What are the trade-offs between strong consistency and eventual consistency in NoSQL databases?

  • Balanced latency and availability
  • High latency and low availability
  • Low latency and high availability
  • No impact on latency or availability
The trade-offs between strong consistency and eventual consistency in NoSQL databases involve choosing between low latency and high availability versus high consistency. Strong consistency ensures that all nodes see the same data at the same time, introducing higher latency and potential lower availability. On the other hand, eventual consistency prioritizes low latency and high availability, allowing nodes to have temporarily inconsistent data that will eventually converge.

Which of the following is NOT a commonly used partitioning method?

  • Hash partitioning
  • Merge partitioning
  • Range partitioning
  • Round-robin partitioning
Merge partitioning is not a commonly used partitioning method in database management. Range partitioning divides data based on specified ranges of values, hash partitioning distributes data using hash functions, and round-robin partitioning evenly distributes data across partitions without considering data characteristics.

What are some common challenges faced during conceptual schema design?

  • Ambiguous requirements
  • Indexing complexities
  • Query optimization issues
  • Schema normalization challenges
Common challenges in conceptual schema design include dealing with ambiguous requirements, where clarity is lacking. Clearing up ambiguities is crucial to ensure the final schema accurately reflects business needs.

A _______ dimension table in a Star Schema contains reference attributes.

  • Conformed
  • Degenerate
  • Fact
  • Slowly Changing
In a Star Schema, a Conformed dimension table contains reference attributes that are consistent and shared across multiple fact tables. This allows for uniformity in reporting and analysis, as the same dimension can be used across different parts of the data warehouse.

What does "CAP theorem" stand for in the context of NoSQL databases?

  • Centralized Architecture Paradigm
  • Common Access Protocol theorem
  • Concurrent Access Principle theorem
  • Consistency, Availability, Partition Tolerance
CAP theorem states that in a distributed system, it's impossible to achieve all three of Consistency, Availability, and Partition Tolerance simultaneously. Understanding CAP helps in making informed decisions when designing and selecting NoSQL databases for specific use cases.

A social media platform needs to store a vast amount of multimedia content, including images and videos. Discuss the considerations they should take into account when implementing compression techniques for this data.

  • Adaptive Compression
  • Image Compression
  • Lossy Compression
  • Video Compression
Considering the large volume of multimedia content, a social media platform should consider Lossy Compression. This method sacrifices some data to achieve higher compression ratios, making it suitable for non-critical content like images and videos where a slight loss in quality is acceptable for significant storage savings.

In Slowly Changing Dimensions (SCD), how does Type 4 handle historical data?

  • Adds new rows for each change
  • Creates separate tables for historical data
  • Overwrites existing historical records
  • Uses effective dating or versioning
Type 4 SCD handles historical data by using effective dating or versioning. Instead of adding new rows, it maintains the original row with an effective date or version number, allowing for a more compact representation of historical changes without cluttering the table with additional rows.

Which property of graph databases makes them particularly suitable for recommendation systems and social networks?

  • Ability to store large volumes of structured data
  • Native representation of relationships
  • Support for ACID transactions
  • Use of SQL as the query language
Graph databases are particularly suitable for recommendation systems and social networks due to their native representation of relationships. In a graph database, relationships are first-class citizens, making it efficient to traverse and analyze connections between entities, a key requirement in recommendation systems and social networks.

In clustering, data is organized into _______ based on shared characteristics.

  • Categories
  • Clusters
  • Hierarchies
  • Sets
In clustering, data is organized into clusters based on shared characteristics. Clusters are groups of data points that are similar to each other and dissimilar to data points in other clusters. This helps in discovering patterns and relationships within the data.

Partitioning helps in _______ the data across different storage devices or servers.

  • Clustering
  • Distributing
  • Indexing
  • Normalizing
Partitioning helps in Distributing the data across different storage devices or servers. This distribution enhances parallel processing capabilities and can lead to better utilization of resources in a database system.

In data partitioning, _______ is the process of redistributing data across partitions to ensure balanced loads.

  • Data fragmentation
  • Data migration
  • Data reallocation
  • Data shuffling
In data partitioning, data reallocation is the process of redistributing data across partitions to maintain balanced loads. This ensures that no single partition becomes a bottleneck, optimizing performance in distributed systems.

Scenario: A large e-commerce platform stores millions of product records in its database. To improve query performance, the database administrator decides to implement data partitioning based on product categories. What benefits can the company expect from this storage optimization strategy?

  • Enhanced data normalization
  • Improved data integrity
  • Increased data redundancy
  • Reduced query response time
By implementing data partitioning based on product categories, the e-commerce platform can expect reduced query response time. This is because data related to specific product categories is stored together, allowing for more efficient retrieval and improved overall system performance.