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Exam C2090-616 topic 1 question 38 discussion

Actual exam question from IBM's C2090-616
Question #: 38
Topic #: 1
[All C2090-616 Questions]

What is the primary use case for creating an index with the RANDOM option on a table?

  • A. Maximize performance with OLTP random key queries
  • B. Maximize performance when inserting into an expression based index containing the RAND() function
  • C. Minimize contention due to ascending key or descending key inserts, especially in a pureScale environment
  • D. Minimize hashing skew on a table in a multiple database partition environment, especially with column organized tables C
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Suggested Answer: Explanation 🗳️
by db2tester at Oct. 9, 2019, 10:57 a.m.

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db2tester
5 years, 1 month ago
The correct answer is "C. Minimize contention due to ascending key or descending key inserts, especially in a pureScale environment " DB2® Version 10.5 adds a type of random ordering for index key columns. Random ordering on index columns helps to alleviate page contention on frequently accessed pages in certain insert scenarios. This new function focuses specifically on index leaf pages that are accessed frequently in a DB2 pureScale® environment. See reference : https://www.ibm.com/support/knowledgecenter/en/SSEPGG_10.5.0/com.ibm.db2.luw.wn.doc/doc/c0060945.html
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