第九章：Managing users （用户管理）
1.create a user: database authentication
sql> create user juncky identified by oracle default tablespace users temporary tablespace temp quota 10m/unlimited on data password expire [account lock|unlock] [profile profilename|default];
2.change user quota on tablespace
sql> alter user juncky quota 0 on users;
3.drop a user
sql> drop user juncky [cascade];
4. monitor user
view: dba_users , dba_ts_quotas
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