# Estimating disk storage for user data

To properly estimate the amount of disk storage that is necessary to store your data, you need to consider several factors.

## About this task

Estimating the space requirements for Db2 objects is easier if you collect and maintain a statistical history of those objects. The accuracy of your estimates depends on the currentness of the statistical data.

## Procedure

To estimate disk storage for user data:

Ensure that the statistics history is current by using
the MODIFY STATISTICS utility to delete outdated statistical data
from the catalog history tables.