Grokking the System Design Interview, Volume II
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Gmail: Database Design

Step 6: Database Design

In this section, we explore how data is structured and managed within the system and design details of core components. We also discuss trade-offs in choosing certain technologies or approaches.

Email Storage Model

To handle billions of emails, we will separate our storage into a Metadata Store, a Document Store, and an Object Store:

We have two types of data to be stored: 1) Structured: This is small, structured info about users and emails (like sender, date sent, etc

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