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. Which fork keeps track of available space within pages?

wal space map

used space map

vacuum space map

free space map

2 / 20

2. What is the purpose of the template1 database?

No such database

regular database that you can use at your discretion

a template for all the other databases

database used for temporary tables

3 / 20

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

4 / 20

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

BREAD

GROW

BAKE

TOAST

5 / 20

5. What is the purpose of autovacuum?

Removes stale data from tables and indexes

Performs a backup of WAL logs

Rebuilds indexes with b level greater than 2

Deletes old logs and traces on disk

6 / 20

6. What command is used to create the Postgres cluster?

CreatePGC

Initialize

CreateCluster

StartNewPG

7 / 20

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

choose 2

pg_default

pg_temp

pg_global

pg_tablespace

8 / 20

8. System Catalog tables begin with which prefix?

cat_

sys_

pg_

dba_

9 / 20

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

pg_class

pg_tables

pg_system

pg_catalog

10 / 20

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

True

False

11 / 20

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

False

True

12 / 20

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

Choose 2 option

Aurora

Quorum

Postgres Server

Instance

13 / 20

13. TOAST tables reside in a seperate schema?

False

True

14 / 20

14. Users should not modify the template0 database

False

True

15 / 20

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

True

False

16 / 20

16. Which fork contains the actual table data?

table map

free space map

Main fork

visiblilty map

17 / 20

17. To be able to restore data consistency, Postgres maintains

rollback segments (RBS)

undo segments (UNDO)

online redo logs (ORL)

write-ahead log (WAL)

18 / 20

18. 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

19 / 20

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

True

False

20 / 20

20. What is the purpose of the template0 database?

Useful for Postgres support Services to debug issues

No such database

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

Useful for creating development schemas

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

True

False

2 / 10

2. The SQL standard specifies three isolation levels?

True

False

3 / 10

3. Which parameters sets the database default isolation level?

default_transaction_isolation

active_transaction_isolation

transaction_isolation_level

default_isolation_level

4 / 10

4. Which isolation level in theory could mean an application does not have to consider isolation anomalies?

Serializable

Read Uncommitted

Repeatable Read

Read Committed

5 / 10

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

True

False

6 / 10

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

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

reading data direct from memory using pg_dirt

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

7 / 10

7. What is the default Isolation Level?

Read Committed

Serializable

Read Uncommitted

Repeatable Read

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 issue a rollback.

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 once, another transaction modifies this row between these reads and commits the change.

A transaction reads one and the same row once and modifies this row and commits the change.

9 / 10

9. Which of the below are valid Isolations Levels?

choose 2

Serializable

Read Committed

Rollback Read

Random Scatter

10 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

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. UPDATE can be regarded as which 2 separate operations?

INSERT

COMMIT

DELETE

MERGE

3 / 10

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

archive log

transaction log

commit log

redo log

4 / 10

4. status of a subtransaction is written into CLOG?

True

False

5 / 10

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

False

True

6 / 10

6. Which 2 items does a Virtual XID consist of?

sequential number

xmin

checksum

backend process ID

7 / 10

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

False

True

8 / 10

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

Each pointer uses 8 bytes

Also know as the pages table of contents

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

9 / 10

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

pageheadinfo

pagesize

pageinspect

pagedetect

10 / 10

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

True

False

Your score is

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