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

True

False

2 / 20

2. Users should not modify the template0 database

True

False

3 / 20

3. System Catalog tables begin with which prefix?

pg_

dba_

cat_

sys_

4 / 20

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

Dan Brown

Sam Altman

Egor Rogov

Paul Sammy

5 / 20

5. What column in system catalogs servers as the Primary Key

obj#

oid#

oid

obj

6 / 20

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

5MB

5GB

1MB

1GB

7 / 20

7. What is another name for the postgres process?

postmanager

postmaster

masterprocess

aurora

8 / 20

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

Directory Path

Access Path

Search Path

Schema Path

9 / 20

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

Main fork

free space map

visiblilty map

table map

10 / 20

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

False

True

11 / 20

11. What is the purpose of the template1 database?

a template for all the other databases

regular database that you can use at your discretion

database used for temporary tables

No such database

12 / 20

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

choose 2

pg_temp

pg_global

pg_tablespace

pg_default

13 / 20

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

choose 3

indexes

triggers

sequences

tables

14 / 20

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

True

False

15 / 20

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

True

False

16 / 20

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

Sysaux Catalog

Sys Catalog

System Catalog

Sysasm Catalog

17 / 20

17. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

stores user tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

18 / 20

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

False

True

19 / 20

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

PGCORE

PGDATA

PGBASE

PGTIPS

20 / 20

20. Which 3 databases exist directly after cluster initialization?

choose 3 options

template1

sysaux

template0

postgres

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

2 / 10

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

choose 3

Repeatable Read

Serializable

Read Uncommitted

Read Committed

3 / 10

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

Serializable

Read Committed

Repeatable Read

Read Uncommitted

4 / 10

4. The SQL standard specifies three isolation levels?

True

False

5 / 10

5. non-repeatable read anomaly occurs when?

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 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 twice, another transaction modifies this row between these reads and commits the change.

6 / 10

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

True

False

7 / 10

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

False

True

8 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

9 / 10

9. Which parameters sets the database default isolation level?

default_transaction_isolation

active_transaction_isolation

transaction_isolation_level

default_isolation_level

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

INSERT

COMMIT

DELETE

CREATE

2 / 10

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

True

False

3 / 10

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

MERGE

DELETE

INSERT

COMMIT

4 / 10

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

True

False

5 / 10

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

True

False

6 / 10

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

xid

xmas

xmax

xmin

7 / 10

7. Tuples can also be referred to as columns?

False

True

8 / 10

8. What does an Item Pointer contain?

choose 3

tuple xid

tuple length

tuple offset from the start of the page

tuple status

9 / 10

9. status of a subtransaction is written into CLOG?

True

False

10 / 10

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

True

False

Your score is

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