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。
The primary server has write access to a disk or disk array, while all SDS servers have read-only access.
主服务器拥有对一个磁盘或磁盘阵列的写访问权，而所有SDS服务器则仅拥有只读访问权。
The transaction log is stored as a sequential disk file (or sometimes in a raw partition) and will generally only be written to, not read from, except in the case of rollback or recovery.
事务日志存储为连续的磁盘文件(有时存储在原始分区中)，并且一般只是用于写入而不用于读取，回滚或恢复的情况例外。
RAID-Z traverses the available metadata to read only the data that's relevant for the geometry and avoids reading the unused space on the disk.
RAID - Z遍历可用的元数据以便只读取有关几何学的数据并避免读取磁盘上未使用的空间。
An individual workstation acquires read-only NFS-mounted working disk space during boot-up.
每个工作站在引导过程中将获取只读的使用nfs加载的工作磁盘空间。
Ensure that the file is not marked read-only and that your computer has enough free memory and disk space.
确保文件未标记为只读，并且计算机有足够的可用内存和磁盘空间。
It to an icon to display the current hard disk read-write state, the user can also set to monitor only one logical partition a hard disk or read and write state.
它能以一个图标来显示当前硬盘读写状态，使用者也可以设置只监视某个硬盘或某个逻辑分区的读写状态。
It to an icon to display the current hard disk read-write state, the user can also set to monitor only one logical partition a hard disk or read and write state.
它能以一个图标来显示当前硬盘读写状态，使用者也可以设置只监视某个硬盘或某个逻辑分区的读写状态。
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