讲解Oracle数据库中的数据字典及相关SQL查询用法

SQL>select username,default_tablespace from user_users;

SQL>select * from user_role_privs;

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

SQL>select * from user_tables;

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

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

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

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

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

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

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

SQL>select * from user_sequences;

SQL>select view_name from user_views;

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');

SQL>select * from user_synonyms;

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;

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

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