Write Ahead Logging (WAL) & Checkpointing Quiz

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📋 Postgres Database Administration – Write Ahead Logging (WAL) & Checkpointing

20 questions · 15 min timer · Explanations included · Free

Which of the following actions can help reduce WAL generation in a high-write environment?

Set wal_level to 'logical'

Increase checkpoint_timeout

Use unlogged tables for non-critical data

Enable full_page_writes

None

Unlogged tables do not generate WAL, which can significantly reduce WAL generation for non-critical data that does not require durability.

What is a potential risk of setting wal_keep_segments too low in a streaming replication setup?

Increased disk usage on the primary server

Increased frequency of checkpoints

Replication lag due to insufficient WAL segments

Higher CPU usage on the replica

None

If wal_keep_segments is set too low, the replica might not be able to catch up if it falls behind, leading to replication lag or even failure.

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