Data Terms Advanced Quiz 2
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Quiz 2
1. What does the "CAP Theorem" state about distributed data stores?
A system can meet two of Consistency, Availability, Partition Tolerance
A system can only provide two out of three
Consistency requires giving up Availability or Partition Tolerance
2. What is "Eventual Consistency"?
All nodes eventually match if no updates occur
Data is deleted after each access
Transactions must finish within a set time
3. In distributed databases, what is a "Quorum"?
Max number of users allowed on a database
A type of encrypted password
Minimum nodes needed to approve an operation
4. What is the primary purpose of "Write-Ahead Logging" (WAL)?
Record changes before applying to ensure durability
Track which users are logged in
Improve server network performance
5. What characterizes a "Lambda Architecture"?
Only uses serverless functions
Combines batch and real-time layers
Uses symbolic column names in databases
6. What are "Vector Clocks" used for?
Measure distance between servers
Schedule backups across time zones
Track event order and detect conflicts
7. What is "Data Gravity"?
Large datasets attract more apps and services
Physical weight of server racks
Speed of data in pipelines
8. What is "Z-Ordering" in modern data formats?
Sort data alphabetically from Z to A
Map multi-dimensional data into one dimension
Remove old or unused data automatically
9. In a distributed context, what is "Split-Brain"?
Malware that fragments system memory
Two developers editing the same file
Cluster splits, each part thinking it is the master
10. What is "Multi-Region Replication"?
Store copies of data across multiple regions
Copy data between primary and foreign keys
Have separate executives in different countries
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