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notka56 [123]
3 years ago
11

The sql command ________ adds one or more new columns to a table.

Computers and Technology
1 answer:
vekshin13 years ago
3 0

Answer:

alter table

Explanation:

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3 years ago
When the POST is complete,t he operating systems is loaded into?
Lina20 [59]
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</span><span>Once the Operating System (OS) is located, the CPU copies what’s called the 'boot record' from the OS into DRAM. 

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3 years ago
What is the capacity of a disk with two platters, 10,000 cylinders, an average of 400 sectors per track, and 512 bytes per secto
natita [175]

Answer:

The capacity of the disk is "40 GB".

Explanation:

Given value:

\to \text{cylinder}= 10,000\\\\\to \frac{sector}{track} = 400\\\\\to \frac{bytes}{sector} = 512\\

\text{Calculating the size of track} =  \frac{bytes}{sector} \times  \frac{sector}{track}

                                            = 512 \times  400 \\\\ = 204,800 \ \ Or  \ \ 200 \ K

\text{Calculating the size of surface} = \frac{byte}{track} \times \ cylinder

                                               = 2000 \ K \times  10,000 \\\\ = 20, 000,000 \ K

\text{Calculating the capacity of a disk} = \frac{byte}{surface} \times \frac{surface}{disk}

                                                     = 20, 000,000 \ K \times  2 \\\\ = 40, 000,000 \ K \\\\= 40 \ GB

Cache memory is often used to speed up the runtime. It will enable us to improve performance unless we can store information, that is retrieved constantly in memory space.

  • Hit Cache: when the Processor relates to representing database data, Cache Hit results.
  • Miss Cache: when this Processor responds to a non-present cache data, this will trigger its miss of cache.
  • It doesn't have to retrieve the Main Memory through secondary storage.
3 0
3 years ago
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