查看Oracle当前用户下的信息（用户，表视图，索引，表空间，同义词等）

1、用户
　　查看当前用户的缺省表空间

SQL>select username,default_tablespace from user_users;

　　查看当前用户的角色

SQL>select * from user_role_privs;

　　查看当前用户的系统权限和表级权限

SQL>select * from user_sys_privs;SQL>select * from user_tab_privs;

　　显示当前会话所具有的权限　

SQL>select * from session_privs;

　　显示指定用户所具有的系统权限

SQL>select * from dba_sys_privs where grantee='EZXX';

2、表
　　查看用户下所有的表

SQL>select * from user_tables;

　　查看名称包含log字符的表　

SQL>select object_name,object_id from user_objects where instr(object_name,'LOG')>0;

　　查看某表的创建时间　　

SQL>select object_name,created from user_objects where object_name=upper('&table_name');

　　查看某表的大小　

SQL>select sum(bytes)/(1024*1024) as "size(M)" from user_segments where segment_name=upper('&table_name');

　　查看放在ORACLE的内存区里的表

SQL>select table_name,cache from user_tables where instr(cache,'Y')>0;

　　3、索引
　　查看索引个数和类别

SQL>select index_name,index_type,table_name from user_indexes order by table_name;

　　查看索引被索引的字段　

SQL>select * from user_ind_columns where index_name=upper('&index_name');

　　查看索引的大小　　

SQL>select sum(bytes)/(1024*1024) as "size(M)" from user_segments where segment_name=upper('&index_name');

　　4、序列号
　　查看序列号，last_number是当前值

　　SQL>select * from user_sequences;

　　5、视图
　　查看视图的名称　　

SQL>select view_name from user_views;

　　查看创建视图的select语句

SQL>set view_name,text_length from user_views;SQL>set long 2000; 说明：可以根据视图的text_length值设定set long 的大小SQL>select text from user_views where view_name=upper('&view_name');

　　6、同义词
　　查看同义词的名称　　

SQL>select * from user_synonyms;

　　7、约束条件
　　查看某表的约束条件　

SQL>select constraint_name, constraint_type,search_condition, r_constraint_name from user_constraints where table_name = upper('&table_name');SQL>select c.constraint_name,c.constraint_type,cc.column_name from user_constraints c,user_cons_columns cc where c.owner = upper('&table_owner')     and c.table_name = upper('&table_name')　　and c.owner = cc.owner and c.constraint_name = cc.constraint_name　　order by cc.position;

8、存储函数和过程
　　查看函数和过程的状态　　

SQL>select object_name,status from user_objects where object_type='FUNCTION';SQL>select object_name,status from user_objects where object_type='PROCEDURE';

　　查看函数和过程的源代码　

SQL>select text from all_source where owner=user and name=upper('&plsql_name');

9、查看建表语句

SELECT DBMS_METADATA.GET_DDL('TABLE','TABLE_NAME')FROM DUAL; #(表名TABLE_NAME一定要来大写)