1. 查询oracle中所有用户信息
select * from dba_users;
2. 只查询用户和密码
select username,password from dba_users;
3. 查询当前用户信息
select * from dba_ustats;
4. 查询用户可以访问的视图文本
select * from dba_varrays;
5. 查询数据库中所有视图的文本
select * from dba_views;
select distinct tablespace_name from SYS.DBA_FREE_SPACE where tablespace_name like \'%RB%\';
select * from dba_objects where object_name=\'JDE900_F0005\';
select * from rbods.jde900_f0005;
select * from rbodm.dim_company;
查看当前用户的缺省表空间
select username,default_tablespace from user_users
查看当前用户的角色
select * from user_role_privs
查看当前用户的系统权限和表级权限
select * from user_sys_privs
select * from user_tab_privs
查看用户下所有的表
select * from user_tables
显示用户信息(所属表空间)
select default_tablespace,temporary_tablespace from dba_users
显示当前会话所具有的权限
select * from session_privs
显示指定用户所具有的系统权限
select * from dba_sys_privs
显示特权用户
select * from v$pwfile_users
查看名称包含log字符的表
select object_name,object_id from user_objects where instr(object_name,\'log\')>0
查看某表的创建时间
select object_name,created from user_objects where object_name=\'ZW_YINGYEZ\'
查看某表的大小
select sum(bytes)/(1024*1024) tablesize from user_segments
where segment_name=\'ZW_YINGYEZ\'
查看放在ORACLE的内存区里的表
select table_name,cache from user_tables where instr(cache,\'Y\')>0
查看索引个数和类别
select index_name,index_type,table_name from user_indexes order by table_name
查看索引被索引的字段
select * from user_ind_columns where table_name=\'CB_CHAOBIAOSJ201004\'
查看索引的大小
select sum(bytes)/(1024*1024) as indexsize from user_segments
where segment_name=upper(\'AS_MENUINFO\')
查看视图信息
select * from user_views
查看同义词的名称
select * from user_synonyms
查看函数和过程的状态
select object_name,status from user_objects where object_type=\'FUNCTION\'
select object_name,status from user_objects where object_type=\'PROCEDURE\'
查看函数和过程的源代码
select text from all_source where owner=user and name=\'SF_SPLIT_STRING\'
查看表字段
select cname from col where tname=\'ZW_YINGYEZ\'
select column_name from user_tab_columns where table_name=\'ZW_YINGYEZ\'
查看oracle版本命令：
select * from v$version
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