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 server spawns a new backend session for each connection?

False

True

2 / 20

2. What is a schema?

Namespace that store all objects of a database

The name used to refer to a super user account

This is the same as a user in Postgres

A memory area used to cache data from LRU chains

3 / 20

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

True

False

4 / 20

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

False

True

5 / 20

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

False

True

6 / 20

6. TOAST tables reside in a seperate schema?

False

True

7 / 20

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

False

True

8 / 20

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

5GB

5MB

1GB

1MB

9 / 20

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

oid#

oid

obj#

obj

10 / 20

10. How many rows in a page does Postgres aim to have before considering TOAST?

11 / 20

11. Users should not modify the template0 database

True

False

12 / 20

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

True

False

13 / 20

13. 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

14 / 20

14. How many files or forks on disk will a 10Mb table with no index have?

15 / 20

15. Which of below are predefined schemas?

choose 2

system

pg_catalog

public

postgres

16 / 20

16. Which fork is specific for unlogged tables?

visiblilty map

free space map

Main fork

Initialization fork

17 / 20

17. Each Database has its own System Catalog?

False

True

18 / 20

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

False

True

19 / 20

19. What is another name for the postgres process?

aurora

postmaster

postmanager

masterprocess

20 / 20

20. What is the purpose of the template0 database?

Useful for creating development schemas

No such database

Useful for Postgres support Services to debug issues

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

False

True

2 / 10

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

Read Uncommitted

Read Committed

Repeatable Read

Serializable

3 / 10

3. What is the default Isolation Level?

Serializable

Read Uncommitted

Repeatable Read

Read Committed

4 / 10

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

choose 3

Serializable

Repeatable Read

Read Uncommitted

Read Committed

5 / 10

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

Select more than 1 answer below:

Apply explicit locks

Replace procedural code with declarative one.

Use a single SQL operator

Issues a rollback after the commit to satisfy repeatable read.

6 / 10

6. A phantom read anomaly occurs when?

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.

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 also queries this same data.

7 / 10

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

HIPPA

ACID

SAFE

SOC2

8 / 10

8. The SQL standard specifies three isolation levels?

False

True

9 / 10

9. 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, 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.

10 / 10

10. Which of the below are valid Isolations Levels?

choose 2

Serializable

Random Scatter

Read Committed

Rollback Read

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. status of a subtransaction is written into CLOG?

False

True

2 / 10

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

False

True

3 / 10

3. Information about subtransactions is stored under?

PGDATA/pg_min

PGDATA/subtrans

PGDATA/pg_xid

PGDATA/pg_subtrans

4 / 10

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

transaction log

commit log

redo log

archive log

5 / 10

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

pg_current_id()

pg_current_xmin_id()

pg_current_commit_id()

pg_current_xact_id()

6 / 10

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

INSERT

COMMIT

MERGE

DELETE

7 / 10

7. CLOG Pages are never cached in memory?

False

True

8 / 10

8. Tuples can also be referred to as columns?

False

True

9 / 10

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

False

True

10 / 10

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

True

False

Your score is

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