QUICK HEAL TECHNOLOGIES Interview Questions, Process, and Tips for Experienced

Use the input() function in Python to take input from the user.

• Use the input() function to prompt the user for input and store the input in a variable.

• You can specify a prompt message inside the input() function to guide the user on what to input.

• The input() function always returns a string, so you may need to convert the input to the desired data type if needed.

Use GROUP BY and HAVING clause to fetch duplicate records from a table

• Use GROUP BY clause to group records with same values

• Use HAVING clause to filter out groups with count greater than 1

• Example: SELECT column_name, COUNT(column_name) FROM table_name GROUP BY column_name HAVING COUNT(column_name) > 1

IPC mechanism in Windows allows communication between processes through shared memory, message passing, and synchronization.

• IPC mechanisms in Windows include named pipes, mailslots, shared memory, and sockets.

• Named pipes allow communication between processes on the same machine or over a network.

• Mailslots are used for one-way interprocess communication.

• Shared memory allows processes to share data by mapping a region of...read more

Multi-threading in Windows allows multiple threads to run concurrently within a single process.

• Windows provides APIs like CreateThread and CreateProcess to create and manage threads.

• Threads share the same memory space within a process, allowing for efficient communication and resource sharing.

• Windows supports both user-mode and kernel-mode threads, with user-mode threads being more lightweight.

• Synchronization mechanism...read more

Memory mapping in Windows allows files to be mapped directly into memory for faster access and manipulation.

• Memory mapping allows files to be accessed as if they were in memory

• File mapping can be used for sharing data between processes

• Improves performance by reducing disk I/O operations

• Examples: CreateFileMapping, MapViewOfFile, UnmapViewOfFile

Critical section in Windows is a synchronization mechanism used to protect shared resources from concurrent access.

• Critical sections are used to ensure mutual exclusion between threads accessing shared resources.

• They are implemented using the Windows API functions InitializeCriticalSection, EnterCriticalSection, and LeaveCriticalSection.

• Critical sections are more efficient than mutexes for synchronization within a sing...read more