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

System Catalog tables begin with which prefix?

dba_

cat_

sys_

pg_

2 / 20

Which fork is specific for unlogged tables?

Main fork

visiblilty map

free space map

Initialization fork

3 / 20

The information_schema schema provides information on Postgres release notes?

True

False

4 / 20

A single Postgres Instance can server only one database?

True

False

5 / 20

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

choose 2

pg_default

pg_global

pg_temp

pg_tablespace

6 / 20

What is another name for the postgres process?

aurora

postmaster

postmanager

masterprocess

7 / 20

Which 3 databases exist directly after cluster initialization?

choose 3 options

sysaux

postgres

template0

template1

8 / 20

Postgres server spawns a new backend session for each connection?

True

False

9 / 20

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

pg_symlinks

pg_tabspace

pg_tablespace

pg_tblspc

10 / 20

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

choose 3

triggers

tables

indexes

sequences

11 / 20

TOAST tables reside in a seperate schema?

False

True

12 / 20

It is the postmasters job to listener for incoming connections?

True

False

13 / 20

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

pg_catalog

pg_system

pg_tables

pg_class

14 / 20

Users should not modify the template0 database

True

False

15 / 20

Postgres by default has built in connection pooling abilities?

True

False

16 / 20

Each Database has its own System Catalog?

False

True

17 / 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

18 / 20

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

Choose 2 option

Aurora

Quorum

Instance

Postgres Server

19 / 20

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

Search Path

Access Path

Schema Path

Directory Path

20 / 20

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

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

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

True

False

2 / 10

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

ACID

SOC2

SAFE

HIPPA

3 / 10

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

4 / 10

Which parameters sets the database default isolation level?

transaction_isolation_level

default_transaction_isolation

default_isolation_level

active_transaction_isolation

5 / 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 transactions issues a commit, then a rollback to restore data to its original value

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

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.

6 / 10

What is the default Isolation Level?

Read Committed

Repeatable Read

Serializable

Read Uncommitted

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.

Use a single SQL operator

Apply explicit locks

8 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

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 commited data altered by another session

reading data direct from memory using pg_dirt

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

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

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

In Postgres, tables are often referred to as which of the below?

view

dump

heap

clog

2 / 10

CLOG contains how many bits for each transaction?

3 / 10

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

Each pointer uses 8 bytes

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

Also know as the pages table of contents

4 / 10

status of a subtransaction is written into CLOG?

True

False

5 / 10

A page along with its tuples is read into the buffer cache with compression transformations to enhance cache efficiency?

False

True

6 / 10

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

xmin

xid

xmax

xmas

7 / 10

CLOG files are stored in which directory?

PGDATA/pg_clog

PGDATA/clog

PGDATA/pg_commit

PGDATA/pg_xact

8 / 10

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

False

True

9 / 10

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

transaction log

redo log

commit log

archive log

10 / 10

at any one time Postgres can have several versions of a row?

False

True

Your score is

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