ORACLE user management

ORACLE user management
Each ORACLE database has many legal users. These users can log in to the database according to their user name and password, and use SQL language to access data.
(1) Create user
Create user command format Description
create user Username; The operation of creating a user must be done by the DBA. General users do not have the right to create users. Usernames must be unique, i.e. there cannot be two identical users in the same database.
identified by password; Set a password for the user
default tablespace tablespace name; Indicates the default tablespace where the user stores data
temporary tablespace tablespace name; Indicates the default temporary tablespace name used by the user
quota size on tablespace name ; Quota can limit the maximum number of bytes a user can use on a certain table space
Profile resource file; Profile specifies the use of various resources for users
The following is a complete example of creating a user:

 create user  scott；
identified by  tiger；
default tablespace  data_ts；
temporary tablespace  temp_ts；
quota 500K on data_ts；
profile newprofile；

(2) Modify the user
Modifications to users include: password, default table space, temporary table space, table space limit, profile, and default role. Role is a new concept in ORACLE7, we will discuss it in "Permission Management". A role can be thought of here as a special user with certain permissions. Modifying a user's default role is to specify another set of permissions for the user. The following example illustrates the operation of modifying the user:
Task command
Change scott’s password to hello ALTER USER scott IDENTIFIED BY hello;
Change scott’s default tablespace to data2_ts ALTER USER scott DEFAULT TABLESPACE data2_ts;
Change scott’s Modify the temporary table space to temp2_ts ALTER USER scott TEMPORARY TABLESPACE temp2_ts;
Change scott's resource file to otherprofile ALTER USER scott PROFILE otherprofile;
Change scott's default role to DEVELOPER ALTER USER scott DEFAULT ROLE DEVELOPER;
Change all the current system All roles are granted to scott, except Payroll ALTER USER scott DEFAULT ROLE ALL EXCEPT Payroll;
(3) Delete user
The command to delete a user is:

DROP USER 用户名 [CASCADE]；

If you do not use the CASCADE option, all entities of the user must be deleted Only then can the user be deleted. After using CASCADE, no matter how big the user entity is, it will be deleted.

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