只读光盘 英文名称: 120 mm DVD - Read-Only Disk (Japanese Only) 标准组织: 日本工业标准调查会 正文语种: 国标分类: 【L64】数据媒体 原版报价: ICS分类: 发...
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compact disk read only memory 光盘只读存储器 ; 光驱 ; 只读光盘存储器 ; 只读光盘
compact disk read-only memory 只读光碟
CD-ROM Compact Disk Read-only Memory 只读光碟
compact disk-read-only memory 只读存储器
Digital Video Disk Read-Only Memory 数字视盘存储器
cd-romcompact disk read-only mory 只读光盘
CD-ROM compact disk-read only memory 只读型光盘存储器
You are trying to save the file on a read-only disk.
您试图保存在只读磁盘上的文件。
If all the data fits in the cache, then the data is read from disk only once; after that, all requests are satisfied from the cache at memory speed.
如果所有数据都在缓存中,那么只需从磁盘读取一次数据;毕竟,所有的请求都可以用内存速度从缓存中得到满足。
So at least 653 pages would need to be read from disk if the rows were distributed in such an ideal way that only rows accessed by the query are to be found on the loaded pages.
所以,如果这些行以理想的方式分布,要使得只有被查询访问的行可以在装载的页上找到,那么至少需要从磁盘读653个页。
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