Which type of database, between traditional RDBMS and columnar databases, is typically better for OLTP (Online Transaction Processing) operations?
- Both are equally suitable
- Columnar Database
- Neither is suitable for OLTP
- Traditional RDBMS
Traditional RDBMS (Relational Database Management Systems) are typically better suited for OLTP (Online Transaction Processing) operations, which require fast and efficient handling of numerous small, concurrent transactions.
For an organization that requires immediate insight into business operations, which type of BI would be most appropriate?
- Analytical BI
- Operational BI
- Strategic BI
- Tactical BI
For an organization needing immediate insights into real-time business operations, Operational Business Intelligence (Operational BI) is most suitable. Operational BI focuses on monitoring and analyzing current data to support daily decision-making and operational activities. It provides up-to-the-minute information for faster response.
A business analyst is trying to analyze monthly sales data for the past three years. She wants to view sales by year, quarter, month, and day. What concept will aid her in viewing data at these different granularities?
- Data Modeling
- Data Normalization
- Data Warehousing
- Dimensional Modeling
Dimensional modeling is a technique used in data warehousing that enables the analysis of data at different granularities, such as year, quarter, month, and day. It involves creating fact tables and dimension tables to represent data hierarchies, facilitating efficient querying and reporting.
The design in which dimension tables are normalized, resulting in the formation of a structure that resembles a snowflake is called _______ schema.
- Constellation
- Galaxy
- Snowflake
- Star
A snowflake schema is a design approach in data warehousing where dimension tables are normalized to reduce data redundancy. This leads to a structure that resembles a snowflake due to the multiple related tables. It can help save storage space and improve data integrity but may require more complex queries.
_______ is a popular open-source ETL tool that can integrate with various data storage platforms.
- Excel
- Hadoop
- SQL Server
- Talend
Talend is a widely used open-source ETL tool known for its flexibility and ability to integrate with various data storage platforms. It allows organizations to efficiently extract, transform, and load data from diverse sources into a unified data warehouse or data lake.
In a logical model, the relationship between two entities where one occurrence of entity A can relate to many occurrences of entity B, and vice versa, is termed as _______.
- Many-to-Many Relationship
- Many-to-One Relationship
- One-to-Many Relationship
- One-to-One Relationship
In a logical model, a many-to-many relationship represents a situation where one occurrence of entity A can be associated with many occurrences of entity B, and vice versa. This is typically used to model complex relationships between entities.
What is the primary goal of Business Intelligence (BI)?
- Generating Reports
- Managing Payroll
- Predicting Future Profits
- Providing Data Insights
The primary goal of Business Intelligence (BI) is to provide data insights and support decision-making. BI systems gather, process, and analyze data to help organizations gain a deeper understanding of their business and make informed choices based on data-driven insights.
After profiling a dataset, a data analyst discovers that multiple columns have the same values in the same order, but with different column names. What should be the next step in the data cleaning process?
- Combine the columns into a single column
- Drop one of the columns
- Leave them as they are
- Rename the columns to have the same name
In this situation, you should rename the columns to have the same name. It ensures consistency and clarity in the dataset, making it easier to work with. This step is crucial for data integration and analysis as it avoids redundancy and confusion that might arise from having multiple column names for the same data.
In the context of ERP, what is the primary challenge of "data silos"?
- Data accessibility and integration
- Data backup
- Data security
- Efficient data storage
The primary challenge of "data silos" in the context of ERP (Enterprise Resource Planning) is ensuring that data is accessible and integrated across various departments and modules within the organization. Data silos result in isolated information that can hinder effective decision-making and collaboration. Integrating data from different sources is essential for ERP to deliver its full benefits.
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.