Oracle 常用字典表查询

查看表结构：
desc表名
查看表名：
select * from all_tables/dba_tables;
查看字段:
select * from user_tab_columns;
select * from user_tables;  
select * from tab/cat ;
查看约束关系:
select * from user_constraints;
查看约束关系字段:
select * from user_cons_columns;
查看对象:
select * from  dba_objects/all_objects/user_objects;
查看触发器:
select * from user_triggers;
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查看索引:
select * from user_indexs;
Oracle查询所有函数和储存过程：
select * from user_source;
 
Oracle查看当前会话：
select * from v$Session;
Oracle查看当前会话权限：
select * from session_privs;
 
Oracle查询所有用户：
select * from all_users;
select * from dba_users;
select * from user_users;
Oracle查看用户权限：
select * from dba_sys_privs;
select * from all_sys_privs;
select * from user_sys_privs;
 
 
 
查看所有角色：
  select * from dba_roles;
查看用户所拥有的角色：
  select * from dba_role_privs;
  select * from user_role_privs;
查看角色所拥有的权限：
  select * from role_sys_privs;
  select * from role_tab_privs;
查看所有系统权限：
  select * from system_privilege_map;
查看所有对象权限：
  select * from table_privilege_map;
 
Oracle查询用户表空间：
select * from user_tablespaces;
select * from dba_tablespaces;
查看用户和默认表空间的关系：   

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select   username,default_tablespace   from   dba_users;
 
Oracle查看用户表空间使用情况：
select a.a1 Tablespace_Name,
       c.c2 type_of_tablespace,
       c.c3 section_of_tablespace,
       b.b2/1024/1024 Size_of_tablespace,
       (b.b2-a.a2)/1024/1024 size_of_used,
       substr((b.b2-a.a2)/b.b2*100,1,5) percent_of_used
from (select tablespace_name a1, sum(nvl(bytes,0)) a2 from dba_free_space group by tablespace_name) a,
     (select tablespace_name b1,sum(bytes) b2 from dba_data_files group by tablespace_name) b,
     (select tablespace_name c1,contents c2,extent_management c3 from dba_tablespaces) c
where a.a1=b.b1 and c.c1=b.b1
order by a.a1
Oracle 用户表空间文件：
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
where tablespace_name = 'USERS'
order by tablespace_name;
 

得到数据库版本

select * from product_component_version;
 
查看系统参数
显示session的参数值
select * from v$parameter2;
显示instance的参数值
select * from v$system_parameter;
select * from v$system_parameter2;
显示spfile的参数值
select * from v$spparameter;