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| <meta name="DC.Title" content="BATCH_SIZE Query Option" /> |
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| <title>BATCH_SIZE Query Option</title> |
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| <h1 class="title topictitle1" id="ariaid-title1">BATCH_SIZE Query Option</h1> |
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| Number of rows evaluated at a time by SQL operators. Unspecified or a size of 0 uses a predefined default |
| size. Using a large number improves responsiveness, especially for scan operations, at the cost of a higher memory footprint. |
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| This option is primarily for testing during Impala development, or for use under the direction of <span class="keyword">the appropriate support channel</span>. |
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| <strong class="ph b">Type:</strong> numeric |
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| <strong class="ph b">Default:</strong> 0 (meaning the predefined default of 1024) |
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| <strong class="ph b">Range:</strong> 0-65536. The value of 0 still has the special meaning of <span class="q">"use the default"</span>, |
| so the effective range is 1-65536. The maximum applies in <span class="keyword">Impala 2.11</span> and higher. |
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| <div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="../topics/impala_set.html">SET Statement</a></div> |
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