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

Choose 2 option

Postgres Server

Aurora

Quorum

Instance

2 / 20

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

pg_tables

pg_system

pg_class

pg_catalog

3 / 20

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

Egor Rogov

Paul Sammy

Sam Altman

Dan Brown

4 / 20

4. 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

5 / 20

5. What column in system catalogs servers as the Primary Key

oid

obj

oid#

obj#

6 / 20

6. What is a schema?

Namespace that store all objects of a database

A memory area used to cache data from LRU chains

This is the same as a user in Postgres

The name used to refer to a super user account

7 / 20

7. What is the point of the pg_global tablespace?

stores WAL logs used for global replication

stores user tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

8 / 20

8. Files are logically split into pages?

False

True

9 / 20

9. TOAST tables reside in a seperate schema?

False

True

10 / 20

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

False

True

11 / 20

11. Postgres by default has built in connection pooling abilities?

True

False

12 / 20

12. System Catalog tables begin with which prefix?

pg_

cat_

sys_

dba_

13 / 20

13. What 3 files/forks as a minimum make up a table on disk?

visiblilty map

free space map

table map

Main fork

14 / 20

14. It is the postmasters job to listener for incoming connections?

True

False

15 / 20

15. Which 3 databases exist directly after cluster initialization?

choose 3 options

template1

template0

postgres

sysaux

16 / 20

16. Tablespaces are used to define physical data layout?

True

False

17 / 20

17. Postgres uses a thread based process model?

False

True

18 / 20

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

postgres

init

pginit

postman

19 / 20

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

True

False

20 / 20

20. Which fork contains the actual table data?

table map

free space map

visiblilty map

Main fork

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 parameters sets the database default isolation level?

active_transaction_isolation

default_isolation_level

transaction_isolation_level

default_transaction_isolation

2 / 10

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

Read Committed

Read Uncommitted

Serializable

Repeatable Read

3 / 10

3. The SQL standard specifies three isolation levels?

False

True

4 / 10

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

True

False

5 / 10

5. non-repeatable read anomaly occurs when?

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.

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.

6 / 10

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

False

True

7 / 10

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

False

True

8 / 10

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

choose 3

Read Uncommitted

Repeatable Read

Read Committed

Serializable

9 / 10

9. 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

10 / 10

10. What is the default Isolation Level?

Read Uncommitted

Read Committed

Repeatable Read

Serializable

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 is read only which kind of Transaction ID is it allocated?

virtual XID

temporary XID

magic XID

heap XID

2 / 10

2. indexes do not use row versioning?

True

False

3 / 10

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

False

True

4 / 10

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

dump

view

clog

heap

5 / 10

5. Which 2 items does a Virtual XID consist of?

sequential number

xmin

checksum

backend process ID

6 / 10

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

True

False

7 / 10

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

True

False

8 / 10

8. Page free space can often become fragmented?

True

False

9 / 10

9. CLOG Pages are never cached in memory?

False

True

10 / 10

10. Tuples can also be referred to as columns?

True

False

Your score is

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