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

True

False

2 / 20

2. What is a schema?

A memory area used to cache data from LRU chains

This is the same as a user in Postgres

Namespace that store all objects of a database

The name used to refer to a super user account

3 / 20

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

pg_tabspace

pg_tablespace

pg_tblspc

pg_symlinks

4 / 20

4. What is the purpose of the template0 database?

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

No such database

Useful for creating development schemas

Useful for Postgres support Services to debug issues

5 / 20

5. Which 3 databases exist directly after cluster initialization?

choose 3 options

postgres

sysaux

template1

template0

6 / 20

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

False

True

7 / 20

7. What is another name for the postgres process?

masterprocess

postmaster

postmanager

aurora

8 / 20

8. System Catalog tables begin with which prefix?

pg_

sys_

cat_

dba_

9 / 20

9. What is the purpose of wal writer?

flushes dirty pages to disk.

executes checkpoints

collects usage statistics for the instance.

writes WAL entries to disk

10 / 20

10. It is the postmasters job to listener for incoming connections?

False

True

11 / 20

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

True

False

12 / 20

12. What is the purpose of the postgres database?

regular database that you can use at your discretion

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

a template for all the other database

No such database

13 / 20

13. What is the point of the pg_global tablespace?

stores system catalog objects 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 temporary tables that are common to the whole cluster

14 / 20

14. TOAST tables reside in a seperate schema?

False

True

15 / 20

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

False

True

16 / 20

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

obj#

oid

obj

oid#

17 / 20

17. Tablespaces are used to define physical data layout?

True

False

18 / 20

18. What is the purpose of the template1 database?

a template for all the other databases

database used for temporary tables

No such database

regular database that you can use at your discretion

19 / 20

19. What is the purpose of the public schema?

default schema for user objects

no such schema

restricted schema for postgres internal usage only

schema used for heterogeneous replication

20 / 20

20. A single Postgres Instance can server only 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. What is the acronym used for the attributes that ensure Data consistency, integrity and durability?

HIPPA

ACID

SOC2

SAFE

2 / 10

2. 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.

3 / 10

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

True

False

4 / 10

4. A phantom read anomaly occurs when?

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.

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

5 / 10

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

choose 3

Serializable

Repeatable Read

Read Committed

Read Uncommitted

6 / 10

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

True

False

7 / 10

7. 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

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

Apply explicit locks

8 / 10

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

False

True

9 / 10

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

Serializable

Read Committed

Repeatable Read

Read Uncommitted

10 / 10

10. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Serializable

Random Scatter

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/clog

PGDATA/pg_xact

PGDATA/pg_clog

PGDATA/pg_commit

2 / 10

2. Which of the below are true about a Pages Item Pointer?

Also know as the pages table of contents

Each pointer uses 8 bytes

Each pointer uses 4 bytes

stored in PGDATA/itemptr directory

3 / 10

3. Information about subtransactions is stored under?

PGDATA/pg_min

PGDATA/pg_subtrans

PGDATA/pg_xid

PGDATA/subtrans

4 / 10

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

xmas

xmax

xid

xmin

5 / 10

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

True

False

6 / 10

6. Each page has a layer that usually consists of?

choose 2

undo segment

free space

page header

flashback block

7 / 10

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

False

True

8 / 10

8. Tuples can also be referred to as columns?

False

True

9 / 10

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

True

False

10 / 10

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

True

False

Your score is

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