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Welcome to DBA Master – Database Tips, Tricks, and Tutorials

Welcome to DBA Master ! This blog is dedicated to all things related to database administration , SQL optimization , and performance tuning . Whether you're a beginner or a seasoned DBA, you'll find practical guides, troubleshooting tips, and real-world tutorials to help you work smarter with data. What to Expect: SQL performance tuning tips Indexing strategies Backup and recovery best practices High availability and replication techniques Database creation, configuration, and setup Monitoring queries and scripts for proactive performance management Migration guides across different database platforms Security essentials and best practices Recommended tools for DBAs Real-world error fixes and how to solve them Stay tuned — exciting content is coming soon. Feel free to bookmark and share: www.dbamaster.com ! Thanks for visiting!
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Permission Commands

groupadd group_name     //create a new group
groupdel group_name     //delete the group
cat /etc/group     //list the group
chgrp group_name file_name     //change the group
usermod -g group_name user_name     //assign the group
chmod u+x file_name     //grant user excute permission
chmod g-r file_name     //revoke group read permission
chmod o+w file_name     //grant other user write permission
umask     //check umash value
chmod 755 file_name     //set rwx rx rx permission
chmod -R 755 file_name     //set rwx rx rx permission with sub directories
chown user_name file_name     //change the file owner
chown -R user_name file_name     //change the file owner with sub directories
chown -R user_name:group_name file_name     //change owner & group with sub directories
chown -R user_name. file_name     //change same name for owner & group with sub directories

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