RELX Group Softwaretest Engineer Interview Questions and Answers

The reason for what?

• Need more context to provide a specific reason

• Could be related to a specific action, decision, outcome, etc.

• Can you provide more details or clarify the question?

A drawback is a disadvantage or limitation of a particular situation or course of action.

• Drawbacks can hinder progress or success in a project or task.

• They can be caused by limitations in resources, technology, or skills.

• Examples include lack of funding, outdated software, or inadequate training.

• Identifying drawbacks early on can help mitigate their impact on a project.

Fast forward is a feature that allows users to skip ahead in a video or audio file to a specific point.

• Fast forward allows users to quickly move forward in a video or audio file.

• Users can skip scenes or sections they are not interested in by using the fast forward feature.

• Commonly seen in media players, streaming services, and DVRs.

• Example: Pressing the fast forward button on a remote control to skip ahead in a movie.

A bloom filter in HBase is a data structure used to test whether a given element is a member of a set.

• Bloom filters are used to reduce the number of disk reads in HBase by quickly determining if a row may exist in a table.

• They are implemented as a compact array of bits, with multiple hash functions used to map elements to bits.

• Bloom filters can produce false positives but not false negatives, making them useful for pre...read more

Use dropDuplicates() function in pyspark to remove duplicate rows based on primary key.

• Use dropDuplicates() function on the DataFrame with the primary key column specified.

• Specify the subset parameter in dropDuplicates() to specify the primary key column.

• Example: df.dropDuplicates(['primary_key_column'])

SQL is a domain-specific language used for managing and manipulating relational databases.

• SQL stands for Structured Query Language

• It is used to communicate with databases to perform tasks such as querying data, updating data, and creating databases

• Performance tuning in SQL involves optimizing queries, indexes, and database design to improve speed and efficiency

• Examples of performance tuning techniques include using ind...read more