40+ Production Support Analyst Interview Questions and Answers

Query to find last string from emp table

• Use the ORDER BY clause with DESC keyword to sort the table in descending order

• Use the LIMIT keyword to limit the result to 1 row

• Assuming the last string refers to the last row in the table

To get the value present at 80th row, 100th column, you can use the command 'awk' in Unix/Linux systems.

• Use the 'awk' command with the syntax 'awk 'NR==80 {print $100}' filename' to get the value at the specified row and column.

• Replace 'filename' with the actual file name where the data is stored.

• Ensure that the row and column numbers are adjusted based on the indexing starting from 1 in 'awk'.

The command to search a file like test.txt in Linux is 'grep'.

• Use the 'grep' command followed by the search term and the file name to search for a specific text in a file.

• For example, to search for the word 'hello' in a file named test.txt, you would use the command 'grep hello test.txt'.

Constructor is a special type of method used to initialize objects, while a method is a block of code that performs a specific task.

• Constructor is called when an object is created, while a method is called to perform a specific task.

• Constructors do not have a return type, while methods have a return type.

• Constructors have the same name as the class, while methods can have any name.

• Example: Constructor - public ClassName() { // constructor code } Method - public void methodNam...read more

HashMap is not thread-safe while ConcurrentHashMap is thread-safe.

• HashMap is not thread-safe and can lead to ConcurrentModificationException if modified while iterating.

• ConcurrentHashMap allows concurrent modifications without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on different segments concurrently.

• ConcurrentHashMap is preferred for multi-threaded environments wher...read more

I established a connection by configuring network settings, using appropriate protocols, and verifying server accessibility.

• Configured network settings such as IP address and subnet mask to ensure proper communication.

• Used protocols like TCP/IP to establish a reliable connection.

• Verified server accessibility through ping tests to check connectivity.

• Utilized tools like SSH or RDP for secure remote access to the server.

• Monitored logs for any connection errors and resolved them ...read more

Adding information to a table typically involves using SQL INSERT statements.

• Use the INSERT INTO statement to add new rows. Example: INSERT INTO table_name (column1, column2) VALUES (value1, value2);

• You can insert multiple rows at once. Example: INSERT INTO table_name (column1, column2) VALUES (value1, value2), (value3, value4);

• Ensure data types match the table schema to avoid errors.

• Use transactions for batch inserts to maintain data integrity.

10 commonly used Linux commands in daily work

• ls - list directory contents

• cd - change directory

• grep - search for a pattern in a file

• tail - display the last part of a file

• cat - concatenate and display files

• chmod - change file permissions

• sudo - execute a command as a superuser

• ps - display information about running processes

• kill - terminate a process

• ssh - connect to a remote server securely

Factors determining incident and outage priority

• Impact on business operations

• Urgency of the issue

• Number of users affected

• Potential financial loss

• SLA agreements

• Reputation damage

• Regulatory compliance requirements

Incident management focuses on resolving issues quickly to minimize impact, while problem management focuses on identifying and addressing root causes to prevent future incidents.

• Incident management is reactive, focusing on restoring services as quickly as possible.

• Problem management is proactive, focusing on identifying and addressing the root cause of incidents to prevent them from happening again.

• Incident management is typically handled by the support team, while problem m...read more

To check which file is taking up space in the system, you can use commands like du, df, and find.

• Use 'du' command to display disk usage of files and directories

• Use 'df' command to display disk space usage of file systems

• Use 'find' command to search for files based on size

Internal workflow for BFSI domain involves processes related to banking, financial services, and insurance.

• Customer onboarding and account setup

• Transaction processing and monitoring

• Risk management and compliance checks

• Customer support and issue resolution

• Data analysis and reporting

I will investigate the root cause of the crash, analyze logs, and work on resolving the issue to restore application functionality.

• Check application logs for error messages

• Identify the root cause of the crash

• Work with development team to troubleshoot and fix the issue

• Implement temporary workaround if needed

• Test the application thoroughly before restoring it to production

RDBMS stands for Relational Database Management System. It is a type of database management system that stores data in a structured format.

• Examples of RDBMS include MySQL, Oracle Database, SQL Server, PostgreSQL, and SQLite.

• RDBMS use tables to store data and relationships between different tables to organize data.

• They support SQL (Structured Query Language) for querying and managing data.

• ACID properties (Atomicity, Consistency, Isolation, Durability) are maintained in RDBMS t...read more

SQL clauses are used to perform specific actions in a SQL query.

• SELECT: retrieves data from a database

• FROM: specifies the table(s) to retrieve data from

• WHERE: filters the data based on specified conditions

• GROUP BY: groups the data based on specified columns

• HAVING: filters the grouped data based on specified conditions

• ORDER BY: sorts the data based on specified columns

• JOIN: combines rows from multiple tables based on related columns

• INSERT INTO: inserts new data into a table

• UPD...read more

Query to find maximum salary from EMP

• Use the MAX() function to find the maximum salary

• Specify the column name for salary in the SELECT statement

• Specify the table name and column name for salary in the FROM clause

No, main method in Java cannot be overridden.

• Main method is a static method of a class and cannot be overridden.

• Subclasses can have their own main method, but it will not be considered as the entry point of the program.

• Example: public class SubClass extends MainClass { public static void main(String[] args) { // This is not the entry point of the program }}

HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.

• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where the pair will be stored.

• If multiple key-value pairs hash to the same index, they are stored in a linked list at that index.

• To retrieve a value, the key is hashed again to find the corresponding index ...read more

To schedule a job in Linux, use the 'cron' utility to create a cron job.

• Use the 'crontab -e' command to edit the cron table for the current user.

• Specify the schedule for the job using the appropriate time and date format.

• Add the command or script to be executed at the scheduled time.

• Save and exit the cron table to activate the scheduled job.

SQL query to create a table with four parameters

• Use CREATE TABLE statement to create a new table

• Specify the table name and column names along with their data types

• Add any constraints or default values as needed

• Example: CREATE TABLE myTable (id INT, name VARCHAR(50), age INT, salary DECIMAL(10,2))

Use the sed command to replace a string in Unix

• Use the following syntax: sed 's/original_string/new_string/g' filename

• The 's' flag stands for substitute, 'g' flag stands for global (replace all occurrences)

• Example: sed 's/hello/goodbye/g' file.txt

I see a tree with green leaves, brown trunk, and branches extending outward.

• Green leaves

• Brown trunk

• Branches extending outward

Use the 'ls' command with the '-a' flag to find hidden files in Unix.

• Use the command 'ls -a' to list all files, including hidden files.

• Hidden files in Unix start with a dot (.) before the file name.

• Example: 'ls -a' will display all files, including hidden files.

JVM stands for Java Virtual Machine, it is a virtual machine that enables a computer to run Java programs.

• JVM is an abstract computing machine that enables a computer to run Java programs

• It provides a runtime environment in which Java bytecode can be executed

• JVM manages memory, provides security, and facilitates garbage collection

• It translates Java bytecode into machine code that can be executed by the computer's processor

In the BFSI domain, an asset refers to any valuable item owned by an individual or organization that can be converted into cash.

• Assets can include cash, investments, real estate, equipment, and intellectual property.

• In the banking sector, assets can also refer to loans given out to customers.

• Assets are important for financial institutions as they represent the value of the organization and its ability to generate revenue.

• Asset management is a key function in the BFSI domain t...read more

Types of indexes include clustered, non-clustered, unique, and composite indexes, each serving a different purpose in optimizing database performance.

• Clustered index: Physically reorders the data in the table based on the index key. Only one clustered index per table.

• Non-clustered index: Creates a separate structure for the index, containing the key columns and a pointer to the actual data rows.

• Unique index: Ensures that the indexed columns do not contain duplicate values.

• Com...read more

TRUNCATE, DROP, and DELETE are SQL commands used to remove data from a table, but they differ in their functionality.

• TRUNCATE is a DDL command that removes all rows from a table, but keeps the structure intact.

• DROP is a DDL command that removes an entire table, including its structure and data.

• DELETE is a DML command that removes specific rows from a table based on a condition.

• TRUNCATE is faster than DELETE as it doesn't generate any transaction logs.

• DROP is irreversible and ...read more