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

pg_catalog schema is used to store system catalog tables?

False

True

2 / 20

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

True

False

3 / 20

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

choose 3

sequences

tables

indexes

triggers

4 / 20

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

False

True

5 / 20

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

pg_tables

pg_class

pg_catalog

pg_system

6 / 20

Postgres by default has built in connection pooling abilities?

True

False

7 / 20

A single Postgres Instance can server only one database?

True

False

8 / 20

Which of below are predefined schemas?

choose 2

system

public

pg_catalog

postgres

9 / 20

Which fork is specific for unlogged tables?

Initialization fork

Main fork

free space map

visiblilty map

10 / 20

It is the postmasters job to listener for incoming connections?

False

True

11 / 20

What is the purpose of the visibility map?

provides an audit trail for the database

shows a page to be vacuumed or frozen

shows referential relationships for tables

provides the data decryption key

12 / 20

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

Search Path

Access Path

Directory Path

Schema Path

13 / 20

Which of below are predefined schemas?

choose 3

information_schema

pg_schema

pg_toast

pg_temp

14 / 20

Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

postgres

template1

sysaux

15 / 20

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

False

True

16 / 20

System Catalog tables begin with which prefix?

cat_

sys_

pg_

dba_

17 / 20

Who is the Author of the Postgres 14 Internals book?

Egor Rogov

Dan Brown

Sam Altman

Paul Sammy

18 / 20

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

False

True

19 / 20

TOAST tables reside in a seperate schema?

False

True

20 / 20

Files are logically split into pages?

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

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 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 once, another transaction modifies this row between these reads and commits the change.

2 / 10

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

Serializable

Repeatable Read

Read Committed

Read Uncommitted

3 / 10

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

False

True

4 / 10

The more locks a transaction acquires, the better it is isolated from other transactions?

True

False

5 / 10

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

True

False

6 / 10

The SQL standard specifies three isolation levels?

True

False

7 / 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.

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

Use a single SQL operator

8 / 10

Which of the below would best describe a dirty read?

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

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

9 / 10

Which parameters sets the database default isolation level?

active_transaction_isolation

default_isolation_level

default_transaction_isolation

transaction_isolation_level

10 / 10

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

HIPPA

SOC2

SAFE

ACID

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

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

Also know as the pages table of contents

Each pointer uses 4 bytes

Each pointer uses 8 bytes

stored in PGDATA/itemptr directory

2 / 10

If a transaction aborts, all page changes are reverted(rolled back) in place?

False

True

3 / 10

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

True

False

4 / 10

CLOG files are stored in which directory?

PGDATA/clog

PGDATA/pg_commit

PGDATA/pg_clog

PGDATA/pg_xact

5 / 10

Which 2 items does a Virtual XID consist of?

backend process ID

sequential number

checksum

xmin

6 / 10

index row headers like table row headers contain xmin and xmax fields?

True

False

7 / 10

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

True

False

8 / 10

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

True

False

9 / 10

Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/subtrans

PGDATA/pg_xid

PGDATA/pg_min

10 / 10

What does an Item Pointer contain?

choose 3

tuple xid

tuple length

tuple offset from the start of the page

tuple status

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.