Intelliswift - An LTTS Company Database Admin Interview Questions, Process, and Tips

To setup a new Cassandra Datacenter, follow these steps:

• Choose a location for the new datacenter

• Install Cassandra on the new nodes

• Configure the new nodes to join the existing cluster

• Update the replication factor for the new datacenter

• Test the new datacenter for performance and reliability

Bloom Filter is a probabilistic data structure used to test whether an element is a member of a set.

• Bloom Filter uses a bit array and multiple hash functions to store and check for the presence of elements in a set.

• It can return false positives but never false negatives.

• It is commonly used in caching, spell checking, and network routers.

• Example: A Bloom Filter can be used to check if a URL has already been visited to a

Reads and writes happen through input/output operations between the database and the application.

• Data is read from the database and transferred to the application for processing.

• Data is written to the database from the application after processing.

• Reads and writes are performed through SQL statements or APIs.

• The database management system manages the read and write operations.

• Concurrency control mechanisms ensure data

Compaction strategies are used to optimize database performance by reducing disk space usage.

• Leveled compaction

• Size-tiered compaction

• Time-window compaction

• Date-tiered compaction

• Tiered compaction

High CPU issue can be resolved by identifying the root cause and optimizing the system accordingly.

• Identify the process or application causing high CPU usage

• Check for any background processes or services consuming CPU resources

• Optimize the system by upgrading hardware, tweaking system settings, or optimizing code

• Consider load balancing or scaling out if the issue persists

• Monitor system performance regularly to prevent

High memory issue can be resolved by identifying and optimizing memory-intensive processes.

• Identify memory-intensive processes using task manager or performance monitor

• Optimize memory usage by closing unnecessary programs and services

• Increase virtual memory or add more RAM if necessary

• Check for memory leaks in applications and fix them

• Consider upgrading hardware if issue persists

To improve db performance, optimize queries, use indexes, and regularly maintain the database.

• Optimize queries by avoiding unnecessary joins and subqueries

• Use indexes to speed up data retrieval

• Regularly maintain the database by cleaning up unused data and optimizing table structures

• Consider partitioning large tables to improve query performance

• Use caching to reduce the number of database queries

• Upgrade hardware or cons...read more