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 the default standard size for a fork file?

1MB

1GB

5GB

5MB

2 / 20

2. What is the purpose of the public schema?

no such schema

schema used for heterogeneous replication

restricted schema for postgres internal usage only

default schema for user objects

3 / 20

3. Postgres uses a thread based process model?

False

True

4 / 20

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

used space map

vacuum space map

wal space map

free space map

5 / 20

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

True

False

6 / 20

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

Sysaux Catalog

System Catalog

Sysasm Catalog

Sys Catalog

7 / 20

7. To understand each other, a client and a server must use one and the same interfacing protocol?

False

True

8 / 20

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

True

False

9 / 20

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

GROW

TOAST

BREAD

BAKE

10 / 20

10. Which 3 databases exist directly after cluster initialization?

choose 3 options

postgres

sysaux

template0

template1

11 / 20

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

False

True

12 / 20

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

False

True

13 / 20

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

False

True

14 / 20

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

True

False

15 / 20

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

pg_tables

pg_system

pg_class

pg_catalog

16 / 20

16. What is a schema?

Namespace that store all objects of a database

This is the same as a user in Postgres

A memory area used to cache data from LRU chains

The name used to refer to a super user account

17 / 20

17. Which fork contains the actual table data?

Main fork

table map

free space map

visiblilty map

18 / 20

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

Sam Altman

Paul Sammy

Dan Brown

Egor Rogov

19 / 20

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

True

False

20 / 20

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

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. The SQL standard specifies three isolation levels?

False

True

2 / 10

2. 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

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

Apply explicit locks

3 / 10

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

HIPPA

SAFE

SOC2

ACID

4 / 10

4. What is the default Isolation Level?

Repeatable Read

Read Committed

Serializable

Read Uncommitted

5 / 10

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

True

False

6 / 10

6. 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 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.

7 / 10

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

Serializable

Read Committed

Repeatable Read

Read Uncommitted

8 / 10

8. Which parameters sets the database default isolation level?

active_transaction_isolation

default_transaction_isolation

default_isolation_level

transaction_isolation_level

9 / 10

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

True

False

10 / 10

10. A phantom read anomaly occurs when?

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.

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 transactions issues a commit, then a rollback to restore data to its original value

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

False

True

3 / 10

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

MERGE

DELETE

INSERT

COMMIT

4 / 10

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

True

False

5 / 10

5. If a transaction aborts, all page changes are reverted(rolled back) in place?

True

False

6 / 10

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

True

False

7 / 10

7. What does an Item Pointer contain?

choose 3

tuple length

tuple status

tuple xid

tuple offset from the start of the page

8 / 10

8. CLOG Pages are never cached in memory?

True

False

9 / 10

9. Tuples can also be referred to as columns?

True

False

10 / 10

10. When a transaction is committed Postgres uses a special <replace with answer> structure?

archive log

transaction log

redo log

commit log

Your score is

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