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

TOAST tables reside in a seperate schema?

True

False

2 / 20

Each tablespaces can only be assigned for use by one database

False

True

3 / 20

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

choose 3

indexes

triggers

sequences

tables

4 / 20

What is the purpose of the visibility map?

shows a page to be vacuumed or frozen

provides an audit trail for the database

shows referential relationships for tables

provides the data decryption key

5 / 20

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

False

True

6 / 20

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

pg_symlinks

pg_tblspc

pg_tabspace

pg_tablespace

7 / 20

Which fork keeps track of available space within pages?

free space map

vacuum space map

used space map

wal space map

8 / 20

Users should not modify the template0 database

True

False

9 / 20

To understand each other, a client and a server must use one and the same interfacing protocol?

False

True

10 / 20

Tablespaces are used to define physical data layout?

False

True

11 / 20

What is the purpose of the public schema?

schema used for heterogeneous replication

restricted schema for postgres internal usage only

no such schema

default schema for user objects

12 / 20

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

Choose 2 option

Quorum

Aurora

Instance

Postgres Server

13 / 20

What is the process first launched at server start?

pginit

init

postgres

postman

14 / 20

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

PGTIPS

PGBASE

PGDATA

PGCORE

15 / 20

Postgres server spawns a new backend session for each connection?

True

False

16 / 20

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

True

False

17 / 20

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

choose 2

pg_tablespace

pg_default

pg_temp

pg_global

18 / 20

Files are logically split into pages?

True

False

19 / 20

A single Postgres Instance can server only one database?

True

False

20 / 20

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

pg_catalog

pg_class

pg_system

pg_tables

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 is the default Isolation Level?

Repeatable Read

Serializable

Read Committed

Read Uncommitted

2 / 10

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

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

3 / 10

A phantom read anomaly occurs when?

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.

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

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 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 twice, another transaction modifies this row between these reads issue a rollback.

5 / 10

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

True

False

6 / 10

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

SAFE

HIPPA

SOC2

ACID

7 / 10

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

choose 3

Read Committed

Serializable

Read Uncommitted

Repeatable Read

8 / 10

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

True

False

9 / 10

The SQL standard specifies three isolation levels?

False

True

10 / 10

Which of the below would best describe a dirty read?

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

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

reading data direct from memory using pg_dirt

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 2 items does a Virtual XID consist of?

xmin

checksum

backend process ID

sequential number

2 / 10

indexes do not use row versioning?

False

True

3 / 10

UPDATE can be regarded as which 2 separate operations?

MERGE

COMMIT

DELETE

INSERT

4 / 10

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

pagesize

pageinspect

pagedetect

pageheadinfo

5 / 10

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

Each pointer uses 4 bytes

Also know as the pages table of contents

stored in PGDATA/itemptr directory

Each pointer uses 8 bytes

6 / 10

Which function can we use to find the current transaction ID?

pg_current_xmin_id()

pg_current_commit_id()

pg_current_id()

pg_current_xact_id()

7 / 10

What does an Item Pointer contain?

choose 3

tuple offset from the start of the page

tuple status

tuple length

tuple xid

8 / 10

status of a subtransaction is written into CLOG?

False

True

9 / 10

CLOG files are stored in which directory?

PGDATA/pg_xact

PGDATA/pg_commit

PGDATA/clog

PGDATA/pg_clog

10 / 10

The page header stores checksum and the sizes of the other parts of the page?

True

False

Your score is

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