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. Users should not modify the template0 database

False

True

2 / 20

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

write-ahead log (WAL)

online redo logs (ORL)

undo segments (UNDO)

rollback segments (RBS)

3 / 20

3. Some System Catalog tables are common to all databases in the cluster?

False

True

4 / 20

4. What is another name for the postgres process?

postmanager

postmaster

masterprocess

aurora

5 / 20

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

False

True

6 / 20

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

False

True

7 / 20

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

Choose 2 option

Quorum

Instance

Aurora

Postgres Server

8 / 20

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

CreateCluster

StartNewPG

CreatePGC

Initialize

9 / 20

9. Which of below are predefined schemas?

choose 2

public

system

postgres

pg_catalog

10 / 20

10. Which fork is specific for unlogged tables?

free space map

Main fork

Initialization fork

visiblilty map

11 / 20

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

Directory Path

Access Path

Schema Path

Search Path

12 / 20

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

True

False

13 / 20

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

True

False

14 / 20

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

True

False

15 / 20

15. What is the purpose of the template0 database?

Useful for Postgres support Services to debug issues

No such database

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

Useful for creating development schemas

16 / 20

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

17 / 20

17. The default Page size is 2k?

False

True

18 / 20

18. Each Database has its own System Catalog?

False

True

19 / 20

19. Which fork keeps track of available space within pages?

free space map

vacuum space map

used space map

wal space map

20 / 20

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

False

True

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

Read Uncommitted

Repeatable Read

Serializable

Read Committed

2 / 10

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

True

False

3 / 10

3. 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

reading data direct from memory using pg_dirt

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

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

4 / 10

4. The SQL standard specifies three isolation levels?

False

True

5 / 10

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

HIPPA

SOC2

SAFE

ACID

6 / 10

6. 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.

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

7 / 10

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

Select more than 1 answer below:

Apply explicit locks

Replace procedural code with declarative one.

Use a single SQL operator

Issues a rollback after the commit to satisfy repeatable read.

8 / 10

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

False

True

9 / 10

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

False

True

10 / 10

10. What is the default Isolation Level?

Read Uncommitted

Repeatable Read

Read Committed

Serializable

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

False

True

2 / 10

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

True

False

3 / 10

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

COMMIT

DELETE

INSERT

MERGE

4 / 10

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

True

False

5 / 10

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

True

False

6 / 10

6. Tuples can also be referred to as columns?

True

False

7 / 10

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

pageheadinfo

pagedetect

pageinspect

pagesize

8 / 10

8. The page Special Space is located at the start of the page with highest address

False

True

9 / 10

9. psql provides a special mode that allows you to continue a transaction after a failure?

True

False

10 / 10

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

False

True

Your score is

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