引用 :http://blog.csdn.net/cosio/article/details/3978747 , https://zhidao.baidu.com/question/628524115699308364.html
block 块
extent 区segment 段--增加USERS表空间500M空间
alter tablespace USERS add datafile '/data01/oradata/bidb96/USER_test30.bdf' size 500M;select file_name , tablespace_name, t.* from dba_data_files t where tablespace_name = 'USERS' order by file_id; --每个表占用的空间select segment_name,sum(bytes )/1024/1024/1024 GBfrom user_segments --where segment_name ='TR_GOV_WJ_XNH_D'group by segment_name ; --20190530这天TW层占用的空间select count(distinct segment_name) tb_cnt,sum(bytes)/(1024*1024*1024) GBfrom user_segments twhere partition_name='P_20190530'and segment_name like 'TW%';----查看剩余表空间 汇总
SELECT t1 表空间,z 总表空间,z-s 已用表空间,s 剩余表空间,ROUND((z-s)/z*100,2) "使用率%"From (Select tablespace_name t1,Sum(bytes)/(1024*1024*1024) s From DBA_FREE_SPACE Group by tablespace_name), (Select tablespace_name t2,Sum(bytes)/(1024*1024*1024) z From DBA_DATA_FILES Group by tablespace_name) Where t1=t2; ---表空间总共的空间 select tablespace_name,sum(bytes)/(1024*1024*1024) GB from dba_data_filesgroup by tablespace_name;--表空间剩余空间select tablespace_name,sum(bytes)/(1024*1024*1024) GB from user_free_spacegroup by tablespace_name;--表空间占用的空间 表空间所有对象的物理占用(表,分区,索引等) 这个和DBA_DATA_FILES的大小才一样select tablespace_name,sum(bytes)/(1024*1024*1024) GB from user_segmentsgroup by tablespace_name;----表实际使用大小 这个大小相加必定<DBA_DATA_FILES的大小,因为只有表 , 这个貌似没有及时更新
select table_name,(num_rows * avg_row_len )/(1024*1024*1024) 该表大小GBfrom user_tables where table_name = '表名大写'--672699条数据 0.306965947151184GBorder by 2 desc