❓ASK – Any Android app you want to refer me? That can earn atleast 1$ per day or per referral? | Proxies-free

Hello guys, I really need a money now because i already lost my Job because of this Pandemic. I hope someone can help me how to Earn atleast 1$ per Day buy just using an android phone. My phone is Only OppoF1s with 3GB RAM and 32GB ROM so its not really a good specs.

database theory – What does the three schema architecture of DBMS refer to?

This architecture contains three layers or levels of the database management system:

  • External level

  • Conceptual level

  • Internal level

Can some one explain to me with a practical real example so that i can understand this?

Before constructing a data model does enterprise’s architects consider to make a three schema architecture of DBMS. But I am totally confused with this abstract model.

sony – What does the T* written in orange refer to?

T* refers to Zeiss T* anti-reflective coatings applied to the Electronic View Finders on Sony Cameras. I believe it first appeared on the Sony A7R II in 2015.


The EVF gets an update too with a new best-in-class 0.78x Tru-Finder that delivers a larger view than any cameras in the category. 1.0x magnification would be actual size of a 35mm frame. Previous a7-series cameras along with most fullframe optical viewfinders are around 0.70. That’s a much more visible improvement than the number of pixels. Zeiss T coating have been added to an additional element for a sharper view especially at the edges – at least for eyeglass wearers like me.*

In short, it’s Bigger and Clearer.

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Why is it allowed to refer .net framework libraries in a .net standard library?

The other way to look at it is that .NET standard, being a specification, is like an interface. Whenever you add a reference to a .NET standard library, as long as the reference meets the specification definition, then the library doesn’t care what type it is. Implementation is separate from specification.

As you said, if you add a .NET framework library to a .NET standard library, then you can no longer run it on .NET Core, but this is a runtime issue rather than an edit time or compile time issue.

r – use string content of a variable to refer to a column in a dataframe using transmute dplyr

I would like to use the variable “second_column” as a variable to refer to the column “test1$b”. I tried different things, but couldn’t find any solutions yet. test1 and test2 should be the same in the end…

test1 <- data.frame(a = 1:5, b = 6:10)

second_column = "b"

test2 <- test1 %>% 
  transmute(variable1 = a,
         variable2 = second_column


bash – what does start and end refer to in the disk managment on linux

I have started learning basic IT and Disk management on Linux for a program I am writing. I started with the parted tool and when creating a disk it requires start and end values for creating partitions and I don’t understand what start and end refer to.(as you can see below there are start and End columns they are what I refer to)

test@test:~$ sudo parted -l
(sudo) password for test: 
Disk /dev/sda: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type      File system  Flags
 1      1049kB  538MB   537MB   primary   fat32        boot
 2      539MB   21.5GB  20.9GB  extended
 5      539MB   21.5GB  20.9GB  logical   ext4

Model: DiskModel
Disk /dev/sdb: 4005MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type     File system  Flags
 1      65.5kB  4005MB  4004MB  primary  ntfs         boot

All help is much appreciated, thank you in advance, Yovel.

registration – refer others to get free course plugin

I really don’t know how exactly I should ask this. But I am creating an LMS website in WordPress. And I have free and paid courses. Now what I want is. Let’s say a user named “John” wants a course worth 500. John doesn’t want to pay so he will send a referral link to 3 other users. if those 3 users register on my website (Only register not buying anything) then John will get that course which was 500 for free.

Now I hope you guys understand now tell me is there any plugin that I can use to achieve this functionality.

Or any other suggestion, kindly tell me.

sharepoint server – The URL is invalid. It may refer to a nonexistent file or folder, or refer to a valid file or folder that is not in the current Web?

To narrow down the issue:

  1. Do all libraries have this issue?
  2. Check for the ULS logs, which will tell you more information.

Browse to the content database for the site in the SQL Server Management Studio
Expand ‘Databases’ and right-click on the content database to select “Properties”.

Select “Options” from the left pane in the pop-up window.

The option “Auto Create Statistics” must be set to “False”. If it is set to “True”, it must be toggled to “False”.

unity – Should I do interactions between a new class and the main engine via a redirector class, or directly refer to only the classes the new class needs?

I’m making an open-source voxel engine, and there’s an architectural problem that I would like an answer to. I have come up with 2 different solutions, and would like your opinions on:

When I’m creating a new class for a feature that uses the voxel engine, should the new class only refer to a big re-director class called VoxelWorld that redirects the calls to whatever component is responsible for it (solution 1), OR should the new class directly refer to only the classes it actually needs. Simply put, should the new class refer to the entire voxel engine, or just the parts it needs to?

This may be similar to a monolithic vs microservice problem?

Solution 1: All interactions go through a single entry point (I shall call it the VoxelWorld class). It’s a single class, which would redirect all calls to whichever component is responsible for it. Examples of those calls would be for example VoxelWorld.GetVoxelData(position) or VoxelWorld.UnloadChunk(position). These calls would be coming from wherever, maybe a custom class made by the user such as a TerrainDeformer.

The TerrainDeformer would only have a reference to VoxelWorld, and nothing else (except for all the parameters it needs to deform the terrain, such as the deformation range). The TerrainDeformer would simply call VoxelWorld.EditTerrain(listOfModifications), and that’s it. The VoxelWorld would be responsible for redirecting the EditTerrain call to whichever class is responsible for editing the terrain, for example, a VoxelWorldEditor.

The VoxelWorld.UnloadChunk call would be redirected to ChunkManager, which is responsible for managing chunks. Here’s a picture to better explain it:

Visualization of solution 1

The public VoxelWorld would be the only public class in assembly A. Everything else is internal, meaning they are only visible for other classes inside assembly A. The assembly A is also like a black box, it is mostly (except for the VoxelWorld) hidden from the outside project. It just works, that’s not a good ideology, but sometimes a necessary one. Everything in assembly B is easily extensible and public to the user. It contains the code the user would be messing with.

VoxelWorld would essentially by only a redirector of calls. It would have absolutely no logic, only redirections. A function in VoxelWorld.cs could look like this:

public void LoadChunk(int x, int y, int z){
    ChunkManager.LoadChunk(x, y, z);

Solution 2: Everything that the user wants to add refers to only the classes it really needs. Now, forget all that public/internal/redirecting stuff from solution 1, but keep in mind the different classes. This is kind of like the interface segregation principle, but just without the interface part.

The interface-segregation principle (ISP) states that no client (e.g.
should be forced to depend on methods it does not use
(e.g. LoadChunk)

In solution 1, everything depends on everything. That’s the blessing and the curse of solution 1. In solution 2, that’s not a problem because a class only depends on what it actually needs.

Visualization of solution 1

Solution 2 is more traditional and maybe cleaner -> easier to maintain. I feel like I like solution 2 more than solution 1, but both seem good. Here’s the main benefits and disadvantages:

Solution 1:

+Easy to use API (VoxelWorld.DoWhatever())

-It contains a black box, so it’s harder for the user to extend the very core features. (Of course, it wouldn’t be an actual black box, this is open source, it’s just something that the user shouldn’t mess with)

Solution 2:

+Easier to maintain and extend

-More difficult API, everything is scattered so the user has to explicitly know if some feature already exists (in solution 2, the user can just scroll through the suggested functions for VoxelWorld.___())

So, which solution do you recommend, and why? Or is there some third solution that I haven’t thought about?

This was quite a long question, but I hope it can help others who might have the same problem. I tried googling but didn’t find anything related to this kind of problem, but I didn’t really even know what to search for.

malware – Why is the term “nation state” used to refer to a government-sponsored effort in infosec, and is it accurate?

I work in infosec and as such, have read many whitepapers and been to many conference talks. I hear all the time, especially in conversation and literature about malware, the term “nation state” used to refer to a government entity or government-sponsored activity. The term “state actor” is also used.

My question is, why? According to Wikipedia:

A nation state is a state in which a great majority shares the same culture and is conscious of it. The nation state is an ideal in which cultural boundaries match up with political boundaries.1 According to one definition, “a nation state is a sovereign state of which most of its subjects are united also by factors which defined a nation such as language or common descent.” It is a more precise concept than “country”, since a country does not need to have a predominant ethnic group.

According to Merriam-Webster, the definition is:

a form of political organization under which a relatively homogeneous people inhabits a sovereign state

Is there some inherent need for the government sponsor to be primarily of one ethnic background in infosec literature? I just don’t understand why this term in particular is so frequently used, when there are many forms of states, such as a federated state, multinational state, or even more general terms such as “government” or “country,” all of whom would likely be capable of and do participate in infosec activities.