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

2 / 20

2. What is a schema?

A memory area used to cache data from LRU chains

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

3 / 20

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

Directory Path

Schema Path

Access Path

Search Path

4 / 20

4. Each Database has its own System Catalog?

True

False

5 / 20

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

obj

oid#

oid

obj#

6 / 20

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

True

False

7 / 20

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

True

False

8 / 20

8. What is the name of the catalog that stores metadata for all cluster objects?

Sysasm Catalog

System Catalog

Sysaux Catalog

Sys Catalog

9 / 20

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

False

True

10 / 20

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

True

False

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 creating development schemas

Useful for Postgres support Services to debug issues

No such database

12 / 20

12. The pg_default tablespace should never be used to create user tables?

True

False

13 / 20

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

vacuum space map

free space map

used space map

wal space map

14 / 20

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

1MB

5GB

5MB

1GB

15 / 20

15. Tablespaces are used to define physical data layout?

False

True

16 / 20

16. System Catalog tables begin with which prefix?

sys_

pg_

cat_

dba_

17 / 20

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

18 / 20

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

choose 2

pg_tablespace

pg_temp

pg_default

pg_global

19 / 20

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

True

False

20 / 20

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

pg_system

pg_class

pg_catalog

pg_tables

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

False

True

2 / 10

2. The SQL standard specifies three isolation levels?

False

True

3 / 10

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

True

False

4 / 10

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

SOC2

SAFE

HIPPA

ACID

5 / 10

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

True

False

6 / 10

6. What is the default Isolation Level?

Serializable

Read Uncommitted

Repeatable Read

Read Committed

7 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

8 / 10

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

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

reading the data directly from file using a text editor such as vi or notepad

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

reading data direct from memory using pg_dirt

9 / 10

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

choose 3

Serializable

Read Committed

Repeatable Read

Read Uncommitted

10 / 10

10. 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 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 issue a rollback.

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

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

True

False

2 / 10

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

True

False

3 / 10

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

False

True

4 / 10

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

dump

view

heap

clog

5 / 10

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

choose 2

undo segment

flashback block

page header

free space

6 / 10

6. CLOG files are stored in which directory?

PGDATA/pg_xact

PGDATA/clog

PGDATA/pg_commit

PGDATA/pg_clog

7 / 10

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

Also know as the pages table of contents

Each pointer uses 4 bytes

stored in PGDATA/itemptr directory

Each pointer uses 8 bytes

8 / 10

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

False

True

9 / 10

9. When a transaction is committed Postgres uses a special <replace with answer> structure?

redo log

commit log

transaction log

archive log

10 / 10

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

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.