<h1 id="scalability">Scalability<a aria-hidden="true" class="anchor-heading icon-link" href="#scalability"></a></h1>
<h1 id="scalability-1">Scalability<a aria-hidden="true" class="anchor-heading icon-link" href="#scalability-1"></a></h1>
<p>describe a system’s ability to cope with increased load.</p>
<h2 id="load">Load<a aria-hidden="true" class="anchor-heading icon-link" href="#load"></a></h2>
<p>Load can be described with a few numbers which we call load parameters</p>
<p>The best choice of parameters depends on the architecture of your system</p>
<h2 id="performance">Performance<a aria-hidden="true" class="anchor-heading icon-link" href="#performance"></a></h2>
<ul>
<li>
<p>When you increase a load parameter and keep the system resources (CPU, memory, network bandwidth, etc.) unchanged, how is the performance of your system affected?</p>
</li>
<li>
<p>When you increase a load parameter, how much do you need to increase the resources if you want to keep performance unchanged?</p>
</li>
<li>
<p>throughput (the number of records we can process per second)</p>
</li>
<li>
<p>response time (the time between a client sending a request and receiving a response.)</p>
</li>
</ul>
<h2 id="scale">scale<a aria-hidden="true" class="anchor-heading icon-link" href="#scale"></a></h2>
<ul>
<li>scaling up (<strong>vertical scaling</strong>, moving to a more powerful machine) </li>
<li>scaling out (<strong>horizontal scaling</strong>, distributing the load across multiple smaller machines).</li>
</ul>