Question 1,108 of 1,446
PCDE Migrate data solutions Practice Question
A company is migrating a 2 TB PostgreSQL database to AlloyDB using Database Migration Service. They need to minimize downtime. After the initial full dump, the CDC lag remains high for hours. What should the engineer check first?
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
✓
Source database resource utilization (CPU, IO)
High CDC lag often indicates resource constraints on the source or network bandwidth. Source database performance (CPU, IO) impacts replication speed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cloud SQL Auth Proxy configuration
Why it's wrong here
Auth Proxy is for connectivity, not replication lag.
- ✗
Binary log retention period
Why it's wrong here
PostgreSQL uses WAL, not binary logs; retention may be relevant but source resource is first check.
- ✓
Source database resource utilization (CPU, IO)
Why this is correct
High source utilization can slow down log reading and replication.
- ✗
AlloyDB cluster size
Why it's wrong here
AlloyDB is the destination; lag is typically caused by source or network.
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Last reviewed: Jul 4, 2026
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