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How to List Active Connections in PostgreSQL

Sometimes you may need to get open connections or check active connections in PostgreSQL. Here is how to list active connections in PostgreSQL.

Swap space is used as memory in operating system. Here is how to create swap space in Ubuntu/Debian.

Sometimes you may need to repair MySQL databases & tables as they grow. Here is how to repair MySQL databases & tables.

Sometimes you may need to optimize MySQL tables to improve query speed and performance. Here is how to optimize MySQL tables.

Sometimes you may need to run cURL command for REST APIs. Here is the cURL command to call REST API.

Sometimes you may need to remove WWW from URL on your website. Here are the steps to remove www from URL in Apache.

Sometimes you may need to delete git tags. Here are the steps to remove git tags from repository.

Sometimes you may need to drop one or more columns in Python Pandas. Here are the steps to do it.

It is good to learn about how to perform testing in python. Here are the types of testing in Python.