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 name of the mechanism used to store a row bigger than a page size?

BREAD

GROW

TOAST

BAKE

2 / 20

2. Postgres uses a thread based process model?

True

False

3 / 20

3. The default Page size is 2k?

False

True

4 / 20

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

Choose 2 option

Instance

Aurora

Quorum

Postgres Server

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. Tablespaces are used to define physical data layout?

True

False

7 / 20

7. What is the name of the catalog that stores metadata for all cluster objects?

System Catalog

Sysaux Catalog

Sysasm Catalog

Sys Catalog

8 / 20

8. System Catalog tables begin with which prefix?

sys_

pg_

cat_

dba_

9 / 20

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

False

True

10 / 20

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

choose 2

pg_global

pg_default

pg_tablespace

pg_temp

11 / 20

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

free space map

used space map

wal space map

vacuum space map

12 / 20

12. 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

13 / 20

13. What is the purpose of the template0 database?

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

Useful for creating development schemas

No such database

Useful for Postgres support Services to debug issues

14 / 20

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

False

True

15 / 20

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

False

True

16 / 20

16. What is the purpose of wal writer?

writes WAL entries to disk

flushes dirty pages to disk.

executes checkpoints

collects usage statistics for the instance.

17 / 20

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

False

True

18 / 20

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

True

False

19 / 20

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

True

False

20 / 20

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

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

HIPPA

ACID

SAFE

SOC2

2 / 10

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

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

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

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

reading data direct from memory using pg_dirt

3 / 10

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

Repeatable Read

Serializable

Read Committed

Read Uncommitted

4 / 10

4. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Random Scatter

Serializable

5 / 10

5. Which parameters sets the database default isolation level?

transaction_isolation_level

default_isolation_level

default_transaction_isolation

active_transaction_isolation

6 / 10

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

Select more than 1 answer below:

Use a single SQL operator

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

Replace procedural code with declarative one.

7 / 10

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

True

False

8 / 10

8. non-repeatable read anomaly occurs when?

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.

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

9 / 10

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

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

10 / 10

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

False

True

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. indexes do not use row versioning?

False

True

2 / 10

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

transaction log

archive log

redo log

commit log

3 / 10

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

False

True

4 / 10

4. Tuples can also be referred to as columns?

True

False

5 / 10

5. CLOG Pages are never cached in memory?

False

True

6 / 10

6. Which 2 items does a Virtual XID consist of?

sequential number

checksum

backend process ID

xmin

7 / 10

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

pg_current_xact_id()

pg_current_id()

pg_current_commit_id()

pg_current_xmin_id()

8 / 10

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

COMMIT

CREATE

INSERT

DELETE

9 / 10

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

MERGE

COMMIT

INSERT

DELETE

10 / 10

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

True

False

Your score is

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