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

What is another name for the postgres process?

postmaster

postmanager

masterprocess

aurora

2 / 20

What is the point of the pg_global tablespace?

stores WAL logs used for global replication

stores user tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

3 / 20

System Catalog tables begin with which prefix?

sys_

dba_

pg_

cat_

4 / 20

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

False

True

5 / 20

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

choose 2

pg_temp

pg_default

pg_global

pg_tablespace

6 / 20

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

PGBASE

PGTIPS

PGDATA

PGCORE

7 / 20

TOAST tables reside in a seperate schema?

False

True

8 / 20

Postgres server spawns a new backend session for each connection?

False

True

9 / 20

What is the purpose of the postgres database?

No such database

a template for all the other database

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

regular database that you can use at your discretion

10 / 20

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

Choose 2 option

Quorum

Postgres Server

Instance

Aurora

11 / 20

If we create a new tablespace which directory will symbolic links be created from?

pg_symlinks

pg_tblspc

pg_tablespace

pg_tabspace

12 / 20

Which 3 databases exist directly after cluster initialization?

choose 3 options

postgres

template1

sysaux

template0

13 / 20

What is the purpose of wal writer?

executes checkpoints

writes WAL entries to disk

flushes dirty pages to disk.

collects usage statistics for the instance.

14 / 20

Which fork contains the actual table data?

visiblilty map

free space map

table map

Main fork

15 / 20

What is the process first launched at server start?

postman

pginit

init

postgres

16 / 20

Users should not modify the template0 database

False

True

17 / 20

What command is used to create the Postgres cluster?

StartNewPG

CreatePGC

CreateCluster

Initialize

18 / 20

What is the purpose of the visibility map?

shows a page to be vacuumed or frozen

provides the data decryption key

shows referential relationships for tables

provides an audit trail for the database

19 / 20

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

Schema Path

Directory Path

Access Path

Search Path

20 / 20

Who is the Author of the Postgres 14 Internals book?

Dan Brown

Sam Altman

Paul Sammy

Egor Rogov

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

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

True

False

2 / 10

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

Repeatable Read

Read Uncommitted

Serializable

Read Committed

3 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

4 / 10

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

False

True

5 / 10

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

HIPPA

SAFE

SOC2

ACID

6 / 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 also queries this same data.

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

The same transactions issues a commit, then a rollback to restore data to its original value

7 / 10

What is the default Isolation Level?

Repeatable Read

Read Committed

Serializable

Read Uncommitted

8 / 10

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 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.

9 / 10

Which of the below would best describe a dirty read?

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

reading data direct from memory using pg_dirt

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

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

10 / 10

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

choose 3

Read Uncommitted

Read Committed

Serializable

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

CLOG contains how many bits for each transaction?

2 / 10

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

False

True

3 / 10

Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/pg_xid

PGDATA/pg_min

PGDATA/subtrans

4 / 10

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

True

False

5 / 10

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

False

True

6 / 10

UPDATE can be regarded as which 2 separate operations?

MERGE

DELETE

INSERT

COMMIT

7 / 10

indexes do not use row versioning?

False

True

8 / 10

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

DELETE

CREATE

COMMIT

INSERT

9 / 10

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

False

True

10 / 10

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

xmin

xtime

xid

xmax

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.