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?

False

True

2 / 20

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

choose 3

triggers

tables

sequences

indexes

3 / 20

A single Postgres Instance can server only one database?

True

False

4 / 20

What is another name for the postgres process?

postmanager

postmaster

aurora

masterprocess

5 / 20

What is the purpose of the template1 database?

regular database that you can use at your discretion

database used for temporary tables

No such database

a template for all the other databases

6 / 20

Which of below are predefined schemas?

choose 2

pg_catalog

system

public

postgres

7 / 20

What is the purpose of the template0 database?

Useful for Postgres support Services to debug issues

No such database

Useful for creating development schemas

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

8 / 20

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

Choose 2 option

Quorum

Instance

Aurora

Postgres Server

9 / 20

Which of below are predefined schemas?

choose 3

information_schema

pg_toast

pg_temp

pg_schema

10 / 20

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

Access Path

Schema Path

Search Path

Directory Path

11 / 20

What is the purpose of the visibility map?

shows referential relationships for tables

shows a page to be vacuumed or frozen

provides an audit trail for the database

provides the data decryption key

12 / 20

The information_schema schema provides information on Postgres release notes?

True

False

13 / 20

What is the purpose of the public schema?

restricted schema for postgres internal usage only

no such schema

schema used for heterogeneous replication

default schema for user objects

14 / 20

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

pg_tablespace

pg_tblspc

pg_symlinks

pg_tabspace

15 / 20

Who is the Author of the Postgres 14 Internals book?

Paul Sammy

Sam Altman

Egor Rogov

Dan Brown

16 / 20

Tablespaces are used to define physical data layout?

False

True

17 / 20

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

False

True

18 / 20

What is the name of the catalog that stores metadata for all cluster objects?

System Catalog

Sysaux Catalog

Sys Catalog

Sysasm Catalog

19 / 20

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

False

True

20 / 20

Each Database has its own System Catalog?

True

False

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

The SQL standard specifies three isolation levels?

True

False

3 / 10

What are some of database features we can use to avoid a non repeatable read?

Select more than 1 answer below:

Apply explicit locks

Issues a rollback after the commit to satisfy repeatable read.

Use a single SQL operator

Replace procedural code with declarative one.

4 / 10

Which of the below would best describe a dirty read?

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

a session being able to see uncommited 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

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 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

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

6 / 10

Which parameters sets the database default isolation level?

default_transaction_isolation

active_transaction_isolation

transaction_isolation_level

default_isolation_level

7 / 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, 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 issue a rollback.

8 / 10

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

True

False

9 / 10

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

False

True

10 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=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

The page header is located in the highest address?

True

False

2 / 10

Tuples can also be referred to as columns?

False

True

3 / 10

The page Special Space is located at the start of the page with highest address

False

True

4 / 10

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

True

False

5 / 10

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

False

True

6 / 10

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

True

False

7 / 10

indexes do not use row versioning?

True

False

8 / 10

status of a subtransaction is written into CLOG?

False

True

9 / 10

UPDATE can be regarded as which 2 separate operations?

INSERT

COMMIT

MERGE

DELETE

10 / 10

CLOG Pages are never cached in memory?

True

False

Your score is

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