SQL Server mirroring for more than 10 databases

I have a SQL Server instance with more than 40 databases and I want to mirror to another instance server.

But when I read about mirroring, I find this limitation:

On a 32-bit system, due to the number of worker threads used by each database mirroring session, database mirroring can support a maximum of about 10 databases per server instance. For a 64-bit operating system, depending on the database, you can mirror more than 10 databases based on the number of processors and worker threads.

question

How can I mirror all of my databases? Or what do I need as server equipment to mirror all of my over 40 databases?

Unit test – are in-memory databases a form of integration test?

An in-memory database can be useful for both unit tests and integration tests, but it depends on what you're trying to do.

Unit tests test a single component. Ideally, this device is tested in isolation from other components, but this is not essential. The use of other tested components in a component test is okay for practical reasons. Isolated tests usually run faster and point out the cause of the error. However, setup can be difficult unless the software has been used designed on testability, for example by minimizing dependencies between components and connecting components via small, easily mocked interfaces.

Integration tests check the interactions between components. Components that are irrelevant in this test can still be mocked. But this is also a compromise between speed and fault location compared to comfort. Some tests are so difficult to set up that they are not worth setting up!

An in-memory database is useful for both unit tests and integration tests when you don't want to mock a full data access layer or when you need a real database because of an ORM. Here, using an in-memory database is easier to set up, faster, and provides easy isolation between tests by setting up a new database for each test.

However, this does not test the integration between your software and the actual database. These differences can be significant due to SQL dialects, etc. Therefore, a test plan should also include tests with the real database software, e.g. in a staging environment.

In practice, it is not particularly important to clearly differentiate between unit tests and integration tests. It is more important that you have a good automated test suite and possibly tools and instructions for reproducible manual tests. Personally, I mainly write integration tests because they make it easier to demonstrate value of the software tested and because they offer better confidence in how the software works as a whole. I've found that BDD-style integration tests are particularly helpful, although they still require the use of fine-grained TDD-style unit tests.

Will Multi-AZ RDS provided by AWS always have two databases?

I have a database available in AWS RDS with the Multi-AZ function. I also tested the failover to understand that it was working. But my doubt is this:

  1. During the failure of the primary database, the secondary database is increased as the primary database. So what happens to the previous primary database? Will it be restarted and placed as secondary?
  2. If it restarts, there is only one instance during that period and what if it also fails?
  3. Also what are the conditions of failure. Or just consider AWS
    Hardware failure?

PHP – Access data from two databases from two different tables in one query

Guys, I have a problem.
I currently have two databases and two tables (1 table in each bank) that need to be linked into one query just. It would be one JOIN In other words, however, I cannot understand how I do this in another database.

The connection between the banks has the same username and password, but different calls.

Financial bank = $financeiro->query();

Bank customers / site = $site->query();

I tried using a JOIN and some other results that I found on Google, but I was unsuccessful when I needed to access another bank.

We currently have the field cliente in the table financeiro and the field chns in the table clientes, where the chns is the unique customer code that is used throughout the system for identification.

I wanted SQL in this style (if possible) that I already use for connections within the same bank:

$financeiro->query("SELECT * FROM financeiro AS FA JOIN clientes AS CL ON FA.cliente = CL.chns ORDER BY CL.nome ASC");;

All connections are made PDO.

stored procedure with MYSQL in the child tables with fk. Can anyone help create a stored procedure for insertion using MySQL databases?

I have three tables. Here are the tables with their columns attached. I have to insert stored procedure data with MYSQL into the child tables with FK. Can anyone help create a stored procedure for insertion using MySQL databases?
Thank you very much

EmpIdentification
Create table empIdentification (empId int not null primary key auto_increment, first name varchar (13), last name varchar (14), date of birth, gender char (1), title varchar (18));

empaddress
Create a table address (addtype varchar (14), number int, street varchar (19), Unit varchar (12), City varchar (13), State char (2), ZIP code char (5), EmpId int, foreign key (EmpId ) refers to empIdentification (EmpId));

communication
Create table communication (Comtype varchar (12), value varchar (15), preferred varchar (8), EmpId int, foreign key references (EmpId) empIdentification (EmpId));

How do I migrate the SQL Server instance and system databases to a different drive (mapped to a different letter) on the same server?

My job is to move our SQL Server instance and system databases from the existing drive to a new drive on the same server. I know I can stop the SQL Server service, literally move the instance and database files to the new drive, and start the service again, but the drive is mapped to a different letter.

I suspect I need to update the database file paths for the system databases to point to the new drive letter.

What else do I need to do to reconfigure the instance so that it points to the correct drive to ensure that it works properly when I restart the service?

Edit: It sounds like this Microsoft document is fairly comprehensive on what to do, especially from the system database perspective. However, are there other steps or pitfalls that I should be aware of from the point of view of the instance: moving system databases

Note: I cannot reuse the same drive letter for business reasons.