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?

no such schema

schema used for heterogeneous replication

restricted schema for postgres internal usage only

default schema for user objects

2 / 20

2. What is the default standard size for a fork file?

5GB

1MB

1GB

5MB

3 / 20

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

obj#

oid

obj

oid#

4 / 20

4. What is the point of the pg_global tablespace?

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

stores WAL logs used for global replication

stores temporary tables that are common to the whole cluster

5 / 20

5. 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

6 / 20

6. What is the purpose of autovacuum?

Deletes old logs and traces on disk

Removes stale data from tables and indexes

Rebuilds indexes with b level greater than 2

Performs a backup of WAL logs

7 / 20

7. Files are logically split into pages?

True

False

8 / 20

8. Which fork is specific for unlogged tables?

visiblilty map

Initialization fork

Main fork

free space map

9 / 20

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

choose 2

pg_temp

pg_tablespace

pg_default

pg_global

10 / 20

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

False

True

11 / 20

11. What is the purpose of the template0 database?

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

Useful for Postgres support Services to debug issues

Useful for creating development schemas

No such database

12 / 20

12. TOAST tables reside in a seperate schema?

False

True

13 / 20

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

False

True

14 / 20

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

True

False

15 / 20

15. What is another name for the postgres process?

aurora

postmaster

masterprocess

postmanager

16 / 20

16. What is the name of the mechanism used to store a row bigger than a page size?

BAKE

TOAST

BREAD

GROW

17 / 20

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

False

True

18 / 20

18. Tablespaces are used to define physical data layout?

False

True

19 / 20

19. What is the purpose of wal writer?

writes WAL entries to disk

executes checkpoints

collects usage statistics for the instance.

flushes dirty pages to disk.

20 / 20

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

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

False

True

2 / 10

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

True

False

3 / 10

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

SAFE

HIPPA

SOC2

ACID

4 / 10

4. The SQL standard specifies three isolation levels?

True

False

5 / 10

5. What is the default Isolation Level?

Serializable

Repeatable Read

Read Uncommitted

Read Committed

6 / 10

6. Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Serializable

Rollback Read

Read Committed

7 / 10

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

True

False

8 / 10

8. 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 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.

9 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

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. If a transaction is read only which kind of Transaction ID is it allocated?

temporary XID

virtual XID

heap XID

magic XID

2 / 10

2. Page free space can often become fragmented?

False

True

3 / 10

3. psql provides a special mode that allows you to continue a transaction after a failure?

False

True

4 / 10

4. Which 2 of the below represent transaction IDs used for row versioning?

xtime

xmax

xmin

xid

5 / 10

5. indexes do not use row versioning?

True

False

6 / 10

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

True

False

7 / 10

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

True

False

8 / 10

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

False

True

9 / 10

9. To identify different versions of one and the same row, PostgreSQL marks each of them with which two value?

xmax

xmin

xmas

xid

10 / 10

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

pagedetect

pageheadinfo

pageinspect

pagesize

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.