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What is the term for a collection of databases scattered across multiple sites over a network?
What is the term for a collection of databases scattered across multiple sites over a network?
Which type of database is spread over different sites and is not limited to one system?
Which type of database is spread over different sites and is not limited to one system?
What type of transparency allows users to access any table or fragment as if it is stored locally?
What type of transparency allows users to access any table or fragment as if it is stored locally?
In data integration within a distributed database, what do you call the transformations between related objects?
In data integration within a distributed database, what do you call the transformations between related objects?
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What is the schema process called that identifies when two objects are semantically related?
What is the schema process called that identifies when two objects are semantically related?
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Which type of database system is located on various sites without sharing physical components?
Which type of database system is located on various sites without sharing physical components?
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What type of database system has all different sites storing databases identically?
What type of database system has all different sites storing databases identically?
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What kind of database system allows different sites to use varying schemas and software?
What kind of database system allows different sites to use varying schemas and software?
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Which operator is effective in reducing total data transmission in distributed query processing?
Which operator is effective in reducing total data transmission in distributed query processing?
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What operation can be used to rebuild a table from vertical fragments?
What operation can be used to rebuild a table from vertical fragments?
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In horizontal fragmentation, which operation can be performed on the fragments to construct a table?
In horizontal fragmentation, which operation can be performed on the fragments to construct a table?
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What is true about the global conceptual schema in logical integration?
What is true about the global conceptual schema in logical integration?
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What is the process of assigning data fragments to specific sites in a distributed system called?
What is the process of assigning data fragments to specific sites in a distributed system called?
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What term describes the intelligent distribution of data fragments for improved performance?
What term describes the intelligent distribution of data fragments for improved performance?
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When data is updated by a user, and this update reflects in all tables across multiple sites, this is known as?
When data is updated by a user, and this update reflects in all tables across multiple sites, this is known as?
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What process involves creating and maintaining multiple copies of data at different sites?
What process involves creating and maintaining multiple copies of data at different sites?
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What is the first type of optimization performed in query optimization?
What is the first type of optimization performed in query optimization?
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The second type of optimization in query optimization occurs at which level?
The second type of optimization in query optimization occurs at which level?
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Which of the following is a primary driver for local database execution?
Which of the following is a primary driver for local database execution?
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What do nearly all global optimization alternatives overlook?
What do nearly all global optimization alternatives overlook?
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In query optimization, which cost is considered dominant compared to local processing?
In query optimization, which cost is considered dominant compared to local processing?
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Which type of cost is deemed important in query optimization?
Which type of cost is deemed important in query optimization?
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What is a tree data structure that represents a relational algebra expression called?
What is a tree data structure that represents a relational algebra expression called?
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What does a query tree specifically represent?
What does a query tree specifically represent?
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What is the process of dividing a database into various sub-tables for efficient storage called?
What is the process of dividing a database into various sub-tables for efficient storage called?
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Which of the following ensures that fragments can reconstruct the original relation?
Which of the following ensures that fragments can reconstruct the original relation?
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What type of integration occurs in a distributed database where various sub-tables of the database are utilized?
What type of integration occurs in a distributed database where various sub-tables of the database are utilized?
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What aspect of cost differentiates query processing in DDBMS from that in centralized DBMS?
What aspect of cost differentiates query processing in DDBMS from that in centralized DBMS?
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In physical integration, what must the integrated database be to ensure proper configuration?
In physical integration, what must the integrated database be to ensure proper configuration?
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Which tools aid in the integration of a distributed database system?
Which tools aid in the integration of a distributed database system?
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In query trading algorithms for distributed database systems, what is the controlling site for a query referred to as?
In query trading algorithms for distributed database systems, what is the controlling site for a query referred to as?
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What type of operations should be performed at the site where most fragmented data is present?
What type of operations should be performed at the site where most fragmented data is present?
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Which term refers to the replicas converging to the same value?
Which term refers to the replicas converging to the same value?
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Which method requires the availability of lock managers at each site?
Which method requires the availability of lock managers at each site?
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In a centralized protocol, lock requests are issued to which entity?
In a centralized protocol, lock requests are issued to which entity?
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What do we refer to the transaction manager at the originating site in a distributed database system?
What do we refer to the transaction manager at the originating site in a distributed database system?
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Which approach guarantees that deadlocks cannot occur in the first place?
Which approach guarantees that deadlocks cannot occur in the first place?
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What is defined as the probability that a system does not experience failures over a specific time frame?
What is defined as the probability that a system does not experience failures over a specific time frame?
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What describes the probability that a system operates according to its specifications at a given point in time?
What describes the probability that a system operates according to its specifications at a given point in time?
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Which approach to managing deadlocks is the most popular in a distributed environment?
Which approach to managing deadlocks is the most popular in a distributed environment?
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What type of data requires a different algorithm and longer analysis time?
What type of data requires a different algorithm and longer analysis time?
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How does big data contribute to cost savings for organizations?
How does big data contribute to cost savings for organizations?
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What benefit does big data provide by enabling analysis of large datasets efficiently?
What benefit does big data provide by enabling analysis of large datasets efficiently?
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In what way does big data assist in marketing efforts?
In what way does big data assist in marketing efforts?
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How does big data help businesses tailor marketing strategies?
How does big data help businesses tailor marketing strategies?
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What advantage does big data provide with regards to consumer behavior insights?
What advantage does big data provide with regards to consumer behavior insights?
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Which of the following benefits relates to the speed of customer engagement through big data?
Which of the following benefits relates to the speed of customer engagement through big data?
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What is a significant feature of large datasets analyzed in big data?
What is a significant feature of large datasets analyzed in big data?
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Study Notes
Distributed Database Systems - Oral Bank (Unsolved)
- Oral bank questions cover distributed database systems concepts, specifically focusing on distributed database systems, data integration, fragmentation, and query processing.
- Multiple choice questions assess understanding of key terms, concepts, and techniques in the field.
- Questions explore different fragmentation strategies (horizontal, vertical, hybrid) and how they relate to the distribution of data across multiple sites.
- The exam tests understanding of how to integrate databases and their related transformations and query processes.
- Concepts and algorithms relating to distributed database systems, such as fragmentation and allocation, are examined within the context of real-world applications and database design.
- Deadlocks within distributed databases and solutions to prevent or resolve them are also covered.
Distributed Database Systems - Concepts
- Distributed Database System: A collection of databases spread across multiple sites on a network.
- Centralized Database System: A database system located on a single site.
- Data Transparency: Ability of a user to access data located at any site like local data.
- Fragmentation: Dividing a relation into smaller schemas.
- Horizontal Fragmentation: Dividing a relation into disjoint groups of tuples based on a condition applied to tuples.
- Vertical Fragmentation: Dividing a relation into disjoint groups of attributes.
- Hybrid Fragmentation: Combining horizontal and vertical fragmentation strategies.
- Mapping: Transforming objects between different schemas.
- Matching: Identifying semantically equivalent objects.
- Modelling: Defining objects in a way that enables appropriate relationships between semantically equivalent objects.
- Data Replication: Creating copies of data at multiple sites.
- Location Transparency: Users can access data without knowing its exact physical location.
- Query Optimization: Techniques to improve query efficiency in distributed database systems.
- Query Execution: Executing queries across multiple sites in a distributed database.
- Data Allocation: Distributing data fragments across different sites.
Query Processing in Distributed DBMS
- Query Tree: A tree-structured representation of a query, used in query processing in a distributed database system.
- Data Transfer Costs: Costs involved in transferring data across a network.
- Local Query Optimization: Optimizing queries at individual sites.
- Global Query Optimization: Optimizing queries across multiple sites.
- Query Trading: Algorithm used for distributing queries amongst sites in a distributed manner.
- Communication overhead: Overhead of data transfer and communication between different sites.
- Local level optimization: Minimizing query processing time at each individual site.
- Global level optimization: Optimizing queries across all sites involved.
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Description
Test your knowledge on distributed database systems through this quiz that covers key concepts such as data integration, fragmentation strategies, and query processing. Dive into real-world applications and explore how to handle deadlocks in distributed environments. Assess your understanding with multiple choice questions focused on critical terms and techniques in the field.
