PostgreSQL is a well-known open source relational database. It aims to manage data without a size limit and protects it by providing a fault-tolerant environment. It provides numerous features that make it one of the most powerful database managers.
The first step is to
create a database.
CREATE DATABASE testname;
create command creates a database with a name, which is referred to here as testname.
CREATE DATABASE db_name OWNER = owner_name TEMPLATE = template_name ENCODING = encoding_type LC_COLLATE = lccollate LC_CTYPE = lcctype TABLESPACE = tablespace_name CONNECTION LIMIT = max_connection_limit
name: This specifies the name of the database that needs to be created.
owner: This specifies the user that owns the database.
template: This specifies the type of template you are using for your database.
encoding: This specifies the type of character set encoding you are using for your database.
lc_collate: This specifies the order in which the strings of your database are going to be sorted.
lc_ctype: This specifies the way you are going to classify the characters in your database.
tablespace: This specifies the name of the tablespace that you are going to use in your database.
connection limit: This specifies the maximum number of connections you can have concurrently in your database.
If the output has no response, it means that your database has been created successfully. But, there can be a scenario where you get an output such as:
command not found
If this happens, it can either mean that your
PostgreSQL was not installed properly, in which case you can re-install, or the correct path was not set in the shell script. You can then try creating a database by providing an absolute path, such as:
$ /c/user/programs/postgresql/bin/createdb mydb
Note that the above mentioned path is just an example, and the path at your machine will be different. You can check the installation instructions to find out the absolute path.
You can also come across another output related to the server such as:
file not found
no such file or directory
could not connect to server
Again, you need to thoroughly read the installation guide and see whether you are following all the steps that start the server. You can also check if there is any missing file that needs to be installed.
Another thing is to make sure that you are creating a database through an account that has permissions to create the database. If you are unsure if you have those rights, you can consult the administrator and ensure your creating rights privilege. Otherwise, the following error may occur:
permission denied to create database
Now, after successfully creating a database and manipulating it according to your requirements, you might want to drop it. Here is the command for dropping the database:
DROP DATABASE testname
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