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PCDE Practice Question: Manage a solution that can span multiple database technologies

You are monitoring Cloud Bigtable replication lag. Which metric should you use to determine if replicas are up to date, and what consistency level is typical for Bigtable replication?

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

Use 'replication_lag' metric; consistency is eventually consistent.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • Use 'replication_lag' metric; consistency is eventually consistent.

    Why this is correct

    Bigtable replication is asynchronous and eventually consistent; the 'replication_lag' metric measures the delay.

  • Use 'cluster_lag' metric; consistency is read-your-writes consistent.

    Why it's wrong here

    No such metric; read-your-writes is not guaranteed.

  • Use 'replica_lag' metric; consistency is strongly consistent.

    Why it's wrong here

    The metric is 'replication_lag' not 'replica_lag', and consistency is eventually consistent.

  • Use 'replication_lag' metric; consistency is strongly consistent.

    Why it's wrong here

    Bigtable replication does not provide strong consistency.

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Last reviewed: Jul 4, 2026

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