One of the paper titled “Rules of Thumb in Data Engineering” (Jim Gray et. el.) mentions some calculations based on Amdahl’s balanced system law. Link to paper: https://www.microsoft.com/en-us/research/wp-content/uploads/2016/02/ms_tr_99_100_rules_of_thumb_in_data_engineering.pdf Initially, the paper provides some rules of thumb. “10. Amdahl’s revised balanced system law: A system needs 8 MIPS/MBpsIO, but the instruction rate and IO rate must … Read more
I’m curious about what do we need volume as an abstraction on top of hardware partition? What problem it tries to solve? What is the limitation of this concept? Answer AttributionSource : Link , Question Author : zack , Answer Author : Community
I’m stuck on a point while reading about these different accessing methods. As per author. Sequential access Memory is organized into units of data, called records.Access must be made in a specific linear sequence. I understand that it will take variable time to access due to sequential ordering. Direct Access individual blocks or records have … Read more
In general, we have these types of NAND flash cells: SLC, MLC, TLC, and QLC. Since MLC flash cells can store 2 bits, the content of the cell can be 00, 01, 10, or 11 which are detected using different threshold voltages. Each 4KB flash page includes 32768 bits and, thus, 16384 MLCs. So, the … Read more
I’m currently developing a simple key-value NoSQL store and want to build its formal model. I found article about key value formalisation with category theory, but I’m interested are there some works about formalisation of key-value stores except category theory (I know we can use it for all, but…)? I want to use some more … Read more
I’m trying to optimize a system with a better algorithm for allocating storage. The system has ‘N’ writer processes and ‘M’ disks. (N < 30, M < 10. N can change, M is constant). Any process can write to any disk and each process regularly writes a file every, say, 5 minutes, but the size … Read more
Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Computer Science Stack Exchange. Closed 7 years ago. Improve this question I am having a rather distressing confusion about whether storage media and storage devices are the same terms. I found on … Read more
Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Computer Science Stack Exchange. Closed 7 years ago. Improve this question All data recovery companies, regardless of skill, unanimously say that if the memory chip of a device has just a hair … Read more
Lets take, for example this jpeg image here The image there is 400 x 300, or 120000 pixels and The file size of the image (on my computer) is shown to be 65171 bytes. This means the computer stores about 2 pixels in every byte. How does it do this? Is it due to the … Read more
According to this picture ROM is classified under Main Memory , but isn’t ROM a secondary storage because it’s external and non volatile ? Any clarification with reference links will be highly appreciated. Thank you. Answer The distinction between primary and secondary storage relies on several joint characteristics which the prototypical examples – RAM and … Read more
