VACUUM and its importance in PostgreSQL - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run a basic VACUUM command on the table named 'users'.

PostgreSQL

VACUUM [1];

Drag options to blanks, or click blank then click option'

ASELECT

BTABLE

Cusers

DDATABASE

Attempts:

3 left

💡 Hint

Common Mistakes

Using keywords like SELECT or TABLE instead of the actual table name.

Trying to vacuum the whole database without specifying it properly.

The VACUUM command followed by the table name 'users' cleans up that specific table.

2fill in blank

medium

Complete the code to perform a VACUUM FULL on the 'orders' table to reclaim disk space.

PostgreSQL

VACUUM FULL [1];

Drag options to blanks, or click blank then click option'

Aorders

BDATABASE

CINDEX

DANALYZE

Attempts:

3 left

💡 Hint

Common Mistakes

Using DATABASE, ANALYZE, or INDEX instead of the table name.

Inserting unnecessary keywords like TABLE.

VACUUM FULL followed by the table name reclaims all available disk space by compacting the table into a minimal contiguous area.

3fill in blank

hard

Fix the error in the VACUUM command to analyze the 'products' table after vacuuming.

PostgreSQL

VACUUM ANALYZE [1];

Drag options to blanks, or click blank then click option'

Aproducts

BDATABASE

CINDEX

DFULL

Attempts:

3 left

💡 Hint

Common Mistakes

Using INDEX, DATABASE, or FULL instead of the table name.

Adding extra keywords like TABLE.

The correct syntax is VACUUM ANALYZE followed by the table name to vacuum and update statistics.

4fill in blank

hard

Fill the blank to create a command that vacuums and analyzes the 'customers' table.

PostgreSQL

VACUUM [1] customers;

Drag options to blanks, or click blank then click option'

ADATABASE

BANALYZE

CFULL

DTABLE

Attempts:

3 left

💡 Hint

Common Mistakes

Using TABLE, FULL, or DATABASE instead of ANALYZE.

Adding extra unnecessary keywords.

VACUUM ANALYZE table_name vacuums the table and updates query planner statistics.

5fill in blank

hard

Fill both blanks to vacuum full and analyze the 'invoices' table.

PostgreSQL

VACUUM [1] [2] invoices;

Drag options to blanks, or click blank then click option'

ATABLE

BFULL

CANALYZE

DDATABASE

Attempts:

3 left

💡 Hint

Common Mistakes

Using TABLE or DATABASE instead of FULL/ANALYZE.

Mixing up the order of FULL and ANALYZE.

The correct command is VACUUM FULL ANALYZE table_name to fully reclaim space and update statistics.