数据字典名称是大写的英文字符。 数据字典里存有用户信息、用户的权限信息、所有数据对象信息、表的约束条件、统计分析数据库的视图等。 我们不能手工修改数据字典里的信息。 一、用户 查看当前用户的缺省表空间 SQLselect username,default_tablespace from user_users; 查看当前用户的角色 SQLselect * from user_role_privs; 查看当前用户的系统权限和表级权限 SQLselect * from user_sys_privs; SQLselect * from user_tab_privs; 二、表 查看用户下所有的表 SQLselect * from user_tables; 查看名称包含log字符的表 SQLselect object_name,object_id from user_objects where instr(object_name,'LOG')0; 查看某表的创建时间 SQLselect object_name,created from user_objects where object_name=upper('&table_name'); 查看某表的大小 SQLselect 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 SQLselect table_name,cache from user_tables where instr(cache,'Y')0; 三、索引 查看索引个数和类别 SQLselect index_name,index_type,table_name from user_indexes order by table_name; 查看索引被索引的字段 SQLselect * from user_ind_columns where index_name=upper('&index_name'); 查看索引的大小 SQLselect 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 SQLselect * from user_sequences; 五、视图 查看视图的名称 SQLselect view_name from user_views; 查看创建视图的select语句 SQLset view_name,text_length from user_views; SQLset long 2000; 说明：可以根据视图的text_length值设定set long 的大小 SQLselect text from user_views where view_name=upper('&view_name'); 六、同义词 查看同义词的名称 SQLselect * from user_synonyms; 七、约束条件 查看某表的约束条件 SQLselect constraint_name, constraint_type,search_condition, r_constraint_name from user_constraints where table_name = upper('&table_name'); SQLselect 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 SQLselect object_name,status from user_objects where object_type='FUNCTION'; SQLselect object_name,status from user_objects where object_type='PROCEDURE'; 查看函数和过程的源代码 SQLselect 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;