Hiring guide for DB/C DX++++ Engineers

DB/C DX++++ Developer Hiring Guide

The DB/C DX++++ is a high-level computer programming language, developed by DB/C Software in the 1980s. It is an advanced version of the original DB/C language, offering enhanced features for database management and manipulation. The "DX++++" signifies its superior capabilities in handling complex data structures and algorithms. This language has been widely used in various industries for its efficiency and reliability. Its development marked a significant advancement in the field of computer science, as documented by numerous tech publications and historical records.

Ask the right questions secure the right DB/C DX++++ talent among an increasingly shrinking pool of talent.

First 20 minutes

General DB/C DX++++ app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in DB/C DX++++ application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

How would you create a new database in DB/C DX++++?
You would use the CREATE DATABASE command followed by the name of the database.
What are the main features of DB/C DX++++?
Some of the main features include multi-user capabilities, transaction processing, and compatibility with a wide range of software and hardware.
Describe the difference between DBC and DBCS in DB/C DX++++.
DBCS is the Single-User version of DB/C DX++++, while DBC is the Multi-User version.
How would you handle errors in DB/C DX++++?
Errors can be handled using the ERROR command, which allows you to specify an error number and message.
What are the steps to compile a program in DB/C DX++++?
You would use the COMPILE command followed by the name of the program.
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What you’re looking for early on

Has the candidate demonstrated a solid understanding of DB/C DX++++?
Does the candidate show problem-solving skills?
Is the candidate able to communicate effectively?
Does the candidate have experience with similar projects?

Next 20 minutes

Specific DB/C DX++++ development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

Describe the difference between a stored procedure and a function in DB/C DX++++.
A stored procedure does not return a value and is used to perform actions, while a function returns a value and is used to compute a value.
How would you optimize a query in DB/C DX++++?
You can optimize a query by using indexing, limiting the number of results returned, and avoiding unnecessary joins.
What are the different types of joins in DB/C DX++++ and when would you use each one?
There are four types of joins: inner join, left join, right join, and full join. The type of join used depends on the data that needs to be retrieved.
Describe the difference between a primary key and a foreign key in DB/C DX++++.
A primary key is a unique identifier for a row of data, while a foreign key is used to link two tables together.
How would you implement a many-to-many relationship in DB/C DX++++?
A many-to-many relationship can be implemented by creating a junction table that includes foreign keys to both of the related tables.
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The ideal back-end app developer

What you’re looking to see on the DB/C DX++++ engineer at this point.

At this point, a skilled DB/C DX++++ engineer should demonstrate strong problem-solving abilities, proficiency in DB/C DX++++ programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with DB/C DX++++.

What does the following simple DB/C DX++++ code do?
LET X = 5
LET Y = 10
LET Z = X + Y
DISPLAY Z
This code sets the variables X and Y to the values of 5 and 10 respectively, then adds them together and assigns the result to Z. Finally, it displays the value of Z, which will be 15.
What will be the output of the following DB/C DX++++ code?
LET A = 7
LET B = 3
LET C = A MOD B
DISPLAY C
This code sets the variables A and B to the values of 7 and 3 respectively, then calculates the modulus of A and B (the remainder of the division of A by B) and assigns the result to C. Finally, it displays the value of C, which will be 1.
What does the following DB/C DX++++ code do with the array?
LET ARR = [1, 2, 3, 4, 5]
FOR I = 1 TO LEN(ARR)
DISPLAY ARR[I]
ENDFOR
This code declares an array ARR with 5 elements. Then it enters a for loop that iterates from 1 to the length of the array. In each iteration, it displays the element at the current index of the array. So it will print all the elements of the array, one per line.
What does the following DB/C DX++++ code do related to threading?
THREAD CREATE MYTHREAD
WAITFOR MYTHREAD
This code creates a new thread named MYTHREAD. The 'WAITFOR' command then pauses the execution of the current thread until MYTHREAD has completed. This is an example of how multithreading can be managed in DB/C DX++++.

Wrap-up questions

Final candidate for DB/C DX++++ Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle DB/C DX++++ application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

What are the different types of indexes in DB/C DX++++ and what are their uses?
There are two types of indexes: clustered and non-clustered. Clustered indexes sort and store data rows in the table based on their key values, while non-clustered indexes store data at one location and indexes at another.
Describe the difference between UNION and UNION ALL in DB/C DX++++.
UNION combines the results of two or more SELECT statements and removes duplicates, while UNION ALL does the same but does not remove duplicates.
How would you handle transactions in DB/C DX++++?
Transactions can be handled using the BEGIN TRANSACTION, COMMIT, and ROLLBACK commands.

DB/C DX++++ application related

Product Perfect's DB/C DX++++ development capabilities

Beyond hiring for your DB/C DX++++ engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in DB/C DX++++ projects, and can engage in multiple capacities.

DB/C DX++++ Consultive assessments

Custom DB/C DX++++ development projects

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