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How do I find which transaction is causing a “Waiting for table metadata lock” state?
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We can use INFORMATION_SCHEMA Tables.
Useful Queries
To check about all the locks transactions are waiting for:
USE INFORMATION_SCHEMA;
SELECT * FROM INNODB_LOCK_WAITS;
A list of blocking transactions:
SELECT *
FROM INNODB_LOCKS
WHERE LOCK_TRX_ID IN (SELECT BLOCKING_TRX_ID FROM INNODB_L...
Make a program run slowly
...er the priority using nice (and/or renice). You can also do it programmatically using nice() system call. This will not slow down the execution speed per se, but will make Linux scheduler allocate less (and possibly shorter) execution time frames, preempt more often, etc. See Process Scheduling (Cha...
Ruby: How to get the first character of a string
...ot that you should be using 1.8 anymore anyway!--but when this answer was posted it was still quite common):
puts 'Smith'[0] # prints 83
Of course, if you're not doing it on a regular basis, then defining the method might be overkill, and you could just do it directly:
puts last_name[0...
Change app language programmatically in Android
Is it possible to change the language of an app programmatically while still using Android resources?
35 Answers
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How to install CocoaPods?
...ase share with me. I read cocoa pods documents and many times tried to install but always failed because of the starting steps. I found one error whereby I can't install gems first. Can anyone give me the steps one by one? How to install or demo.
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Javascript - How to extract filename from a file input control
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vog's answer is really close to the 100% accurate answer to the question (except needs to strip the extension.) A filename is no different from any other string.
– Jon Watte
May 21 '16 at 19:38
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How do you use String.substringWithRange? (or, how do Ranges work in Swift?)
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So what's the right answer here? Calling advance means we have to iterate the whole way through a possibly long string. But forming an NSRange and using NSString explicitly is dangerous? What's left?
– matt
Nov 18 '14 at...
Is there a Java API that can create rich Word documents? [closed]
... OpenOffice.org's Universal Network Objects (UNO) interface to programmatically generate MS-Word compatible documents (*.doc), as well as corresponding PDF documents, from a Java Web application (a Struts/JSP framework).
OpenOffice UNO also lets you build MS-Office-compatible charts, spreadsheets...
What is the difference between Trap and Interrupt?
...mory access. It's also the usual way to invoke a kernel routine (a system call) because those run with a higher priority than user code. Handling is synchronous (so the user code is suspended and continues afterwards). In a sense they are "active" - most of the time, the code expects the trap to hap...
Android - Pulling SQlite database android device
... pro tip: this backup stuff won't work if the app's manifest shows android:allowBackup="false"
– Someone Somewhere
May 27 '14 at 1:23
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