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Bond [772]
3 years ago
10

Match each term to the appropriate definition. DBMS data mining hash file index key field locking protocol relation roll back sc

hema SQL A. A means of locating a particular record within a file B. The process of extracting hidden information C. A storage system that provides efficient access to randomly chosen items D. A structural unit (with rows and columns) in a popular database model E. A system to guard against database errors due to performing transactions concurrently F. An item used to identify records uniquely G. Performs database operations requested by application software H. A popular language that implements relational database operations I. A "road map" of a particular database's design J. To "unwind" a transaction
Computers and Technology
1 answer:
puteri [66]3 years ago
5 0
The correct answer is e just took the test on edg
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Which part of the computer contains logic circuity which interrupts instructions from a program​
poizon [28]

Answer:

The control unit of the CPU contains circuitry that uses electrical signals to direct the entire computer system to carry out stored program instructions.

Explanation: The control unit does not execute program instructions rather, it directs other parts of the system to do so.

6 0
3 years ago
A support technician uses the ping utility on a system that is online, yet no response is received. What should be allowed throu
alexgriva [62]

Answer:

Internet Control Message Protocol (ICMP) Echo Requests

Explanation:

A system that has Windows Firewall or antivirus or other third party antivirus enabled with their configuration setting set to default, ping command from another device will not be able to see if the device with an enabled firewall is alive.

The ping command sends Internet Control Message Protocol (ICMP) Echo Request to a destination device after the destination device will reply with a Reply packet. However, by default, firewalls, such as Windows firewall blocks ICMP Echo Requests from the external network and pinging will  work when the firewall is disabled or an exception is created that lets ICMP Echo Requests pass through the firewall.

4 0
3 years ago
The procedure by which a process's state is saved before being swapped out of the cpu, then us restored to the state when the pr
belka [17]

The procedure is known as<u> context switching</u>.

In the field of computers, context switching can be described as a procedure in which a process is stored so that it can be executed at a later point. Such a procedure allows multitasking operations easier. A simple CPU can be utilized for multiple processes.

After a task is done, it can be swapped out of the CPU and can be restored later. By using context switching, more space can be provided on a CPU as freeing from one process will make space for the other.

When switching a process, the status of the older running process is saved on the CPU as registers.

Context switch makes it feasible to share one CPU for multiple procedures hence reducing the concerns that arise from using additional processors.

To learn more about context switch, click here,

brainly.com/question/21685677

#SPJ4

3 0
1 year ago
Pick the 3 correct Python functions that parse and output only the date and time part of each log in log.txt as follows.
Mila [183]

Answer:

1, 4, 5

Explanation:

parse2:

. In this case it's passing "r" as an argument, which really does absolutely nothing, because whenever you call open("file.txt") it defaults to reading mode, so all you're doing is explicitly passing the "r". So let's look at the first line. Whenever you call str.split() without any arguments, by default it splits it by empty text, and filters any empty text. So str.split() is not the same as str.split(" ") although it has similar behavior. "     ".split(" ") will output ['', '', '', '', '', ''], while "     ".split() will output []. So in this case the line.split() will split the string '10.1.2.1 - car [01/Mar/2022:13:05:05  +0900] "GET /python HTTP/1.0" 200 2222' into the list<em> ['10.1.2.1', '-', 'car', '[01/Mar/2022:13:05:05', '+0900]', '"GET', '/python', 'HTTP/1.0"', '200', '2222'].</em> As you can see the the data is split into two pieces of text, AND they include the brackets in both strings. So when it gets the 3 index and strips it of the "[]" it will have the incomplete date

parse3:

 In this instance the "r" does nothing as mentioned before the "r" is already defaulted whenever you call open("file.txt") so open("file.txt") is the same as open("file.txt", "r"). So in this case we won't be working left to right, we're going inside the brackets first, kind of like in math you don't don't work left to right in equation 3 + 3(2+3). You work in the brackets first (inside brackets you do left to right). So the first piece of code to run is the line.split("[" or "]"). I actually kind of misspoke here. Technically the "[" or "]" runs first because this doesn't do what you may think it does. The or will only return one value. this is not splitting the line by both "[" and "]". The, or will evaluate which is true from left to right, and if it is true, it returns that. Since strings are evaluated on their length to determine if they're true. the "[" will evaluate to true, because any string that is not empty is true, if a string is empty it's false. So the "[" will evaluate to true this the "[" or "]" will evaluate to "[". So after that the code will run line.split("[") which makes the list: <em>['10.1.2.1 - car ', '01/Mar/2022:13:05:05  +0900] "GET /python HTTP/1.0" 200 2222']</em>. Now the [3:5] will splice the list so that it returns a list with the elements at index 3 (including 3) to 5 (excluding 5). This returns the list: [], because the previous list only has 2 elements. There are no elements at index 3 to 5 (excluding 5). So when you join the list by " ", you'll get an empty string

parse4:

  So I'm actually a bit confused here, I thought the "r+" would open the file in read-writing mode, but maybe this is a different version of python I have no idea, so I'm going to assume it is reading/writing mode, which just means you can read and write to the file. Anyways when you split the line by doing line.split(), as mentioned before it will split by empty spaces and filter any empty spaces. This line will return: <em>['10.1.2.1', '-', 'car', '[01/Mar/2022:13:05:05', '+0900]', '"GET', '/python', 'HTTP/1.0"', '200', '2222']</em>. and then you splice the list from indexes 3 to 5 (excluding 5). This will return the list: <em>['[01/Mar/2022:13:05:05', '+0900]']</em> which has the two pieces of information you need for the date. Now it joins them by a space which will output: '[01/Mar/2022:13:05:05 +0900]'. Now when you strip the "[]" you get the string: '01/Mar/2022:13:05:05 +0900' which is the correct output!

parse 5:

 So in this example it's using re.split. And the re.split is splitting by "[" or "]" which is what re.split can be used for, to split by multiple strings, which may be confused by string.split("[" or "]") which is not the same thing as explained above what the latter does. Also the reason there is a backslash in front of the [ and ] is to escape it, because normally those two characters would be used to define a set, but by using a \ in front of it, you're essentially telling regex to interpret it literally. So in splitting the string by "[" and "]" you'll get the list: <em>['10.1.2.1 - car ', '01/Mar/2022:13:05:05  +0900', ' "GET /python HTTP/1.0" 200 2222']</em> which has 3 elements, since it was split by the [ and the ]. The second element has the date, so all you need to do is index the list using the index 1, which is exactly what the code does

8 0
1 year ago
Does the wireless signal between the cell phones require matter to travel from one phone to another?
mrs_skeptik [129]

Mobile phones transmit and receive signals using electromagnetic waves, that is, wireless signal are electromagnetic waves which can travel through a vacuum, they do not need a medium or matter.

<h3>What are electromagnetic waves?</h3>

They are generated by electrical and magnetic particles moving at the same time (oscillating).

<h3>Characteristics of electromagnetic waves</h3>

  • Network waves are electromagnetic waves.

  • A mobile phone has coverage when it receives electromagnetic waves from at least one base station.

  • They do not necessarily require a material medium for their propagation.

Therefore, we can conclude that electromagnetic waves are those that do not need a material medium to propagate and include, among others, radio, television and telephone waves.

Learn more about electromagnetic waves here: brainly.com/question/13803241

3 0
2 years ago
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