Netstat - I have been researching info on a utility called netstat. There is surprisingly not much said about it, other than the multiple options that it support. N...
Roles and Privileges
When you drop an object, any privileges on the object that have been granted to roles disappear automatically. You can grant multiple privileges at once if you separate the privileges by commas. You remove privileges by REVOKE FROM. You can remove all privileges with REMOVE ALL PRIVILEGES or simply REVOKE ALL.
PUBLIC is an Oracle account that represents all users. You can grant privileges to PUBLIC. Then all users get that access. If you own an object, you do not need explicit privileges to access it. You get them by default. All grants operate immediately without the need for a COMMIT.
There are a slew of data dictionary views to look at privileges. USER_SYS_PRIVS contains those system privileges related to the user. DBA_SYS_PRIVS has all system privileges.
USER_TAB_PRIVS contains those privileges where you own the object, granted the privilege, or are a grantee of the privilege. ALL_TAB_PRIVS adds privileges through a role or that are granted to PUBLIC and available to you. DBA_TAB_PRIVS has everything.
ALL_TAB_PRIVS_RECD are privileges you have directly, through a role, or that are PUBLIC. There is a SESSION_PRIVS view that I am not too familiar with yet.
There are some old Oracle defined roles that are being phased out. But I think you still need to know them. CONNECT gives you CREATE SESSION. It is for a general user. RESOURCE is a role for application developers. DBA is a role for administrators.
Roles can be granted to roles. There are a number of data dictionary views associated with roles. ROLE_ROLE_PRIVS are the roles that have been granted other roles. ROLE_SYS_PRIVS are system privileges assigned to roles. ROLE_TAV_PRIVS are object privileges granted to roles.
Here is a trivia fact: there are no privileges specifically for indexes. You get the ability to create an index when you have the CREATE TABLE privilege.