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 template1 database?

regular database that you can use at your discretion

No such database

database used for temporary tables

a template for all the other databases

2 / 20

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

3 / 20

3. Files are logically split into pages?

False

True

4 / 20

4. Tablespaces are used to define physical data layout?

True

False

5 / 20

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

Sam Altman

Dan Brown

Egor Rogov

Paul Sammy

6 / 20

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

choose 3

tables

indexes

triggers

sequences

7 / 20

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

False

True

8 / 20

8. TOAST tables reside in a seperate schema?

False

True

9 / 20

9. What is the purpose of the visibility map?

provides the data decryption key

provides an audit trail for the database

shows a page to be vacuumed or frozen

shows referential relationships for tables

10 / 20

10. Which of below are predefined schemas?

choose 3

pg_temp

information_schema

pg_schema

pg_toast

11 / 20

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

Sys Catalog

Sysaux Catalog

System Catalog

Sysasm Catalog

12 / 20

12. What is the purpose of autovacuum?

Performs a backup of WAL logs

Rebuilds indexes with b level greater than 2

Removes stale data from tables and indexes

Deletes old logs and traces on disk

13 / 20

13. What is the purpose of the postgres database?

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

No such database

a template for all the other database

regular database that you can use at your discretion

14 / 20

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

pginit

postgres

postman

init

15 / 20

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

True

False

16 / 20

16. Users should not modify the template0 database

True

False

17 / 20

17. The default Page size is 2k?

True

False

18 / 20

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

PGCORE

PGBASE

PGDATA

PGTIPS

19 / 20

19. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

stores WAL logs used for global replication

20 / 20

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

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

Read Uncommitted

Serializable

Read Committed

Repeatable Read

2 / 10

2. What is the default Isolation Level?

Read Uncommitted

Read Committed

Repeatable Read

Serializable

3 / 10

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

choose 3

Repeatable Read

Serializable

Read Committed

Read Uncommitted

4 / 10

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

False

True

5 / 10

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

False

True

6 / 10

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

False

True

7 / 10

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

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

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

8 / 10

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

True

False

9 / 10

9. 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 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

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

10 / 10

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

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 offset from the start of the page

tuple length

tuple xid

tuple status

2 / 10

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

False

True

3 / 10

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

INSERT

DELETE

COMMIT

CREATE

4 / 10

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

virtual XID

magic XID

temporary XID

heap XID

5 / 10

5. The page Special Space is located at the start of the page with highest address

False

True

6 / 10

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

Each pointer uses 8 bytes

Each pointer uses 4 bytes

Also know as the pages table of contents

stored in PGDATA/itemptr directory

7 / 10

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

False

True

8 / 10

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

MERGE

DELETE

COMMIT

INSERT

9 / 10

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

True

False

10 / 10

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

pagesize

pageheadinfo

pagedetect

pageinspect

Your score is

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