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

False

True

2 / 20

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

Sysaux Catalog

Sys Catalog

System Catalog

Sysasm Catalog

3 / 20

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

Sam Altman

Dan Brown

Paul Sammy

Egor Rogov

4 / 20

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

True

False

5 / 20

5. What is the purpose of the template1 database?

regular database that you can use at your discretion

database used for temporary tables

a template for all the other databases

No such database

6 / 20

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

pg_tblspc

pg_symlinks

pg_tabspace

pg_tablespace

7 / 20

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

True

False

8 / 20

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

choose 3

triggers

sequences

tables

indexes

9 / 20

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

10 / 20

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

free space map

wal space map

vacuum space map

used space map

11 / 20

11. 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

12 / 20

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

Access Path

Schema Path

Search Path

Directory Path

13 / 20

13. Files are logically split into pages?

True

False

14 / 20

14. TOAST tables reside in a seperate schema?

True

False

15 / 20

15. Which fork is specific for unlogged tables?

free space map

Main fork

Initialization fork

visiblilty map

16 / 20

16. System Catalog tables begin with which prefix?

sys_

dba_

pg_

cat_

17 / 20

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

False

True

18 / 20

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

pg_tables

pg_class

pg_system

pg_catalog

19 / 20

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

True

False

20 / 20

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

online redo logs (ORL)

undo segments (UNDO)

write-ahead log (WAL)

rollback segments (RBS)

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?

HIPPA

SOC2

SAFE

ACID

2 / 10

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

True

False

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 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 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.

5 / 10

5. What is the default Isolation Level?

Serializable

Read Committed

Read Uncommitted

Repeatable Read

6 / 10

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

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

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

reading data direct from memory using pg_dirt

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

7 / 10

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

Serializable

Read Uncommitted

Repeatable Read

Read Committed

8 / 10

8. A phantom read anomaly occurs when?

A transactions inserts a null value into a not null columns and commits

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

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.

9 / 10

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

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

10 / 10

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

Select more than 1 answer below:

Replace procedural code with declarative one.

Apply explicit locks

Use a single SQL operator

Issues a rollback after the commit to satisfy repeatable read.

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. Postgres table physical data files are always cross compatible across platforms?

True

False

2 / 10

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

True

False

3 / 10

3. The page header is located in the highest address?

False

True

4 / 10

4. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/subtrans

PGDATA/pg_min

PGDATA/pg_subtrans

5 / 10

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

True

False

6 / 10

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

False

True

7 / 10

7. Page header sizes can be easily displayed using the <choose from answers> extension

pageheadinfo

pagesize

pageinspect

pagedetect

8 / 10

8. Tuples can also be referred to as columns?

False

True

9 / 10

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

archive log

redo log

transaction log

commit log

10 / 10

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

pg_current_id()

pg_current_xmin_id()

pg_current_commit_id()

pg_current_xact_id()

Your score is

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