Postgres Quiz Archive

You have 200 seconds to answer 20 Random questions so think fast!

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Created by Paul Sammy

PostgreSQL 14 Internals Chapter 1

A quiz to test the knowledge of those reading and learning from Postgres 14 Internals book by Egor Rogov, covering topics in Chapter 1.

1 / 20

1. A schema can belong to more than one database?

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2. To understand each other, a client and a server must use one and the same interfacing protocol?

3 / 20

3. Files are logically split into pages?

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4. What is the default standard size for a fork file?

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5. Users should not modify the template0 database

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6. To be able to restore data consistency, Postgres maintains

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7. Which 3 databases exist directly after cluster initialization?

choose 3 options

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8. Tablespaces can be used to segregate data based on performance needs?

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9. What column in system catalogs servers as the Primary Key

10 / 20

10. What command is used to create the Postgres cluster?

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11. Which fork contains the actual table data?

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12. Each Database has its own System Catalog?

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13. What is the name of the system catalog table for relations?

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14. pg_catalog schema is used to store system catalog tables?

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15. What is a schema?

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16. System Catalog tables begin with which prefix?

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17. The pg_default tablespace should never be used to create user tables?

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18. What is the purpose of autovacuum?

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19. Which of below are predefined schemas?

choose 2

20 / 20

20. How many files or forks on disk will a 10Mb table with no index have?

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Created by Paul Sammy

PostgreSQL 14 Internals Chapter 2

A quiz to test the knowledge of those reading and learning from Postgres 14 Internals book by Egor Rogov, covering topics in Chapter 2.

1 / 10

1. Which of the below would best describe a dirty read?

2 / 10

2. At any moment the database system can contain several versions of one and the same row?

3 / 10

3. Snapshot isolation is preferred but increases the number of required locks?

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4. The SQL standard specifies three isolation levels?

5 / 10

5. Based on Snapshot Isolation use of MVCC which of the below are permitted?

choose 3

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6. What are some of database features we can use to avoid a non repeatable read?

Select more than 1 answer below:

7 / 10

7. Lost updates are forbidden by the standard at all isolation levels?

8 / 10

8. Data Consistency is best handled at the application layer rather than at the database layer?

9 / 10

9. Which isolation level in theory could mean an application does not have to consider isolation anomalies?

10 / 10

10. What is the default Isolation Level?

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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.

1 / 10

1. To identify different versions of one and the same row, PostgreSQL marks each of them with which two value?

2 / 10

2. status of a subtransaction is written into CLOG?

3 / 10

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

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4. Which function can we use to find the current transaction ID?

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

6 / 10

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

7 / 10

7. CLOG contains how many bits for each transaction?

8 / 10

8. The page header is located in the highest address?

9 / 10

9. UPDATE can be regarded as which 2 separate operations?

10 / 10

10. Information about subtransactions is stored under?

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