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Exam 1z0-084 topic 1 question 11 discussion

Actual exam question from Oracle's 1z0-084
Question #: 11
Topic #: 1
[All 1z0-084 Questions]

Multiple sessions are inserting data concurrently into a table that has an LOB column.
At some point in time, one of the sessions cannot find available space in the LOB segment and needs to allocate a new extent.
Which wait event will be raised in the other sessions that need space in the LOB column?

  • A. eng: SQ - contention
  • B. eng: TM - contention
  • C. eng: HW - contention
  • D. eng: TX - allocate ITL entry
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Suggested Answer: C 🗳️
by ScottL at Sept. 26, 2024, 3:29 p.m.

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cujar2003
3 months ago
Selected Answer: C
The HW enqueue is used to serialize the allocation of space beyond the high water mark of a segment. If lots of data is being added to an object concurrently, then multiple processes may be trying to allocate space above the high water mark at the same time, leading to contention.
upvoted 1 times
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ScottL
3 months, 2 weeks ago
SQ, Sequence Number Enqueue TM, DML Enqueue HW, High-Water Lock TX, Transaction
upvoted 1 times
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ScottL
3 months, 2 weeks ago
Selected Answer: C
The HW enqueue is used to serialize the allocation of space beyond the high water mark of a segment. If lots of data is being added to an object concurrently, then multiple processes may be trying to allocate space above the high water mark at the same time, leading to contention.
upvoted 2 times
...
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