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When does System.gc() do something?

I know that garbage collection is automated in Java. But I understood that if you call System.gc() in your code that the JVM may or may not decide to perform garbage collection at that point. How does this work precisely? On what basis/parameters exactly does the JVM decide to do (or not do) a GC ...
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Check if a temporary table exists and delete if it exists before creating a temporary table

I am using the following code to check if the temporary table exists and drop the table if it exists before creating again. It works fine as long as I don't change the columns. If I add a column later, it will give an error saying "invalid column". Please let me know what I am doing wrong. ...
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How do I improve ASP.NET MVC application performance?

How do you improve your ASP.NET MVC application performance? 19 Answers 19 ...
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How to show a GUI message box from a bash script in linux?

I'm writing a few little bash scripts under Ubuntu linux. I want to be able to run them from the GUI without needing a terminal window to enter any input or view any output. ...
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Import package.* vs import package.SpecificType [duplicate]

Would it suppose any difference regarding overhead to write an import loading all the types within one package ( import java.* ); than just a specific type (i.e. import java.lang.ClassLoader )? Would the second one be a more advisable way to use than the other one? ...
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How to automatically reload a page after a given period of inactivity

How can I automatically reload a webpage, if there have been no activity on the page for a given period of time? 14 Answers...
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How can we run a test method with multiple parameters in MSTest?

NUnit has a feature called Values, like below: 9 Answers 9 ...
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How to let PHP to create subdomain automatically for each user?

How do I create subdomain like http://user.mywebsite.com ? Do i have to access htaccess somehow? Is it actually simply possible to create it via pure php code or I need to use some external script-server side language? ...
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How can I remove a character from a string using Javascript?

I am so close to getting this, but it just isn't right. All I would like to do is remove the character r from a string. The problem is, there is more than one instance of r in the string. However, it is always the character at index 4 (so the 5th character). ...
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Shortcuts in Objective-C to concatenate NSStrings

Are there any shortcuts to ( stringByAppendingString: ) string concatenation in Objective-C, or shortcuts for working with NSString in general? ...