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

True

False

2 / 20

2. How many files or forks on disk will a 10Mb table with no index have?

3 / 20

3. What is another name for the postgres process?

masterprocess

aurora

postmanager

postmaster

4 / 20

4. Which 3 databases exist directly after cluster initialization?

choose 3 options

sysaux

postgres

template1

template0

5 / 20

5. What is the purpose of the template0 database?

Useful for creating development schemas

No such database

Useful for Postgres support Services to debug issues

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

6 / 20

6. What is the purpose of the visibility map?

shows referential relationships for tables

provides an audit trail for the database

provides the data decryption key

shows a page to be vacuumed or frozen

7 / 20

7. To be able to restore data consistency, Postgres maintains

rollback segments (RBS)

undo segments (UNDO)

online redo logs (ORL)

write-ahead log (WAL)

8 / 20

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

Paul Sammy

Sam Altman

Dan Brown

Egor Rogov

9 / 20

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

vacuum space map

wal space map

free space map

used space map

10 / 20

10. Files are logically split into pages?

True

False

11 / 20

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

Choose 2 option

Quorum

Aurora

Postgres Server

Instance

12 / 20

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

choose 2

pg_temp

pg_tablespace

pg_global

pg_default

13 / 20

13. Tablespaces are used to define physical data layout?

False

True

14 / 20

14. What is the purpose of the postgres database?

a template for all the other database

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

regular database that you can use at your discretion

No such database

15 / 20

15. What is the purpose of the public schema?

no such schema

schema used for heterogeneous replication

default schema for user objects

restricted schema for postgres internal usage only

16 / 20

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

pg_tablespace

pg_tabspace

pg_symlinks

pg_tblspc

17 / 20

17. How many rows in a page does Postgres aim to have before considering TOAST?

18 / 20

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

True

False

19 / 20

19. Postgres uses a thread based process model?

False

True

20 / 20

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

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. The more locks a transaction acquires, the better it is isolated from other transactions?

True

False

2 / 10

2. The SQL standard specifies three isolation levels?

False

True

3 / 10

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

True

False

4 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

5 / 10

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

Read Uncommitted

Read Committed

Repeatable Read

Serializable

6 / 10

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

SAFE

SOC2

HIPPA

ACID

7 / 10

7. 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 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.

8 / 10

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

Select more than 1 answer below:

Use a single SQL operator

Apply explicit locks

Replace procedural code with declarative one.

Issues a rollback after the commit to satisfy repeatable read.

9 / 10

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

choose 3

Serializable

Read Uncommitted

Read Committed

Repeatable Read

10 / 10

10. Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Rollback Read

Serializable

Read Committed

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

True

False

2 / 10

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

False

True

3 / 10

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

COMMIT

DELETE

INSERT

CREATE

4 / 10

4. a transaction containing a savepoint is will still be considered as only a single transaction?

True

False

5 / 10

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

True

False

6 / 10

6. indexes do not use row versioning?

False

True

7 / 10

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

False

True

8 / 10

8. index row headers like table row headers contain xmin and xmax fields?

True

False

9 / 10

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

stored in PGDATA/itemptr directory

Each pointer uses 8 bytes

Also know as the pages table of contents

Each pointer uses 4 bytes

10 / 10

10. Page free space can often become fragmented?

False

True

Your score is

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