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 schema can belong to more than one database?

False

True

2 / 20

2. What is the name of the catalog that stores metadata for all cluster objects?

Sys Catalog

System Catalog

Sysaux Catalog

Sysasm Catalog

3 / 20

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

True

False

4 / 20

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

5 / 20

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

Initialize

StartNewPG

CreatePGC

CreateCluster

6 / 20

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

False

True

7 / 20

7. Who is the Author of the Postgres 14 Internals book?

Egor Rogov

Sam Altman

Dan Brown

Paul Sammy

8 / 20

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

BREAD

TOAST

GROW

BAKE

9 / 20

9. Tablespaces are used to define physical data layout?

False

True

10 / 20

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

postman

pginit

postgres

init

11 / 20

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

oid

obj#

obj

oid#

12 / 20

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

False

True

13 / 20

13. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

template1

sysaux

postgres

14 / 20

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

pg_tabspace

pg_tablespace

pg_symlinks

pg_tblspc

15 / 20

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

5MB

1MB

5GB

1GB

16 / 20

16. What is the point of the pg_global tablespace?

stores user tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

17 / 20

17. The default Page size is 2k?

False

True

18 / 20

18. Which of below are predefined schemas?

choose 3

information_schema

pg_temp

pg_toast

pg_schema

19 / 20

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

Schema Path

Search Path

Directory Path

Access Path

20 / 20

20. Which fork is specific for unlogged tables?

Initialization fork

visiblilty map

Main fork

free space 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. What is the default Isolation Level?

Read Uncommitted

Repeatable Read

Read Committed

Serializable

2 / 10

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

False

True

3 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

4 / 10

4. 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

reading data direct from memory using pg_dirt

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

5 / 10

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

choose 3

Serializable

Repeatable Read

Read Committed

Read Uncommitted

6 / 10

6. Data Consistency is best handled at the application layer rather than at the database layer?

True

False

7 / 10

7. 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 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

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 also queries this same data.

8 / 10

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

Serializable

Read Uncommitted

Repeatable Read

Read Committed

9 / 10

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

HIPPA

ACID

SOC2

SAFE

10 / 10

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

True

False

2 / 10

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

False

True

3 / 10

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

xmax

xmas

xmin

xid

4 / 10

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

INSERT

DELETE

MERGE

COMMIT

5 / 10

5. Rows of TOAST tables are handled in such a way that they are never update?

True

False

6 / 10

6. index row headers like table row headers contain xmin and xmax fields?

True

False

7 / 10

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

False

True

8 / 10

8. psql provides a special mode that allows you to continue a transaction after a failure?

False

True

9 / 10

9. Tuples can also be referred to as columns?

True

False

10 / 10

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

CREATE

INSERT

DELETE

COMMIT

Your score is

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