If the DBA who created the user didn't specify one, the default tablespace is SYSTEM (not good!).
As far as authentication goes, there isn't a default. The way a user logs on/authenticates is based on the selection of the DBA when creating the user. A user will either be IDENTIFIED:
- BY password - The BY password clause lets you creates a local user and indicates that the user must specify password to log on.
- EXTERNALLY - Specify EXTERNALLY to create an external user. Such a user must be authenticated by an external service (such as an operating system or a third-party service).
- GLOBALLY - The GLOBALLY clause lets you create a global user. Such a user must be authenticated by the enterprise directory service.
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This was first published in January 2003