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fenix001 [56]
3 years ago
15

Which statement describes a feature of Oracle sequences? Oracle sequences generate a character string that can be assigned to ta

bles. Oracle sequences are tied to columns and tables. An Oracle sequence uses the identity column property to automatically number rows. Dropping a sequence does not delete values assigned to table attributes; it deletes only the sequence object from the database.
Computers and Technology
1 answer:
mylen [45]3 years ago
8 0

Answer:

An Oracle sequence uses the identity column property to automatically number rows.

Explanation:

An Oracle sequence is a tool that can be used to generate a number sequence. Oracle has the capacity to help you create an auto-number field by using one of its tools called sequence.

A sequence is an object in Oracle that is used to generate a number sequence for input to a table. This is required when you need to generate primary key values by the use of identity columns.

So, Oracle sequence can automatically number rows by the use of identity columns.

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How many possible keys does the playfair cipher have? an approximate power of 2
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I don't know but I am guessing 666 or 777 or 888.
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A ____ is a device that interconnects two or more workstations in a star-wired bus local area network and immediately retransmit
prisoha [69]

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A HUB

Explanation:

A hub can described as an hardware or network device use for multi purpose functions like connecting series of internet devices together there by making it possible for all devices to work or function together on a single network.

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3 years ago
g Assume that this program is run on a processor with data cache of size big enough that the entire array arr can fit in the cac
Dimas [21]

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7 0
2 years ago
In a batch operating system, three jobs are submitted for execution. Each job involves an I/O activity, CPU time and another I/O
Ilia_Sergeevich [38]

Answer:

a) CPU utilization for uniprogramming system = 18.2%

b) CPU utilization for multiprogramming system = 41.379%

Explanation:

IO time = total time – CPU time

For JOB 1  

CPU time = 3ms ,

total time= 23ms

IO time = 23-3 = 20ms ,

For JOB 2

CPU time =5ms

total = 29ms

IO time = 29-5 = 24ms  

For JOB 3  

CPU time = 4ms

total = 14ms

IO time = 14-10 =10ms  

1.) In uniprogramming system, operations are performed sequentially

CPU utilization=total CPU time / total real time

CPU utilization =(3+5+4) / (23+29+14)

CPU utilization =0.182 or 18.2%

2) In multiprogramming system, jobs wait for the CPU to get free while performing IO operations concurrently

steps followed by the os

1. IO for 1st job                           at 0ms

2. IO for 2nd job                          at 0ms

3. IO for 3rd job                          at 0ms

4. CPU time for 3rd job              at 5ms

5. Next IO job for 3rd job           at 9ms END at 14ms

6. CPU time for 1st job              at 9ms

7. Next IO job for 1st job           at 14ms END at 23ms

8. CPU time for 2nd job             at 14ms

9. Next IO job for 2nd job          at 15ms END at 29ms

CPU time is 3+5+4 =12ms

Total execution time = 29ms

CPU utilization = 12*100/29= 41.379%

5 0
2 years ago
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