ORACLE查询每个表占用空间大小

SELECT 'select sum(bytes) FROM dba_segments WHERE owner ='|| '"TESTBAR"'||' AND segment_type ='|| '"TABLE"'||' AND segment_name = "'|| table_name||'" ;' from user_tables;
错误的，对于oracle而言，双引号
要用单引号，可用
可以用ASCII码处理，其它特殊字符如&也一样，如
insert into t values('i'||chr(39)||'m'); -- chr(39)代表字符'
或者用两个单引号表示一个
or insert into t values('I''m'); -- 两个''可以表示一个'

SELECT 'select segment_name,sum(bytes) FROM dba_segments WHERE owner ='|| chr(39)||'TESTBAR'||chr(39)||' AND segment_type ='||chr(39)||'TABLE'||chr(39)||' AND segment_name = '|| chr(39)||table_name||chr(39)||';' from user_tables;
注意，对于分区表要采用"TABLE PARTITION"方式

SQL> set linesize 300
SQL> set head off

SQL> spool 1.sql
exec statement
SQL>spool off

处理空行问题：
采用excel的自动筛选进行空行过滤!以及计算空间总和。
实用考虑：
0 产生行一例
select 'SELECT sum(bytes)/1024/1024 Mbytes FROM user_segments WHERE segment_type = '||chr(39)||'TABLE'||chr(39)||' AND segment_name = '||chr(39)||segment_name||chr(39)||';' from user_segments where segment_type='TABLE';
0、查看用户表、索引、分区表占用空间
select segment_name, sum(bytes)/1024/1024 Mbytese from user_segments group by segment_name;
1、表占用空间
select segment_name, sum(bytes)/1024/1024 Mbytese from user_segments where segment_type='TABLE' group by segment_name;
2、索引占用空间select segment_name ,sum(bytes)/1024/1024 from user_segments where segment_type ='INDEX' group by segment_name;
3、分区表TABLE PARTITION占用空间
select segment_name,sum(bytes)/1024/1024 Mbytes from user_segments where segment_type='TABLE PARTITION' group by segment_name;