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. Which fork keeps track of available space within pages?

used space map

free space map

vacuum space map

wal space map

2 / 20

2. What is the purpose of the postgres database?

a template for all the other database

regular database that you can use at your discretion

No such database

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

3 / 20

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

False

True

4 / 20

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

5 / 20

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

True

False

6 / 20

6. System Catalog tables begin with which prefix?

cat_

pg_

dba_

sys_

7 / 20

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

Search Path

Directory Path

Schema Path

Access Path

8 / 20

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

True

False

9 / 20

9. Which of below are predefined schemas?

choose 2

postgres

pg_catalog

system

public

10 / 20

10. What is another name for the postgres process?

aurora

postmanager

postmaster

masterprocess

11 / 20

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

PGCORE

PGTIPS

PGBASE

PGDATA

12 / 20

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

Sam Altman

Paul Sammy

Egor Rogov

Dan Brown

13 / 20

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

True

False

14 / 20

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

pg_class

pg_tables

pg_catalog

pg_system

15 / 20

15. 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 WAL logs used for global replication

stores user tables that are common to the whole cluster

16 / 20

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

Sysasm Catalog

System Catalog

Sysaux Catalog

Sys Catalog

17 / 20

17. What is the purpose of the public schema?

restricted schema for postgres internal usage only

no such schema

schema used for heterogeneous replication

default schema for user objects

18 / 20

18. Users should not modify the template0 database

True

False

19 / 20

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

Main fork

free space map

visiblilty map

table map

20 / 20

20. What is the purpose of the visibility map?

shows referential relationships for tables

provides an audit trail for the database

shows a page to be vacuumed or frozen

provides the data decryption key

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 Committed

Repeatable Read

Read Uncommitted

Serializable

2 / 10

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

ACID

SAFE

HIPPA

SOC2

3 / 10

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

True

False

4 / 10

4. non-repeatable read anomaly occurs when?

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, 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.

5 / 10

5. A phantom read anomaly occurs when?

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

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.

6 / 10

6. What is the default Isolation Level?

Serializable

Repeatable Read

Read Uncommitted

Read Committed

7 / 10

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

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

8 / 10

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

False

True

9 / 10

9. The SQL standard specifies three isolation levels?

False

True

10 / 10

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

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

clog

heap

view

dump

2 / 10

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

MERGE

INSERT

COMMIT

DELETE

3 / 10

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

False

True

4 / 10

4. Tuples can also be referred to as columns?

False

True

5 / 10

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

True

False

6 / 10

6. indexes do not use row versioning?

False

True

7 / 10

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

False

True

8 / 10

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

True

False

9 / 10

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

True

False

10 / 10

10. 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

Your score is

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