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

1. What is the purpose of the public schema?

restricted schema for postgres internal usage only

schema used for heterogeneous replication

default schema for user objects

no such schema

2 / 20

2. What is the point of the pg_global tablespace?

stores WAL logs used for global replication

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores user tables that are common to the whole cluster

3 / 20

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

True

False

4 / 20

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

pg_system

pg_tables

pg_class

pg_catalog

5 / 20

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

True

False

6 / 20

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

Search Path

Directory Path

Schema Path

Access Path

7 / 20

7. Files are logically split into pages?

False

True

8 / 20

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

True

False

9 / 20

9. Postgres server spawns a new backend session for each connection?

False

True

10 / 20

10. Which of below are predefined schemas?

choose 2

postgres

public

pg_catalog

system

11 / 20

11. Postgres uses a thread based process model?

False

True

12 / 20

12. Users should not modify the template0 database

False

True

13 / 20

13. What is the process first launched at server start?

postman

pginit

init

postgres

14 / 20

14. Which fork keeps track of available space within pages?

free space map

wal space map

used space map

vacuum space map

15 / 20

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

pg_tabspace

pg_symlinks

pg_tblspc

pg_tablespace

16 / 20

16. Who is the Author of the Postgres 14 Internals book?

Egor Rogov

Dan Brown

Paul Sammy

Sam Altman

17 / 20

17. Each tablespaces can only be assigned for use by one database

True

False

18 / 20

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

Choose 2 option

Instance

Quorum

Aurora

Postgres Server

19 / 20

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

False

True

20 / 20

20. The default Page size is 2k?

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

1. Which of the below would best describe a dirty read?

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

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

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

reading data direct from memory using pg_dirt

2 / 10

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

SOC2

SAFE

ACID

HIPPA

3 / 10

3. The SQL standard specifies three isolation levels?

True

False

4 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

5 / 10

5. 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 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.

6 / 10

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

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

Replace procedural code with declarative one.

Use a single SQL operator

7 / 10

7. What is the default Isolation Level?

Serializable

Repeatable Read

Read Committed

Read Uncommitted

8 / 10

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

Read Uncommitted

Serializable

Repeatable Read

Read Committed

9 / 10

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

False

True

10 / 10

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

True

False

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

1. indexes do not use row versioning?

True

False

2 / 10

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

pageinspect

pagesize

pageheadinfo

pagedetect

3 / 10

3. Indexes values also support multi versioning with several versions of an index value existing at any point in time?

False

True

4 / 10

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

True

False

5 / 10

5. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/pg_min

PGDATA/pg_subtrans

PGDATA/subtrans

6 / 10

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

INSERT

CREATE

DELETE

COMMIT

7 / 10

7. Tuples can also be referred to as columns?

True

False

8 / 10

8. CLOG files are stored in which directory?

PGDATA/clog

PGDATA/pg_commit

PGDATA/pg_clog

PGDATA/pg_xact

9 / 10

9. status of a subtransaction is written into CLOG?

False

True

10 / 10

10. The page header is located in the highest address?

True

False

Your score is

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