Postgres Quiz Archive

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

You will need to score 80% or over to pass!

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. Tablespaces are used to define physical data layout?

False

True

2 / 20

2. How does Postgres know which schema to use if not specified?

Directory Path

Schema Path

Search Path

Access Path

3 / 20

3. Who is the Author of the Postgres 14 Internals book?

Dan Brown

Sam Altman

Egor Rogov

Paul Sammy

4 / 20

4. Which of the below objects can be referred to as relations?

choose 3

tables

triggers

indexes

sequences

5 / 20

5. Postgres uses a thread based process model?

True

False

6 / 20

6. How many rows in a page does Postgres aim to have before considering TOAST?

7 / 20

7. Which of below are predefined schemas?

choose 3

pg_schema

information_schema

pg_toast

pg_temp

8 / 20

8. A single Postgres Instance can server only one database?

False

True

9 / 20

9. What is the process first launched at server start?

init

postman

pginit

postgres

10 / 20

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

True

False

11 / 20

11. What is the purpose of the visibility map?

shows referential relationships for tables

provides the data decryption key

provides an audit trail for the database

shows a page to be vacuumed or frozen

12 / 20

12. What is the purpose of wal writer?

collects usage statistics for the instance.

flushes dirty pages to disk.

executes checkpoints

writes WAL entries to disk

13 / 20

13. What 3 files/forks as a minimum make up a table on disk?

visiblilty map

Main fork

table map

free space map

14 / 20

14. It is the postmasters job to listener for incoming connections?

False

True

15 / 20

15. What is the purpose of the template1 database?

database used for temporary tables

regular database that you can use at your discretion

a template for all the other databases

No such database

16 / 20

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

pg_catalog

pg_system

pg_tables

pg_class

17 / 20

17. A Postgres cluster consists of 2 or more physical servers accessing one Postgres Instance?

False

True

18 / 20

18. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

stores WAL logs used for global replication

19 / 20

19. The information_schema schema provides information on Postgres release notes?

True

False

20 / 20

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

Your score is

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. What is the default Isolation Level?

Serializable

Read Uncommitted

Repeatable Read

Read Committed

2 / 10

2. The more locks a transaction acquires, the better it is isolated from other transactions?

True

False

3 / 10

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

False

True

4 / 10

4. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Read Committed

Random Scatter

Serializable

5 / 10

5. What is the acronym used for the attributes that ensure Data consistency, integrity and durability?

SAFE

HIPPA

SOC2

ACID

6 / 10

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

True

False

7 / 10

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

True

False

8 / 10

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

reading the data directly from file using a text editor such as vi or notepad

a session being able to see uncommited data altered by another session

reading data direct from memory using pg_dirt

a session being able to see commited data altered by another session

9 / 10

9. non-repeatable read anomaly occurs when?

A transaction reads one and the same row twice, another transaction modifies this row between these reads and commits the change.

A transaction reads one and the same row once and modifies this row and commits the change.

A transaction reads one and the same row twice, another transaction modifies this row between these reads issue a rollback.

A transaction reads one and the same row once, another transaction modifies this row between these reads and commits the change.

10 / 10

10. A phantom read anomaly occurs when?

The same transactions issues a commit, then a rollback to restore data to its original value

A transactions inserts a null value into a not null columns and commits

The same transaction executes two identical queries returning a set of rows that satisfy a particular condition, while another transaction adds some other rows satisfying this condition and commits.

The same transaction executes two identical queries returning a set of rows that satisfy a particular condition, while another transaction also queries this same data.

Your score is

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. Page header sizes can be easily displayed using the <choose from answers> extension

pagedetect

pagesize

pageinspect

pageheadinfo

2 / 10

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

COMMIT

MERGE

INSERT

DELETE

3 / 10

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

False

True

4 / 10

4. index row headers like table row headers contain xmin and xmax fields?

False

True

5 / 10

5. Indexes values also support multi versioning with several versions of an index value existing at any point in time?

True

False

6 / 10

6. status of a subtransaction is written into CLOG?

False

True

7 / 10

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

Also know as the pages table of contents

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

Each pointer uses 8 bytes

8 / 10

8. Postgres table physical data files are always cross compatible across platforms?

True

False

9 / 10

9. Rows of TOAST tables are handled in such a way that they are never update?

True

False

10 / 10

10. If a transaction aborts, all page changes are reverted(rolled back) in place?

True

False

Your score is

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