Container - Id is shown as 2000

I installed Oracle Container using the image: oracleinanutshell/oracle-xe-11g:latest - on a Linux machine. While doing, I copied one .sql file into /docker-entrypoint-initdb.d using "volumes" as shown below: volumes: - ./sql:/docker-entrypoint-initdb.d After the container was created, when logged into container, the Owner for the folder "docker-entrypoint-initdb.d" is shown as "2000". When verified for user with the ID, nothing is shown. Any suggestion about who is the user with ID as 2000? And what is the reason for this - Thanks for the help!