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 a schema?

Namespace that store all objects of a database

The name used to refer to a super user account

A memory area used to cache data from LRU chains

This is the same as a user in Postgres

2 / 20

2. What is the purpose of the public schema?

no such schema

schema used for heterogeneous replication

default schema for user objects

restricted schema for postgres internal usage only

3 / 20

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

4 / 20

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

Access Path

Search Path

Directory Path

Schema Path

5 / 20

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

Dan Brown

Sam Altman

Egor Rogov

Paul Sammy

6 / 20

6. Which of below are predefined schemas?

choose 3

information_schema

pg_temp

pg_schema

pg_toast

7 / 20

7. What is another name for the postgres process?

postmaster

postmanager

aurora

masterprocess

8 / 20

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

True

False

9 / 20

9. What is the name of the mechanism used to store a row bigger than a page size?

BREAD

TOAST

GROW

BAKE

10 / 20

10. System Catalog tables begin with which prefix?

cat_

pg_

sys_

dba_

11 / 20

11. What is the purpose of the postgres database?

regular database that you can use at your discretion

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

a template for all the other database

No such database

12 / 20

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

13 / 20

13. Which of below are predefined schemas?

choose 2

system

pg_catalog

postgres

public

14 / 20

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

System Catalog

Sysaux Catalog

Sys Catalog

Sysasm Catalog

15 / 20

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

5GB

5MB

1MB

1GB

16 / 20

16. The information_schema schema provides information on Postgres release notes?

True

False

17 / 20

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

True

False

18 / 20

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

False

True

19 / 20

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

PGCORE

PGTIPS

PGBASE

PGDATA

20 / 20

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

True

False

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

True

False

2 / 10

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

False

True

3 / 10

3. Which parameters sets the database default isolation level?

default_transaction_isolation

default_isolation_level

transaction_isolation_level

active_transaction_isolation

4 / 10

4. 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 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.

5 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

6 / 10

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

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

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

reading the data directly from file using a text editor such as vi or notepad

reading data direct from memory using pg_dirt

7 / 10

7. 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

Apply explicit locks

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

8 / 10

8. The SQL standard specifies three isolation levels?

False

True

9 / 10

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

choose 3

Read Committed

Repeatable Read

Serializable

Read Uncommitted

10 / 10

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

SOC2

SAFE

ACID

HIPPA

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?

False

True

2 / 10

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

heap XID

magic XID

virtual XID

temporary XID

3 / 10

3. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/subtrans

PGDATA/pg_min

PGDATA/pg_subtrans

4 / 10

4. indexes do not use row versioning?

True

False

5 / 10

5. What does an Item Pointer contain?

choose 3

tuple xid

tuple offset from the start of the page

tuple length

tuple status

6 / 10

6. CLOG Pages are never cached in memory?

True

False

7 / 10

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

choose 2

flashback block

free space

undo segment

page header

8 / 10

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

False

True

9 / 10

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

MERGE

COMMIT

INSERT

DELETE

10 / 10

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

pg_current_xact_id()

pg_current_xmin_id()

pg_current_id()

pg_current_commit_id()

Your score is

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