Large Database read into a List Object Memory Problem

Hi,
Im building a new database, ive just imported over 50,000 rows into the database across a number of tables from existing csv files.
I want to extract these rows into a List object. Once extracted i want to process them in a specific way. However when i try to read in over 20,000 rows i get an error which indicates the buffer is full
java.lang.OutOfMemoryError: Java heap space
at java.nio.ByteBuffer.wrap(ByteBuffer.java:350)Im currently using the DAO design pattern to read in the values. Could anyone provide me with some advise how i might read in so many rows without running out of memory. The current process is not only failing but is also extreamly slow.
Thanks in advance

h1400046 wrote:
Hi,
Thanks for your reply,
This database is fully normalised. Five tables, no relations between them at all.
The DAO design pattern was chosen so that each table may be selected individually. DAO usually means objects to me. What you're describing sounds more like Table Gateway.
This means that i get the values from each table in turn. (there isnt a single query). No possibility to JOIN? None whatsoever?
Five tables must be read for each select. Ouch.
Therefore i am selecting 5 times for each of the 50,000 rows and some of the rows will bring back more than one record for each table. So it's one object that has references to five others.
This OO object is tread back into a List object. Once i have this i want to then process this list as a whole. However this obejct gets to big and just kills the memoryYes, that's been clear all along.
I have been told that jdbc supports a cursor type mechanism which enables you to read from a result set in manageable chunks which can then be processed chunk by chunk without killing the memory. But i dont know how to do that or even if that is advisable.Yes, you can process chunk by chunk with JDBC. Check setFetchSize(), or manage the chunk size yourself.
I currently have primary keys in each table. I have indexs on both the primary and forigen keysSo there are relationships. I'll ask again - why not JOIN?
Can the database do any of the processing? What about calling a stored proc to create a cursor and iterate through the data on the server? Just bring the result over via JDBC.
%

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“If you want something you've never had, you need to do something you've never done.”
Don't forget to mark
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Problem with large databases.

Lightroom doesn't seem to like large databases.
I am playing catch-up using Lightroom to enter keywords to all my past photos. I have about 150K photos spread over four drives.
Even placing a separate database on each hard drive is causing problems.
The program crashes when importing large numbers of photos from several folders. (I do not ask it to render previews.) If I relaunch the program, and try the import again, Lightroom adds about 500 more photos and then crashes, or freezes again.
I may have to go back and import them one folder at a time, or use iView instead.
This is a deal-breaker for me.
I also note that it takes several minutes after opening a databese before the HD activity light stops flashing.
I am using XP on a dual core machine with, 3Gigs of RAM
Anyone else finding this?
What is you work-around?

Christopher,
True, but given the number of posts where users have had similar problems ingesting images into LR--where LR runs without crashes and further trouble once the images are in--the probative evidence points to some LR problem ingesting large numbers.
I may also be that users are attempting to use LR for editing during the ingestion of large numbers--I found that I simply could not do that without a crash occuring. When I limited it to 2k at a time--leaving my hands off the keyboard-- while the import occured, everything went without a hitch.
However, as previously pointed out, it shouldn't require that--none of my other DAMs using SQLite do that, and I can multitask while they are ingesting.
But, you are right--multiple single causes--and complexly interrated multiple causes--could account for it on a given configuration.

Placing a variable value into an XML Object

I am trying to figure out how I would get the value of a variable into an XML Object.
I have the variable
var dragonName:String = "Samuel";
var listing:XML = new XML();
listing = <thedragon>
                        <dragon>
                              <myname> dragonName.valueOf()</myname>
                         </dragon>
               </thedragon>
However, the dragon name does not show up when I go trace(listing);
How do I do it and should I have imported something as well or what?

yeah - in fact you can do all sort of things. This is extremely useful when you creating an XML dynamically e.g.
var names:Array = ["Sammy", "Samuel", "Sancho"];
var xml:XML =     <dragon>
                     <myname>{Math.floor(Math.random()*names.length) < 2 ? names[1] : names[Math.round(Math.PI) - 1]}</myname>
                  </dragon>;
or you can even run a function:
var xml:XML =     <dragon>
                     <myname>{dragonName()}</myname>
                  </dragon>;
private function dragonName():String {
   return "Samuel";

Make CA database read-only?

Is it possible to make Firefox not accept any new Certificate Authorities without user interaction?
Long story short, I have having a problem where Firefox is adding a CA to it's database that is hosing things up. The actual problem is with the cert that is being offered to me, and I am working with that system owner to fix the cert, but in the mean time I would like to have Firefox not ever load the CA into it's database. This new CA is added without the user being prompted at all. Simply visiting a specific website causes this new CA to be added to the list (but again, not trusted, just added to the list).
By default when it is loaded the new cert has no permissions so it is not trusted, but the problem is the fact that the CA that is added is a duplicate name with another known good CA in my list and it causes things to go wacky when there are two with the same name (different signatures, different issuer, the only thing the same is the nickname).
I know this isn't a problem with Firefox directly. In 99.9999% of cases when it adds an additional CA to the list it doesn't cause a problem at all because it is not trusted and it won't inherently allow the secure connection. But since fixing the real problem with the owner of the website is going to take a long time (weeks/months) I would like to put a band-aid on the symptom so that I can cut my maintenance of this topic down greatly.
I am running Red Hat Enterprise Linux 5.9 with Firefox 10.0.12 (RHEL distributed Firefox).
I could go into extreme detail to explain what is causing my problem, but the short question I have is "Is there a way to make the CA database read-only"?
I have tried editing the permissions of cert8.db in ~/.mozilla/firefox/*.default/ to only be readonly (0400) vice read-write (0600) currently. However this causes Firefox to have kittens when I try to use anything that reads the CA list so I had to change it back.
I have a hacky script to remove the CA using certutil, but since certutil uses the 'nickname' of the cert to decide which one to delete, and both the good cert and the bad cert have the same nickname I get worried I'll blow away the good one and not the bad one. So far it has consistently matched the bad cert, but I don't have enough confidence that it will do that every time to push it out to my users. If I could use certutil -D with something more specific than nickname (fingerprint, signature value, etc) I would be OK with that as well.
I know there are options to restrict user changes to things like proxies and the such, is there a similar way to do it with CAs? about:config doesn't appear show anything that looks like it would do it.
Can I have it prompt me when it tries to add a CA to the database and allow me to say yes/no?
I am OK if the change is something that requires manual intervention if we do decide to add another CA to the list. Currently I am having to repair this problem multiple times a day and new CAs don't come all that often.
Unfortunately, I can't simply upgrade to the latest Firefox as software restrictions are in place. I'm open to any ideas you may have.

Seems unlikely two unrelated CA or sub-CA certs would have the exact same issuer name. Was the name too generic? If they actually related and I assume created by your organization perhaps you could simply add the "Integration CA 456" certificate to your root store -- assuming you trust it.
Firefox validates certificate chains by looking up issuers, and in case of duplicates by default it grabs the one with the most recent "Not Before" date. There is a newer algorithm under development that won't stop at the first match but will continue to trying intermediate combinations until it finds a match or runs out of options. If you'd like to try it you need to add the boolean preference "security.use_libpkix_verification" and set it's value to true. This pref will not appear in about:config by default, but you can right-click in about:config to add it.

Send Crystal Report by email reading Domino email list

Hello all,
Do you know how do I configure Crystal Reports, so that when I address a report to be sent by email, it reads the contacts list in a Domino server (lotus notes)?
Thanks in advance,
Cristina.

As of CR 9 all functionality has changed, database, exporting, API's etc.
Also, by default the export dll's are not installed. Go into add/remove programs and change CR. Select the modify, or what ever it is called on your OS, and expand the export types and scroll down until you see Lotus Domino...
Test again
Thank you
Don

Large Database read into a List Object Memory Problem

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