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 a schema?

The name used to refer to a super user account

This is the same as a user in Postgres

A memory area used to cache data from LRU chains

Namespace that store all objects of a database

2 / 20

2. What is another name for the postgres process?

postmaster

postmanager

aurora

masterprocess

3 / 20

3. Which 3 databases exist directly after cluster initialization?

choose 3 options

postgres

sysaux

template0

template1

4 / 20

4. Postgres by default has built in connection pooling abilities?

False

True

5 / 20

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

False

True

6 / 20

6. If we create a new tablespace which directory will symbolic links be created from?

pg_tblspc

pg_symlinks

pg_tablespace

pg_tabspace

7 / 20

7. Each Database has its own System Catalog?

False

True

8 / 20

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

False

True

9 / 20

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

True

False

10 / 20

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

rollback segments (RBS)

write-ahead log (WAL)

online redo logs (ORL)

undo segments (UNDO)

11 / 20

11. What is the name of the 2 default tablespaces created after initialization?

choose 2

pg_tablespace

pg_global

pg_temp

pg_default

12 / 20

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

True

False

13 / 20

13. Which fork is specific for unlogged tables?

free space map

Initialization fork

Main fork

visiblilty map

14 / 20

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

Dan Brown

Egor Rogov

Sam Altman

Paul Sammy

15 / 20

15. What is the point of the pg_global tablespace?

stores WAL logs used for global replication

stores user tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

16 / 20

16. What is the purpose of the public schema?

no such schema

restricted schema for postgres internal usage only

schema used for heterogeneous replication

default schema for user objects

17 / 20

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

choose 3

sequences

indexes

triggers

tables

18 / 20

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

19 / 20

19. Postgres uses a thread based process model?

True

False

20 / 20

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

True

False

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

False

True

2 / 10

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

choose 3

Serializable

Repeatable Read

Read Committed

Read Uncommitted

3 / 10

3. A phantom read anomaly occurs when?

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

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.

4 / 10

4. which of the below statements will start a transaction as Read Repeatable?

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

5 / 10

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

HIPPA

SAFE

ACID

SOC2

6 / 10

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

True

False

7 / 10

7. What is the default Isolation Level?

Read Committed

Read Uncommitted

Serializable

Repeatable Read

8 / 10

8. non-repeatable read anomaly occurs when?

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.

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 and commits the change.

9 / 10

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

False

True

10 / 10

10. Which parameters sets the database default isolation level?

active_transaction_isolation

transaction_isolation_level

default_isolation_level

default_transaction_isolation

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 function can we use to find the current transaction ID?

pg_current_id()

pg_current_xact_id()

pg_current_xmin_id()

pg_current_commit_id()

2 / 10

2. CLOG Pages are never cached in memory?

True

False

3 / 10

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

DELETE

COMMIT

INSERT

CREATE

4 / 10

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

True

False

5 / 10

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

xmax

xid

xmin

xtime

6 / 10

6. Tuples can also be referred to as columns?

False

True

7 / 10

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

False

True

8 / 10

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

False

True

9 / 10

9. status of a subtransaction is written into CLOG?

False

True

10 / 10

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

transaction log

redo log

commit log

archive log

Your score is

Cookie	Duration	Description
cookielawinfo-checkbox-analytics	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional	11 months	The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy	11 months	The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.