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 uses a thread based process model?

True

False

2 / 20

What is the purpose of the public schema?

restricted schema for postgres internal usage only

schema used for heterogeneous replication

no such schema

default schema for user objects

3 / 20

Which of below are predefined schemas?

choose 3

information_schema

pg_toast

pg_schema

pg_temp

4 / 20

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

False

True

5 / 20

Postgres by default has built in connection pooling abilities?

False

True

6 / 20

Which of below are predefined schemas?

choose 2

pg_catalog

postgres

public

system

7 / 20

Who is the Author of the Postgres 14 Internals book?

Sam Altman

Egor Rogov

Paul Sammy

Dan Brown

8 / 20

The information_schema schema provides information on Postgres release notes?

False

True

9 / 20

Files are logically split into pages?

False

True

10 / 20

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

True

False

11 / 20

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

False

True

12 / 20

What is the purpose of autovacuum?

Rebuilds indexes with b level greater than 2

Deletes old logs and traces on disk

Removes stale data from tables and indexes

Performs a backup of WAL logs

13 / 20

What is the purpose of the template1 database?

regular database that you can use at your discretion

No such database

a template for all the other databases

database used for temporary tables

14 / 20

What is another name for the postgres process?

masterprocess

aurora

postmaster

postmanager

15 / 20

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

Choose 2 option

Aurora

Postgres Server

Quorum

Instance

16 / 20

System Catalog tables begin with which prefix?

sys_

cat_

dba_

pg_

17 / 20

Each tablespaces can only be assigned for use by one database

False

True

18 / 20

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

choose 2

pg_global

pg_tablespace

pg_default

pg_temp

19 / 20

What is the point of the pg_global tablespace?

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

stores WAL logs used for global replication

stores temporary tables that are common to the whole cluster

20 / 20

Which fork is specific for unlogged tables?

visiblilty map

Main fork

Initialization fork

free space map

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

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;

2 / 10

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

False

True

3 / 10

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

ACID

SOC2

HIPPA

SAFE

4 / 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

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

5 / 10

What is the default Isolation Level?

Read Committed

Read Uncommitted

Serializable

Repeatable Read

6 / 10

Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Serializable

Random Scatter

7 / 10

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

True

False

8 / 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 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.

A transaction reads one and the same row twice, another transaction modifies this row between these reads issue a rollback.

9 / 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.

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.

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

10 / 10

The SQL standard specifies three isolation levels?

False

True

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

If a transaction is read only which kind of Transaction ID is it allocated?

magic XID

virtual XID

heap XID

temporary XID

2 / 10

CLOG Pages are never cached in memory?

False

True

3 / 10

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

False

True

4 / 10

CLOG contains how many bits for each transaction?

5 / 10

CLOG files are stored in which directory?

PGDATA/clog

PGDATA/pg_commit

PGDATA/pg_xact

PGDATA/pg_clog

6 / 10

status of a subtransaction is written into CLOG?

True

False

7 / 10

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

heap

clog

dump

view

8 / 10

indexes do not use row versioning?

False

True

9 / 10

The page header is located in the highest address?

False

True

10 / 10

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

False

True

Your score is

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