Hitachi Digital Services Data Engineer Interview Questions and Answers

Parity is calculated by counting the number of 1s in a binary sequence.

• Parity is used to detect errors in data transmission.

• Even parity means the number of 1s in the sequence should be even.

• Odd parity means the number of 1s in the sequence should be odd.

• Parity can be calculated using XOR operation on the binary sequence.

Baseline is the starting point of performance measurement while benchmark is the standard for comparison.

• Baseline is the initial measurement of performance used as a reference point for future comparisons.

• Benchmark is the standard or best practice used for comparison with the current performance.

• Baseline and benchmark are used to measure and improve performance.

• For example, a company may set a baseline for their websit...read more

I analyze logs, monitor system resources, and use profiling tools to identify and resolve performance issues.

• Analyze logs to identify potential bottlenecks

• Monitor system resources such as CPU, memory, and disk usage

• Use profiling tools to identify slow code and optimize it

• Identify and eliminate unnecessary database queries

• Optimize network communication

• Implement caching mechanisms

• Conduct load testing to identify performa

iSCSI, SAN, FC, MAA are protocols used in storage networking.

• iSCSI (Internet Small Computer System Interface) is a protocol used to transmit SCSI commands over IP networks.

• SAN (Storage Area Network) is a network that provides block-level access to data storage.

• FC (Fibre Channel) is a high-speed network technology used to connect servers and storage devices.

• MAA (Massive Array of Idle Disks) is a storage architecture tha

Top command displays real-time system resource usage and process information.

• Top command shows system load, CPU usage, memory usage, and running processes.

• The first line shows overall system statistics.

• The second line shows CPU usage.

• The third line shows memory usage.

• The fourth line shows swap usage.

• The fifth line shows running processes.

• Press 'q' to exit top command.