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?

True

False

2 / 20

2. Tablespaces are used to define physical data layout?

True

False

3 / 20

3. What is the purpose of the template1 database?

a template for all the other databases

regular database that you can use at your discretion

No such database

database used for temporary tables

4 / 20

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

True

False

5 / 20

5. What is the purpose of the visibility map?

provides the data decryption key

shows referential relationships for tables

provides an audit trail for the database

shows a page to be vacuumed or frozen

6 / 20

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

obj#

oid

oid#

obj

7 / 20

7. What is the purpose of wal writer?

flushes dirty pages to disk.

executes checkpoints

collects usage statistics for the instance.

writes WAL entries to disk

8 / 20

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

False

True

9 / 20

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

True

False

10 / 20

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

table map

visiblilty map

Main fork

free space map

11 / 20

11. What is another name for the postgres process?

masterprocess

postmaster

postmanager

aurora

12 / 20

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

13 / 20

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

free space map

wal space map

used space map

vacuum space map

14 / 20

14. What is a schema?

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

The name used to refer to a super user account

15 / 20

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

choose 3

tables

sequences

triggers

indexes

16 / 20

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

True

False

17 / 20

17. TOAST tables reside in a seperate schema?

False

True

18 / 20

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

System Catalog

Sysaux Catalog

Sysasm Catalog

Sys Catalog

19 / 20

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

PGDATA

PGCORE

PGBASE

PGTIPS

20 / 20

20. Which 3 databases exist directly after cluster initialization?

choose 3 options

template1

sysaux

template0

postgres

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

False

True

2 / 10

2. The SQL standard specifies three isolation levels?

False

True

3 / 10

3. non-repeatable read anomaly occurs when?

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.

A transaction reads one and the same row twice, another transaction modifies this row between these reads issue a rollback.

4 / 10

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

True

False

5 / 10

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

True

False

6 / 10

6. Which parameters sets the database default isolation level?

active_transaction_isolation

default_isolation_level

transaction_isolation_level

default_transaction_isolation

7 / 10

7. What is the default Isolation Level?

Repeatable Read

Read Uncommitted

Read Committed

Serializable

8 / 10

8. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Read Committed

Serializable

Random Scatter

9 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

10 / 10

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

choose 3

Read Uncommitted

Repeatable Read

Serializable

Read Committed

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?

True

False

2 / 10

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

False

True

3 / 10

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

False

True

4 / 10

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

heap XID

temporary XID

virtual XID

magic XID

5 / 10

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

INSERT

COMMIT

DELETE

CREATE

6 / 10

6. a transaction containing a savepoint is will still be considered as only a single transaction?

False

True

7 / 10

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

False

True

8 / 10

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

choose 2

free space

page header

flashback block

undo segment

9 / 10

9. Page free space can often become fragmented?

False

True

10 / 10

10. indexes do not use row versioning?

False

True

Your score is

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