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

False

True

2 / 20

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

pginit

init

postman

postgres

3 / 20

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

False

True

4 / 20

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

True

False

5 / 20

5. What is the default standard size for a fork file?

1GB

5GB

5MB

1MB

6 / 20

6. What is the purpose of the template1 database?

regular database that you can use at your discretion

No such database

database used for temporary tables

a template for all the other databases

7 / 20

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

False

True

8 / 20

8. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

sysaux

template1

postgres

9 / 20

9. Files are logically split into pages?

False

True

10 / 20

10. 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 Postgres support Services to debug issues

Useful for creating development schemas

No such database

11 / 20

11. What is a schema?

This is the same as a user in Postgres

The name used to refer to a super user account

A memory area used to cache data from LRU chains

Namespace that store all objects of a database

12 / 20

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

13 / 20

13. What is the purpose of wal writer?

executes checkpoints

writes WAL entries to disk

collects usage statistics for the instance.

flushes dirty pages to disk.

14 / 20

14. Which of below are predefined schemas?

choose 3

information_schema

pg_toast

pg_schema

pg_temp

15 / 20

15. What is the name of the directory that contains the files related to the Postgres cluster?

PGDATA

PGTIPS

PGBASE

PGCORE

16 / 20

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

False

True

17 / 20

17. What is another name for the postgres process?

masterprocess

postmanager

aurora

postmaster

18 / 20

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

pg_catalog

pg_class

pg_system

pg_tables

19 / 20

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

Sysaux Catalog

Sys Catalog

System Catalog

Sysasm Catalog

20 / 20

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

rollback segments (RBS)

online redo logs (ORL)

undo segments (UNDO)

write-ahead log (WAL)

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 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.

Use a single SQL operator

Apply explicit locks

Replace procedural code with declarative one.

2 / 10

2. What is the default Isolation Level?

Read Uncommitted

Repeatable Read

Read Committed

Serializable

3 / 10

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

False

True

4 / 10

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

ACID

SAFE

SOC2

HIPPA

5 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

6 / 10

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

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

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

7 / 10

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

False

True

8 / 10

8. 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 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 adds some other rows satisfying this condition and commits.

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

9 / 10

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

choose 3

Serializable

Read Uncommitted

Repeatable Read

Read Committed

10 / 10

10. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Serializable

Read Committed

Random Scatter

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 of the below are true about a Pages Item Pointer?

stored in PGDATA/itemptr directory

Also know as the pages table of contents

Each pointer uses 8 bytes

Each pointer uses 4 bytes

2 / 10

2. CLOG files are stored in which directory?

PGDATA/pg_xact

PGDATA/clog

PGDATA/pg_commit

PGDATA/pg_clog

3 / 10

3. a transaction containing a savepoint is will still be considered as only a single transaction?

True

False

4 / 10

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

False

True

5 / 10

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

xmin

xid

xtime

xmax

6 / 10

6. Page free space can often become fragmented?

True

False

7 / 10

7. Information about subtransactions is stored under?

PGDATA/subtrans

PGDATA/pg_xid

PGDATA/pg_min

PGDATA/pg_subtrans

8 / 10

8. A page along with its tuples is read into the buffer cache with compression transformations to enhance cache efficiency?

True

False

9 / 10

9. In Postgres, tables are often referred to as which of the below?

dump

clog

view

heap

10 / 10

10. Tuples can also be referred to as columns?

True

False

Your score is

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