DBS-C01 Deployment and Migration Practice Question
A company is migrating a self-managed PostgreSQL database to Amazon Aurora PostgreSQL. They want to use the pglogical extension for logical replication to minimize downtime. Which THREE prerequisites must be met before setting up pglogical?
⚠ Common exam trap
Watch out — candidates often confuse the prerequisites for pglogical with those for native PostgreSQL logical replication, which also requires max_replication_slots and max_wal_senders to be set, but pglogical does not mandate a specific value like 10 for max_wal_senders.
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
✓
Add pglogical to shared_preload_libraries and restart the source database
Pglogical must be loaded into the shared preload libraries on the source PostgreSQL instance so that it is available at server start. Without this, the extension cannot be installed or used. The database must be restarted after modifying shared_preload_libraries for the change to take effect.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Add pglogical to shared_preload_libraries and restart the source database
Why this is correct
The extension must be loaded.
- ✓
Set wal_level to logical in the source PostgreSQL configuration
Why this is correct
Logical replication requires wal_level=logical.
- ✗
Configure max_wal_senders to at least 10
Why it's wrong here
Not a specific prerequisite for pglogical.
- ✗
Enable track_commit_timestamp on the source
Why it's wrong here
Not required for pglogical.
- ✓
Ensure the source PostgreSQL version is 9.4 or later
Why this is correct
pglogical supports PostgreSQL 9.4+.
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