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

True

False

2 / 20

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

wal space map

free space map

used space map

vacuum space map

3 / 20

3. If we create a new tablespace which directory will symbolic links be created from?

pg_tablespace

pg_tabspace

pg_tblspc

pg_symlinks

4 / 20

4. What is a schema?

This is the same as a user in Postgres

The name used to refer to a super user account

Namespace that store all objects of a database

A memory area used to cache data from LRU chains

5 / 20

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

False

True

6 / 20

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

7 / 20

7. Postgres uses a thread based process model?

False

True

8 / 20

8. What is another name for the postgres process?

aurora

postmanager

masterprocess

postmaster

9 / 20

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

True

False

10 / 20

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

True

False

11 / 20

11. What is the name of the directory that contains the files related to the Postgres cluster?

PGBASE

PGTIPS

PGCORE

PGDATA

12 / 20

12. System Catalog tables begin with which prefix?

pg_

cat_

sys_

dba_

13 / 20

13. Which of below are predefined schemas?

choose 3

pg_schema

information_schema

pg_toast

pg_temp

14 / 20

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

False

True

15 / 20

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

postman

postgres

pginit

init

16 / 20

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

choose 3

indexes

sequences

tables

triggers

17 / 20

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

True

False

18 / 20

18. Users should not modify the template0 database

False

True

19 / 20

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

5GB

1GB

5MB

1MB

20 / 20

20. What is the purpose of the template1 database?

database used for temporary tables

a template for all the other databases

regular database that you can use at your discretion

No such database

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 would best describe a dirty read?

reading data direct from memory using pg_dirt

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

2 / 10

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

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

3 / 10

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

False

True

4 / 10

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

False

True

5 / 10

5. The SQL standard specifies three isolation levels?

True

False

6 / 10

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

True

False

7 / 10

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

SOC2

SAFE

HIPPA

ACID

8 / 10

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

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.

9 / 10

9. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Serializable

Random Scatter

10 / 10

10. What are some of database features we can use to avoid a non repeatable read?

Select more than 1 answer below:

Apply explicit locks

Use a single SQL operator

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

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

CREATE

COMMIT

DELETE

INSERT

2 / 10

2. Which function can we use to find the current transaction ID?

pg_current_xmin_id()

pg_current_id()

pg_current_xact_id()

pg_current_commit_id()

3 / 10

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

view

clog

dump

heap

4 / 10

4. What does an Item Pointer contain?

choose 3

tuple xid

tuple offset from the start of the page

tuple length

tuple status

5 / 10

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

pagedetect

pageinspect

pageheadinfo

pagesize

6 / 10

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

heap XID

temporary XID

magic XID

virtual XID

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?

True

False

9 / 10

9. status of a subtransaction is written into CLOG?

False

True

10 / 10

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

False

True

Your score is

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