Oracle一些常用的查询命令总结（持续更新）

-------------------------表空间 ---------------------------------------
----- 查看Oracle当前用户下的信息（用户，表视图，索引，表空间，同义词，存储过程函数，约束条件） 0 、表空间
select username,default_tablespace from user_users;
-----查看当前用户每个表占用空间的大小
Select Segment_Name,Sum(bytes)/1024/1024 CNT_MB  From User_Extents Group By Segment_Name order by CNT_MB asc;
-----查看表空间的使用率
select tablespace_name,sum(bytes)/1024/1024 CNT_MB from dba_segments group by tablespace_name ORDER BY CNT_MB ASC;
----查看表空间的存储路径
select t.* from dba_data_files  t;
----查看部门表空间的存储信息
select t.tablespace_name,t.file_name,t.status from dba_data_files  t;
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------------------------------查看用户角色 ----------------------------------
---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;
---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 where grantee='DBA';
---查看用户下所有的表
select * from user_tables;
---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=upper('&table_name');
---查看某表的大小
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
select table_name,cache from user_tables where instr(cache,'Y')>0;
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------------------------------查看索引 -------------------------------------
---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 --SYS_C0012355
select * from user_ind_columns where index_name=upper('&index_name');
---查看索引的大小 -- SYS_C0012355
select sum(bytes)/(1024*1024) as "size(M)" from user_segments where segment_name=upper('&index_name');
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------------------------------查看序列号 和视图 等等 ------------------------
---查看序列号，last_number是当前值
select * from user_sequences;
---查看视图的名称
select view_name from user_views;
---查看创建视图的select语句
/*set view_name,text_length from user_views;
set long 2000; 说明：可以根据视图的text_length值设定set long 的大小*/
select text from user_views where view_name=upper('&view_name');
---查看同义词的名称
select * from user_synonyms;
select * from all_sysnonyms;
---查看某表的约束条件 --APPLICATION_PROJECTS
select constraint_name, constraint_type,search_condition, r_constraint_name   from user_constraints where table_name = upper('&table_name');
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;
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------------------------------查看存储函数和过程  ------------------------
---存储函数和过程
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  --PROC_VER2HOR
select text from all_source where owner=user and name=upper('&plsql_name');
select name from v$datafile;
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------------------------------查看存储函数和过程  ------------------------
select * from v$logfile;
select * from v$sqlarea