Cognizant Senior Product Support Engineer Interview Questions and Answers

Major incident management involves identifying, prioritizing, and resolving critical issues to minimize impact on business operations.

• Establish a clear process for reporting and escalating major incidents.

• Prioritize incidents based on impact and urgency to ensure timely resolution.

• Communicate effectively with stakeholders to provide updates on incident status and resolution.

• Document incidents and resolutions for future...read more

SLA is a formal agreement between a service provider and a customer, while OLA is an agreement between different teams within the same organization.

• SLA is between a service provider and a customer, outlining the services provided, quality, responsibilities, etc.

• OLA is between different teams within the same organization, defining the interdependent relationships and responsibilities.

• SLA is external, OLA is internal.

• SLA...read more

Files in SSIS can be iterated using Foreach Loop Container or Script Task.

• Use Foreach Loop Container to iterate through a list of files in a specified directory.

• Set the Enumerator type to 'Foreach File Enumerator' and configure the necessary properties like file extension, file path, etc.

• Alternatively, use a Script Task to programmatically iterate through files and perform custom actions.

Checkpoint in SSIS is a feature that allows packages to restart from a specific point in case of failure.

• Checkpoints are used to save the state of the package at specific points during execution.

• They help in resuming package execution from the last successful checkpoint in case of failure.

• Checkpoints can be configured at the package level or at the task level.

• They are useful in scenarios where long-running packages nee...read more

SSIS expressions are used to dynamically set property values at runtime in SQL Server Integration Services packages.

• SSIS expressions are written using a combination of functions, operators, and constants.

• Expressions can be used to set properties such as connection strings, file paths, and SQL queries.

• Expressions can be used to make packages more flexible and reusable.

• For example, an expression can be used to dynamicall...read more

To list files, use command line tools like ls or dir.

• Use 'ls' command in Unix/Linux systems to list files in a directory

• Use 'dir' command in Windows systems to list files in a directory

• Add options like -l for detailed listing or -a to show hidden files

• Use wildcards like * to filter files based on patterns

grep is a basic pattern matching tool, while egrep is an extended version with more advanced pattern matching capabilities.

• grep is a basic command-line utility for searching plain-text data sets for lines that match a regular expression pattern.

• egrep is an extended version of grep that supports more advanced regular expression patterns.

• egrep is equivalent to grep -E, which enables extended regular expressions.

• egrep is ...read more

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...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.

• Concurren...read more

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 }}

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.

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