait for them to pass again.
7) Remove all duplicate images and keep the image file size small.
Hope this helps!
PS: I forgot to mention - aside from results sections, in documents where the results are NOT saved, additional table sections take up very, very, very small bits of file size and, as long as there are not excessively larger images the same is true for Reports, Pivots and Charts. Additionally, the impact of file size only matters when the user is requesting the document. The file size is never an issue when the user is processing the report because it has already been delivered to them and cached (in workspace and in the web client)
Edited by: user10899957 on Feb 10, 2009 6:07 AM

Regarding performance tuning

hi,
i have developed a report program.its taking too much time to fetch the records.so what steps i have to consider to improve the performance. urgent plz.

Hi,
Check this links
Performance tuning for Data Selection Statement & Others
http://www.sap-img.com/abap/performance-tuning-for-data-selection-statement.htm
http://www.sapdevelopment.co.uk/perform/performhome.htm
http://www.thespot4sap.com/Articles/SAPABAPPerformanceTuning_PerformanceAnalysisTools.asp
http://www.thespot4sap.com/Articles/SAPABAPPerformanceTuning_Introduction.asp
1. Debugger
http://help.sap.com/saphelp_47x200/helpdata/en/c6/617ca9e68c11d2b2ab080009b43351/content.htm
http://www.cba.nau.edu/haney-j/CIS497/Assignments/Debugging.doc
http://help.sap.com/saphelp_erp2005/helpdata/en/b3/d322540c3beb4ba53795784eebb680/frameset.htm
2. Run Time Analyser
http://help.sap.com/saphelp_47x200/helpdata/en/c6/617cafe68c11d2b2ab080009b43351/content.htm
3. SQL trace
http://help.sap.com/saphelp_47x200/helpdata/en/d1/801f7c454211d189710000e8322d00/content.htm
6. Coverage Analyser
http://help.sap.com/saphelp_47x200/helpdata/en/c7/af9a79061a11d4b3d4080009b43351/content.htm
7. Runtime Monitor
http://help.sap.com/saphelp_47x200/helpdata/en/b5/fa121cc15911d5993d00508b6b8b11/content.htm
8. Memory Inspector
http://help.sap.com/saphelp_47x200/helpdata/en/a2/e5fc84cc87964cb2c29f584152d74e/content.htm
http://sap.genieholdings.com/abap/performance.htm
http://www.dbis.ethz.ch/research/publications/19.pdf
Reward Points if it is Useful.
Thanks,
Manjunath MS

Oracle Application Performance Tuning

Hello all,
Please forgive me if I am asking this in the wrong section.
I am a s/w engineer with 2 years of exp. I have been working as a performance tuning resource for Oracle EBS in my company. The work mostly involved SQL tuning and dealing with indexes etc. In this time I took up interest in DBA stuff and I completed my OCA in Oracle 10g. Now my comany is giving me an oppurtunity to move into an Application DBA team and I am totally confused about it.
Becoming an Apps DBA will mean that the effort I put into the certification in 10g will be of no use. There are other papers for Apps DBA certification. Should I stay put in performance tuning & wait for a Core DBA chance or shall I accept the Apps DBA oppurtunity.
Also, does my exp. in SQL performace tuning hold any value as such with out an exposure to DBA activities?
Kindly guide me in this regards as I am very confused at this juncture.
Regards,
Jithin

Jithin wrote:
Hello bigdelboy , Thank you for your reply.
Yes, By oracle Apps DBA I meant Oracle EBS.
Clearing 1Z0-046 is an option. However, my doubt is will clearing both the exams Admin I and Admin II be of any help without having practical expericnce? The EBS DBA work involves support and patching, cloning, and new node setup etc.
Also, is my performance tuning experience going to help me in any way in the journey forward as a DBA/ EBS DBA?
Thank you for your valuable time.
Regards,
Jithin SarathThe way I read it is this.
People notice you are capable of understanding and performance tuning SQL. And you must have some knowledge of Oracle EBS. And in fact you also have a DBA OCA.
So there is a 98% + chance you can be made into a good Oracle Apps DBA (and core DBA). If I was in their position I'd want you on my team too; this is the way we used to bring on DBA's in the old days before certification and it has a lot of merit still. Okay you can only do limited tasks at first ... but the number of taks you can do will increase dramatically over a number of months.
I would imagine the Oracle Apps DBA will be delighted to have someone on board who can performance tune SQL which sometimes can sometimes seem more like an art than a science. The patching etc can be taught in small doses. If they are a good team they wont try to give you everything at once, they'll get you to learn one procedure at a time.
And remember, if in doubt ask; and if you dont understand ask again. And be safe rather than sorry on actions that could be critial.
If your worried about liinux: Linux Recipes For Oracle Dbas (Apress) might be a good book to read but could be expensive in India
Likewise: (Oracle Applications Dba Field Guide) may suit and even (Rman Recipes For Oracle Database 11 G: A Problem-solution Approach) may have some value if you need to get up to speed quickly in those areas.
These are not perfect but they sometimes consolidate the information neatly; however only buy if you feel they are cheap enough. You may well buy them and feel disappointed (These all happen to be by Apress who seem to have produced a number of good books ... they've also published some rubbish as well)
And go over the 2-day dba examples as well and linux install examples n OTN as well ... they are free compared to the books I mentioned.
Rgds -bigdelboy.

Performance tuning - bad sql

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