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. The information_schema schema provides information on Postgres release notes?

False

True

2 / 20

2. What is the purpose of the postgres database?

regular database that you can use at your discretion

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

a template for all the other database

No such database

3 / 20

3. Files are logically split into pages?

True

False

4 / 20

4. What is the purpose of the template0 database?

No such database

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

Useful for creating development schemas

Useful for Postgres support Services to debug issues

5 / 20

5. What is the name of the mechanism used to store a row bigger than a page size?

TOAST

BREAD

GROW

BAKE

6 / 20

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

True

False

7 / 20

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

free space map

used space map

vacuum space map

wal space map

8 / 20

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

False

True

9 / 20

9. Which 3 databases exist directly after cluster initialization?

choose 3 options

template1

postgres

template0

sysaux

10 / 20

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

True

False

11 / 20

11. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

12 / 20

12. What is a schema?

A memory area used to cache data from LRU chains

Namespace that store all objects of a database

This is the same as a user in Postgres

The name used to refer to a super user account

13 / 20

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

14 / 20

14. What is the purpose of the template1 database?

No such database

a template for all the other databases

regular database that you can use at your discretion

database used for temporary tables

15 / 20

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

choose 3

sequences

tables

indexes

triggers

16 / 20

16. What column in system catalogs servers as the Primary Key

oid

obj#

oid#

obj

17 / 20

17. TOAST tables reside in a seperate schema?

True

False

18 / 20

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

Egor Rogov

Sam Altman

Paul Sammy

Dan Brown

19 / 20

19. What is the purpose of wal writer?

flushes dirty pages to disk.

collects usage statistics for the instance.

writes WAL entries to disk

executes checkpoints

20 / 20

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

StartNewPG

CreateCluster

CreatePGC

Initialize

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 parameters sets the database default isolation level?

default_isolation_level

default_transaction_isolation

active_transaction_isolation

transaction_isolation_level

2 / 10

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

choose 3

Read Uncommitted

Read Committed

Repeatable Read

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. 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, 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.

A transaction reads one and the same row once and modifies this row and commits the change.

5 / 10

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

SAFE

SOC2

HIPPA

ACID

6 / 10

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

True

False

7 / 10

7. The SQL standard specifies three isolation levels?

True

False

8 / 10

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

Select more than 1 answer below:

Replace procedural code with declarative one.

Apply explicit locks

Use a single SQL operator

Issues a rollback after the commit to satisfy repeatable read.

9 / 10

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

True

False

10 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_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. Tuples can also be referred to as columns?

True

False

2 / 10

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

True

False

3 / 10

3. CLOG contains how many bits for each transaction?

4 / 10

4. CLOG Pages are never cached in memory?

False

True

5 / 10

5. Which of the below are true about a Pages Item Pointer?

Also know as the pages table of contents

Each pointer uses 8 bytes

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

6 / 10

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

True

False

7 / 10

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

archive log

transaction log

commit log

redo log

8 / 10

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

pagedetect

pageinspect

pagesize

pageheadinfo

9 / 10

9. Postgres table physical data files are always cross compatible across platforms?

False

True

10 / 10

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

xid

xtime

xmin

xmax

Your score is

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