Query cost is low but the time taken is high

Hi,
I have tuned the queries which now are costing the CPU low. But the time taken is still higher (of order of 999,999,999.0)
What is scope of improvement ?
Regards,
Chitwanjit

Moderator message - Please ask a specific question - post locked
Rob

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Less sql query cost ... but more time to fetch the records...

Hi,
I faced up to a 'peculiar' situation with a costly db view.
I attempted to reduce the total view cost
specifically for 223 records fetched{the cost from 149 reduced to 74,
                                                       the recursive calls from 796 reduced to 224,
                                                       the consistent gets from 311516 reduced to 310341,
                                                        the physical reads from 7 reduced to 0}
but the amount of time needed to fetch the results is greater than the old version of the db view....{it may be the double...}
Have you any idea about this...????
Note: I have got fresh statistics...
         I use db 10g v.2
Thanks,
Sim

Try tracing the query and see what tkprofs shows you.
alter session set events '10046 trace name context forever, level 12';
run the query
alter session set events '10046 trace name context off';
Then run tkprofs on the trace file produced to see where the database is spending its time/effort. Do likewise for the baseline query in a different session (so you will generate a different trace file).
If that does not produce anything useful, try using
alter session set events '10053 trace name context forever';
run the query
alter session set events '10053 trace name context off';
Then examine the trace file to see if you can learn anything.
Since you have not given us anything more to go on, that is about all the help I can give....

Need the query to calculate the time taken to excute it.

hi all,
i need the query to calculate the time taken to excute it.
for ex:
select * from emp;
how much time it will take to give o/p
Thanks in advance
satya

Just to add to what was said - the execution can each time be DIFFERENT as the factors that governs performance are NOT CONSTANT.
If Oracle has no idea how long the query is going to take before executing it, then how can you and your code know?
Oracle's CBO estimates the cost (expense) of the query. This is an indication of how expensive a query is - and the more expensive the query, the more resources need to be used, the longer the query will take. The less expensive the query, the fewer resources it need, the faster it will take.
And that is it. How fast or how slow? Oracle does not know. How much faster a query with a cost of 10,000 versus a query with a cost of 1? Oracle does not know.
Why? Because the platform is not constant. Just what data is at this exact moment in the db buffer cache? Just how much CPU capacity is available for the new few seconds? Just what will the sustained throughput be of the I/O subsystem and channels for the next minute? Just how many memory pages need to be swapped between cache and memory? Etc. etc.
All these factors change every single second. So forget about attempting to accurately calculate up-front the time it will take for a query. IT IS NOT POSSIBLE.

How to analyse the time taken for a query

Hey gurus ,
How to find the time taken for a query to execute .
Regards,
Venkatesh

Hi,
Time taken to execute a query = FRONT END TIME + OLAP TIME + DB TIME.
front end time is time taken to do format in BEX.
olap time is time taken to aggegate data in OLAP buffer.
db time is tme taken to collect data at data target.
to fine all these information
goto RSRT -> give query name -> execute+debug -> it will display all the fields > check fields what ever u want.
Regards,
Haritha.

How to find the time taken for creating execution plan alone

Hi,
Is there any way to find out the division between the time taken for query parsing, creating execution plan and actual data retrieval seperately? If I enable 'set timing on' I see the elapsed time which is the total time taken for all these 3.
Some of my queries are taking long time when I run it first time and so want to know what is it taking long, is it the parsing the query or creating the execution plan? (Since my queries run faster second time, I am assuming the major part was for parsing or creating the plan but not the data retrieval).
Also, where does Oracle keep the execution plan? Is it in the BUFFER_CACHE? if so, I tried flushing the buffer_cache and restarting the DB as well, but still the query execution seems faster compared to the first time. How long does Oracle keep the execution plan in the cache and is there anyway to increase this cache size?
Thanks in advance!

user13169027 wrote:
Hi,
Is there any way to find out the division between the time taken for query parsing, creating execution plan and actual data retrieval seperately? If I enable 'set timing on' I see the elapsed time which is the total time taken for all these 3.
Some of my queries are taking long time when I run it first time and so want to know what is it taking long, is it the parsing the query or creating the execution plan? (Since my queries run faster second time, I am assuming the major part was for parsing or creating the plan but not the data retrieval).
The ideal way for finding the answer to your questions above, would be to perform a (sql) trace of your query executions. To see the difference in the trace-files, you might want to trace the first execution in one session, and the second execution in another session: so you get two different trace files, which you can then seperately tkprof, and investigate.
Also, where does Oracle keep the execution plan? Is it in the BUFFER_CACHE? if so, I tried flushing the buffer_cache and restarting the DB as well, but still the query execution seems faster compared to the first time. How long does Oracle keep the execution plan in the cache and is there anyway to increase this cache size?
Execution plans are held in the shared-pool, not the buffer-cache. As far as I know they will be kept in memory in an LRU way (least recently used), just like db-blocks are in the buffer-pool (I know this is not entirely correct, but for all practical purposes, think of it this way).

PO Lead Time cannot capture the time taken for shipping!

Dear All
I understand that we have PO lead time = PO Processing Time (Working Day) + Planned Delivery Time (Calendar Day) + GR processing time (working day).
And this PO lead time will be added on top of my PO Creation Date to defer the actual goods availability date.
My question:
1. Planned delivery time is the time taken from vendor place to send out the goods to my warehouse. What if it is overseas purchase where goods leaving vendor's Port will first arrive in my country custom, and it will take 3 days to do clearance. once it is cleared, forwarding agent will delivery goods from my country custom to my warehouse. In this case, how do I capture it in SAP system for the planned delivery time as it has 4 periods of time now
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b. Time taken for my country custom to do clearing
c. Time taken for forwarding agent to fetch goods from custom to my warehouse
d. Time taken for unpack, take out , count, inspect and put for use (GR processing time)
Do I need to use user Exit?
Thanks
Edited by: Daimos on Apr 27, 2009 6:52 PM

Dear dogboy.
I think we must use feature on the PO Confirmation Control (CC) Key at PO Item Level:
ED - Estimated Time of Departure from Overseas Port.
EA - Actual Time of Departure from Overseas Port.
EA - Estimated Time of Arrival
AA - Actual Time of Arrival
And the purchaser will maintain the value of each of the CC Key each time they are notified by the vendor.
And we need to come out with a Customised Report to capture those CC dates entered so that finance is able to prepare $ in advance if the moment the EA is maintained, meaning the estimated date of arrival at the Custom there.
But the problem is that PO User Exit is only at the header of Confirmation Control Key but not capture the DATE field we entered for each CC.
That was the problem I last encountered.

OWB 10g - The time taken for data load is too high

I am loading data on the test datawarehouse server. The time taken for loading data is very high. The size of data is around 7 GB (size of flat files on the OS).
The time it takes to load the same amount of data on the production server from the staging area to the presentation area(datawarehouse) is close to 8 hours maximum.
But, in the test environment the time taken to execute one mapping (containing 300,000 records)is itself 8 hours.
The version of Oracle database on both the test and production servers is the same i.e., Oracle 9i.
The configuration of the production server is : 4 Pentium III processors (2.7 GHz each), 2 GB RAM, Windows 2000 Advanced Server, 8 kilobyte primary memory cache, 512 kilobyte secondary memory cache, 440.05 Gigabytes Usable Hard Drive Capacity, 73.06 Gigabytes Hard Drive Free Space
The configuration of the test server is : 4 Pentium III processors (2.4 GHz each), 1 GB RAM, Windows 2000 Advanced Server, 8 kilobyte primary memory cache,
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PwC

Hello Harshad,
2 GB of RAM doesn't seem to be very much to me. I guess your bottleneck is I/O. You've got to investigate this (keep an eye on long running processes). You didn't say very much about your target database design. Do you have a lot of indexes on the target tables and if so have you tried to drop them before loading? Do your OWB mappings require a lot of lookups (then apropriate indexes on the lookup table are very useful)? Do you use external tables? Are you talking about loading dimension or fact tables or both? You've got to supply some more information so that we can help you better.
Regards,
Jörg

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http://pondini.org/TM/Troubleshooting.html

I delete an individual message but the time I received the message is still showing next to the persons name in my inbox instead of going back into the correct date/time order. Anyone know how to fix this?

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SOLUTION
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Using FaceTime http://support.apple.com/kb/ht4319
Troubleshooting FaceTime http://support.apple.com/kb/TS3367
The Complete Guide to FaceTime + iMessage: Setup, Use, and Troubleshooting
http://tinyurl.com/a7odey8
Troubleshooting FaceTime and iMessage activation
http://support.apple.com/kb/TS4268
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http://support.apple.com/kb/HT3529
Set up iMessage
http://www.apple.com/ca/ios/messages/
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http://osxdaily.com/2011/10/18/set-up-imessage-on-iphone-ipad-ipod-touch-with-io s-5/
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My Facetime Doesn't Ring
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Query cost is low but the time taken is high

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