ec3 | Elastic Cloud Computing Cluster tool | Machine Learning library

Instead of storing the variable's value, you can store its name and look that up:

That’s handled by the docker-compose process. Have a look in your docket-compose.yml file:

As an alternative to COM, you could host the .NET Core runtime in your native process to call managed code.

Hosting the .NET Core runtime is an advanced scenario and, in most cases, .NET Core developers don't need to worry about hosting because .NET Core build processes provide a default host to run .NET Core applications. In some specialized circumstances, though, it can be useful to explicitly host the .NET Core runtime, either as a means of invoking managed code in a native process or in order to gain more control over how the runtime works.

Links:

• Hosting .NET Core
• Hosting .NET Core Clr in your own process

With tidyverse, we place all the columns to group in the group_by and then mutate the 'db_perk' by dividing with the first observation of that column

arrange_at is useful here, since it allows defining the columns using the vars() construct.

An example:

You should use AWS IAM Role to authenticate AWS services. AWS IAM Role should have AWS S3 necessary permission and attach the role to an EC2 instance. Whenever you make S3 request, it will authenticate through IAM role. By the way, you don't need credentials file in the application.

If you want an array back, you shouldn't implode. You are almost there:

I think that you answered many part of your question very well. I just notify some other points.

Note 1: about TableCommon strategy

I strongly recommend to use TableCommon to save common fields. It has not many side effects on your evaluation parameters (Performance, Redundancy, Scalability, Maintenance and etc.).

Note 2: about Link table strategy The parameters that are important here:

1. The number of records in Entities A,B,C and D
2. The number of record in many-to-many relationships among them
3. The number of CRUDs from these many-to-many relationships

If you have a lot of records in them and you have a lot of CRUDs and the performance of them is vital, you should not use Link table strategy.

However, If you have only two or more tables (for example EntityA and EntityB) that have a lot of records in many-to-many relationship, you can use EntityAB strategy only for them and use Link table strategy for the others.

Note 3: using Fact Table between Entity A,B,C and D

I know that it is very bad design at the first look.
But, based on the evaluation parameters, it can be useful in some cases.

Using Fact Table like this:
gathering F.Ks of all Entities A,B,C and D in one table.

First Cons:

1. If the many-to-many relationships have many other fields, we cannot use this strategy.
2. There are many bad Nullification in that Fact Table.

Pros:

1. You can fetch all EntityA relationships in one record.
2. Reduce the number of entities.
3. Reduce the number of records.

Original source code is written in C where references don't exists so CoCreateInstance declared in C to accept pointer to CLSID as first parameter. While in C++ CoCreateInstance is declared to accept a reference to CLSID as first parameter but you still trying to pass a pointer. And so on. Therefore you get these errors. Recompile your code as C or remove unnecessary address takes.