Intermitent slowness

Java 6 update 5 (both)
Jboss 4.2.3GA (Server 1) and Jboss 4.2.2GA (Server 2)
Oracle 10.1.0.2 (Server 1) and 10.1.0.5 (Server 2)
I have avery strange issue that I have no idea how to resolve. I don't even know what causes it. Basically, some queries that are run through jdbc from the web application (a war file running on JBoss 4.2.3GA (same thing happens whe we run it on 4.2.2GA)) take forever to run.. Sometimes! Other times they are fast. When the same query is run through just a regular SQL query tool like oracle Sql Developer, always run fast. What has been happening is this:
The users are using the application, everything runs fast. Then it suddenly shows down to a crawl. The same functions are being used, same queries executed when it's running fast and when it's running slow. I log into the server and am monitoring the Processes in Task Manager. When the application runs fast the oracle process, the one for database itself, is taking up anywhere from 00 to 14 at the highest percent of the CPU usage. When the app slows down, oracle process cpu usage jumps up to 25 - 37%. The amount of people logged into the app have no visible impact on the speed. You can have one or 25 people logged in and it's just as slow. You can have the same 25 people logged in and it's fast.
For the first month of using the program there wasn't a problem. Then for a few weeks we didn't use it and when we started using it again the problem manifested. I checked w/ the guys responsible for the servers they say no maintanance has been done on the hardware or software of the servers.
How we tried to fix the problem:
re-install Oracle (didn't work)
Put system.out.printlns all over the code. In one case where I had the S.o.p before and after the line that queries the database, the before part was printed out, but not the after. It's like the thread never came back. Now it's comming back, just taking a really really long time.
Another thing we did is try to upgrade the oracle driver that the server uses. I'm not sure which one was on there in the first place since both are named ojdbc14.jar, but the old one had the last modification date of 1/27/2005 and the one we downloaded for our version of oracle.. well I don't know it just fives the date and time of when I downloaded it. But here's the strange part: replacing the driver seems to have fixe the problem for a few days. Everything started running fast again... Then after a few days it all slowed down to a crawl. Just restarting jboss and clearing the temp and work folders didn't work. So what we did, is replaced the new driver with the old one again, just to see what happens.... The app started running fast again. This again lasted for a couple of days then it slowd down. Then we replaced the driver w/ the new one again and it started running normally again and so on. Finally replacing the driver back it forward stopped working (what surprises me is that it worked in the first place). Another thing that seemed to fix the slowness for about 20 minutes or so is restarting the server itself.
sounds like a memory leak, maybe but the memory usage is low and doesn't go up when the slowness happens. Restarting jboss and clearing temp and work and data folders doesn't do anything either.
The difference in speed between when the app works as it's supposed to and when it's slow is drastic. When it's fast it takes about a second to three seconds to get from one screen to the next. When it's slow it can take from 30 seconds to 2 minutes. Same queries are being run.
We tried it on 2 different servers. Same problem on both. One of them is a dedicated server for the app. It also houses the database. And no other program is connected to the database except this one.
Sorry for the long post. I'm not sure whether the problem is Oracle, JDBC driver, our program or something else.
If anyone has any idea as to what might be causing this and how to fix it, please let me know.
Thanks.

Since your queries are running for quite a while you might be able to use the V$SQL_PLAN view to spot a difference in the execution plan when this happens.
You need to identify the session in V$SESSION that is currently executing the query and then use the SQL_ID and SQL_CHILD_NUMBER column to identify the SQL being executed.
You can then run a query on V$SQL_PLAN using the obtained SQL_ID and SQL_CHILD_NUMBER (it's called CHILD_NUMBER in V$SQL_PLAN) to capture the execution of the "bad" behaving execution. You can also use the DBMS_XPLAN.DISPLAY_CURSOR('<SQL_ID>', <CHILD_NUMBER>) function to get a nicely formatted output of the execution plan if that function is already available in 10.1 (it is in 10.2).
If you're using Oracle Enterprise Manager you can achieve the same using the available GUI.
Try to compare the captured execution plan to a fast or normal execution in order to find out if there are any significant differences.
One possible explanation could be the usage of bind variables and the effects of bind variable peeking. If your SQL ages out of the shared pool and gets eventually hard parsed again you might be unlucky and perform a hard parse with an unusual bind variable value that leads to an suboptimal execution plan for most of the bind variable values used.
Regards,
Randolf
Oracle related stuff:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle:
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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Hi.
I have a very strange problem with some of my clients. Sometimes they experience a huge delay between key pressed on keyboard and actual character printed on monitor. So there is a simple text item involved and when the user starts typing the delay could be two or even three seconds between user input (each character) and actual forms displaying it.
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Best regards.

Also I am really curious what is happening (is there any network traffic involved) while user is typing text into text item where there is no trigger on that item except when_validate_item.Unless you have implemented a Java Bean on the item to monitor the keystrokes in the field, no events are trigger by the act of typing characters in a field. The act of typing characters in a field occurs completly on the client - no network traffic at this point. Only when a field event occurs (navigation away from the item) will an event occur that would cause network communication between the client and the appilcation server.
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It is tricky to determine where the issues is in the network.
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How to load 5.6 into ML.
1. Download 5.6 for Lion.
http://support.apple.com/kb/DL1482
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http://www.timdoug.com/unpkg/
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For screen shots see this post.
https://discussions.apple.com/thread/4668746?tstart=0
Please describe the actual setup.
Type of broadband, modem make and model.. and particularly is it working as router? Can it work as router if you want to?
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Do not use wireless link for TC to main router.
Then you need to figure out where the issue is..
1. Is it wireless?
Now you need to use ethernet and see if issue is wireless.
You can expect much more problems if you use wireless exclusively.. at least for fixing it you need something ethernet connected. When wireless drops out does ethernet still work?
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Best thing here is to test using another router.. the modem itself if it has router option or borrow another one.
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Mid 2011 Macbook Air Painfully slow.

Mid 2011 Macbook Air Painfully slow.
Hey everyone. I am writing about my 13 inch Mid 2011 Macbook Air.
Recently it has been extremely slow and on occasion has not started up.
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Copy or drag — do not type — the line below into the Terminal window, then press return:
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Post the lines of output (if any) that appear below what you just entered (the text, please, not a screenshot.) You can omit the final line ending in “$”.
Step 2
Repeat with this line:
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Note: If you don’t have a login password, you’ll need to set one before taking this step. If that’s not possible, skip to the next step.
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Important: If you formerly synchronized with a MobileMe account, your me.com email address may appear in the output of the above command. If so, anonymize it before posting.
Step 5
osascript -e 'tell application "System Events" to get name of every login item' 2> /dev/null
Remember, steps 1-5 are all drag-and-drop or copy-and-paste, whichever you prefer — no typing, except your password. Also remember to post the output.
You can then quit Terminal.

Intermitent slowness

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