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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept rev="2.12.0" id="idle_session_timeout">
<title>IDLE_SESSION_TIMEOUT Query Option (<keyword keyref="impala212_full"/> or higher only)</title>
<titlealts audience="PDF">
<data name="Category" value="Impala"/>
<data name="Category" value="Impala Query Options"/>
<data name="Category" value="Querying"/>
<data name="Category" value="Developers"/>
<data name="Category" value="Data Analysts"/>
<p rev="2.12.0">
The <codeph>IDLE_SESSION_TIMEOUT</codeph> query option sets the time in seconds after
which an idle session is cancelled. A session is idle when no activity is occurring for
any of the queries in that session, and the session has not started any new queries. Once
a session is expired, you cannot issue any new query requests to it. The session remains
open, but the only operation you can perform is to close it.
<p rev="2.12.0">
The <codeph>IDLE_SESSION_TIMEOUT</codeph> query option overrides the
<codeph>&#8209;&#8209;idle_session_timeout</codeph> startup option. See
<xref href="impala_timeouts.xml#timeouts"/> for the
<codeph>&#8209;&#8209;idle_session_timeout</codeph> startup option.
The <codeph>IDLE_SESSION_TIMEOUT</codeph> query option allows JDBC/ODBC connections to set
the session timeout as a query option with the <codeph>SET</codeph> statement.
<codeblock>SET IDLE_SESSION_TIMEOUT=<varname>seconds</varname>;</codeblock>
<b>Type:</b> numeric
<b>Default:</b> 0
If <codeph>&#8209;&#8209;idle_session_timeout</codeph> is not set, the session never
If <codeph>&#8209;&#8209;idle_session_timeout</codeph> is set, use that timeout value.
<b>Added in:</b> <keyword keyref="impala212_full"/>
<b>Related information:</b>
<xref href="impala_timeouts.xml#timeouts"/>