用户如何有效地利用Oracle数据字典

核心提示： SQL>select object_name,object_id from user_objectswhere instr(object_name,'LOG')>0;查看某表的创建时间SQL>select object_name,created from

SQL>select object_name,object_id from user_objectswhere 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;

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>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');