查看oracle数据库的连接数以及用户
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1、查询oracle的连接数
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select count(*) from v$session;
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2、查询oracle的并发连接数
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select count(*) from v$session where status='ACTIVE';
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3、查看不同用户的连接数
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select username,count(username) from v$session where username is not null group by username;
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4、查看所有用户:
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select * from all_users;
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5、查看用户或角色系统权限(直接赋值给用户或角色的系统权限):
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select * from dba_sys_privs;
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select * from user_sys_privs;
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6、查看角色(只能查看登陆用户拥有的角色)所包含的权限
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select * from role_sys_privs;
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7、查看用户对象权限:
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select * from dba_tab_privs;
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select * from all_tab_privs;
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select * from user_tab_privs;
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8、查看所有角色:
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select * from dba_roles;
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9、查看用户或角色所拥有的角色:
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select * from dba_role_privs;
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select * from user_role_privs;
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10、查看哪些用户有sysdba或sysoper系统权限(查询时需要相应权限)
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select * from V$PWFILE_USERS;
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