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SELECT
	SUM(base.size) AS `Size in MB`
FROM(
	SELECT 
	     ROUND(((data_length + index_length) / 1024 / 1024), 2) AS size 
	FROM information_schema.TABLES 
) AS base

<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1">1</a> <a href="#L-2">2</a> <a href="#L-3">3</a> <a href="#L-4">4</a> <a href="#L-5">5</a> <a href="#L-6">6</a> <a href="#L-7">7</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a>SELECT </span><span id="L-2"><a name="L-2"></a> SUM(base.size) AS `Size in MB` </span><span id="L-3"><a name="L-3"></a>FROM( </span><span id="L-4"><a name="L-4"></a> SELECT </span><span id="L-5"><a name="L-5"></a> ROUND(((data_length + index_length) / 1024 / 1024), 2) AS size </span><span id="L-6"><a name="L-6"></a> FROM information_schema.TABLES </span><span id="L-7"><a name="L-7"></a>) AS base </span></pre></div> </td></tr></table>