ARA-C01 Snowflake Architecture Practice Question
A database architect needs to design a high-churn table that receives millions of updates daily. To minimize storage costs associated with Fail-safe and Time Travel while maintaining some recovery capability, which table type and configuration should be used?
⚠ Common exam trap
Candidates often assume that Transient tables lack any recovery capability, ignoring that they still support Time Travel (up to 1 day), which is sufficient for most short-term recovery needs in high-churn environments.
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
✓
Transient table with Time Travel set to 1 day.
Transient tables are designed for data that is important but does not require the high level of protection provided by Fail-safe. They support Time Travel (up to 1 day) but do not have a Fail-safe period. For high-churn tables, this significantly reduces storage costs because Fail-safe records all changes for 7 days, which can be expensive with frequent updates.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Permanent table with Time Travel set to 0 days.
Why it's wrong here
While setting Time Travel to 0 days reduces that specific storage cost, Permanent tables always have a mandatory 7-day Fail-safe period. For high-churn tables, the Fail-safe layer will store every version of the changed micro-partitions for 7 days, leading to significant and unavoidable storage costs that cannot be disabled by the user.
- ✓
Transient table with Time Travel set to 1 day.
Why this is correct
Transient tables provide a balance by allowing up to 1 day of Time Travel for accidental deletion recovery while completely eliminating the 7-day Fail-safe period. This architecture is ideal for high-churn data where the cost of Fail-safe storage would outweigh the benefit of long-term emergency recovery provided by Snowflake support.
- ✗
Temporary table with Time Travel set to 90 days.
Why it's wrong here
Temporary tables only exist for the duration of the session in which they were created. Furthermore, they only support a maximum of 1 day of Time Travel (or 0 days depending on the configuration) and no Fail-safe. They are not suitable for persistent data that needs to be shared across different sessions and users.
- ✗
Permanent table with a cluster key defined on the update timestamp.
Why it's wrong here
Cluster keys help with query performance by organizing data within micro-partitions, but they do not reduce storage costs for Fail-safe or Time Travel. In fact, frequent re-clustering of a high-churn table could increase storage costs as new micro-partitions are created and old ones are moved into the Time Travel and Fail-safe layers.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Snowflake exam blueprint
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