Very-large-scale searching in J2EE

I'm looking to solve a very-large-scale searching problem. I am creating a site
where users can search a table with five million records, filtering and sorting
independantly on ten different columns. For example, the table might be five million
customers, and the user might choose "S*" for the last name, and sort ascending
on street name.
I have read up on a number of patterns to solve this problem, but anticipate some
performance issues. I'll explain below:
1) "Page-by-Page Iterator" or "Value List Handler"
In this pattern, it appears that all records that match the search criteria are
retrieved from the database and cached on the application server. The client (JSP)
can then access small pieces of the cached results at a time. Issues with this
include:
- If the customer record is 1KB, then wide search criteria (i.e. last name =
S*) will cause 1 GB transfer from the database server to app server, and then
1GB being stored on the app server, cached, waiting for the user (each user!)
to ask for the next 10 or 100 records. This is inefficient use of network and
memory resources.
- 99% of the data transfered from the database server will not by used ... most
users flip through a couple of pages and then choose a record or start a new search
2) Requery the database each time and ask for a subset
I haven't seen this formalized into a pattern yet, but the basic idea is this:
If a clients asks for records 1-100 first (i.e. page 1), only fetch that many
records from the db. If the user asks for the next page, requery the database
and use the JDBC API's ResultSet.absolute(int row) to start at record 101. Issue:
The query is re-performed, causing the Oracle server to do another costly "execute"
(bad on 5M records with sorting).
To solve this, I've beed trying to enhance the second strategy above by caching
the ResultSet object in a stateful session bean. Unfortunately, this causes a
"ResultSet already closed" SQLException, although I ensure that the Connection,
PreparedStatement, and ResultSet are all stored in the EJB and not closed. I've
seen this on newsgroups ... it appears that WebLogic is forcing the Connection
closed. If this is how J2EE and pooled connections work, then that's fine ...
there's nothing I can really do about it.
Another idea is to use "explicit cursors" in Oracle. I haven't fully explored
it yet, but it wouldn't be a great solution as it would be using Oracle-specific
functionality (we are trying to be db-agnostic).
More information:
- BEA WebLogic Server 8.1
- JDBC: Oracle's thin driver provided with WLS 8.1
- Platform: Sun Solaris 5.8
- Oracle 9i
Any other ideas on how I can solve this issue?

Michael McNeil wrote:
I'm looking to solve a very-large-scale searching problem. I am creating a site
where users can search a table with five million records, filtering and sorting
independantly on ten different columns. For example, the table might be five million
customers, and the user might choose "S*" for the last name, and sort ascending
on street name.
I have read up on a number of patterns to solve this problem, but anticipate some
performance issues. I'll explain below:
1) "Page-by-Page Iterator" or "Value List Handler"
In this pattern, it appears that all records that match the search criteria are
retrieved from the database and cached on the application server. The client (JSP)
can then access small pieces of the cached results at a time. Issues with this
include:
- If the customer record is 1KB, then wide search criteria (i.e. last name =
S*) will cause 1 GB transfer from the database server to app server, and then
1GB being stored on the app server, cached, waiting for the user (each user!)
to ask for the next 10 or 100 records. This is inefficient use of network and
memory resources.
- 99% of the data transfered from the database server will not by used ... most
users flip through a couple of pages and then choose a record or start a new search
2) Requery the database each time and ask for a subset
I haven't seen this formalized into a pattern yet, but the basic idea is this:
If a clients asks for records 1-100 first (i.e. page 1), only fetch that many
records from the db. If the user asks for the next page, requery the database
and use the JDBC API's ResultSet.absolute(int row) to start at record 101. Issue:
The query is re-performed, causing the Oracle server to do another costly "execute"
(bad on 5M records with sorting).
To solve this, I've beed trying to enhance the second strategy above by caching
the ResultSet object in a stateful session bean. Unfortunately, this causes a
"ResultSet already closed" SQLException, although I ensure that the Connection,
PreparedStatement, and ResultSet are all stored in the EJB and not closed. I've
seen this on newsgroups ... it appears that WebLogic is forcing the Connection
closed. If this is how J2EE and pooled connections work, then that's fine ...
there's nothing I can really do about it.
Another idea is to use "explicit cursors" in Oracle. I haven't fully explored
it yet, but it wouldn't be a great solution as it would be using Oracle-specific
functionality (we are trying to be db-agnostic).
More information:
- BEA WebLogic Server 8.1
- JDBC: Oracle's thin driver provided with WLS 8.1
- Platform: Sun Solaris 5.8
- Oracle 9i
Any other ideas on how I can solve this issue? Hi. Fancy SQL to the rescue! If the table has a unique key, you can simply send a
query per page, with iterative SQL that selects the next N rows beyond what was
selected last time. Eg:
Let variable X be the highest key value you've seen so far. Initially it would
be the lowest possible value.
select * from mytable M
where ... -- application-specific qualifications...
and M.key >= X
and (100 <= select count(*) from mytable MM where MM.key > X and MM.key < M.key and ...)
In English, this says, select all the qualifying rows higher than what I last saw, but
only those that have fewer than 100 qualifying rows between the last I saw and them (ie:
the next 100).
When processing this query, remember the highest key value you see, and use it for the
next query.
Joe

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Very large HEAPDUMP files are generated when executing BI Web reports NW7.0

Dear Gurus,
I´m facing a new problem.
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?We will provide an optimization of the memory requirement in the next Support Package Stack. With this optimization, you can display a report as "stateless", so that the system can then immediately release the memory that is required to set up the result set.?
I´m using Support Stack 15 for ABAP and Java, but I don´t have more information about this problem or stateless function in another note. And I don´t know how can I use this STATELESS function in BI.
Anobody have any idea to solve this problem?
Thanks a lot,
Carlos

Hi,
Heap dumps are generated when there is an inmbalance in Java VM parameterization..
Also please remove the parameter "-XX:+HeapDumpOnOutOfMemoryError " in Config tool, so that heap dumps will not generated and fill up the disk space..
My advise is to send the heap dumps to SAP for recommendations.. Meanwhile check with SAP notes for Java VM recommendations..
Regards
Thilip Kumar
Edited by: Thilip Kumar on Sep 30, 2008 5:58 PM

When printing from an online PDF, the page prints in extra large scale. How do I fix this?

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This can happen when Firefox has misread the paper size from the information supplied by Windows. Clearing it can involve finding some obscure settings, but here goes:
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Hi David,
dvoran wrote:
Don't you have similar issues when the libraries exceed several thousand images? If not what's your secret to image management.
No, I don't .
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I use one, single, personal Library. It is my master index of every digital photo I've recorded.
I import every shoot into its own Project.
I name my Projects with a verbal identifier, a date, and a location.
I apply a metadata pre-set to all the files I import. This metadata includes my contact inf. and my copyright.
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To count number of occurances of a char in a very large string

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My screen got very large - much so I couldn't access some icons - I turned it off and back on and now it's so big I can't even put my code in to get turned on

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We are experiencing this meesage when compiling an ABAP WEB DYNPRO Application: "LOAD UNIT OF COMPONENT IS VERY LARGE (GENERATION LIMIT)"
When Checking the Generation Limits In the Context menu, I have determined our size of Generated Load in bytes is to big.
The documentation of recommendations is to restructure the program. I am not clear what this means and how this would reduce the Generation Load in bytes. Any ideas would be appreciated.

> How should we reorganize the application and at the same time ensure smooth and user-friendly handling?
We only want to use one Explorer window.
Using multiple components doesn't mean that the user will notice any difference. Component usages can be embedded within one another. Using the ALV for instance is a perfect example of a component usage.
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I have several very large images that require minor editing. The tasks that I require are only basic rotation, cropping, and maybe minor color adjustments.
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With images this size, when I try to perform any operation on the entire image, like a 3 deg rotation, fireworks simply times out. Maybe it is because it can't generate the preview image at that size, maybe it simply can't calculate the image at that size. If it is just the preview image, is there a way to lower the quality (say, jpeg quality of 5%) of the preview image only but when I export the image, I can keep it at 100%?
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(Yes, I did search, but the forums search seemed mildly useless and engine results consistently returned nothing)

Fireworks is not designed to work with images of this size. It's a screen graphics application. Photoshop would be a better option here, or other software designed for working with high resolution files.
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HELP!! Very Large Spooling / File Size after Data Merge

My question is: If the image is the same and only the text is different why not use the same image over and over again?
Here is what happens...
Using CS3 and XP (P4 2.4Ghz, 1GB Ram, 256MB Video Card) I have taken a postcard pdf (the backside) placed it in a document, then I draw a text box. Then I select a data source and put the fields I wish to print (Name, address, zip, etc.) in the text box.
Now, under the Create Merged Document menu I select Multiple Records and then use the Multiple Records Layout tab to adjust the placement of this postcard on the page. I use the preview multiple records option to lay out 4 postcards on my page. Then I merge the document (it has 426 records).
Now that my merged document is created with four postcards per page and the mailing data on each card I go to print. When I print the file it spools up huge! The PDF I orginally placed in the document is 2.48 MB but when it spools I can only print 25 pages at a time and that still takes FOREVER. So again my question is... If the image is the same and only the text is different why not use the same image over and over again?
How can I prevent the gigantic spooling? I have tried putting the PDF on the master page and then using the document page to create the merged document and still the same result. I have also tried createing a merged document with just the addresses then adding the the pdf on the Master page afterward but again, huge filesize while spooling. Am I missing something? Any help is appreciated :)

The size of the EMF spool file may become very large when you print a document that contains lots of raster data
View products that this article applies to.
Article ID : 919543
Last Review : June 7, 2006
Revision : 2.0
On This Page
SYMPTOMS
CAUSE
RESOLUTION
STATUS
MORE INFORMATION
Steps to reproduce the problem
SYMPTOMS
When you print a document that contains lots of raster data, the size of the Enhanced Metafile (EMF) spool file may become very large. Files such as Adobe .pdf files or Microsoft Word .doc documents may contain lots of raster data. Adobe .pdf files and Word .doc documents that contain gradients are even more likely to contain lots of raster data.
Back to the top
CAUSE
This problem occurs because Graphics Device Interface (GDI) does not compress raster data when the GDI processes EMF spool files and generates EMF spool files.
This problem is very prominent with printers that support higher resolutions. The size of the raster data increases by four times if the dots-per-inch (dpi) in the file increases by two times. For example, a .pdf file of 1 megabyte (MB) may generate an EMF spool file of 500 MB. Therefore, you may notice that the printing process decreases in performance.
Back to the top
RESOLUTION
To resolve this problem, bypass EMF spooling. To do this, follow these steps:1. Open the properties dialog box for the printer.
2. Click the Advanced tab.
3. Click the Print directly to the printer option.
Note This will disable all print processor-based features such as the following features: N-up
Watermark
Booklet printing
Driver collation
Scale-to-fit
Back to the top
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Back to the top
MORE INFORMATION
Steps to reproduce the problem
1. Open the properties dialog box for any inbox printer.
2. Click the Advanced tab.
3. Make sure that the Print directly to the printer option is not selected.
4. Click to select the Keep printed documents check box.
5. Print an Adobe .pdf document that contains many groups of raster data.
6. Check the size of the EMF spool file.

Applying Oil Paint Filter to Large Scale Images

I need to apply the effects available from the Oil Paint filter to very large, 80mb images. The filter works exactly as I need it to on small images, but not at large scale. A comment I have heard in a Lynda.com video on the Oil Paint filter mentioned that the filter does not work well on large images. However, I REALLY need this, even if I need to pay someone to write a program that can do it! Does anyone know if / how I can get the filter to work for large images and / or if there is a third-party plug-in that will provide the same results? Having this filter work on large scale images could make or break a business idea I have so finding a solution is extremely important to me.

What's the problem you're having with applying it to an 80 MB image? Is it that the effects don't scale up enough?
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If it's just that the sliders can't go high enough, given that it's a very abstract look you're trying to achieve, have you considered applying it at a downsized resolution, then upsampling, then maybe applying it again? This is done that way...
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Acrobat xi makes my icons very large and the program very large. It is like everything is super big. Then it really does not work well to view files. What can I do?

My Acrobat XI enlarges my desktop, and the program is also very large. I cannot see the whole screen because it is so large. When I end Acrobat everything returns to normal. I just want to use Acrobat XI to read pdf files.

Hi Pat, that is the problem I am having. I have tried to change my scale for screen settings to 100%, but every time I change it, the next time I open the program, it reverts to system settings. It is not saving the new change I made. I have looked all over for a save command but there isn’t any. I even went to my regedit settings and did exactly what the instructions say. Still the same problem. Everything is at least 200%. Once I exit the Reader, everything reverts to normal. What am I doing wrong? Or what else can I do?
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Working w/ large scale AI files

What is the best way to work with large scale (wall mural) files that contain many gradients, shadows. etc. Any manipulations take a considerable time to redraw. Files are customer created, and we are then manipulating from there in-house. We have some fairly robust machines ( mac pro towers- 14GB RAM, RAID scratch disk).. I would guess there is a way to work in a mode that does not render effects, allowing for faster manipulation? Any help would be great- and considerably help reduce our time.
First post- sorry if did something wrong- question / title wise/
THX!

In a perfect world, the customers would be creating their Illustrator artwork with the size & scale of the final image in mind. It's very difficult to get customers (who often have no formal graphic design training and are self taught at learning Illustrator & Photoshop) to think about the basic rule of designing for the output device -a graphics 101 sort of thing.
Something like a large wall mural, especially one that is reproduced outdoors, can get by just fine with Illustrator artwork using raster effects settings of 72ppi or even less than that. Lots of users will have a 300ppi setting applied. 300ppi is fine for a printed page being viewed up close. 300ppi is sheer overkill for large format use.
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Print comes out very large and oversize on my paper

I have photosmart 6180. When I print my stuff, suddenly everything is coming out oversized and very very large. One page takes about 3 sheets to print. How can I correct this setting? My emails will print normal size but not the stuff from the website ;

Hi Gatorjack61,
What operating system are you using ?
What about if you print a photo that is saved on your computer, does it look normal or oversized ?
You can try the steps below which were suggestions from banhien and Pushkarpathania in this post.
You can shrink before sending to printer (well also enlarge).
Just use Print > Print Preview
Under Shrink small drop down window, just select the right % for you.
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1. Open Internet Explorer by clicking the Start button . In the search box, type Internet Explorer, and then, in the list of results, click Internet Explorer.
2. Click the arrow next to the Print button , and then click Print Preview.
3. In the Change Print Size list SHRINK TO FIT , click Custom.
4. In the Custom Size text box, specify how large you want the webpage to be printed by setting a percentage. This will enlarge the printed size of the entire webpage, but it might result in some of the webpage being cut off in the printed document.
Hope this is helpful.
If I helped you at all it would be great if you clicked the blue kudos star!
If I solved your post please mark it as solved to help others.
I'm a printer tech with HP.

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