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

True

False

2 / 20

2. What is the name of the 2 default tablespaces created after initialization?

choose 2

pg_tablespace

pg_default

pg_temp

pg_global

3 / 20

3. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

postgres

sysaux

template1

4 / 20

4. Each Database has its own System Catalog?

True

False

5 / 20

5. What is the process first launched at server start?

postman

postgres

pginit

init

6 / 20

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

System Catalog

Sysaux Catalog

Sys Catalog

Sysasm Catalog

7 / 20

7. What is the purpose of the postgres database?

regular database that you can use at your discretion

No such database

a template for all the other database

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

8 / 20

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

pg_tables

pg_system

pg_class

pg_catalog

9 / 20

9. What is the purpose of the template1 database?

database used for temporary tables

regular database that you can use at your discretion

a template for all the other databases

No such database

10 / 20

10. Each tablespaces can only be assigned for use by one database

False

True

11 / 20

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

pg_symlinks

pg_tblspc

pg_tabspace

pg_tablespace

12 / 20

12. Which fork is specific for unlogged tables?

Initialization fork

Main fork

visiblilty map

free space map

13 / 20

13. Which of below are predefined schemas?

choose 3

pg_temp

pg_schema

information_schema

pg_toast

14 / 20

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

visiblilty map

free space map

Main fork

table map

15 / 20

15. What is the purpose of the public schema?

default schema for user objects

schema used for heterogeneous replication

no such schema

restricted schema for postgres internal usage only

16 / 20

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

Choose 2 option

Postgres Server

Aurora

Instance

Quorum

17 / 20

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

PGTIPS

PGDATA

PGBASE

PGCORE

18 / 20

18. What is the purpose of autovacuum?

Removes stale data from tables and indexes

Deletes old logs and traces on disk

Performs a backup of WAL logs

Rebuilds indexes with b level greater than 2

19 / 20

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

choose 3

triggers

sequences

tables

indexes

20 / 20

20. System Catalog tables begin with which prefix?

dba_

sys_

cat_

pg_

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?

SOC2

SAFE

HIPPA

ACID

2 / 10

2. Which parameters sets the database default isolation level?

default_transaction_isolation

transaction_isolation_level

default_isolation_level

active_transaction_isolation

3 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

4 / 10

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

False

True

5 / 10

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

False

True

6 / 10

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

Read Committed

Serializable

Read Uncommitted

Repeatable Read

7 / 10

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

False

True

8 / 10

8. The SQL standard specifies three isolation levels?

True

False

9 / 10

9. 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

10 / 10

10. 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 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 and commits the change.

A transaction reads one and the same row once and modifies this row and commits the change.

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. Indexes values also support multi versioning with several versions of an index value existing at any point in time?

False

True

2 / 10

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

INSERT

MERGE

COMMIT

DELETE

3 / 10

3. Rows of TOAST tables are handled in such a way that they are never update?

True

False

4 / 10

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

True

False

5 / 10

5. A page along with its tuples is read into the buffer cache with compression transformations to enhance cache efficiency?

True

False

6 / 10

6. CLOG Pages are never cached in memory?

True

False

7 / 10

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

True

False

8 / 10

8. Tuples can also be referred to as columns?

True

False

9 / 10

9. Which 2 items does a Virtual XID consist of?

xmin

checksum

backend process ID

sequential number

10 / 10

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

xid

xmas

xmin

xmax

Your score is

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