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. Users should not modify the template0 database

False

True

2 / 20

2. A single Postgres Instance can server only one database?

False

True

3 / 20

3. 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

4 / 20

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

Search Path

Directory Path

Access Path

Schema Path

5 / 20

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

Choose 2 option

Quorum

Instance

Postgres Server

Aurora

6 / 20

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

False

True

7 / 20

7. What is a schema?

This is the same as a user in Postgres

Namespace that store all objects of a database

The name used to refer to a super user account

A memory area used to cache data from LRU chains

8 / 20

8. What is the purpose of the template1 database?

a template for all the other databases

database used for temporary tables

regular database that you can use at your discretion

No such database

9 / 20

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

False

True

10 / 20

10. What is the point of the pg_global tablespace?

stores system catalog objects that are common to the whole cluster

stores WAL logs used for global replication

stores temporary tables that are common to the whole cluster

stores user tables that are common to the whole cluster

11 / 20

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

pg_catalog

pg_class

pg_tables

pg_system

12 / 20

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

13 / 20

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

False

True

14 / 20

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

True

False

15 / 20

15. What is another name for the postgres process?

postmaster

postmanager

aurora

masterprocess

16 / 20

16. What is the purpose of the public schema?

default schema for user objects

restricted schema for postgres internal usage only

no such schema

schema used for heterogeneous replication

17 / 20

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

True

False

18 / 20

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

choose 2

pg_temp

pg_tablespace

pg_default

pg_global

19 / 20

19. What is the purpose of autovacuum?

Rebuilds indexes with b level greater than 2

Performs a backup of WAL logs

Deletes old logs and traces on disk

Removes stale data from tables and indexes

20 / 20

20. Postgres uses a thread based process model?

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

False

True

2 / 10

2. non-repeatable read anomaly occurs when?

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.

A transaction reads one and the same row once and modifies this row and commits the change.

3 / 10

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

True

False

4 / 10

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

choose 3

Serializable

Repeatable Read

Read Uncommitted

Read Committed

5 / 10

5. 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 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.

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

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

True

False

7 / 10

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

Read Committed

Serializable

Read Uncommitted

Repeatable Read

8 / 10

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

False

True

9 / 10

9. What is the default Isolation Level?

Serializable

Read Uncommitted

Repeatable Read

Read Committed

10 / 10

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

ACID

SAFE

HIPPA

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. Information about subtransactions is stored under?

PGDATA/pg_min

PGDATA/subtrans

PGDATA/pg_subtrans

PGDATA/pg_xid

2 / 10

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

pageinspect

pagesize

pageheadinfo

pagedetect

3 / 10

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

True

False

4 / 10

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

False

True

5 / 10

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

False

True

6 / 10

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

Each pointer uses 8 bytes

Also know as the pages table of contents

Each pointer uses 4 bytes

stored in PGDATA/itemptr directory

7 / 10

7. Tuples can also be referred to as columns?

False

True

8 / 10

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

choose 2

undo segment

free space

page header

flashback block

9 / 10

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

checksum

sequential number

xmin

backend process ID

10 / 10

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

True

False

Your score is

Cookie	Duration	Description
cookielawinfo-checkbox-analytics	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional	11 months	The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy	11 months	The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.