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<!DOCTYPE html>
<html lang="en" data-theme="dark">
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<title>System Design Primer — Documentation</title>
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<span class="logo-text">System Design<br><small>Primer</small></span>
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<span class="nav-group-label">Part A: Getting Started</span>
<span class="nav-group-badge">4</span>
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<a href="#" class="nav-item active" data-chapter="motivation">
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<span class="nav-item-number">01</span>
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<span class="nav-item-number">02</span>
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<span class="nav-item-number">03</span>
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<span class="nav-item-number">04</span>
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<span class="nav-group-label">Part B: Core Concepts</span>
<span class="nav-group-badge">5</span>
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<span class="nav-item-number">05</span>
<span class="nav-item-label">Performance vs Scalability</span>
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<a href="#" class="nav-item" data-chapter="latency-throughput">
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<span class="nav-item-number">06</span>
<span class="nav-item-label">Latency vs Throughput</span>
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<a href="#" class="nav-item" data-chapter="availability-consistency">
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<span class="nav-item-number">07</span>
<span class="nav-item-label">Availability vs Consistency</span>
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<span class="nav-item-number">08</span>
<span class="nav-item-label">Consistency Patterns</span>
</a>
<a href="#" class="nav-item" data-chapter="availability-patterns">
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<span class="nav-item-number">09</span>
<span class="nav-item-label">Availability Patterns</span>
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<span class="nav-group-label">Part C: Infrastructure</span>
<span class="nav-group-badge">4</span>
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<a href="#" class="nav-item" data-chapter="dns">
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<span class="nav-item-number">10</span>
<span class="nav-item-label">Domain Name System</span>
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<span class="nav-item-number">11</span>
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<span class="nav-item-number">12</span>
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<span class="nav-item-number">13</span>
<span class="nav-item-label">Reverse Proxy</span>
</a>
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<!-- Part D -->
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<span class="nav-group-label">Part D: Data Layer</span>
<span class="nav-group-badge">4</span>
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<a href="#" class="nav-item" data-chapter="application-layer">
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<span class="nav-item-number">14</span>
<span class="nav-item-label">Application Layer</span>
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<a href="#" class="nav-item" data-chapter="database">
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<span class="nav-item-number">15</span>
<span class="nav-item-label">Database</span>
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<a href="#" class="nav-item" data-chapter="cache">
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<span class="nav-item-number">16</span>
<span class="nav-item-label">Cache</span>
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<a href="#" class="nav-item" data-chapter="asynchronism">
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<span class="nav-item-number">17</span>
<span class="nav-item-label">Asynchronism</span>
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<span class="nav-group-label">Part E: Communication</span>
<span class="nav-group-badge">2</span>
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<a href="#" class="nav-item" data-chapter="communication">
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<span class="nav-item-number">18</span>
<span class="nav-item-label">Communication</span>
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<a href="#" class="nav-item" data-chapter="security">
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<span class="nav-item-number">19</span>
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<span class="nav-group-label">Part F: Practice Problems</span>
<span class="nav-group-badge">8</span>
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<a href="#" class="nav-item" data-chapter="design-pastebin">
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<span class="nav-item-number">20</span>
<span class="nav-item-label">Design Pastebin</span>
</a>
<a href="#" class="nav-item" data-chapter="design-twitter">
<span class="nav-item-status" data-check="design-twitter"></span>
<span class="nav-item-number">21</span>
<span class="nav-item-label">Design Twitter</span>
</a>
<a href="#" class="nav-item" data-chapter="design-web-crawler">
<span class="nav-item-status" data-check="design-web-crawler"></span>
<span class="nav-item-number">22</span>
<span class="nav-item-label">Design Web Crawler</span>
</a>
<a href="#" class="nav-item" data-chapter="design-mint">
<span class="nav-item-status" data-check="design-mint"></span>
<span class="nav-item-number">23</span>
<span class="nav-item-label">Design Mint.com</span>
</a>
<a href="#" class="nav-item" data-chapter="design-social-graph">
<span class="nav-item-status" data-check="design-social-graph"></span>
<span class="nav-item-number">24</span>
<span class="nav-item-label">Design Social Network</span>
</a>
<a href="#" class="nav-item" data-chapter="design-kv-store">
<span class="nav-item-status" data-check="design-kv-store"></span>
<span class="nav-item-number">25</span>
<span class="nav-item-label">Design Key-Value Cache</span>
</a>
<a href="#" class="nav-item" data-chapter="design-sales-rank">
<span class="nav-item-status" data-check="design-sales-rank"></span>
<span class="nav-item-number">26</span>
<span class="nav-item-label">Design Sales Ranking</span>
</a>
<a href="#" class="nav-item" data-chapter="design-scaling-aws">
<span class="nav-item-status" data-check="design-scaling-aws"></span>
<span class="nav-item-number">27</span>
<span class="nav-item-label">Scaling on AWS</span>
</a>
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<!-- Part G -->
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<span class="nav-group-label">Part G: OO Design</span>
<span class="nav-group-badge">6</span>
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<a href="#" class="nav-item" data-chapter="oo-hash-map">
<span class="nav-item-status" data-check="oo-hash-map"></span>
<span class="nav-item-number">28</span>
<span class="nav-item-label">Design Hash Map</span>
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<a href="#" class="nav-item" data-chapter="oo-lru-cache">
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<span class="nav-item-number">29</span>
<span class="nav-item-label">Design LRU Cache</span>
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<span class="nav-item-number">30</span>
<span class="nav-item-label">Design Call Center</span>
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<span class="nav-item-number">31</span>
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<span class="nav-item-number">32</span>
<span class="nav-item-label">Design Parking Lot</span>
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<span class="nav-item-status" data-check="oo-online-chat"></span>
<span class="nav-item-number">33</span>
<span class="nav-item-label">Design Online Chat</span>
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<span class="nav-group-badge">5</span>
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<span class="nav-item-number">34</span>
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<a href="#" class="nav-item" data-chapter="latency-numbers">
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<span class="nav-item-number">35</span>
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<a href="#" class="nav-item" data-chapter="additional-questions">
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<span class="nav-item-number">36</span>
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<a href="#" class="nav-item" data-chapter="real-world-architectures">
<span class="nav-item-status" data-check="real-world-architectures"></span>
<span class="nav-item-number">37</span>
<span class="nav-item-label">Real World Architectures</span>
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<a href="#" class="nav-item" data-chapter="engineering-blogs">
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<span class="nav-item-number">38</span>
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