Oracle数据字典常用查询

ORACLE数据字典的常用查询

一、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;

二、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;

给表添加描述
SQL>comment on table 表 is '表注释';

给字段添加描述
SQL>comment on column 表.列 is '列注释';

查看当前用户所有表的描述
SQL>select o.object_name,c.comments
from user_objects o
left outer join user_tab_comments c
on o.object_name=c.table_name
where object_type='TABLE'
/*where instr(o.object_name,'TCO_')>0*/
and c.comments like '%部门%'

查看指定用户所有字段的描述
SQL>select c.table_name,o.column_name,o.data_type,o.data_length,c.comments
from user_tab_columns o
left outer join user_col_comments c
on o.TABLE_NAME=c.table_name
and o.COLUMN_NAME=c.column_name
where o.table_name like upper('OM_ORGANIZATION%') --指定表名

三、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');

四、序列号

查看序列号，last_number是当前值
SQL>select * from user_sequences;

五、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>select 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');

六、同义词

查看同义词的名称
SQL>select * from user_synonyms;

七、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;

八、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');

九、触发器

查看触发器

set long 50000;
set heading off;
set pagesize 2000;

select
'create or replace trigger ' ||
trigger_name || '' || chr(10)||
decode( substr( trigger_type, 1, 1 ),
'A', 'AFTER', 'B', 'BEFORE', 'I', 'INSTEAD OF' ) ||
chr(10) ||
triggering_event || chr(10) ||
'ON ' || table_owner || '.' ||
table_name || '' || chr(10) ||
decode( instr( trigger_type, 'EACH ROW' ), 0, null,
'FOR EACH ROW' ) || chr(10) ,
trigger_body
from user_triggers;