Record storage and page layout in DBMS Theory - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the basic unit of data storage in a database.

DBMS Theory

The smallest unit of data storage in a database is called a [1].

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Afield

Bpage

Cblock

Drecord

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing a record with a page, which is a storage unit on disk.

Thinking a field is the smallest unit instead of a record.

A record is the basic unit of data storage representing a single row or tuple in a database table.

2fill in blank

medium

Complete the sentence to explain what a page contains in database storage.

DBMS Theory

A [1] is a fixed-size block of storage that contains multiple records.

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Apage

Brecord

Cfield

Dtuple

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'record' which is smaller than a page.

Confusing 'field' with a page.

A page is a fixed-size block of storage on disk or in memory that holds multiple records for efficient data access.

3fill in blank

hard

Fix the error in the statement about page layout.

DBMS Theory

In a page layout, records are stored [1] to each other to maximize space utilization.

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Arandomly

Bsequentially

Cscattered

Ddispersed

Attempts:

3 left

💡 Hint

Common Mistakes

Assuming records are stored randomly or scattered, which wastes space.

Confusing 'dispersed' with efficient layout.

Records are stored sequentially within a page to maximize space and improve access speed.

4fill in blank

hard

Fill both blanks to describe the two main parts of a page layout.

DBMS Theory

A page layout consists of a [1] area that stores records and a [2] area that stores metadata about the page.

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Adata

Bheader

Cfooter

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing footer or index with the metadata area.

Mixing up data and metadata areas.

The data area stores the actual records, while the header area stores metadata like page ID and free space info.

5fill in blank

hard

Fill all three blanks to complete the dictionary comprehension that maps record IDs to their sizes if size is greater than 100.

DBMS Theory

record_sizes = { [1]: [2] for [3] in records if [4] > 100 }

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Arid

Bsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable for key and value incorrectly.

Placing the condition on the wrong variable.

This comprehension creates a dictionary mapping each record ID (rid) to its size (size) only if the size is greater than 100.