CGI Group Senior Data Engineer Interview Questions, Process, and Tips

Enhanced optimization in AWS Glue improves job performance by automatically adjusting resources based on workload

• Enhanced optimization in AWS Glue automatically adjusts resources like DPUs based on workload

• It helps improve job performance by optimizing resource allocation

• Users can enable enhanced optimization in AWS Glue job settings

Optimizing querying in Amazon Redshift involves proper table design, distribution keys, sort keys, and query optimization techniques.

• Use appropriate distribution keys to evenly distribute data across nodes for parallel processing.

• Utilize sort keys to physically order data on disk, reducing the need for sorting during queries.

• Avoid using SELECT * and instead specify only the columns needed to reduce data transfer.

• Use AN...read more

SQL statements are executed in a specific order to ensure accurate results.

• SQL statements are executed in the following order: FROM, WHERE, GROUP BY, HAVING, SELECT, ORDER BY.

• The FROM clause specifies the tables involved in the query.

• The WHERE clause filters the rows based on specified conditions.

• The GROUP BY clause groups the rows based on specified columns.

• The HAVING clause filters the groups based on specified condi...read more

Identifying root cause of slow executor compared to others

• Check resource utilization of the slow executor (CPU, memory, disk)

• Look for any specific tasks or stages that are taking longer on the slow executor

• Check for network latency or communication issues affecting the slow executor

• Monitor garbage collection and JVM metrics for potential bottlenecks

• Consider data skew or unbalanced data distribution causing slow perform