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Advanced Data Modeling Quiz

S906: ScyllaDB University LIVE, 2024: Advanced Track Advanced Data Modeling Advanced Data Modeling Advanced Data Modeling Quiz

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Question 1 of 13

1. Question
What does LSM stand and how is it used in ScyllaDB?
- Log-Structured Merge-Tree, used for Scylla persistent storage
- Log-Structured Merge-Tree, used for High Availability
- Living Standards Measure, Scylla storage metrics
- Linux Security Modules, used by Scylla security functions
- Linux Software Map, text format used by Scylla configurations
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Question 2 of 13

2. Question
When is an SSTable created and updated? mark the wrong answers below (could be more than one)
- Created when MemTable is flushed to disk
- Created during compaction from other SSTables
- Updated as a result of a CQL UPDATE operation
- Updated as a result of a CQL DELETE operation
- SSTables are immutable, and once created are never updated
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Question 3 of 13

3. Question
Tombstones are markers for deleted values. How and when are Tombstones cleaned?
- Never. If they would a deleted value can come back to life
- Only on a major compaction
- On every minor compaction
- On compaction, but only after GC Grace Period
- During a repair
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Question 4 of 13

4. Question
What is the difference between Compaction Strategies?
- The order and way they select SSTable to compact
- The file format of the SSTable (mv, la, lk etc)
- The way they are using the GC Grace Period
- In the way, they sync and stream the data between Scylla nodes
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Question 5 of 13

5. Question
What are the ways to identify a large partition problem? (more than one answer)
- Using the large partition table
- nodetool cfstats
- nodetool repair
- nodetool cfhistograms
- nodetool describering
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Question 6 of 13

6. Question
Which of the following is a valid ScyllaDB data type? (more than one answer)
- Set
- List
- Map
- Hash
- Bag
- Array
- HashMap
- Vector
Correct

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Question 7 of 13

7. Question
What of the following is true about UDT – User Defined Types? (more than one answer)
- Can not be nested (one UDT inside the other)
- Can be nested (one UDT inside the other)
- Can not be part of a partition key
- Can not be part of a clustering key
- Always frozen
Correct

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Question 8 of 13

8. Question
Which of the following operation is supported for the vote Counter column below? (more than one answer)

CREATE TABLE vote_count (

id UUID PRIMARY KEY,

vote counter

);
- SET vote = vote + 1
- SET vote = vote + 2
- SET vote = vote – 1
- SET vote = 0
- SET vote = 100
- INC vote
- DEC vote
Correct

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Question 9 of 13

9. Question
Which of the following is true about counters in ScyllaDB? (more than one answer)
- You can *not* have more than one counter column in a table
- You can not have counter and non counters columns in a table
- You can not have counter and non counters columns in a table, expect the primary key columns
- You can create a Sec Index base on a counter column
- You can delete a counter and use it again later
Correct

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Question 10 of 13

10. Question
Consistency Level is controlled by
- The driver, per operation
- by driver, per session
- by the DB, per Keyspace
- by the DB, per table
- by the DB, per user
Correct

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Question 11 of 13

11. Question
Apache Cassandra drivers can be used with ScyllaDB
- Always
- Only for CQL
- Only for Thrift
- Only for Scylla 3.x and above
- Only when there is no Scylla Driver for the same PL
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Question 12 of 13

12. Question
Apache Cassandra “Smart Driver” can
- Connect directly to a coordinator that holds a replica of the data
- Work with more than on coordinator for the same request
- Compare the retrieve value with its internal cache
- Replace the coordinator, and consult all the replicas by itself
- Apply Heat weighted load balancing to choose the right replica
Correct

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Question 13 of 13

13. Question
ScyllaDB Java Driver, is different than Apache Cassandra driver because:
- Can work only with Scylla, not with Cassandra
- It is Shard aware, can connect to the right shard in a node
- Can apply Heat weighted load balancing to choose the right replica
- Can work with more than on coordinator for the same request
Correct

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