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| <meta name="DC.Title" content="QUERY_TIMEOUT_S Query Option (Impala 2.0 or higher only)" /> |
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| <title>QUERY_TIMEOUT_S Query Option (Impala 2.0 or higher only)</title> |
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| <h1 class="title topictitle1" id="ariaid-title1">QUERY_TIMEOUT_S Query Option (<span class="keyword">Impala 2.0</span> or higher only)</h1> |
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| <div class="body conbody"> |
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| <p class="p"> |
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| Sets the idle query timeout value for the session, in seconds. Queries that sit idle for longer than the |
| timeout value are automatically cancelled. If the system administrator specified the |
| <code class="ph codeph">--idle_query_timeout</code> startup option, <code class="ph codeph">QUERY_TIMEOUT_S</code> must be smaller than |
| or equal to the <code class="ph codeph">--idle_query_timeout</code> value. |
| </p> |
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| <div class="note note"><span class="notetitle">Note:</span> |
| <p class="p"> |
| The timeout clock for queries and sessions only starts ticking when the query or |
| session is idle. |
| </p> |
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| <p class="p"> |
| For queries, this means the query has results ready but is waiting for a client to |
| fetch the data. A query can run for an arbitrary time without triggering a timeout, |
| because the query is computing results rather than sitting idle waiting for the |
| results to be fetched. The timeout period is intended to prevent unclosed queries from |
| consuming resources and taking up slots in the admission count of running queries, |
| potentially preventing other queries from starting. |
| </p> |
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| <p class="p"> |
| For sessions, this means that no query has been submitted for some period of time. |
| </p> |
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| </div> |
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| <p class="p"> |
| <strong class="ph b">Syntax:</strong> |
| </p> |
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| <pre class="pre codeblock"><code>SET QUERY_TIMEOUT_S=<var class="keyword varname">seconds</var>;</code></pre> |
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| <p class="p"> |
| <strong class="ph b">Type:</strong> numeric |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Default:</strong> 0 (no timeout if <code class="ph codeph">--idle_query_timeout</code> not in effect; otherwise, use |
| <code class="ph codeph">--idle_query_timeout</code> value) |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Added in:</strong> <span class="keyword">Impala 2.0.0</span> |
| </p> |
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| <p class="p"> |
| <strong class="ph b">Related information:</strong> |
| </p> |
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| <p class="p"> |
| <a class="xref" href="impala_timeouts.html#timeouts">Setting Timeout Periods for Daemons, Queries, and Sessions</a> |
| </p> |
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| </div> |
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| <div class="related-links"> |
| <div class="familylinks"> |
| <div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="../topics/impala_query_options.html">Query Options for the SET Statement</a></div> |
| </div> |
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