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

False

True

2 / 20

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

True

False

3 / 20

3. What command is used to create the Postgres cluster?

CreateCluster

CreatePGC

StartNewPG

Initialize

4 / 20

4. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

postgres

sysaux

template1

5 / 20

5. What is the purpose of autovacuum?

Performs a backup of WAL logs

Deletes old logs and traces on disk

Rebuilds indexes with b level greater than 2

Removes stale data from tables and indexes

6 / 20

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

Schema Path

Directory Path

Search Path

Access Path

7 / 20

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

True

False

8 / 20

8. Tablespaces are used to define physical data layout?

True

False

9 / 20

9. What is the purpose of the template1 database?

No such database

a template for all the other databases

regular database that you can use at your discretion

database used for temporary tables

10 / 20

10. Postgres uses a thread based process model?

True

False

11 / 20

11. Each Database has its own System Catalog?

False

True

12 / 20

12. Files are logically split into pages?

True

False

13 / 20

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

True

False

14 / 20

14. System Catalog tables begin with which prefix?

dba_

pg_

sys_

cat_

15 / 20

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

False

True

16 / 20

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

1GB

1MB

5GB

5MB

17 / 20

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

True

False

18 / 20

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

True

False

19 / 20

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

BREAD

GROW

TOAST

BAKE

20 / 20

20. 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

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 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.

2 / 10

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

Serializable

Read Committed

Read Uncommitted

Repeatable Read

3 / 10

3. What is the default Isolation Level?

Serializable

Read Committed

Repeatable Read

Read Uncommitted

4 / 10

4. 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;

5 / 10

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

False

True

6 / 10

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

True

False

7 / 10

7. 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 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.

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

8 / 10

8. The SQL standard specifies three isolation levels?

False

True

9 / 10

9. Which parameters sets the database default isolation level?

default_transaction_isolation

transaction_isolation_level

active_transaction_isolation

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. Page free space can often become fragmented?

False

True

2 / 10

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

pg_current_id()

pg_current_xact_id()

pg_current_xmin_id()

pg_current_commit_id()

3 / 10

3. The page header stores checksum and the sizes of the other parts of the page?

True

False

4 / 10

4. Which 2 of the below represent transaction IDs used for row versioning?

xmin

xtime

xid

xmax

5 / 10

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

False

True

6 / 10

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

False

True

7 / 10

7. In Postgres, tables are often referred to as which of the below?

view

heap

clog

dump

8 / 10

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

False

True

9 / 10

9. Tuples can also be referred to as columns?

False

True

10 / 10

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

True

False

Your score is

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