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Big data Storage & retrieval

Quiz by Johan De Gelas

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19 questions
Show answers
  • Q1
    What are the two fundamental operations that a database needs to perform?
    Store data and delete data
    Sort data and analyze data
    Store data and retrieve data
    Retrieve data and back up data
    30s
  • Q2
    How does the db_get function perform lookups?
    It scans the entire database file
    It retrieves data from a cache
    It queries a separate database
    It uses an index
    30s
  • Q3
    What does an index do in a database?
    It stores backup data
    It compresses the data
    It acts as a signpost to locate data efficiently
    It sorts the data
    30s
  • Q4
    What are two main approaches to indexing in databases?
    B-trees and log-structured storage
    Row-oriented and column-oriented
    Heap and stack memory
    Relational and non-relational
    30s
  • Q5
    What does LSM-tree stand for?
    Large Storage Medium Tree
    Last Structured Memory Tree
    List-Structured Merge Tree
    Log-Structured Merge Tree
    30s
  • Q6
    What is a significant advantage of column-oriented storage?
    Faster transaction processing
    Easier data backups
    Efficiently loading and querying specific columns
    Simpler data retrieval
    30s
  • Q7
    What is the purpose of indexing in databases?
    To perform backups of the database
    To maintain data integrity
    To store data in a compressed format
    To improve the speed of data retrieval operations
    30s
  • Q8
    What trade-off exists when using indexes in a database?
    Indexes make reads faster but decrease the overall data size
    Indexes require more disk space but improve compression
    Indexes ensure data integrity but slow down reads
    Indexes speed up reads but slow down writes.
    30s
  • Q9
    What does an SSTable (Sorted String Table) format require?
    The keys must be unique within each segment
    The data must be stored in binary format
    The sequence of key-value pairs must be sorted by key.
    The values can be duplicated
    30s
  • Q10
    In what way do B-trees handle modifications to the database?
    They store all data in memory
    They allow in-place updating of pages on disk.
    They only allow appending new data
    They require all data to be sorted in advance
    30s
  • Q11
    How do LSM-trees (Log-Structured Merge-Trees) improve write performance?
    They only write data during off-peak hours
    They sequentially write compact SSTable files rather than overwriting pages.
    They require fewer disk accesses for reads
    They store all data in memory to avoid disk writes
    30s
  • Q12
    What are the two primary functions a database must perform at its most fundamental level?
    Store data and retrieve data.
    Optimize queries and manage transactions.
    Store data and process data.
    Retrieve data and analyze data.
    30s
  • Q13
    What are the two families of storage engines discussed that are used in traditional relational and NoSQL databases?
    Graph databases and object-oriented databases.
    Binary trees and hash maps.
    Indexed storage systems and flat file systems.
    Log-structured storage engines and page-oriented storage engines.
    30s
  • Q14
    What is the main advantage of using an index in a database?
    It increases data redundancy.
    It speeds up read queries.
    It minimizes storage space.
    It simplifies data structure.
    30s
  • Q15
    What does the term 'compaction' mean in the context of log-structured storage?
    It refers to compressing data to save space.
    It is an optimization step for query execution.
    It involves removing duplicate keys and merging segments.
    It indicates the process of splitting large files.
    30s

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