正确答案:(正确答案:ISAM是一种专为磁盘存取设计的文件组织形式,采用静态索引结构,对磁盘上的数据文件建立盘组、柱面、磁道三级索引。ISAM文件中记录按关键字顺序存放,插入记录时需移动记录并将同一磁道上最后的一个记录移至溢出区,同时修改磁道索引项,删除记录只需在存储位置作标记,不需移动记录和修改指针。经过多次...
ISAM Indexed Sequential Access Method 索引顺序存取方法 学习了:https://baike.baidu.com/item/ISAM/3013855 是IBM发展起来的文件系统;可以任意或者连续的记录任何访问。
ISAM Indexed Sequential Access Method 索引顺序存取方法 学习了:https://baike.baidu.com/item/ISAM/3013855 是IBM发展起来的文件系统;可以任意或者连续的记录任何访问。
Indexed sequential access methodalso known as ISAM method, is an upgrade to the conventionalsequential file organizationmethod. You can say that it is an advanced version of sequential file organization method. In this method, primary key of the record is stored with an address, this address is ...
What is ISAM (Indexed Sequential Access Method)? ISAM (Indexed Sequential Access Method) is a file management system developed at IBM in the 1960s to access records either sequentially, in the order they were entered or randomly with an index. Each index defines a different ordering of the ...
5) hierarchical indexed sequential access method (HISAM) 层次索引顺序存取方法6) indexes sequential access method ,ISAM 索引顺序存取方法补充资料:顺序存取存储器 存取信息时,只能按存储单元的位置,顺序地一个接一个地进行存取的存储器。最典型的是磁带存储器。 说明:补充资料仅用于学习参考,请勿用于其它...