ORA-60019: Creating initial extent of size string in tablespace of extent
环境：ORACLE11.2.0.3 64BIT 当向一张已经存在的表新建一列时语法如下：alter table xxxx add BASE_INFO2 XMLTYPE 出现ORA-60019错误：ORA-60019: Creating initial extent of size 8 in tablespace of extent size 14
把添加列的语法改为alter table xxxx add BASE_INFO2 XMLTYPE BASE_INFO2 STORE AS CLOB
(TABLESPACE users
STORAGE (INITIAL 1M)); 则能正常添加，但是新建一张表含有XMLTYPE类型的表也能成功，请教下，这个是什么原因呢？