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. What is the purpose of the template0 database?

No such database

Useful for Postgres support Services to debug issues

Useful for restoring data from a logical backup or creating a database with a different encoding

Useful for creating development schemas

2 / 20

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

3 / 20

3. What is the purpose of the public schema?

restricted schema for postgres internal usage only

schema used for heterogeneous replication

no such schema

default schema for user objects

4 / 20

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

True

False

5 / 20

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

pg_catalog

pg_tables

pg_system

pg_class

6 / 20

6. Postgres server spawns a new backend session for each connection?

False

True

7 / 20

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

postman

postgres

init

pginit

8 / 20

8. Which of below are predefined schemas?

choose 2

pg_catalog

system

public

postgres

9 / 20

9. Files are logically split into pages?

False

True

10 / 20

10. What is the purpose of the template1 database?

database used for temporary tables

a template for all the other databases

No such database

regular database that you can use at your discretion

11 / 20

11. When PostgreSQL is running what can it be referred to as?

Choose 2 option

Instance

Aurora

Postgres Server

Quorum

12 / 20

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

True

False

13 / 20

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

online redo logs (ORL)

undo segments (UNDO)

rollback segments (RBS)

write-ahead log (WAL)

14 / 20

14. Postgres uses a thread based process model?

False

True

15 / 20

15. Which fork contains the actual table data?

visiblilty map

free space map

Main fork

table map

16 / 20

16. What is another name for the postgres process?

aurora

postmanager

masterprocess

postmaster

17 / 20

17. Each tablespaces can only be assigned for use by one database

False

True

18 / 20

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

19 / 20

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

free space map

visiblilty map

table map

Main fork

20 / 20

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

Paul Sammy

Dan Brown

Sam Altman

Egor Rogov

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

True

False

2 / 10

2. What is the default Isolation Level?

Read Committed

Serializable

Read Uncommitted

Repeatable Read

3 / 10

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

Read Uncommitted

Serializable

Read Committed

Repeatable Read

4 / 10

4. A phantom read anomaly occurs when?

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.

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.

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

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

5 / 10

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

ACID

HIPPA

SAFE

SOC2

6 / 10

6. 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.

7 / 10

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

True

False

8 / 10

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

False

True

9 / 10

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

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

Apply explicit locks

Use a single SQL operator

10 / 10

10. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Serializable

Random Scatter

Rollback Read

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. Which 2 items does a Virtual XID consist of?

checksum

sequential number

backend process ID

xmin

2 / 10

2. Tuples can also be referred to as columns?

False

True

3 / 10

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

xid

xmas

xmin

xmax

4 / 10

4. at any one time Postgres can have several versions of a row?

True

False

5 / 10

5. What does an Item Pointer contain?

choose 3

tuple status

tuple length

tuple xid

tuple offset from the start of the page

6 / 10

6. When a row is created, its xmin value is set to the transaction ID of which command?

COMMIT

CREATE

DELETE

INSERT

7 / 10

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

False

True

8 / 10

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

True

False

9 / 10

9. CLOG contains how many bits for each transaction?

10 / 10

10. indexes do not use row versioning?

False

True

Your score is

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