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PostgreSQL High Availability & Replication Mastery Hub: The

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Q1Domain Verified
In PostgreSQL streaming replication, what is the primary mechanism by which the primary server sends WAL (Write-Ahead Log) records to standby servers?
Direct database connection for record-by-record transfer.
WAL sender processes on the primary communicating with WAL receiver processes on the standby.
WAL archiving to a shared network file system.
Asynchronous replication of complete data files.
Q2Domain Verified
When configuring synchronous replication in PostgreSQL, what is the key role of the `synchronous_commit` parameter on the primary server in ensuring data consistency across replicas?
It dictates the frequency of WAL file archival to disk.
It controls the network buffer size for WAL record transmission.
It determines how many standby servers must acknowledge a transaction commit before the primary considers it committed.
It sets the maximum latency allowed between the primary and standby servers.
Q3Domain Verified
Consider a scenario where a primary PostgreSQL server is experiencing high write loads and a standby server is lagging significantly behind in applying WAL records. Which of the following would be the MOST effective immediate action to improve the standby's catch-up performance in a streaming replication setup?
Optimize queries on the primary to reduce write volume.
Temporarily switch to physical replication using base backups.
Increase the `wal_level` parameter on the primary to `minimal`.
Increase the `max_wal_senders` parameter on the primary.

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This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

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