The disk access
time is the time to transfer all blocks of the fragment from disk to buffer and is computed as (time to transfer a block of records) x (transaction frequency) x (cardinality) x (fragment length).
the assumption that a random disk access
will be required for each record identifier for each term, as if inverted lists were stored as a linked list on disk (They should be stored contiguously or at the very least in a linked list of blocks.
Running Speed Disk keeps the hard disk access
time from slowing down by correcting the file fragmentation that occurs with use.
DOS keeps track of where everything is located, but one result is to slow disk access
Ideally, he says, laptop software should only require disk access
when the program loads or when the user saves data.
Then the time elapsed for each activity such as processing, disk access
CACHING AND OTHER DISK ACCESS
AVOIDANCE TECHNIQUES ON PERSONAL COMPUTERS Disk caching is a technique for keeping the most recently used disk blocks in an associative memory in main storage, with the expectation that those blocks will be used again in the near future.
Dual-ported disk drives connect to two of the nodes, providing a secondary redundant disk access
path in case one node fails.
Such an index aims to minimise its memory footprint and CPU usage, whereas a disk-resident index focuses on reducing its disk access
, since disks offer a slow medium for data access.
1 GB Hard disk access
time 16 ms CD-ROM transfer rate 8x (1.
The bad news is that I lost the ability to use SmartDrive, the data-caching Microsoft program that speeds up disk access