Prevent Jobs Running Twice at the same time
Hi all, I would like to know if they are any ways to prevent a release job to run twice at the same time. For exemple, if I create a job to run every 5 minutes and the job did not finish after 5 minutes, the scheduler will start the same job agains. This situation causing us bad issues.
I double check the job start conditions in sm37 but I found nothing special.
Thanks for help
Hi Marc,
We use a workaround. We have asked our abap developpers to write a small utility report which checks if the job it is part of is already running and aborts the job if it is the case.
When we need a job which must absolutely run only once at the same time, we just add this utility as first step.
Regards,
Olivier
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</html>memaat wrote:
Jon, did Adobe anticipate swf problems on mobile devices? What do you recommend so I can keep my swf’s working ? I am grateful for all your help.
Steve Jobs did, and summed it up nicely a few years back...
Thoughts on Flash
There's nothing you can do but switch away from Flash and move on to CSS and Javascript for animation and HTML5 for the <video> tag, if you want the broadest audience to see your content. -
Maximum number of client that possible to running OSD at the same time?
How maximum number of client that possible to perform OS deployment from SCCM 2012 R2 at the same time?
Regards, Bar WaelahIt depends on your infrastructure and design.
My DP servers got mirrored mechanical disks and a Gbit nic. We like to run about 10 clients every 2 hours from them. That is enough time to apply our custom image, apply any extra appps and patches.
Since we got one of those servers on about 100 locations it means that in the best case I can deploy about 1000 systems every two hours.
That's my technical limit BUT that's not the real limit.
More important is how many users with newly installed systems can your organization handle. There will always be some machines that fails and needs to be fixed (how many non productive users can you have at the same time?). Some users will call hellpdesk
regardless of instructions, onscreen information, user training and so on. How many calls can your helpdesk handle? There will be requests for extra apps, changed screen resolution, left handed mice settings and so on, maybe printer configs? Same thing here
- how many of these cases can your support handle?
Those are the "soft" limiting factors and so far (been doing this for about 15 years now) the "soft" limits have always been lower than the technical limit -
Multiple running queries at the same time
Hi!
I looked around (and RTM) for this but didn't find anything, so I'm asking here.
I have quite a few long running queries (data loading and such things, warehousing stuff), and I need to be able to run multiple queries/statements at the same time. In TOAD I can do this, start a procedure and while it is running I can do SQL statements in another session tab (it supports threaded sessions - it starts queries in their own background thread/session).
When I start a long running procedure or query in SQL Developer I can not do anything until the procedure execution finishes. Is there any way (setting/preference) to enable SQL Developer to be able to run multiple queries at the same time?
I really would like to move away from TOAD, but this is a major showstopper for me.
Thanx for any tips.
AlexHi!
This post is going to be a little longer, but I have to clarify things out.
I did not mean to throw any wild accusations, because I did my fair share of RTFM and searching the help. I can tell you that if you put any of these in the help search box:
session
non shared
non-shared
connection
concurrent <- I guess this one should yeld something
multiple
spawn
you won't find anything usefull, the article that comes closest, is this:
"Sharing of Connections
By default, each connection in SQL Developer is shared when possible. For example, if you open a table in the Connections navigator and two SQL Worksheets using the same connection, all three panes use one shared connection to the database. In this example, a commit operation in one SQL Worksheet commits across all three panes. If you want a dedicated session, you must duplicate your connection and give it another name. Sessions are shared by name, not connection information, so this new connection will be kept separate from the original."
It does not mention any spawning of non-shared connections from the current one, nor it does mention using a accelerator key combo. But since there could be written something about it, I guess you could call it a documentation bug, because it does not provide any clue to this functionality. The help is definitely of no help in this case. As you can see, I do not throw accusations without trying to find out something first. I guess if someone is not as deep into SQL Developer as you are, there is no way for him/her to know this.
OK, I tried your suggestion, and (sadly) it does not work as I suppose it should.
Here's what I did:
- start a new connection, and enter the following code in SQL Worksheet:
declare
j number;
begin
for i in 1..1000000
LOOP
j := sin(i);
end LOOP;
end;
As you can see, it doesn't do much besides holding the connection busy for a while when executed.
- start a new non-shared connection from the first one using CTRL-SHIFT-N (as you suggested) and put the following statement in the new SQL Worksheet (with "__1" appended to connection name)
select sysdate from dual;
- go to the first SQL Worksheet and execute the procedure
- while the procedure is executing, go to the second SQL Worksheet and hit F9.
The sysdate is returned as soon as the first SQL Worksheet finishes and not any sooner. It may run in separate session, but the result is not returned before the other session is finished doing what it is doing. I guess the correct behaviour would be to return the sysdate immediately.
I verified this behaviour repeating it 3 times starting with a new instance of SQL Developer, each time connecting to another schema and spawning the new non-shared session. The database used was Oracle 10.2.0.3 EE on RHEL 4 UPD3.
The concurrent execution lacks concurrency. The statements might be executed concurently on the database (i did not went the extra mile to verfiy this), but the returning of results is just not independent of other sessions. To the end user this is as much concurrent as it is serial execution.
I hope developers get this issue straightened out soon, as I said, I'd love to move away from Toad, but I'll have to wait until they fix this out.
Is there anything else that can be done to make it behave correctly?
Kind regards
Alex -
Use a capture device twice at the same time?
I have write a application using JMF. But I have a big question that how can I use a capture device several times at the same time????
For example:
I create a player to play video from my webcam on my PC ,and then I want to send the video stream from my webcam to another PC at the same time. But I failed--only one task can work.
For example:
1, I write a class Player and another class RTPTransmit. Then I send the same medialocator to two of them. Then there will be a exception said that capture device is in use. And only one task can work.
2, I write a class Player and another class RTPTransmit. Then I use :
dataSource1 = Manager.createDataSource( locator );
dataSource2 = Manager.createCloneableDataSource( dataSource1 );
then I send dataSource1 to Player object to play video on local PC and send dataSource2 to RTPTransmit to send video to another PC. But only one task will work too.
My question is that how can I use a capture device several times at the same time???
I have tried several ways and sill can not find a method. If anyone know how to do,could you tell me please? Thank you very much.Yes ,I use Manager.createCloneableDataSource() method to create the clone of the datasource ,but it can not work too. The java doc illustration is :
Creates a cloneable DataSource. The returned DataSource implements the SourceCloneable interface and enables the creation of clones by the createClone method.
If the input DataSource implements SourceCloneable, it will be returned right away as the result. Otherwise, a "proxy" DataSource is created. It implements the SourceCloneable interface and can be used to generate other clones.
When createCloneableDataSource is called on a DataSource, the returned DataSource should be used in place of the original DataSource. Any attempt to use the original DataSource may generate unpredictable results.
It means that if I clone a datasoure from original datasource, then the createCloneableDataSource() method will return a datasuouce implements interface SourceCloneable, right ? I see that the intereface SourceCloneable has a abstract method createClone() , but when I use createCloneableDataSource() to get a source clone, I find that I can not use method createClone(), why??? For example: data1 is the
orginal datasource. Then:
DataSource data1 = Manager.createDateSource( locator );
DataSource data2 = Manager.createCloneableDataSource( data1 );
now data2 is the "proxy" datasource which implemnets the interface, right? But I can not use data2.cloneClone() ,why? Then I write the fllowing code:
DataSource data3 = Mangaer.createCloneableDataSource( data2 );
DataSource data4 = Manager.createCloneableDataSource( data2 );
playOnLocalPc = new PlayOnLocalPc( data3 );
playOnLocalPc.start();
rtpTransmit = new RTPTransmit( data4 );
rtpTransmit.start();
PlayOnLocalPc and RTPTransmit is my own class to play or transmit video stream. But they can not work at the same time. If I play video from webcam on local PC and then start to transmit stream to other PC , the play window will become black. Why?????It is too strange. Dose anyone know the reason ,please tell me, thank you very much. Giving some example code will be better:) Thank you again! -
Make 2 methods run at exactly the same time
Hi,
How can I make 2 mothds be executed at exactly the same time? Is it anything to do with the synchronized keywor?
Thanks.You can't really.
Even in the case of two computers, you probably don't have control over how the OS will give Java CPU cycles, so even though you thing you're clicking at the same time, the methods may start at slightly different times.
Similarly , on a multi-CPU machine, you don't generally control how threads are apportioned among the CPUs, or when they get time.
How exact does "exactly" need to be? +/- 1 μs? +/- 1 ms? 100 ms?
Why do you need this?
Why do you think you need this? There may be another ay to acommplish your ultimate goal without needing two methods to start simultaneously, or close to it. -
Movie downloaded twice at the same time
I purchased one movie and it is downloading two at the same time, the same movie...how can this happen? I thought iTunes store ask you if you want to purchase the movie, specially if you are downloading the same???????
Was it an HD movie?
If so, all Hd movies come with the sd version so you can watch on an iphone/ipod. -
Two macs running garageband at the same time
Hi. I am using GarageBand on two Mac's at the same time and would like to know how I can record both parts of the tracks, I guess I'll have to use an external recording device of some sort but I do not know which or how I would set this up. Basically, I am playing a part of the song on one Mac and the other part on the other Mac and would like the two Mac's to be liked up to a seperate recording system so I can record the mix, hopw someone can help, thanks.
The biggest problem you are going to have is sync. There is no way to keep these two computers in sync unless you hook up some kind of KVM USB splitter for your keyboard. Both machines would need to be identical in setup or this will not work. Playback and record buttons need to be pressed at the exact same time. The mouse can be used to trigger events (such as record enable) to each computer. It is not a very elegant or pragmatic way of gaining more tracks.
The better way is to use a dual G5 with a big monitor. -
Black and unresponsive iPhone screen (vibrates twice at the same time)
Hi, I dropped my iphone on the ground and after I had picked it up the screen turned black and it started to vibrate when I plugged it in the charger. The phone was hot and would not cool down.
I have tried to hold the home button and the on/off button at the same time but it does not work. Please if anyone can help me and tell me what to do, I would appreciate it.You physically damaged the phone when it was dropped. The only solution is relpacement or repair. Take it to Appel or an Apple authorized service provider.
-
How to make a job run hourly at the same interval?
We have a requirement to launch a job at 10 minutes past every hour.
The job averages anywhere from a few seconds to 55 minutes.
On every other job scheduler that I've used, this would be a no-brainer...I would simply select the option to "reschedule from the last time the job started", and move on.
Tidal, however, does not offer that option....one can only "reschedule from the last time the job finished".
Does anyone else have a similar requirement?
If so, how do you handle this?When you select the "Rerun same occurrence" option on the Schedule tab you get the behavior you indicated. If you select the "Run new occurrence" option you will get the behavior you seek.
The question I always ask when setting up a repeating job is does the job need to always repeat at a specific interval or not.
I admit this solution means you have multiple instances of the job in the schedule, which I don't care for because it adds to the items displayed. I never allow a job or group with "Run new occurrence" to be at the top level for this reason.
Thanks.
Tracy
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