Can View improve Performance?

Hi,
For improving performance, i have created a view in rpd so that my fact table row count comparing with base fact table reduce from 117888 records to 3263 records. And I am using this view as a fact table and joined with other dimension tables. But I am wondering by doing this will be there be any better performance?
Thanks,
Phani.

Hi,
I dont think view will help in performance instead go for materialized views.
Check this.....http://www.biblogs.com/2008/11/28/thoughts-on-obiee-performance-optimization-diagnostics/
Need help on OBIEE performance
Regards,
Srikanth

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How can I improve performance for BC4J/JSP-application

Hi,
I have developed a JSP-Applikcation with the master-detail views. This Application has been implemented
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======================== master.jsp =================================
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How can we improve performance while selection production orders from resb

Dear all,
there is a performance issue in a report which compares sales order and production order.
Below is the code, in this while reading production order data from resb with the below select statement.
can any body tell me how can we improve the performance? should we use indexing, if yes how to use indexing.
*read sales order data
SELECT vbeln posnr arktx zz_cl zz_qty
INTO (itab-vbeln, itab-sposnr, itab-arktx, itab-zz_cl, itab-zz_qty)
FROM vbap
WHERE vbeln = p_vbeln
AND   uepos = p_posnr.
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**read production order data*
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Himanshu,
Put a break point before these two select statements and execute in the production.This way you will come to know which select statement is taking much time to get executed.
In both the select statements the where clause is not having the primary keys.
Coming to the point of selecting the data from vbap do check the SAP note no:-185530 accordigly modify the select statement.
As far as the table RESB is concerened here also the where clause doesn't have the primary keys.Do check the SAP Note No:-187906.
I guess not using primary keys is maring the performance.
K.Kiran.

Join taking lot of time.? How can we improve performance?

Hi,
I am having tow sources SRC_A and SRC_B.
I am applying full outer join between the 2 sources.
Here SRC_A contains 2 fields. It contains 8 Crore records.
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I am having temp table space is of 500 GB. and Undo Table space is of 250GB.
I am getting Roll back segment error.
It didn't insert a single recornd in the target table.
Could anyone please suggest me?
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Regards,
Gowtham Sen.

you need to provide your oracle version, ora-xxxxx error code, formatted([ pre ] tags) source code and explain plan output at least to get more help here.
alter session set statistics_level = all ;
explain plan set statement_id = 'demo' into plan_table for SELECT ..
SELECT PLAN_TABLE_OUTPUT FROM TABLE(dbms_xplan.display_cursor(null, null, 'allstats last'));here are some examples.
http://psoug.org/reference/explain_plan.html
http://coskan.wordpress.com/2007/03/04/viewing-explain-plan/
Also autotrace option or sql trace+tkprof will provide the informations needed.
http://www.bhatipoglu.com/entry/17/oracle-performance-analysis-tracing-and-performance-evaluation
If this is a snapshot too old error please mention undo management settings.

How can I improve performance over a Branch Office IPsec vpn tunnel between and SA540 and an SA520

Hello,
I just deployed one Cisco SA540 and three SA520s.
The SA540 is at the Main Site.
The three SA520s are the the spoke sites.
Main Site:
Downstream Speed: 32 Mbps
Upstream Speed: 9.4 Mbps
Spoke Site#1:
Downstream Speed: 3.6 Mbps
Upstream Speed: 7.2 Mbps (yes, the US is faster than the DS at the time the speed test was taken).
The SA tunnels are "Established"
I see packets being tranmsitted and received.
Pinging across the tunnel has an average speed of 32 ms (which is good).
DNS resolves names to ip addresses flawlessly and quickly across the Inter-network.
But it takes from 10 to 15 minutes to log on to the domain from the Spoke Site#1 to the Main Site across the vpn tunnel.
It takes about 15 minutes to print across the vpn tunnel.
The remedy this, we have implemented Terminal Services across the Internet.
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I have used ASAs before in other implementation without any issues at all.
I am wondering if I replaced the SAs with ASAs, that they may fix my problem.
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I just know that my experience with the Cisco TAC has been great for the last 10 years.
My short experience with the Cisco Small Business Support Center has not been as great at all.
Bottom Line:
I am going to open another case with the Day Shift tomorrow and see if they can find a way to speed things up.
Now this is not just happening between the Main Site and Spoke Site #1 above. It is also happeninng between the Main Site and Spoke #2 (I think Spoke#2 has a Download Speed of about 3Mbps and and Upload Speed of about 0.5 Mbps.
Please help.
I would hate to dismiss SA5xx series without making sure it is not just a simple configuration setting.

Hi Anthony,
I agree!. My partner wants to just replace the SA5xxs with ASAs, as we have never had problems with ASA vpn performance.
But I want to know WHY this is happening too.
I will definitely run a sniffer trace to see what is happening.
Here are some other things I have learned from the Cisco Small Business Support Center (except for Item 1 which I learned from you!)
1. Upgrade the SA540 at the Main Site to 2.1.45.
2a. For cable connections, use the standard MTU of 1500 bytes.
2.b For DSL, use the following command to determine the largets MTU that will be sent without packet fragmentation:
ping -f -l packetsize
Perform the items below to see if this increases performance:
I was told by the Cisco Small Business Support Center that setting up a Manual Policy is not recommended; I am not sure why they stated this.
3a. Lower the IKE encryption algorithm from "AES-128" to DES.
3b. Lower the IKE authentication algorithm to MD5
3c. Also do the above for the VPN Policy
Any input is welcome!

How can I improve performance of macbook air

My MacBook Air seems ti be running slow: Slow to start up, slow to start new programs, slow when running multiple tasks at the same time.
Here's how my machine is set up:
Processor 1.86 GHz Intel Core 2 Duo
Memory 2 GB 1067 MHz DDR3
OSX 10.8.2
Any suggestions or is this what i can expect?
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Things You Can Do To Resolve Slow Downs
If your computer seems to be running slower here are some things you can do:
Start with a visit to: OS X Maintenance - MacAttorney.
Boot into Safe Mode then repair your hard drive and permissions:
Repair the Hard Drive and Permissions Pre-Lion
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
Repair the Hard Drive - Lion
Boot from your Lion Recovery HD. When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Restart your computer normally and see if this has helped any. Next do some maintenance:
Suggestions for OS X Maintenance
For situations Disk Utility cannot handle the best third-party utility is Disk Warrior; DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption; Disk Warrior 4.x is now Intel Mac compatible.
OS X performs certain maintenance functions that are scheduled to occur on a daily, weekly, or monthly period. The maintenance scripts run in the early AM only if the computer is turned on 24/7 (no sleep.) If this isn't the case, then an excellent solution is to download and install a shareware utility such as Macaroni, JAW PseudoAnacron, or Anacron that will automate the maintenance activity regardless of whether the computer is turned off or asleep. Dependence upon third-party utilities to run the periodic maintenance scripts was significantly reduced since Tiger. These utilities have limited or no functionality with Snow Leopard or Lion and should not be installed.
OS X automatically defragments files less than 20 MBs in size, so unless you have a disk full of very large files there's little need for defragmenting the hard drive. As for virus protection there are few if any such animals affecting OS X. You can protect the computer easily using the freeware Open Source virus protection software ClamXAV. Personally I would avoid most commercial anti-virus software because of their potential for causing problems. For more about malware see Macintosh Virus Guide.
I would also recommend downloading a utility such as TinkerTool System, OnyX 2.4.3, or Cocktail 5.1.1 that you can use for periodic maintenance such as removing old log files and archives, clearing caches, etc.
For emergency repairs install the freeware utility Applejack. If you cannot start up in OS X, you may be able to start in single-user mode from which you can run Applejack to do a whole set of repair and maintenance routines from the command line. Note that AppleJack 1.5 is required for Leopard. AppleJack 1.6 is compatible with Snow Leopard. There is no confirmation that this version also works with Lion.
When you install any new system software or updates be sure to repair the hard drive and permissions beforehand.
Get an external Firewire drive at least equal in size to the internal hard drive and make (and maintain) a bootable clone/backup. You can make a bootable clone using the Restore option of Disk Utility. You can also make and maintain clones with good backup software. My personal recommendations are (order is not significant):
1. Carbon Copy Cloner
2. Data Backup
3. Deja Vu
4. SuperDuper!
5. SyncTwoFolders
6. Synk Pro
7. Synk Standard
8. Tri-Backup
Visit The XLab FAQs and read the FAQs on maintenance, optimization, virus protection, and backup and restore.
Additional suggestions will be found in Mac maintenance Quick Assist.
Referenced software can be found at CNet Downloads or MacUpdate.
Additional Hints
Be sure you have an adequate amount of RAM installed for the number of applications you run concurrently. Be sure you leave a minimum of 10% of the hard drive's capacity as free space.
Add more RAM. If your computer has less than 2 GBs of RAM and you are using OS X Leopard or later, then you can do with more RAM. Snow Leopard and Lion work much better with 4 GBs of RAM than their system minimums. The more concurrent applications you tend to use the more RAM you should have.
Always maintain at least 15 GBs or 10% of your hard drive's capacity as free space, whichever is greater. OS X is frequently accessing your hard drive, so providing adequate free space will keep things from slowing down.
Check for applications that may be hogging the CPU:
Open Activity Monitor in the Utilities folder. Select All Processes from the Processes dropdown menu. Click twice on the CPU% column header to display in descending order. If you find a process using a large amount of CPU time, then select the process and click on the Quit icon in the toolbar. Click on the Force Quit button to kill the process. See if that helps. Be sure to note the name of the runaway process so you can track down the cause of the problem.
Often this problem occurs because of a corrupted cache or preferences file or an attempt to write to a corrupted log file.

Can I improve performance by compiling and running programs?

I installed Arch Linux two weeks. It was not a simple installation like Ubuntu. But now I have a tailored OS and a better understanding of how it works. I hope one day I can switch my primary OS to Arch Linux. I know that Arch Linux is optimized for i686 processors; I wanted to take this idea to more recent processors.
I have a Core 2Duo processor. If I download the source code (of frequently used programs like Firefox) compile it on my computer and use the program will I get a better performance than downloading the binaries? I'm assuming that I can easily find a compiler that leverages the power of more recent processors.
If the answer if yes, please provide me some references to compilers and documentation.

You can compile your own packages with PKGBUILDs, makepkg and ABS,
See these links for further reference:
http://wiki.archlinux.org/index.php/PKGBUILD
http://wiki.archlinux.org/index.php/ABS … ild_System
When you say compiler I take it you mean compile flags specific for your processor?
Look here: http://wiki.archlinux.org/index.php/Safe_Cflags
You probably won't feel any significant speed increase, though.
Edit: The reason to use these tools instead of the traditional way is that the packages created with these tools can be managed by pacman.
Last edited by Ashren (2008-05-07 00:38:05)

Utl_raw.bit_and - how can I improve performance of this query?

Hi all
Hugely grateful for any light anyone can shed.
I need to do bit AND operations on 128 bit numbers and I'm stuck in Oracle 10g.
10g provides a very nice bitand() function that can be applied to numbers but it only works up to 64 bit numbers (actually only 62 I think because it needs a couple of bits)
So I've been looking at using the utl_raw.bit_and function. It works very well, except that I'm encountering a massive performance hit, which hopefully is in the way I'm using it, rather than intrinsic to the speed at which utl_raw.bit_and itself performs..
With numbers, I do a query like this:
select count(1) from offer_a where bitand(bit_column, 51432) = 51432
With utl_raw.bit_and (and 16-byte RAW column), I am passing in a hex value (may not be the best thing? Would passing in binary be better?) and doing my query like this:
select count(1) from offer_a where utl_raw.bit_and(bit_column,hextoraw('00000000000000000020008000002ca1')) = hextoraw('00000000000000000020008000002ca1');
One million rows using bitand takes about a second, using utl_raw.bit_and like this takes 25 seconds or so!!! Hopefully it's something in the way I'm calling it, and there's a faster way?
Thank you!
Jake

Hmm.. Actually it may not be that simple.
I had created an index on the number column that oracle seems to consistently use if I do a query like:
select count(1) from scott.offer_b where
current_price >= 0 and
bitand(current_price, 9008574719100165) = 9008574719100165
(without the >= oracle seems to do a full table scan. The reason I created the index is that there's other columns in the data table, making larger blocks. I figured that an index, even though most of needs to be scanned, would be faster because I can cram many more rows into each block..?).
But if I drop the index on the number column, it takes about 12 secs/1m rows, in other words about half the time of the utl_raw.bit_and().
So it's possible that bitand on 64 bits takes about half the time of utl_raw.bit_and on 128 bits, which is very reasonable..
So maybe the real problem I have is why oracle is not using the equivalent index that I placed on the RAW column when I do:
select count(1) from scott.offer_b where
hex_bit_sig >= '00000000000000000020008000002ca1' and
utl_raw.bit_and(hex_bit_sig,'00000000000000000020008000002ca1') = '00000000000000000020008000002ca1';
(By the way I realized that I don't need to use the hextoraw - seems like just putting a hex number in '' is the right way to specify a raw anyway?)
So yes, I think that's the real problem - how can I get oracle to use the index I created on the RAW value

How can i improve performance of a horizontal parallax on an mobile device?

I've created a Horizontal Parallax website using Adobe Muse, and it works perfectly on a desktop machine, but as you use it on a mobile device such as an iPad, the performance becomes jerky and jumpy.
I added navigation buttons to jump to set keypoints, which again, work smoothly on a desktop, but then jump on a mobile device.
Is there any way to prevent this jumpy motion and make it more smooth?
Thanks in advance!

Its just scrolling images. A Horizontal Parallax, (the pages are placed in the project vertically, as suggested by adobe). There are no animated images, no videos either. All are just transparent PNGs with scroll effect attached.
It seems jumpy if you use it on the ipad, both through scrolling, but even worse if you use the navigation i've implemented, which is supposed to scroll to the anchor point.

How can I improve performance (image searching)

Hello,
My program makes many calls to a method that compares two images. It does this by using nested for-loops (one for x-pixel and one for y-pixel) to search through a BufferedImage image and use getRGB() to compare pixel-by-pixel to see if the two images are the same.
I've added a little bit of "optimisation" that first compares the central 5-pixles (the 5 pixels in an "X" shape in the middle of each image), and will only continue to search pixel-by-pixel if those are shown to be the same.
Of course, both searches (the optimisation-pre-search and the pixel-by-pixel search) will quit out of the loops and return false as soon as one non-matching pixel is found.
The problem is that it has to do this millions of times. For every single pixel in the source image, it has to go through one-by-one and compare, starting with the "optimised" speedy-compare and then moving on.

Try this:
public static boolean areImagesIdentical(File file1, File file2) throws IOException {
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How can I improve performance on my iPad 1. I am having problems with apps closing unexpectedly and also with slow response.

My iPad 1 has become almost unusable apps crash without warning and the response time is very slow.

1. Close all inactive apps in the Task Bar. Double-click the Home button and hold apps down for a second or two. Tap the minus sign to close app.
2. Hold the Sleep and Home button down for about 10 seconds until you see the Apple Logo.

How can I Improve the Performance using Global Temo Tables ??

Hi,
Can anyone tell me , How can i make use of Global Temporary Tables to improve the Performance.
I have few sample scripts ,
Say i have the View based on some Complex query like ,
CREATE OR REPLACE VIEW Profile_values_view AS
SELECT d.Profile_option_name, d.Profile_option_id, Profile_option_value,
u.User_name, Level_id, Level_code
FROM Profile_definitions d, Profile_values v, Profile_users u
WHERE d.Profile_option_id = v.Profile_option_id
AND ((Level_code = 'USER' AND Level_id = U.User_id) OR
(Level_code = 'DEPARTMENT' AND Level_id = U.Department_id) OR
(Level_code = 'SITE'))
AND NOT EXISTS (SELECT 1 FROM PROFILE_VALUES P
WHERE P.PROFILE_OPTION_ID = V.PROFILE_OPTION_ID
AND ((Level_code = 'USER' AND
level_id = u.User_id) OR
(Level_code = 'DEPARTMENT' AND
level_id = u.Department_id) OR
(Level_code = 'SITE'))
AND INSTR('USERDEPARTMENTSITE', v.Level_code) >
INSTR('USERDEPARTMENTSITE', p.Level_code));
Now i have created the Global temp Table as ,
CREATE GLOBAL TEMPORARY TABLE Profile_values_temp
Profile_option_name VARCHAR(60) NOT NULL,
Profile_option_id NUMBER(4) NOT NULL,
Profile_option_value VARCHAR2(20) NOT NULL,
Level_code VARCHAR2(10) ,
Level_id NUMBER(4) ,
CONSTRAINT Profile_values_temp_pk
PRIMARY KEY (Profile_option_id)
) ON COMMIT PRESERVE ROWS ORGANIZATION INDEX;
Now I am Inserting the Records into Temp table as
INSERT INTO Profile_values_temp
(Profile_option_name, Profile_option_id, Profile_option_value,
Level_code, Level_id)
SELECT Profile_option_name, Profile_option_id, Profile_option_value,
Level_code, Level_id
FROM Profile_values_view;
COMMIT;
Now what my doubt is, when do i need to execute the Insert Statement.
Say , if the View returns few millions of records , then loading such a data into Global Temporary table takes lot of time.
Then what is the use of Global Temporary tables and how can i improve the Performance using the same.
Raj

Thanks for the responce ,
There are 2 to 3 complex views in our database, and there always be more than 5000+ users will be workinf on the application and is OLTP application. Those complex views are killing the application performance.
I what i felt was, if i create the Global Temporary tables for thow views and will be able to load the one third million of records returned by the views in to cache and can improve the application performance.
I have created the Global Temporary tables for 2 views with the option On Commit Preserve , But after am inserting the records into the Temp table and when i Issue the commit statement, the Temp table is getting Cleared.
I really got surpised of this behaviour as i know that with the Option On Commit Preserve , the rows should retain in the Temp Table, Instead , it's getting cleared.
Pelase suggest , what to do ??
Raj

Improving performance of query with View

Hi ,
I'm working on a stored procedure where certain records have to be eleminated , unfortunately tables involved in this exception query are present in a different database which will lead to performance issue. Is there any way in SQL Server to store this query
in a view and store it's execution plan and make it work like sp.While I beleive it's kinda crazy thought but is there any better way to improve performance of query when accessed across databases.
Thanks,
Vishal.

Do not try to solve problems that you have not yet confirmed to exist. There is no general reason why a query (regardless of whether it involves a view) that refers to a table in a different database (NB - DATABASE not INSTANCE) will perform poorly.
As a suggestion, write a working query using a duplicate of the table in the current database. Once it is working, then worry about performance. Once that is working as efficiently as it can , change the query to use the "remote" table rather
than the duplicate. Then determine if you have an issue. If you cannot get the level of performance you desire with a local table, then you most likely have a much larger issue to address. In that case, perhaps you need to change your perspective
and approach to accomplishing your goal.

How can I improve my FMS performance?

Hi...
I have two FMS 3.5 streaming servers... Both have Windows Server 2003 x64 with 16 GB of RAM...
I'm streaming from a common storage and my Application.xml file is like this:
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<DisallowedProtocols>rtmp,rtmps,rtmpt</DisallowedProtocols>

<JSEngine>
    
    
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      <Server>
        
        
        
        
        <BufferRatio>0.5</BufferRatio>
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    </MsgQueue>
     
     
     
     
     
     
     
     
     
     
     <OutChunkSize>3072</OutChunkSize>
     
     
     
     
     
     
     
     
     <AggregateMessages enabled="false"></AggregateMessages>
     
     <AutoCloseIdleClients enable="true">
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          <MaxIdleTime>1200</MaxIdleTime>
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</Client>
</Application>
The Server.xml and fms.ini have default settings.
My RAM usage is always low... 1,1 GB... and also my CPU usage is low. The FMSCore.exe process reaches 630 MB usage and then stays at this level.
How can I use my server's RAM or have you any tips or suggestions to improve FMS performance with some special settings?
I tried to change this in fms.ini:
SERVER.FLVCACHE_MAXSIZE=500
to 1000 but the application crashes after it reaches 2GB of RAM.
Thanks in advance
best,
Marco

Hi,
Thanks for trying the different settings...
When we talk of tuning for the best performance, different settings are required for different scenarios, for example, a live broadcast would require aggregation of messages (if latency is OK) but a live conferencing solution might need to disable it. So unless the use case is little briefed it is tough to conclude on any generic settings to improve performance.
I would also like to comment on the FLVCache size. I recommend it to be set to 1/4 the size of your RAM. And you can safely tweak only the SERVER.MAXFLVCACHESIZE variable without worrying on the other variable (which is in percentage). This is supposed to take priority over all other settings.
If your use case is a vod, have 1/4 RAM as cache size, and also tweak the video buffer settings for mp4 (if you have mp4 content as well). OutchunkSize is another variable that you may want to tweak (at the cost of CPU and latency). You can aggregate the messages.
Also, you need to make sure of the client side buffer settings to match your FMS settings as well as your use case requirements.
Hope it all helps.
Thank you !

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