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 purpose of the template0 database?

Useful for creating development schemas

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

No such database

Useful for Postgres support Services to debug issues

2 / 20

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

True

False

3 / 20

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

pg_tablespace

pg_symlinks

pg_tabspace

pg_tblspc

4 / 20

4. Each Database has its own System Catalog?

False

True

5 / 20

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

True

False

6 / 20

6. Which of below are predefined schemas?

choose 2

pg_catalog

system

postgres

public

7 / 20

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

True

False

8 / 20

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

False

True

9 / 20

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

True

False

10 / 20

10. What is another name for the postgres process?

postmanager

masterprocess

postmaster

aurora

11 / 20

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

False

True

12 / 20

12. TOAST tables reside in a seperate schema?

True

False

13 / 20

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

Sysaux Catalog

Sys Catalog

System Catalog

Sysasm Catalog

14 / 20

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

pg_system

pg_tables

pg_catalog

pg_class

15 / 20

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

True

False

16 / 20

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

Access Path

Search Path

Directory Path

Schema Path

17 / 20

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

choose 3

sequences

triggers

tables

indexes

18 / 20

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

False

True

19 / 20

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

False

True

20 / 20

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

Choose 2 option

Instance

Quorum

Postgres Server

Aurora

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. 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 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

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

2 / 10

2. The SQL standard specifies three isolation levels?

False

True

3 / 10

3. 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 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.

4 / 10

4. What is the default Isolation Level?

Repeatable Read

Read Uncommitted

Read Committed

Serializable

5 / 10

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

True

False

6 / 10

6. Which of the below are valid Isolations Levels?

choose 2

Serializable

Read Committed

Rollback Read

Random Scatter

7 / 10

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

False

True

8 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

9 / 10

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

HIPPA

SAFE

SOC2

ACID

10 / 10

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

False

True

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. CLOG files are stored in which directory?

PGDATA/pg_clog

PGDATA/clog

PGDATA/pg_xact

PGDATA/pg_commit

2 / 10

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

False

True

3 / 10

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

pageheadinfo

pageinspect

pagesize

pagedetect

4 / 10

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

archive log

commit log

redo log

transaction log

5 / 10

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

sequential number

checksum

backend process ID

xmin

6 / 10

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

False

True

7 / 10

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

False

True

8 / 10

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

pg_current_xact_id()

pg_current_id()

pg_current_commit_id()

pg_current_xmin_id()

9 / 10

9. When a row is created, its xmin value is set to the transaction ID of which command?

INSERT

CREATE

COMMIT

DELETE

10 / 10

10. CLOG Pages are never cached in memory?

True

False

Your score is

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