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Efficient SQL test query or validation query that will work across all (or most) databases
Many database connection pooling libraries provide the ability to test their SQL connections for idleness. For example, the JDBC pooling library c3p0 has a property called preferredTestQuery , which gets executed on the connection at configured intervals. Similarly, Apache Commons DBCP has valid...
counting number of directories in a specific directory
How to count the number of folders in a specific directory. I am using the following command, but it always provides an extra one.
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Is there a timeout for idle PostgreSQL connections?
I see a lot of them. We are trying to fix our connection leak. But meanwhile, we want to set a timeout for these idle connections, maybe max to 5 minute.
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List of ANSI color escape sequences
On most terminals it is possible to colorize output using the \033 ANSI escape sequence.
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“:” (colon) in C struct - what does it mean? [duplicate]
What does :1 and :8 mean?
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What is an SSTable?
In BigTable/GFS and Cassandra terminology, what is the definition of a SSTable?
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How do I sort strings alphabetically while accounting for value when a string is numeric?
I'm trying to sort an array of numbers that are strings and I'd like them to sort numerically.
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How can I fill a div with an image while keeping it proportional?
I found this thread — How do you stretch an image to fill a <div> while keeping the image's aspect-ratio? — that is not entirely the thing that I want.
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How to send email from Terminal?
I know there are ways to send email from terminal in Linux/MacOS, but I can't seem to find proper documentation on how to do that.
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How to serialize a lambda?
How can I elegantly serialize a lambda?
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