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Below are the steps to Follow if the Unified Auditing is enabled on DB. If the Unified_Auditing is Enabled to log into Linux Syslog then you need to follow NXLog Community Edition.
Read Only User CreationOracle 21c onwards
To Enable Read Only User
To start SQLPlus without logging in to a database, at a command prompt, type the following:
sqlplus /nolog;
To connect as a system database administrator, at the SQLPlus prompt, type the following command:
connect sys/password@SID as sysdba;
To create a read-only user, at the SQLPlus prompt, type the following commands:
create user read_only_user
identified by password;grant connect to read_only_user;
To grant select privileges for the database user, type the following commands:
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