Windows XP Service pack 2 introduced some new security measures in an attempt to prevent the use of overwritten heap headers to do arbitrary byte writing. This method of exploiting heap overflows, and the protection offered by service pack 2, is wid
从Oracle8i开始，Oracle开始在tablespace内部将对象管理进行自动化。表格空间增强了自动分段空间管理（ASSM），ASSM的tablespace是通过将SEGMENT SPACE MANAGEMENT AUTO子句添加到tablespace的定义句法里而实现的。通过使用位图freelist取代传统单向的链接列表freelist，ASSM的tablespace会将freelist的管理自动化，并取消为独立的表格和索引指定PCTUSED、FREELISTS和FREELIST GRO
