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. Postgres uses a thread based process model?

False

True

2 / 20

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

choose 2

pg_default

pg_tablespace

pg_global

pg_temp

3 / 20

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

False

True

4 / 20

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

used space map

vacuum space map

free space map

wal space map

5 / 20

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

False

True

6 / 20

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

GROW

BAKE

TOAST

BREAD

7 / 20

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

False

True

8 / 20

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

False

True

9 / 20

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

True

False

10 / 20

10. What is the purpose of autovacuum?

Rebuilds indexes with b level greater than 2

Removes stale data from tables and indexes

Performs a backup of WAL logs

Deletes old logs and traces on disk

11 / 20

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

True

False

12 / 20

12. TOAST tables reside in a seperate schema?

True

False

13 / 20

13. What is the purpose of the visibility map?

provides an audit trail for the database

shows a page to be vacuumed or frozen

shows referential relationships for tables

provides the data decryption key

14 / 20

14. Which of below are predefined schemas?

choose 3

pg_toast

pg_temp

information_schema

pg_schema

15 / 20

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

pg_tables

pg_catalog

pg_system

pg_class

16 / 20

16. System Catalog tables begin with which prefix?

dba_

sys_

cat_

pg_

17 / 20

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

True

False

18 / 20

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

rollback segments (RBS)

undo segments (UNDO)

online redo logs (ORL)

write-ahead log (WAL)

19 / 20

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

False

True

20 / 20

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

True

False

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. The SQL standard specifies three isolation levels?

True

False

2 / 10

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

False

True

3 / 10

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

Select more than 1 answer below:

Use a single SQL operator

Replace procedural code with declarative one.

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

4 / 10

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

SAFE

SOC2

HIPPA

ACID

5 / 10

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

True

False

6 / 10

6. 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 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 adds some other rows satisfying this condition and commits.

7 / 10

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

False

True

8 / 10

8. Which parameters sets the database default isolation level?

default_transaction_isolation

active_transaction_isolation

default_isolation_level

transaction_isolation_level

9 / 10

9. What is the default Isolation Level?

Serializable

Repeatable Read

Read Committed

Read Uncommitted

10 / 10

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

Repeatable Read

Read Uncommitted

Read Committed

Serializable

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

True

False

2 / 10

2. Tuples can also be referred to as columns?

False

True

3 / 10

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

True

False

4 / 10

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

COMMIT

DELETE

INSERT

CREATE

5 / 10

5. If a transaction aborts, all page changes are reverted(rolled back) in place?

True

False

6 / 10

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

False

True

7 / 10

7. Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/pg_xid

PGDATA/subtrans

PGDATA/pg_min

8 / 10

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

True

False

9 / 10

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

False

True

10 / 10

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

transaction log

commit log

redo log

archive log

Your score is

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