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Exam C2090-600 All Questions

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Exam C2090-600 topic 1 question 3 discussion

Actual exam question from IBM's C2090-600
Question #: 3
Topic #: 1
[All C2090-600 Questions]

Which of the following statements about compression for BLU MPP tables is TRUE?

  • A. Compression must be explicitly enabled for BLU MPP tables
  • B. Compression requires decompression to evaluate partition joins
  • C. Unique compression dictionaries are generated for each partition
  • D. Each table has a single compression dictionary that gets replicated across all partitions
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Suggested Answer: D 🗳️
Reference:
http://www.idug.org/p/bl/et/blogaid=503
by db2tester at Nov. 19, 2019, 3:26 p.m.

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db2tester
5 years ago
The answer A is wrong because the columns are automatically compressed with DB2 Blu technology.
upvoted 1 times
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db2tester
5 years ago
The answer D is correct. Indeed, “Actionable compression” is the term IBM uses for the compression that is applied to each column – it uses frequency-based compression (Huffman coding) and other techniques to achieve very high compression ratios. It is “actionable” because predicates can be applied to the column without uncompressing the data. With multi-partition tables, DB2 does not generate unique compression dictionaries for each partition – each table has a single dictionary that is replicated across all database partitions. This ensures that DB2 does not have to uncompress the table’s data when sending data between partitions.
upvoted 1 times
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