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

Paul Sammy

Egor Rogov

Sam Altman

Dan Brown

2 / 20

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

postman

pginit

init

postgres

3 / 20

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

Search Path

Directory Path

Schema Path

Access Path

4 / 20

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

True

False

5 / 20

5. Postgres uses a thread based process model?

False

True

6 / 20

6. What is the purpose of wal writer?

collects usage statistics for the instance.

executes checkpoints

flushes dirty pages to disk.

writes WAL entries to disk

7 / 20

7. The default Page size is 2k?

True

False

8 / 20

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

False

True

9 / 20

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

5GB

1MB

1GB

5MB

10 / 20

10. Which of below are predefined schemas?

choose 3

pg_temp

pg_toast

information_schema

pg_schema

11 / 20

11. To understand each other, a client and a server must use one and the same interfacing protocol?

True

False

12 / 20

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

False

True

13 / 20

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

online redo logs (ORL)

undo segments (UNDO)

write-ahead log (WAL)

rollback segments (RBS)

14 / 20

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

wal space map

vacuum space map

free space map

used space map

15 / 20

15. 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

16 / 20

16. Tablespaces are used to define physical data layout?

True

False

17 / 20

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

Sys Catalog

System Catalog

Sysasm Catalog

Sysaux Catalog

18 / 20

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

PGCORE

PGBASE

PGTIPS

PGDATA

19 / 20

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

False

True

20 / 20

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

Choose 2 option

Quorum

Postgres Server

Aurora

Instance

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

Rollback Read

Random Scatter

Serializable

Read Committed

2 / 10

2. 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

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

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

3 / 10

3. What are some of database features we can use to avoid a non repeatable read?

Select more than 1 answer below:

Apply explicit locks

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

Use a single SQL operator

4 / 10

4. 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.

5 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

6 / 10

6. The SQL standard specifies three isolation levels?

True

False

7 / 10

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

Read Uncommitted

Read Committed

Serializable

Repeatable Read

8 / 10

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

True

False

9 / 10

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

ACID

SOC2

SAFE

HIPPA

10 / 10

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

False

True

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. What does an Item Pointer contain?

choose 3

tuple xid

tuple status

tuple length

tuple offset from the start of the page

2 / 10

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

True

False

3 / 10

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

True

False

4 / 10

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

True

False

5 / 10

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

archive log

transaction log

redo log

commit log

6 / 10

6. status of a subtransaction is written into CLOG?

False

True

7 / 10

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

xid

xmin

xmax

xmas

8 / 10

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

INSERT

COMMIT

DELETE

CREATE

9 / 10

9. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/pg_subtrans

PGDATA/pg_min

PGDATA/subtrans

10 / 10

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

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

Also know as the pages table of contents

Each pointer uses 8 bytes

Your score is

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