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David Cao

David is a Cloud & DevOps Enthusiast. He has years of experience as a Linux engineer. He had working experience in AMD, EMC. He likes Linux, Python, bash, and more. He is a technical blogger and a Software Engineer. He enjoys sharing his learning and contributing to open-source.

4 ways To Restart Network in Ubuntu

Restoring a dropped connection or applying a new configuration is a routine task for any Linux user. You might find yourself needing to restart the network after a change to your IP address, or perhaps your server has become unreachable…

4 ways to Create an Index in PostgreSQL

Indexes are essential tools for enhancing database performance, allowing the server to locate and retrieve specific rows significantly faster than scanning an entire table. By creating a structured path to your data, PostgreSQL can bypass repetitive row-by-row searches, which is…

how to create user in Postgresql – complete guide

In PostgreSQL, managing users effectively is more than just running a single command—it’s about setting up a secure, scalable hierarchy. Technically, PostgreSQL doesn’t distinguish between a “user” and a “group”; both are referred to as Roles. A User is simply…

3 ways To Change IP Address in Ubuntu

Configuring a stable network identity is a fundamental skill for managing any Linux environment. You might find yourself needing a static IP address to ensure your server remains reachable via SSH after a reboot, or perhaps you are troubleshooting a…

Why Your PostgreSQL Query Isn’t Using an Index

Indexes are the primary tools used to enhance database performance, allowing the server to retrieve specific rows much faster than scanning an entire table. However, simply creating an index does not guarantee that PostgreSQL will use it. Many developers are…