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 does Postgres know which schema to use if not specified?

Directory Path

Access Path

Search Path

Schema Path

2 / 20

2. What is the purpose of wal writer?

flushes dirty pages to disk.

writes WAL entries to disk

collects usage statistics for the instance.

executes checkpoints

3 / 20

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

True

False

4 / 20

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

TOAST

GROW

BAKE

BREAD

5 / 20

5. Which fork contains the actual table data?

visiblilty map

table map

free space map

Main fork

6 / 20

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

False

True

7 / 20

7. What is the point of the pg_global tablespace?

stores user tables that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

stores system catalog objects that are common to the whole cluster

8 / 20

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

9 / 20

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

init

pginit

postman

postgres

10 / 20

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

True

False

11 / 20

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

oid#

oid

obj

obj#

12 / 20

12. What is another name for the postgres process?

postmaster

aurora

postmanager

masterprocess

13 / 20

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

False

True

14 / 20

14. The default Page size is 2k?

False

True

15 / 20

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

Choose 2 option

Postgres Server

Aurora

Quorum

Instance

16 / 20

16. Tablespaces are used to define physical data layout?

False

True

17 / 20

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

pg_system

pg_tables

pg_class

pg_catalog

18 / 20

18. Which 3 databases exist directly after cluster initialization?

choose 3 options

postgres

template0

sysaux

template1

19 / 20

19. What is the purpose of the template0 database?

Useful for Postgres support Services to debug issues

Useful for creating development schemas

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

No such database

20 / 20

20. TOAST tables reside in a seperate schema?

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. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Random Scatter

Serializable

2 / 10

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

False

True

3 / 10

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

True

False

4 / 10

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

choose 3

Serializable

Read Uncommitted

Read Committed

Repeatable Read

5 / 10

5. A phantom read anomaly occurs when?

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

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 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

6 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

7 / 10

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

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 data direct from memory using pg_dirt

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

8 / 10

8. Which parameters sets the database default isolation level?

default_transaction_isolation

default_isolation_level

transaction_isolation_level

active_transaction_isolation

9 / 10

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

SAFE

SOC2

HIPPA

ACID

10 / 10

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

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

True

False

2 / 10

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

virtual XID

temporary XID

heap XID

magic XID

3 / 10

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

xmas

xid

xmax

xmin

4 / 10

4. UPDATE can be regarded as which 2 separate operations?

INSERT

COMMIT

MERGE

DELETE

5 / 10

5. 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

6 / 10

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

True

False

7 / 10

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

pg_current_xmin_id()

pg_current_id()

pg_current_commit_id()

pg_current_xact_id()

8 / 10

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

False

True

9 / 10

9. Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/pg_min

PGDATA/pg_xid

PGDATA/subtrans

10 / 10

10. Postgres table physical data files are always cross compatible across platforms?

False

True

Your score is

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