How to reproduce “resource busy and acquire with NOWAIT specified or timeout expired ” error on local machine in oracle

I am running oracle database and I am getting error as "resource busy and acquire with NOWAIT specified or timeout expired " and because of this error i am getting some other exceptions. on my local machine I am not getting this "resource busy …" error. basically I want to reproduce this error on my local machine . is there any way to reproduce this error manually on my local machine?

How can a CPU be busy during DMA access with burst mode transfer

During burst mode in a DMA access, the DMAC has control over the bus for the whole transfer session which includes DATA PREPARATION time as well as DATA transfer time, after the transfer is over, the DMA relinquish the system bus. So in the mean time, the cpu can neither fetch any instruction from the MAIN MEMORY, nor it can fetch any operand, it can atmost complete the instruction it was executing before if that don’t include the use of system bus. In the book I have seen as cpu busy percent is given by

Data preparation time/(data prep time + data transfer time) How can the cpu be busy during the data preparation time when the bus is not with it. This can be the concept behind CYCLE STEAL mode, since it gains the bus only during data transfer, but how during burst mode??

What is the difference between available expressions analysis and very busy expressions analysis?

I am having trouble understanding the conceptual meaning of the two kinds of analysis. I know the equations and how to solve the problems and I know how one is a forward data-flow analysis while the other is a backwards data-flow analysis, but there is still something missing in the explanations I have seen so far, in a higher level.

Can a second-order busy beaver function/turing machine be programmed?

I have seen a computer program at that computes Busy Beaver numbers (well, pretends to). It has busy beaver numbers up to 4, and I am wondering if it is possible (reasonably) for a programmer to add a second-order, n-state, 2-symbol Turing machine.

Can I cast Sunbeam if both my hands are busy?

The 6th-level Evocation spell Sunbeam reads as follows:

A beam of brilliant light flashes out from your hand in a 5-foot-wide, 60-foot-long line. […] For the duration, a mote of brilliant radiance shines in your hand.

Bearing in mind that you need to have at least one hand busy with the Material/Somatic component of the spell (as remarked by NautArch in the comments), the text doesn’t directly say “you need an extra free hand to cast this spell”, but the wording makes it seem so. I need some clarifications.

  • Can I cast Sunbeam if both my hands are busy, even if one is holding the Material component?
  • Otherwise, do I need to hold the Material component (or focus) in one hand while keeping the other one free?
  • How does the casting of Sunbeam interact with the War Caster feat?

Trigger to insert new row into second table causes “Connection is busy with results for another command”

I have created this trigger to insert new row into table @AL_ORDR_TRACKER after new row is inserted in table ORDR.

CREATE TRIGGER dbo.trgAfterInsertORDR ON dbo.ORDR AFTER INSERT AS BEGIN INSERT INTO dbo."@AL_ORDR_TRACKER"         (U_DocEntry, U_Updated)     SELECT         DocEntry as U_DocEntry, GETDATE() U_Updated         FROM inserted END 

The trigger gets registered but when inserting new rows into ORDR I get the error message:

Connection is busy with results fro another commands

What might be going wrong here?

camera stays busy after stopping code

I installed spyder2.X. with Ubuntu 16.04, gave me this message:

Spyder crashed during last session.          ........         ....... 

then, installed it by:

sudo pip install -U spyder 

this commend installed spyder3

the problem:

when running the code from spyder, the camera stays busy after stopping running.

when running the code from the terminal, everything is ok.

I read more about this problem, one comment is very hard “Closing because this is a Debian/Ubuntu problem because they decided to intentionally break Spyder.”

Also, this enter link description here change OpenCV version but my case is different. my case with spyder, not OpenCV.

the summary:

I can’t use an anaconda library and python3 because of some confliction with ROS library.

please help me or any suggestion

Thank you in advance!

SharePoint Site Error: Server is too busy

Recently, I ran in to a problem, where a document that is stored in a SharePoint site was published through social media, the document URL was something like this:


After publishing the document, an error appeared when trying to access the site saying “Server is too busy, try again later” (site was down).

I’ve been administrating the farm that hosts this SharePoint site for more than 2 years, I was never given such an error as the topology contains 6 web front ends with very high specifications in terms of CPU, RAM, and Disk Space.

I investigated almost everything on the server and servers’ resources seem to be healthy (Disk Space, RAM, CPU, Services up and running)…etc.

Operation team said that they noticed a heavy traffic coming from outside the country and they blocked the IP that was causing the traffic to the site, also after restarting the servers one by one, everything was back to normal.

I’m wondering what the issue is, is it because the document was announced on Social Media and huge number of people tried to download the document through the announced URL ?! or was the site exposed to some kind of a DDoS attack ?

Your advice is appreciated.

when to use “wait” and when “busy” mouse cursor

I am developing a desktop application with Qt framework. When there is a task running which causes the UI to be blocked for a while, I would like to use a mouse cursor indicating that the user should wait until the task is finished. There are two cursors available – “wait” cursor and “busy” cursor. What is the difference from the UX perspective. What are the rules when to use one or the other?

enter image description here