A collation is an SQL schema object that maps an SQL name to operating system locales. A collation specifies the bit patterns that represent each character in a dataset and determine the rules used to sort and compare data. Collation attributes can have an impact on query results because they govern how sorting and comparison operations function.
To find the collation of the database, you need to query pg_database : select datname, datcollate from pg_database;
Recently I have updated my OS version from Ubunutu 20 to Ubuntu 22. After that whenever I tried to create a database in my Postgresql, it throws error. Below is the error shown: