23 Questions
What is the primary purpose of metadata maintenance?
To document the development process of a DW system
What is a common technique used in MySQL for data deletion?
All of the above
What is the primary goal of data archiving in a DW system?
To preserve historical data
What is a characteristic of data refresh in small-scale data warehouses?
It replaces complete data content
What is the purpose of E(C)TL software?
To support data transformation
What is the purpose of metadata administration?
To define responsibilities over metadata
What is a characteristic of data refresh using transaction logs?
It is performed in recovery mode
Which of the following is NOT a type of inconsistency in data?
Inconsistencies in data security protocols
What is the primary purpose of data transformation?
To clean and transform data for analysis
What type of tool is commonly used for data migration?
Data migration tool
What is the benefit of creating a time dimension before loading data into a data warehouse?
It enables more accurate data analysis
What is the primary goal of data cleaning?
To remove inconsistencies and errors from data
Which of the following is an example of data scrubbing?
All of the above
What is the purpose of ETL processes?
To transform and load data into a data warehouse
What type of tool is Pentaho Data Integration?
ETL tool
What is the primary goal of metadata protection in a Data Warehouse system?
To ensure security and safety of the metadata
Which of the following user roles is responsible for implementing system security policies in a Data Warehouse system?
Operational administrators
What is the primary purpose of ETL processes in a Data Warehouse system?
To convert OLTP data into DW data
Which of the following is NOT a component of metadata in a Data Warehouse system?
End user reports
What is the primary goal of creating a Data Warehouse system from available sources?
To integrate data from multiple sources for analysis and reporting
Which of the following is a benefit of using OLAP and Data Mining tools in a Data Warehouse system?
Enhanced data analysis and decision-making
What is the primary role of designers and programmers in a Data Warehouse system?
Creating and maintaining project specifications
What is the primary difference between an OLTP database and a Data Warehouse system?
Data integration and aggregation capabilities
Study Notes
Roles and Access Rights in Data Warehousing
- Three types of metadata users in a DW system: designers/programmers, operational administrators, and end users
- Designers/programmers have permissions for creating and maintaining project specifications
- Operational administrators have permissions for maintaining the DW system architecture, executing ETL processes, and implementing system security policies
- End users (e.g. managers) have permission to use reporting, OLAP, and Data Mining tools
Metadata Maintenance
- Metadata contains detailed descriptions of DW system architectures, schema, data sources, ETL processes, administrative procedures, reports, and methods/tools for OLAP and Data Mining
- Metadata is important for security and safety, and is maintained through the ETL process and monitoring of data in the DW database
Data Refresh
- Four methods of data refresh: replacing complete data, comparing instances to the previous refresh, using time-stamped differences, and using transaction logs
- Data refresh is necessary for maintaining the integrity and accuracy of the DW system
Data Archiving and Deletion
- Data archiving is necessary for preserving old data and ensuring restoration and potential recovery of the DW system
- Data deletion is necessary for removing unnecessary data and is commonly done using TRUNCATE TABLE, DELETE FROM, and ALTER TABLE commands in MySQL
Metadata Administration
- Metadata administration involves defining responsibilities over metadata and procedures
- Includes ETL processes, formatting of data, and resolving inconsistencies in data types, lengths, and logical conditions
Data Transformation
- Data transformation involves cleaning and transforming data to make it consistent and reliable
- Common tools used for data transformation include Pentaho Data Integration and ECTL
- Data transformation is necessary to resolve inconsistencies in data, including inconsistent data types, lengths, and logical conditions, as well as missing data
Define roles and access rights in a data warehouse system, including designers, programmers, operational administrators, and end users. Learn about metadata protection and security.
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