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. Each Database has its own System Catalog?

False

True

2 / 20

2. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores WAL logs used for global replication

stores user tables that are common to the whole cluster

3 / 20

3. pg_catalog schema is used to store system catalog tables?

True

False

4 / 20

4. What command is used to create the Postgres cluster?

Initialize

StartNewPG

CreatePGC

CreateCluster

5 / 20

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

True

False

6 / 20

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

choose 2

pg_tablespace

pg_default

pg_global

pg_temp

7 / 20

7. The information_schema schema provides information on Postgres release notes?

True

False

8 / 20

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

pg_tables

pg_catalog

pg_system

pg_class

9 / 20

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

True

False

10 / 20

10. Users should not modify the template0 database

False

True

11 / 20

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

obj

obj#

oid

oid#

12 / 20

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

rollback segments (RBS)

online redo logs (ORL)

undo segments (UNDO)

write-ahead log (WAL)

13 / 20

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

True

False

14 / 20

14. Tablespaces are used to define physical data layout?

False

True

15 / 20

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

init

pginit

postman

postgres

16 / 20

16. What is the purpose of the visibility map?

shows referential relationships for tables

shows a page to be vacuumed or frozen

provides the data decryption key

provides an audit trail for the database

17 / 20

17. A schema can belong to more than one database?

True

False

18 / 20

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

False

True

19 / 20

19. The default Page size is 2k?

True

False

20 / 20

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

Search Path

Access Path

Schema Path

Directory Path

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. 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 twice, another transaction modifies this row between these reads issue a rollback.

A transaction reads one and the same row once, another transaction modifies this row between these reads and commits the change.

2 / 10

2. What is the default Isolation Level?

Serializable

Read Committed

Read Uncommitted

Repeatable Read

3 / 10

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

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

a session being able to see commited 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

4 / 10

4. Snapshot isolation is preferred but increases the number of required locks?

False

True

5 / 10

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

False

True

6 / 10

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

choose 3

Read Committed

Repeatable Read

Read Uncommitted

Serializable

7 / 10

7. A phantom read anomaly occurs when?

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

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 also queries this same data.

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.

8 / 10

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

Read Committed

Read Uncommitted

Serializable

Repeatable Read

9 / 10

9. Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Rollback Read

Read Committed

Serializable

10 / 10

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

HIPPA

SAFE

ACID

SOC2

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. virtual IDs exist only in PGDATA/pg_vxid when not cached?

False

True

2 / 10

2. Tuples can also be referred to as columns?

False

True

3 / 10

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

heap

view

clog

dump

4 / 10

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

pagesize

pageheadinfo

pageinspect

pagedetect

5 / 10

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

False

True

6 / 10

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

False

True

7 / 10

7. Each page has a layer that usually consists of?

choose 2

flashback block

page header

undo segment

free space

8 / 10

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

Each pointer uses 4 bytes

Also know as the pages table of contents

Each pointer uses 8 bytes

stored in PGDATA/itemptr directory

9 / 10

9. Information about subtransactions is stored under?

PGDATA/subtrans

PGDATA/pg_min

PGDATA/pg_subtrans

PGDATA/pg_xid

10 / 10

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

False

True

Your score is

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