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Dell EMC D-XTR-DS-A-24 Exam - Topic 4 Question 28 Discussion

What should the Oracle Redo Log block size be set to in order to prevent log entries from being misaligned by read-modify-write operations for an Oracle database?
B) 8 kB
A) 16 kB
C) 4 kB
D) 24 kB

Dell EMC D-XTR-DS-A-24 Exam - Topic 4 Question 28 Discussion

Actual exam question for Dell EMC's D-XTR-DS-A-24 exam
Question #: 28
Topic #: 4
[All D-XTR-DS-A-24 Questions]

What should the Oracle Redo Log block size be set to in order to prevent log entries from being misaligned by read-modify-write operations for an Oracle database?

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Suggested Answer: B

The Oracle Redo Log block size is recommended to be set to 8 kB. This is based on the best practices for Oracle 19c Database, where it was found that increasing the size of the Oracle redo logs can improve database performance12. However, it's important to note that not every workload will show significant performance increase when increasing the size of the redo logs. Customers should evaluate the AWR to determine if the redo logs have an associated high number and duration of wait times. If the redo logs show a possible bottleneck, then increasing the size of the redo logs could improve performance2.


by Werner at Aug 12, 2025, 08:03 PM

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Kattie
7 months ago
Wait, 24 kB? That seems way too high!
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Tran
7 months ago
I thought 16 kB was the standard?
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Goldie
7 months ago
It should be 8 kB to avoid misalignment.
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Veta
7 months ago
Definitely 4 kB, that's what I've always used.
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Andra
8 months ago
I agree, 8 kB is the sweet spot for performance.
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Serita
8 months ago
I vaguely recall that 24 kB might be too large for redo logs, but I can't remember the exact reasoning behind it.
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Nakisha
8 months ago
I’m a bit confused; I thought 4 kB was the default size for many databases, but I’m not sure if that applies here.
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Willard
8 months ago
I remember practicing a similar question, and I feel like 16 kB was mentioned as a good option for performance.
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Phyliss
8 months ago
I think the block size should be 8 kB, but I'm not entirely sure if that's the standard for preventing misalignment.
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Octavio
9 months ago
This seems straightforward. The redo log block size needs to be aligned with the storage to prevent read-modify-write problems. I'm pretty confident 16 kB is the right answer here.
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Jesusita
9 months ago
Based on my understanding, the redo log block size should be set to a value that matches the underlying storage's block size to avoid any potential issues. I'm leaning towards 8 kB, but I'll double-check my reasoning.
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Edda
9 months ago
I'm a bit confused on this one. What exactly are the implications of misaligned redo log entries? I'll need to review my notes to make sure I understand the concept fully.
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Devora
9 months ago
Okay, I remember learning about redo logs in class. I think the key here is to choose a block size that aligns with the underlying storage to prevent misalignment issues.
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Rosann
9 months ago
Hmm, this seems like a tricky one. I'll need to think carefully about the relationship between redo log block size and read-modify-write operations.
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Gertude
10 months ago
But wouldn't a smaller block size like 4 kB be more efficient for read-modify-write operations?
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Dorsey
11 months ago
I'm going with 8 kB. It's a nice, even size and should work well for most Oracle databases.
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Jesusita
10 months ago
I think 8 kB is a good choice too.
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Timothy
11 months ago
I disagree, I believe it should be set to 16 kB to prevent misalignment.
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Domingo
11 months ago
Hmm, I think the redo log block size should be set to 16 kB. It's the largest option and should prevent alignment issues, right?
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Chery
10 months ago
I think the redo log block size should be set to 16 kB.
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Gertude
11 months ago
I think the Oracle Redo Log block size should be set to 8 kB.
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