PostgreSQL 14 Internals Quiz

Created by Paul Sammy

PostgreSQL 14 Internals Chapter 3

A quiz to test the knowledge of those reading and learning from Postgres 14 Internals book by Egor Rogov, covering topics in Chapter 3.

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1. virtual IDs exist only in PGDATA/pg_vxid when not cached?

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2. Which 2 of the below represent transaction IDs used for row versioning?

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3. Which 2 items does a Virtual XID consist of?

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4. What does an Item Pointer contain?

choose 3

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5. Which of the below are true about a Pages Item Pointer?

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6. Information about subtransactions is stored under?

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7. CLOG contains how many bits for each transaction?

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8. When a transaction is committed Postgres uses a special <replace with answer> structure?

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9. CLOG Pages are never cached in memory?

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10. If a transaction is read only which kind of Transaction ID is it allocated?

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