DBS-C01 Management and Operations Practice Question
Network Topology
The exhibit shows the output of a MySQL command run on an Amazon RDS for MySQL DB instance. The database is experiencing frequent checkpointing that is causing I/O spikes. The parameter innodb_log_file_size is currently 256 MB. Which change should be made to reduce checkpoint frequency?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the value of innodb_log_file_size to 1 GB.
Increasing innodb_log_file_size reduces checkpoint frequency by allowing more transactions to be logged before a checkpoint is forced. Option A is wrong because decreasing the log file size would increase checkpoint frequency. Option B is wrong because innodb_flush_log_at_trx_commit controls write-ahead logging durability, not checkpoint frequency. Option D is wrong because innodb_buffer_pool_size affects caching and memory, but does not directly reduce checkpoint frequency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Decrease the value of innodb_log_file_size to 128 MB.
Why it's wrong here
Decreasing innodb_log_file_size would cause more frequent checkpoints due to smaller redo log capacity, worsening I/O spikes.
- ✗
Set innodb_flush_log_at_trx_commit to 0.
Why it's wrong here
Setting innodb_flush_log_at_trx_commit to 0 improves performance by reducing durability, but does not affect checkpoint frequency.
- ✓
Increase the value of innodb_log_file_size to 1 GB.
Why this is correct
Increasing innodb_log_file_size to 1 GB allows the redo log to hold more transactions before a checkpoint is triggered, reducing checkpoint frequency and smoothing I/O.
- ✗
Increase the value of innodb_buffer_pool_size.
Why it's wrong here
Increasing innodb_buffer_pool_size increases memory for caching, but does not directly reduce checkpoint frequency; it may even cause more write operations over time.
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