Deutsche Bank Senior Plsql Developer Interview Questions, Process, and Tips

Q1. Difference between hashmap and hash table
Ans. 
HashMap is non-synchronized and allows null values, while HashTable is synchronized and does not allow null values.
• HashMap is non-synchronized, meaning it is not thread-safe, while HashTable is synchronized and thread-safe.

• HashMap allows null values for both keys and values, while HashTable does not allow null keys or values.

• HashMap is generally preferred for non-thread-safe applications, while HashTable is used in mul
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Q2. Significance of equals and hashcode in java
Ans. 
Equals method is used to compare the content of objects while hashcode method is used to generate a unique integer value for an object.
• Equals method is used to compare the content of objects for equality.

• Hashcode method is used to generate a unique integer value for an object.

• Both methods are important for implementing proper object comparison and hashing in Java.
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Q1. What motivates you to come to office
Ans. 
I am motivated to come to the office by the opportunity to work on challenging projects, collaborate with talented colleagues, and contribute to the success of the team.
• Challenging projects provide a sense of accomplishment and growth

• Collaborating with talented colleagues allows for learning and innovation

• Contributing to the success of the team fosters a sense of purpose and fulfillment
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Q2. Any scenario where you coached and mentored your collegue in previous organisation?
Ans. 
Yes, I coached a junior developer on implementing design patterns in a project.
• Provided guidance on how to apply design patterns in code

• Reviewed their code and provided feedback for improvement

• Encouraged them to ask questions and seek clarification
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Q1. What is mixed dml error
Ans. 
Mixed DML error occurs when DML operations on setup and non-setup objects are mixed in a single transaction.
• Mixed DML operations involve a combination of DML statements on both setup and non-setup objects in a single transaction.

• This error typically occurs when trying to update a setup object (like User) and a non-setup object (like Account) in the same transaction.

• To resolve the error, separate the DML operations on s...read more
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Q2. Types of asynchrnous class
Ans. 
Types of asynchronous classes include future, batch, queueable, and scheduled classes.
• Future classes are used for executing code asynchronously in the background.

• Batch classes are used for processing large data sets in smaller chunks.

• Queueable classes are used for chaining asynchronous jobs together.

• Scheduled classes are used for running code at specific times.
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Q3. Profile permission set
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Q4. Custom metadat, custom setting
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Q5. Displayed a lwc component and asked how its code would be >?
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Q6. How to call child method in parent in lwc
Ans. 
To call a child method in a parent component in LWC, you can use the @api decorator in the child component and import the child component in the parent component.
• Use @api decorator in the child component to expose the method or property that you want to call from the parent component.

• Import the child component in the parent component and use the child component's reference to call the method or access the property.

• Pass...read more
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Q1. Experince on lwc
Ans. 
Experience with Lightning Web Components (LWC) in Salesforce development.
• Developed custom Lightning Web Components for Salesforce applications.

• Used LWC to create interactive and responsive user interfaces.

• Utilized LWC to fetch and display data from Salesforce database.

• Implemented event handling and communication between components using LWC.

• Followed best practices and design patterns while working with LWC.

• Integrated L...read more
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Q2. How to call lwc from aura
Ans. 
To call LWC from Aura, use the lightning/navigation service.
• Use lightning/navigation service to navigate to the LWC component

• Pass the component name and any parameters needed

• Handle any events or data passed back from the LWC component
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It had more than 30 aptitude questions and 2 coding questions

Q1. It was totally a tech round all questions were from Data structure, dbms, java, computer networking
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It was spring boot java based online round

Q1. Optional in java.
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Q2. Eager and lazy initialization in simgleton design pattern
Ans. 
Eager initialization creates the instance of Singleton class at the time of class loading, while lazy initialization creates the instance only when it is required.
• Eager initialization can lead to resource wastage if the instance is never used.

• Lazy initialization is more efficient as it only creates the instance when needed.

• Eager initialization is thread-safe by default, while lazy initialization requires synchronizatio...read more
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