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. Postgres by default has built in connection pooling abilities?

False

True

2 / 20

2. System Catalog tables begin with which prefix?

sys_

cat_

dba_

pg_

3 / 20

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

choose 2

pg_tablespace

pg_global

pg_default

pg_temp

4 / 20

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

StartNewPG

CreatePGC

CreateCluster

Initialize

5 / 20

5. What is the purpose of the template0 database?

Useful for Postgres support Services to debug issues

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

No such database

Useful for creating development schemas

6 / 20

6. Users should not modify the template0 database

True

False

7 / 20

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

Choose 2 option

Postgres Server

Aurora

Quorum

Instance

8 / 20

8. What is the purpose of the template1 database?

database used for temporary tables

regular database that you can use at your discretion

No such database

a template for all the other databases

9 / 20

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

False

True

10 / 20

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

pg_symlinks

pg_tablespace

pg_tblspc

pg_tabspace

11 / 20

11. A schema can belong to more than one database?

True

False

12 / 20

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

True

False

13 / 20

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

rollback segments (RBS)

online redo logs (ORL)

undo segments (UNDO)

write-ahead log (WAL)

14 / 20

14. What is another name for the postgres process?

postmanager

postmaster

masterprocess

aurora

15 / 20

15. Files are logically split into pages?

True

False

16 / 20

16. Postgres uses a thread based process model?

False

True

17 / 20

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

False

True

18 / 20

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

True

False

19 / 20

19. What is the point of the pg_global tablespace?

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

stores temporary tables that are common to the whole cluster

20 / 20

20. A single Postgres Instance can server only one database?

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

ACID

SOC2

SAFE

HIPPA

2 / 10

2. The SQL standard specifies three isolation levels?

False

True

3 / 10

3. Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Read Committed

Rollback Read

Serializable

4 / 10

4. What is the default Isolation Level?

Repeatable Read

Read Committed

Read Uncommitted

Serializable

5 / 10

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

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

Replace procedural code with declarative one.

Use a single SQL operator

6 / 10

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

False

True

7 / 10

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

Read Committed

Repeatable Read

Read Uncommitted

Serializable

8 / 10

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

False

True

9 / 10

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

False

True

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 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.

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. Which function can we use to find the current transaction ID?

pg_current_id()

pg_current_commit_id()

pg_current_xact_id()

pg_current_xmin_id()

2 / 10

2. What does an Item Pointer contain?

choose 3

tuple length

tuple xid

tuple offset from the start of the page

tuple status

3 / 10

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

False

True

4 / 10

4. Tuples can also be referred to as columns?

True

False

5 / 10

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

False

True

6 / 10

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

False

True

7 / 10

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

xmas

xmin

xid

xmax

8 / 10

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

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

Each pointer uses 8 bytes

Also know as the pages table of contents

9 / 10

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

choose 2

free space

undo segment

flashback block

page header

10 / 10

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

False

True

Your score is

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