Why might a database administrator choose to denormalize a database?
- To optimize data storage and retrieval performance
- To reduce data redundancy and improve data consistency
- To reduce redundancy and improve data consistency
- To simplify the database structure and improve data integrity
A database administrator may choose to denormalize a database to optimize data storage and retrieval performance. Denormalization involves reducing the number of tables and increasing redundancy, which can speed up query performance, particularly in data warehousing where complex queries are common. However, it may come at the cost of some data integrity and consistency.
In a sales data model, which hierarchy is most likely to be used to analyze sales trends?
- Customer Hierarchy
- Location Hierarchy
- Product Hierarchy
- Time Hierarchy
In a sales data model, the Time Hierarchy is crucial for analyzing sales trends. It allows analysts to explore sales data over different time periods, such as daily, monthly, or yearly, to identify patterns, seasonality, and trends. This hierarchy helps in time-based analysis, forecasting, and decision-making.
In a top-down approach to building a data infrastructure, which is typically built first?
- Data Integration
- Data Marts
- Data Sources
- Data Warehouses
In a top-down approach to building a data infrastructure, data sources are typically the first components to be addressed. Data sources include various systems and databases that store raw data, and they need to be integrated and processed to feed into data warehouses and data marts. Starting with data sources is fundamental to ensuring data quality and consistency.
The process of cleaning and enhancing the data so it can be loaded into a data warehouse is known as what?
- Data Extraction
- Data Integration
- Data Loading
- Data Transformation
The process of cleaning, transforming, and enhancing the data to prepare it for loading into a data warehouse is called "Data Transformation." During this phase, data is cleansed, structured, and enriched to ensure its quality and consistency for analysis.
A strategy that involves making copies of the data warehouse at regular intervals to minimize data loss in case of failures is known as _______.
- Data Cleansing
- Data Erosion
- Data Purging
- Data Replication
Data replication is a strategy in data warehousing that involves creating copies of the data warehouse at regular intervals. This approach helps minimize data loss in case of failures by ensuring that there are up-to-date backup copies of the data readily available. Data replication is essential for data resilience and disaster recovery.
Your data warehouse system alerts show frequent memory overloads during peak business hours. What could be a maintenance strategy to address this?
- Add more data storage capacity
- Implement data partitioning
- Increase CPU processing power
- Upgrade network bandwidth
To address memory overloads in a data warehouse, implementing data partitioning is a strategic maintenance strategy. Data partitioning involves dividing large tables into smaller, more manageable segments. This can reduce the memory requirements and improve query performance during peak hours.
_______ is a technique used in data warehouses to determine the order in which data is physically stored in a table, often to improve query performance.
- Data Cleaning
- Data Clustering
- Data Modeling
- Data Sorting
Data clustering is a technique used in data warehouses to determine the physical order of data within a table. It is done to group similar data together, optimizing query performance by reducing the need to access scattered data.
A method used in data cleaning where data points that fall outside of the standard deviation or a set range are removed is called _______.
- Data Normalization
- Data Refinement
- Data Standardization
- Outlier Handling
Explanation:
In the context of data warehousing, what does the ETL process stand for?
- Efficient Transfer Logic
- Enhanced Table Lookup
- Extract, Transfer, Load
- Extract, Transform, Load
In data warehousing, ETL stands for "Extract, Transform, Load." This process involves extracting data from source systems, transforming it into a suitable format, and loading it into the data warehouse. Transformation includes data cleansing, validation, and structuring for analytical purposes.
In predictive analytics, what method involves creating a model to forecast future values based on historical data?
- Descriptive Analytics
- Diagnostic Analytics
- Prescriptive Analytics
- Time Series Forecasting
Time series forecasting is a predictive analytics method that focuses on modeling and forecasting future values based on historical time-ordered data. It is commonly used in various fields, including finance, economics, and demand forecasting.