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. What is the purpose of the postgres database?

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

a template for all the other database

No such database

regular database that you can use at your discretion

2 / 20

2. How many rows in a page does Postgres aim to have before considering TOAST?

3 / 20

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

pg_symlinks

pg_tblspc

pg_tabspace

pg_tablespace

4 / 20

4. What is a schema?

This is the same as a user in Postgres

Namespace that store all objects of a database

A memory area used to cache data from LRU chains

The name used to refer to a super user account

5 / 20

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

False

True

6 / 20

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

False

True

7 / 20

7. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

stores user tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

8 / 20

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

True

False

9 / 20

9. The default Page size is 2k?

False

True

10 / 20

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

choose 2

pg_default

pg_tablespace

pg_global

pg_temp

11 / 20

11. System Catalog tables begin with which prefix?

cat_

pg_

sys_

dba_

12 / 20

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

True

False

13 / 20

13. Tablespaces are used to define physical data layout?

True

False

14 / 20

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

True

False

15 / 20

15. Files are logically split into pages?

False

True

16 / 20

16. What 3 files/forks as a minimum make up a table on disk?

free space map

visiblilty map

table map

Main fork

17 / 20

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

choose 3

indexes

sequences

tables

triggers

18 / 20

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

1MB

1GB

5GB

5MB

19 / 20

19. Which fork is specific for unlogged tables?

free space map

visiblilty map

Initialization fork

Main fork

20 / 20

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

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. The SQL standard specifies three isolation levels?

False

True

2 / 10

2. 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 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 and commits the change.

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

3 / 10

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

False

True

4 / 10

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

True

False

5 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

6 / 10

6. 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 also queries this same data.

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.

A transactions inserts a null value into a not null columns and commits

7 / 10

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

SAFE

HIPPA

SOC2

ACID

8 / 10

8. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Random Scatter

Rollback Read

Serializable

9 / 10

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

True

False

10 / 10

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

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. The page header is located in the highest address?

False

True

2 / 10

2. CLOG Pages are never cached in memory?

False

True

3 / 10

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

False

True

4 / 10

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

pagesize

pagedetect

pageheadinfo

pageinspect

5 / 10

5. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/pg_subtrans

PGDATA/subtrans

PGDATA/pg_min

6 / 10

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

False

True

7 / 10

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

xmax

xid

xmin

xmas

8 / 10

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

choose 2

free space

flashback block

undo segment

page header

9 / 10

9. The page header stores checksum and the sizes of the other parts of the page?

False

True

10 / 10

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

False

True

Your score is

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