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?

False

True

2 / 20

2. TOAST tables reside in a seperate schema?

True

False

3 / 20

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

pg_symlinks

pg_tablespace

pg_tblspc

pg_tabspace

4 / 20

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

False

True

5 / 20

5. What is a schema?

The name used to refer to a super user account

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

6 / 20

6. Which fork is specific for unlogged tables?

Main fork

Initialization fork

free space map

visiblilty map

7 / 20

7. Some System Catalog tables are common to all databases in the cluster?

False

True

8 / 20

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

wal space map

free space map

vacuum space map

used space map

9 / 20

9. What is another name for the postgres process?

postmaster

postmanager

aurora

masterprocess

10 / 20

10. What is the purpose of autovacuum?

Deletes old logs and traces on disk

Performs a backup of WAL logs

Removes stale data from tables and indexes

Rebuilds indexes with b level greater than 2

11 / 20

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

pg_tables

pg_catalog

pg_class

pg_system

12 / 20

12. Tablespaces are used to define physical data layout?

False

True

13 / 20

13. System Catalog tables begin with which prefix?

sys_

cat_

pg_

dba_

14 / 20

14. Each Database has its own System Catalog?

True

False

15 / 20

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

PGBASE

PGCORE

PGDATA

PGTIPS

16 / 20

16. The default Page size is 2k?

False

True

17 / 20

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

True

False

18 / 20

18. What is the point of the pg_global tablespace?

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores user tables that are common to the whole cluster

stores WAL logs used for global replication

19 / 20

19. What is the purpose of the template1 database?

a template for all the other databases

database used for temporary tables

regular database that you can use at your discretion

No such database

20 / 20

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

False

True

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 parameters sets the database default isolation level?

default_isolation_level

default_transaction_isolation

active_transaction_isolation

transaction_isolation_level

2 / 10

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

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

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

reading data direct from memory using pg_dirt

3 / 10

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

False

True

4 / 10

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

choose 3

Read Uncommitted

Serializable

Read Committed

Repeatable Read

5 / 10

5. What is the default Isolation Level?

Serializable

Read Uncommitted

Read Committed

Repeatable Read

6 / 10

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

True

False

7 / 10

7. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Serializable

Random Scatter

8 / 10

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

HIPPA

SOC2

ACID

SAFE

9 / 10

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

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

heap XID

temporary XID

magic XID

virtual XID

2 / 10

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

choose 2

flashback block

page header

free space

undo segment

3 / 10

3. indexes do not use row versioning?

True

False

4 / 10

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

backend process ID

sequential number

xmin

checksum

5 / 10

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

True

False

6 / 10

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

Each pointer uses 4 bytes

Also know as the pages table of contents

Each pointer uses 8 bytes

stored in PGDATA/itemptr directory

7 / 10

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

transaction log

commit log

redo log

archive log

8 / 10

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

MERGE

COMMIT

DELETE

INSERT

9 / 10

9. Information about subtransactions is stored under?

PGDATA/subtrans

PGDATA/pg_xid

PGDATA/pg_subtrans

PGDATA/pg_min

10 / 10

10. status of a subtransaction is written into CLOG?

False

True

Your score is

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