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. Tablespaces are used to define physical data layout?

False

True

2 / 20

2. TOAST tables reside in a seperate schema?

True

False

3 / 20

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

4 / 20

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

True

False

5 / 20

5. What is the purpose of the template1 database?

regular database that you can use at your discretion

a template for all the other databases

database used for temporary tables

No such database

6 / 20

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

True

False

7 / 20

7. 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 temporary tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

8 / 20

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

System Catalog

Sys Catalog

Sysaux Catalog

Sysasm Catalog

9 / 20

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

choose 3

sequences

triggers

tables

indexes

10 / 20

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

True

False

11 / 20

11. What is the purpose of the postgres database?

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

regular database that you can use at your discretion

a template for all the other database

No such database

12 / 20

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

5GB

1MB

1GB

5MB

13 / 20

13. Which fork contains the actual table data?

table map

free space map

visiblilty map

Main fork

14 / 20

14. Which fork is specific for unlogged tables?

Initialization fork

visiblilty map

free space map

Main fork

15 / 20

15. What is the name of the system catalog table for relations?

pg_class

pg_system

pg_tables

pg_catalog

16 / 20

16. The default Page size is 2k?

True

False

17 / 20

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

Choose 2 option

Postgres Server

Quorum

Aurora

Instance

18 / 20

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

True

False

19 / 20

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

PGTIPS

PGBASE

PGCORE

PGDATA

20 / 20

20. What is the purpose of the public schema?

schema used for heterogeneous replication

no such schema

default schema for user objects

restricted schema for postgres internal usage only

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

Serializable

Read Committed

Rollback Read

Random Scatter

2 / 10

2. Lost updates are forbidden by the standard at all 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 issue a rollback.

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.

4 / 10

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

Read Committed

Serializable

Read Uncommitted

Repeatable Read

5 / 10

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

choose 3

Read Committed

Serializable

Repeatable Read

Read Uncommitted

6 / 10

6. A phantom read anomaly occurs when?

A transactions inserts a null value into a not null columns 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 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 transactions issues a commit, then a rollback to restore data to its original value

7 / 10

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

False

True

8 / 10

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

Select more than 1 answer below:

Use a single SQL operator

Replace procedural code with declarative one.

Apply explicit locks

Issues a rollback after the commit to satisfy repeatable read.

9 / 10

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

True

False

10 / 10

10. The SQL standard specifies three isolation levels?

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 stores checksum and the sizes of the other parts of the page?

True

False

2 / 10

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

xmax

xid

xmin

xmas

3 / 10

3. In Postgres, tables are often referred to as which of the below?

dump

view

heap

clog

4 / 10

4. Tuples can also be referred to as columns?

True

False

5 / 10

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

True

False

6 / 10

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

False

True

7 / 10

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

Also know as the pages table of contents

Each pointer uses 4 bytes

Each pointer uses 8 bytes

stored in PGDATA/itemptr directory

8 / 10

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

DELETE

INSERT

COMMIT

MERGE

9 / 10

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

False

True

10 / 10

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

True

False

Your score is

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