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

Postgres by default has built in connection pooling abilities?

False

True

2 / 20

Which 3 databases exist directly after cluster initialization?

choose 3 options

sysaux

template1

template0

postgres

3 / 20

What is the purpose of the postgres database?

regular database that you can use at your discretion

No such database

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

a template for all the other database

4 / 20

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

False

True

5 / 20

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

6 / 20

Who is the Author of the Postgres 14 Internals book?

Sam Altman

Dan Brown

Paul Sammy

Egor Rogov

7 / 20

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

False

True

8 / 20

Which of below are predefined schemas?

choose 2

postgres

public

system

pg_catalog

9 / 20

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

False

True

10 / 20

What 3 files/forks as a minimum make up a table on disk?

free space map

Main fork

visiblilty map

table map

11 / 20

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

Access Path

Directory Path

Schema Path

Search Path

12 / 20

The default Page size is 2k?

False

True

13 / 20

What is the purpose of the visibility map?

provides the data decryption key

shows a page to be vacuumed or frozen

shows referential relationships for tables

provides an audit trail for the database

14 / 20

It is the postmasters job to listener for incoming connections?

True

False

15 / 20

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

Choose 2 option

Instance

Aurora

Postgres Server

Quorum

16 / 20

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

17 / 20

The information_schema schema provides information on Postgres release notes?

True

False

18 / 20

Postgres server spawns a new backend session for each connection?

False

True

19 / 20

A schema can belong to more than one database?

True

False

20 / 20

pg_catalog schema is used to store system catalog tables?

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

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.

Use a single SQL operator

Apply explicit locks

Issues a rollback after the commit to satisfy repeatable read.

2 / 10

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

True

False

3 / 10

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 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.

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

4 / 10

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

SAFE

ACID

HIPPA

SOC2

5 / 10

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

False

True

6 / 10

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;

7 / 10

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

True

False

8 / 10

What is the default Isolation Level?

Serializable

Repeatable Read

Read Uncommitted

Read Committed

9 / 10

Which of the below are valid Isolations Levels?

choose 2

Read Committed

Random Scatter

Rollback Read

Serializable

10 / 10

The SQL standard specifies three isolation levels?

True

False

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

Tuples can also be referred to as columns?

False

True

2 / 10

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

True

False

3 / 10

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

False

True

4 / 10

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

False

True

5 / 10

Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/subtrans

PGDATA/pg_xid

PGDATA/pg_min

6 / 10

The page header is located in the highest address?

False

True

7 / 10

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

stored in PGDATA/itemptr directory

Each pointer uses 8 bytes

Also know as the pages table of contents

Each pointer uses 4 bytes

8 / 10

To identify different versions of one and the same row, PostgreSQL marks each of them with which two value?

xmas

xid

xmin

xmax

9 / 10

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

False

True

10 / 10

Page free space can often become fragmented?

False

True

Your score is

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