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?

default schema for user objects

restricted schema for postgres internal usage only

schema used for heterogeneous replication

no such schema

2 / 20

2. What is another name for the postgres process?

masterprocess

postmanager

aurora

postmaster

3 / 20

3. Which 3 databases exist directly after cluster initialization?

choose 3 options

template1

postgres

template0

sysaux

4 / 20

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

choose 2

pg_default

pg_tablespace

pg_temp

pg_global

5 / 20

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

True

False

6 / 20

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

7 / 20

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

8 / 20

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

Search Path

Schema Path

Directory Path

Access Path

9 / 20

9. Which fork is specific for unlogged tables?

free space map

Initialization fork

Main fork

visiblilty map

10 / 20

10. System Catalog tables begin with which prefix?

dba_

cat_

sys_

pg_

11 / 20

11. What is the purpose of the template1 database?

regular database that you can use at your discretion

database used for temporary tables

No such database

a template for all the other databases

12 / 20

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

postgres

postman

init

pginit

13 / 20

13. Which of the below objects can be referred to as relations?

choose 3

tables

sequences

triggers

indexes

14 / 20

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

True

False

15 / 20

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

GROW

BREAD

TOAST

BAKE

16 / 20

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

True

False

17 / 20

17. What is the purpose of the postgres database?

regular database that you can use at your discretion

a template for all the other database

No such database

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

18 / 20

18. Users should not modify the template0 database

False

True

19 / 20

19. A Postgres cluster consists of 2 or more physical servers accessing one Postgres Instance?

True

False

20 / 20

20. Which fork contains the actual table data?

free space map

Main fork

visiblilty map

table map

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 of the below are valid Isolations Levels?

choose 2

Rollback Read

Serializable

Random Scatter

Read Committed

2 / 10

2. 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.

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 adds some other rows satisfying this condition and commits.

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

3 / 10

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

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

True

False

6 / 10

6. The SQL standard specifies three isolation levels?

True

False

7 / 10

7. What is the default Isolation Level?

Repeatable Read

Serializable

Read Uncommitted

Read Committed

8 / 10

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

choose 3

Repeatable Read

Read Uncommitted

Read Committed

Serializable

9 / 10

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

SOC2

SAFE

HIPPA

ACID

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 and commits the change.

A transaction reads one and the same row twice, another transaction modifies this row between these reads issue a rollback.

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?

False

True

2 / 10

2. When a row is created, its xmin value is set to the transaction ID of which command?

CREATE

DELETE

COMMIT

INSERT

3 / 10

3. The page header stores checksum and the sizes of the other parts of the page?

True

False

4 / 10

4. at any one time Postgres can have several versions of a row?

True

False

5 / 10

5. What does an Item Pointer contain?

choose 3

tuple xid

tuple length

tuple status

tuple offset from the start of the page

6 / 10

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

False

True

7 / 10

7. Page free space can often become fragmented?

False

True

8 / 10

8. CLOG files are stored in which directory?

PGDATA/clog

PGDATA/pg_clog

PGDATA/pg_commit

PGDATA/pg_xact

9 / 10

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

False

True

10 / 10

10. CLOG Pages are never cached in memory?

False

True

Your score is

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