How do I verify whether PostgreSQL is installed correctly?<\/h3>
There are a couple of ways to check whether PostgreSQL is installed. One is by starting the database using the systemctl<\/strong> command:
sudo systemctl start postgresql-17<\/code>
Make sure to replace 17<\/strong> with the actual version you installed. If your command line returns an error about a missing service, it means PostgreSQL isn’t configured properly.
Another method is to log in to the PostgreSQL command line using the following:
sudo -u postgres psql<\/code>
If you see the Command not found <\/strong>error, it means the RDBMS isn’t correctly installed.<\/p> <\/div> How do I access the PostgreSQL command line interface?<\/h3>
To access the PostgreSQL command-line interface, also known as the psql<\/strong> shell, switch to the default postgres <\/strong>account using this command:
sudo su postgres<\/code>
Now, simply enter psql<\/strong>,and your shell should change to PostgreSQL, indicating that you have accessed the command-line interface. To quit the shell, enter the following:
q<\/code>
You can also use a single command in your main shell to enter psql<\/strong> like so:
sudo -u postgres psql<\/code><\/p> <\/div> Why do I encounter issues when installing PostgreSQL?<\/h3>
Several factors can cause issues during the PostgreSQL installation. If you encounter errors when downloading the package, check if your command is correct and uses the right download URL according to your operating system.
Should an issue arise when connecting to the psql <\/strong>shell, check whether the postgresql<\/strong> service is running using this command:
sudo systemctl status postgresql-17<\/code>
If the PostgreSQL status is not running, manually boot it using this command:
sudo systemctl start postgresql-17<\/code><\/p> <\/div> Why can’t I connect to another PostgreSQL role?<\/h3>
If you can’t connect to a new PostgreSQL role, make sure you have created the corresponding user in your LInux system. For example, if you set up the new_user<\/strong> role, your server must also have the same new_user <\/strong>account.
In addition, you must specify the database to connect. If the new user doesn’t have one, use the default postgres <\/strong>database like this command:
sudo -u NewUser psql -d postgres<\/code>
Moreover, try creating the new role using the following statement instead of the interactive mode to grant the login privilege explicitly.
CREATE ROLE my_role WITH LOGIN PASSWORD 'my_password'<\/code><\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"PostgreSQL is an open-source relational database management system (RDBMS) known for its capability to handle large amounts of data, making it a popular choice for large-scale applications. It’s also compatible with various data types, programming languages, web stacks, and operating systems, including popular Linux distributions like CentOS. In this tutorial, we will explain how to […]<\/p>\n
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<\/a><\/figure>![\"Systemctl](\"\/tutorials\/wp-content\/uploads\/sites\/2\/2019\/03\/systemctl-shows-postgresql-service-status-1024x86.png\")