Report download is slow for large data sets

APEX 4.1
I have a classic report which retrieves around 1lakh plus rows.
While downloading report as excel it takes 5-10 mins for download.
Any solution for this?
Can we download in sets like first 1000 records n then next 1000 etc.?

what I understood is we can export CSV in background using Kubicek's export_to_excel package.
1.We can provide a button to execute procedure. - jfosteroracle says custom CSV download was slow
2.Use job to download excel in background. - need to check with client if they wish to go ahead with this.
Correct. You need to use the custom package and button on the page to submit the request for downloading the report in back-end.
Is it possible to zip a file first and then download it?
No. As of my knowledge it's not possible to zip a file and then download it.
Thanks
Lakshmi

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XML Solutions for Large Data Sets

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I'm working with a large data set (9 million records comprising 36 gigabytes) and am exploring the use of XML with it.
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What kind of throughputs are possible loading XML records from CLOBs into multiple tables (using server-side Java apps)?
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Just would like to identify myself (I'm the submitter):
Michael Driscoll <[email protected]>.
null

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Looping is very slow on large data set

Hi All,
I need suggestion in optimizing the below looping scenario .
Sample data in the table , For easy understanding I kept only 4 columns actual source has 56 columns
Input :
#Final
RwNum
JobSource
RuleName
PackageType
1
Presubmission
GameRating
Xap
2
PostSubmission
GameRating
Xap
3
Presubmission
GameRating
NULL
4
Presubmission
TCRRule
Xap
5
PostSubmission
NULL
Xap
6
Submission
NULL
Xap
I need to iterate row by row in the above table to compare the data with the rest of the table . i.e. First get the data for RwNum =1 and compare with all the other rows in the table (i.e. Rwnum 2,3,4,5,6 ) to merge that data in below
output format and repeat the same process for all the rest of rows.
Expected Output :
#Final
RwNum
JobSource
RuleName
PackageType
1
Presubmission
GameRating
Xap
2
PostSubmission
GameRating
Xap
4
Presubmission
TCRRule
Xap
6
Submission
NULL
Xap
In the final output , RwNum 1 is the merged result of RwNum 1 & 3 . Similarly RwNum 2 in the output is the merged result of 2 & 5   and other records remain As Is.
So the query I wrote is below :
While (@TopRwNum <=6
Begin
While (@InnerRwNum <= 6)
Begin
SELECT
---- Columns list
FROM          #final Fr
JOIN #final Ne
ON
              Fr.RwNum
=@TopRwNum AND Ne.RwNum
=@InnerRwNum
AND @TopRwNum <> @InnerRwNum
Where
--- Conditional logic to compare and merge the data
The above query executed in 10 secs
The above query is working when the count of rows is small , but if the #final has ~1000 rows then the no of times the above code
has to iterate is 1000 *1000 ~= 1000000 times ( as there are outer and inner loops need to run for 1000 times each ) . Then the above
while loop logic is taking around 20 mins
Can we optimize the above code to make iteration faster ? . Any ideas would be greatly appreciated .

Hi All ,
Thanks for your replies .Sorry if haven't followed the forum rules , please forgive me . I kept only images as they help to understand the scenario
better . Now here i am posting the DDL scripts and also the expected output with some more columns.( I have used table variables here)
DECLARE @Tab TABLE (
RwNum INT,
JobParentID UNIQUEIDENTIFIER,JobSource      NVARCHAR(MAX),
PackageType NVARCHAR(MAX),
UpdateType NVARCHAR(MAX),
IsAutoPassed NVARCHAR(256),
IsCanceled NVARCHAR(256),
IsSkipped NVARCHAR(256),
Result NVARCHAR(256),
Fired NVARCHAR(256),
RuleName NVARCHAR(256)
INSERT INTO @Tab
SELECT 1,'7ca42851-c3d2-42da-b5b9-d40392ae24fb','PreSubmissionSource','Xap',         'FullUpdate','','','FALSE','Pass','FALSE','RuleValidationResult^XboxLive'
UNION
SELECT 2,'7ca42851-c3d2-42da-b5b9-d40392ae24fb','PostSubmission','Xap',         'PartialUpdate','FALSE','','TRUE','Failed','FALSE','RuleValidationResult^GameCategoryNameChange'
UNION
SELECT 3,'7ca42851-c3d2-42da-b5b9-d40392ae24fb','PreSubmissionSource','Xap',         '','TRUE','TRUE','','Pass','FALSE','RuleValidationResult^XboxLive'
UNION
SELECT 4,'7ca42851-c3d2-42da-b5b9-d40392ae24fb','PreSubmissionSource','Xap',         '','TRUE','TRUE','','Pass','FALSE','RuleValidationResult^CumulativeDownload'
UNION
SELECT 5,'7ca42851-c3d2-42da-b5b9-d40392ae24fb','PostSubmission','Xap',         'PartialUpdate','FALSE','','TRUE','Failed','FALSE','PreinstalledPackage'
UNION
SELECT 6,'7ca42851-c3d2-42da-b5b9-d40392ae24fb','PreSubmissionSource','Xap',         'PartialUpdate','TRUE','TRUE','','Pass','FALSE','RuleValidationResult^CumulativeDownload'
UNION
SELECT 7,'7ca42851-c3d2-42da-b5b9-d40392ae24fb','PreSubmissionSource','Xap',         'FullUpdate','','','','Pass','','RuleValidationResult^XboxLive'
UNION
SELECT 1,'2004235d-af05-4e29-ab8d-50b80a088dd4','PreSubmissionSource','Xap',         'FullUpdate','TRUE','TRUE','','Pass','FALSE','RuleValidationResult^CumulativeDownload'
UNION
SELECT 2,'2004235d-af05-4e29-ab8d-50b80a088dd4','PreSubmissionSource','Xap',         'FullUpdate','TRUE','','FALSE','','FALSE','RuleValidationResult^CumulativeDownload'
SELECT * FROM @Tab ORDER BY 2 DESC ,1 ASC
Original source table doesn't RwNum column . In order for me to iterate row by row on the above table i have created "RwNum" column . This column
has unique ID for every row of a JobIDParent. RwNum column is generated as below
ROW_NUMBER() OVER( ORDER BY JobIDParent) AS RwNum,
The output should be below :
DECLARE @Output TABLE (
RwNum INT,
JobParentID UNIQUEIDENTIFIER,JobSource      NVARCHAR(MAX),
PackageType NVARCHAR(MAX),
UpdateType NVARCHAR(MAX),
IsAutoPassed NVARCHAR(256),
IsCanceled NVARCHAR(256),
IsSkipped NVARCHAR(256),
Result NVARCHAR(256),
Fired NVARCHAR(256),
RuleName NVARCHAR(256)
INSERT INTO @Output
SELECT 1,'7ca42851-c3d2-42da-b5b9-d40392ae24fb',    'PreSubmissionSource',    'Xap',         'FullUpdate','TRUE','TRUE','FALSE','Pass','FALSE','RuleValidationResult^XboxLive'
UNION
SELECT 2,'7ca42851-c3d2-42da-b5b9-d40392ae24fb',    'PostSubmission', 'Xap',         'PartialUpdate','FALSE','','TRUE','Failed','FALSE','RuleValidationResult^GameCategoryNameChange'
UNION
SELECT 5,'7ca42851-c3d2-42da-b5b9-d40392ae24fb',    'PostSubmission', 'Xap',         'PartialUpdate','FALSE','','TRUE','Failed','FALSE','PreinstalledPackage'
UNION
SELECT 4,'7ca42851-c3d2-42da-b5b9-d40392ae24fb',    'PreSubmissionSource',    'Xap',         'PartialUpdate','TRUE','TRUE','','Pass','FALSE','RuleValidationResult^CumulativeDownload'
UNION
SELECT 1,'2004235d-af05-4e29-ab8d-50b80a088dd4',    'PreSubmissionSource',    'Xap',         'FullUpdate','TRUE','TRUE','FALSE','Pass','FALSE','RuleValidationResult^CumulativeDownload'
SELECT * FROM @Output ORDER BY 2 DESC ,1 ASC
Merge rules to generate the above Output :
All the below rules should
be satisfied to merge two rows
1) We only need to merge the data that is related to the same JobIDParent
2) Data in column for any two merging rows should not conflict .
I.e. Data in a column of a merging row should not be different to the data in the same column for the other merging row(only if both rows are having not NULL value in
that column )
3) we can merge two rows ,only if the data in all the columns satisfy any of the below cases
case i) If
the data in the column of a row is having null/EmptySpace & the data in the same column for the other row is a valid value i.e. non empty or not null
case ii) Data
in a column of a row is equal to the data in the same column of the other row .
Output analysis by applying above rules:
In the @Output analysis for JobIDParent '7CA42851-C3D2-42DA-B5B9-D40392AE24FB'
i)RwNum =1 is formed as a result of merge using the above rules from RwNum 3 & RwNum 7 .First the RowNum 1
and 3 are merged and the output of these two rows are merged with RwNum 7
ii) RwNum =2 is not merged with any of the rows in fact table , as the no row in the table satisfy all the merge
rules with RwNum =2
iii) RwNum = 4 is formed as a result of merge using the above rules from RwNum 6 .
iv) RwNum =5 is not merged with any of the rows in fact table , as the no row in the table satisfy all the
merge rules with RwNum =5
In the @Output analysis for JobIDParent '7CA42851-C3D2-42DA-B5B9-D40392AE24FB'
i)RwNum =1 is formed as a result of merge using the above rules from RwNum 2.
In this way we want the rows to be merged on the table
Sorry if my earlier post is not understandable .
Thanks in advance.

Working with Large data sets Waveforms

When collection data at a high rate ( 30K ) and for a long period (120 seconds) I'm unable rearrange the data due to memory errors, is there a more efficient method?
Attachments:
Convert2Dto1D.vi ‏36 KB

Some suggestions:
Preallocate your final data before you start your calculations. The build array you have in your loop will tend to fragment memory, giving you issues.
Use the In Place Element to get data to/from your waveforms. You can use it to get single waveforms from your 2D array and Y data from a waveform.
Do not use the Transpose and autoindex. It is adding a copy of data.
Use the Array palette functions (e.g. Reshape Array) to change sizes of current data in place (if possible).
You may want to read Managing Large Data Sets in LabVIEW.
Your initial post is missing some information. How many channels are you acquiring and what is the bit depth of each channel? 30kHz is a relatively slow acquisition rate for a single channel (NI sells instruments which acquire at 2GHz). 120s of data from said single channel is modestly large, but not huge. If you have 100 channels, things change. If you are acquiring them at 32-bit resolution, things change (although not as much). Please post these parameters and we can help more.
This account is no longer active. Contact ShadesOfGray for current posts and information.

Need to load large data set from Oracle table onto desktop using ODBC

I don't have TOAD nor any other tool for querying the database. I'm wondering how I can load a large data set from an Oracle table onto my desktop using Excel or Access or some other tool using ODBC or not using ODBC if that's possible. I need results to be in a .csv file or something similar. Speed is what is important here. I'm looking to load more than 1 million but less than 10 million records at once. Thanks.

hillelhalevi wrote:
I don't have TOAD nor any other tool for querying the database. I'm wondering how I can load a large data set from an Oracle table onto my desktop using Excel or Access or some other tool using ODBC or not using ODBC if that's possible. I need results to be in a .csv file or something similar. Speed is what is important here. I'm looking to load more than 1 million but less than 10 million records at once. Thanks.
Use Oracle's free Sql Developer
http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/index.html
You can just issue a query like this
SELECT /*csv*/ * FROM SCOTT.EMP
Then just save the results to a file
See this article by Jeff Smith for other options
http://www.thatjeffsmith.com/archive/2012/05/formatting-query-results-to-csv-in-oracle-sql-developer/

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Hi Folks -
I have LabVIEW 2009 64-bit version running on a Win7 64-bit OS with Intel Xeon dual quad core processor, 16 gbyte RAM. With the release of this 64-bit version of LabVIEW, I expected to easily be able to handle x-ray computed tomography data sets in the 2 and 3-gbyte range in RAM since we now have access to all of the available RAM. But I am having major problems - sluggish (and stoppage) operation of the program, inability to perform certain operations, etc.
Here is how I store the 3-D data that consists of a series of images. I store each of my 2d images in a cluster, and then have the entire image series as an array of these clusters. I then store this entire array of clusters in a queue which I regularly access using 'Preview Queue' and then operate on the image set, subsets of the images, or single images.
Then enqueue:
I remember talking to LabVIEW R&D years ago that this was a good way to do things because it allowed non-contiguous access to memory (versus contigous access that would be required if I stored my image series as 3-D array without the clusters) (R&D - this is what I remember, please correct if wrong).
Because I am experiencing tremendous slowness in the program after these large data sets are loaded, and I think disk access as well to obtain memory beyond 16 gbytes, I am wondering if I need to use a different storage strategy that will allow seamless program operation while still using RAM storage (do not want to have to recall images from disk).
I have other CT imaging programs that are running very well with these large data sets.
This is a critical issue for me as I move forward with LabVIEW in this application. I would like to work with LabVIEW R&D to solve this issue. I am wondering if I should be thinking about establishing say, 10 queues, instead of 1, to address this. It would mean a major program rewrite.
Sincerely,
Don

First, I want to add that this strategy works reasonably well for data sets in the 600 - 700 mbyte range with the 64-bit LabVIEW.
With LabVIEW 32-bit, I00 - 200 mbyte sets were about the limit before I experienced problems.
So I definitely noticed an improvement.
I use the queuing strategy to move this large amount of data in RAM. We could have used other means such a LV2 globals. But the idea of clustering the 2-d array (image) and then having a series of those clustered arrays in an array (to see the final structure I showed in my diagram) versus using a 3-D array I believe even allowed me to get this far using RAM instead of recalling the images from disk.
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data out of arrays to minimize data copies. I expect I might have to
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What I can do is send someone (in US) via large file transfer a 1.3 - 2.7 gbyte set of image data - and see how they would best advise on storing and extracting the images using RAM, how best to optimize the RAM usage, and not make data copies. The operations that I apply on the images are irrelevant. It is the storage, movement, and extractions that are causing the problems. I can also show a screen shot(s) of how I extract the images (but I have major problems even before I get to that point),
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Don

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Hello, I'm looking for some guidance on how BI can help me. I am a business analyst in a health solutions firm, but not proficient in SQL. However, I have to work with large data sets that just exceed the capabilities of Excel.
Basically, I'm having to use Excel to manaully search for key terms and apply a values to those results. For instance, I have a medical claims file, with Provider Names, Tax ID, Charges, etc. It's 300,000 records long and 15-25 columsn wide. I need to search for key terms in the provider name like Ambulance, Fire Dept, Rescue, EMT, EMS, etc. Anything that resembles an ambulance service. Also, need to include abbreviations of them such as AMB, FD, or variations like EMT, E M T, EMS, E M S, etc. Each time I do a search, I have filter and apply an "N/A" flag.
That's just one key term. I also have things like Dentists or DDS, Vision, Optomemtry and a dozen other Provider Types that need to be flagged as "N/A".
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Some insight would be very helpful. Thanks.

I am not sure if you are looking for an explanation about different BI products? If so, may be this forum is not the place to get a straight answer.
But, Information Discovery product suite might be useful in your case. Regarding the "large date set" you mentioned, searching and analyzing 300,000 records may not be considered a large data set at least in Endeca standards :).
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Hello All,
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On 25.04.2012 01:10, Alan McMorran wrote:
> How large are you talking about? I've found QVTo scales pretty well as
> the dataset size increases but we're using at most maybe 3-4 million
> objects as the input and maybe 1-2 million on the output. They can be
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> cases to accomodate the full transformation process.
Ok, that is good to know. We will be working in roughly the same order
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Apparently not, quoting
http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html:
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Regards
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I want to get User login report in Active Directory for specific date and time e.g user logged in at15-01-2015 from 8:00am to 4:00pm
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Waiting for reply please

You can identify the last logon date and time using my script here: https://gallery.technet.microsoft.com/scriptcenter/Get-Active-Directory-User-bbcdd771
If you would like to get back in time and see when the user did a logon / logoff then you need to have auditing enabled. Once done, you can records from Security log in the event viewer: https://social.technet.microsoft.com/Forums/windowsserver/en-US/98cbecb0-d23d-479d-aa65-07e3e214e2c7/manage-active-directory-users-logon-logoff-events
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Hello Experts,
I have a report which runs on date selection.
When I run the report for say 01.01.2000 -31.12.2010 whcih contains 95% of the data , the report output is coming with in a minute.
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Vamsi

Hello Experts,
I have a report which runs on date selection.
When I run the report for say 01.01.2000 -31.12.2010 whcih contains 95% of the data , the report output is coming with in a minute.
But when I ran the report from 01.01.2011 - 31.12.2011 , or say 01.01.2011 for a single day , where the data set is hardly 3k records,the report is runing for long time 15 - 20 minutes and not showing output.
But when i remove this variable and run the report , it is coming again with in a minute.
One weird thing is when i ran the report from 01.01.2000 - 31.12.2011 it is also coming with in a minute, but when i ran for 01.01.2011 single day it is not coming.
Can any one share some inputs on this one.
Thanks
Vamsi

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You can use the drill down strategy, well described by my friend Kan:
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Hi,
In SSRS 2008 R2, I have a main report and a drill through report from one of the main report's column. The drill through report works mostly except if the data is too large i.e. more than 1 million records. How to fix this problem?
Thanks,
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)t
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Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

Report download is slow for large data sets

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