| 术语 | change bit |
| 释义 | change bit 变更位;［变更数元］ A bit (in a descriptor) that is set to “1” whenever a change access (write; append; delete) is made to a page or segment in primary storage. When the page／segment is selected for discard, the bit is checked; if it is “0”, no change has been made and the page／segment can be overwritten because there is an exact copy in secondary storage. If the bit is“1”, the page／segment is rolled out to backing storage to overwrite the unc hanged version. 描述符中的一位。每当对主存储器中的一页或一段作了更改,如写入、添加、删除等时,该位 置“1”。当要废弃一页或一段时,先检查这位;如果该位是“0”,则表示没有更改过,可在这页或段上写入,这是因为在辅助存储器中 有一个完全相同的副本。如果这位是“1”,则把这页或段复制到辅助存储器,以修改其中未经更改的版本。 |
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