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luhuayi 177cd61a57 DWS DEVG 910.211 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: luhuayi <luhuayi@huawei.com>
Co-committed-by: luhuayi <luhuayi@huawei.com>
2025-05-05 07:44:03 +00:00

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<a name="EN-US_TOPIC_0000001764491904"></a><a name="EN-US_TOPIC_0000001764491904"></a>
<h1 class="topictitle1">Communication Library Parameters</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001764491904__en-us_topic_0059778583_p54955141810">This section describes parameter settings and value ranges for communication libraries.</p>
<div class="section" id="EN-US_TOPIC_0000001764491904__s0e7f5ef30e6b4436bd8ff4eecc2b0874"><h4 class="sectiontitle">tcp_keepalives_idle</h4><p id="EN-US_TOPIC_0000001764491904__a26797864f5774ee2b34b8ff262b4d8e2"><strong id="EN-US_TOPIC_0000001764491904__en-us_topic_0059778583_a60c2f17c939047c08795c5ce96cf167e">Parameter description</strong>: Specifies the interval between keepalive signal sending in an OS that supports the <strong id="EN-US_TOPIC_0000001764491904__b842352706203218">TCP_KEEPIDLE</strong> socket parameter. If no keepalive signal is transmitted, the connection is in idle state.</p>
<p id="EN-US_TOPIC_0000001764491904__p1452911296378"><strong id="EN-US_TOPIC_0000001764491904__b189511377458">Type</strong>: USERSET</p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__n4a1b7efd51fb42d697279828521f6da4"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><ul id="EN-US_TOPIC_0000001764491904__u30a04cb0764b4f1cbe0f254ef29104d6"><li id="EN-US_TOPIC_0000001764491904__le71082b8085b4ee29db41a6be5b06304">If the OS does not support the <strong id="EN-US_TOPIC_0000001764491904__b842352706203234">TCP_KEEPIDLE</strong> parameter, set this parameter to <strong id="EN-US_TOPIC_0000001764491904__b20828749124512">0</strong>.</li><li id="EN-US_TOPIC_0000001764491904__le6b8dd9ee791420393e0bb189098c788">The parameter is ignored on the OS where connections are established using the Unix domain socket.</li></ul>
</div></div>
<p id="EN-US_TOPIC_0000001764491904__a8550e912907445589735dde4df6fd95d"><strong id="EN-US_TOPIC_0000001764491904__en-us_topic_0059778583_ae1fba327c9ca4d8fbdc7c3edcb5ec65f">Value range</strong>: an integer ranging from 0 to 3600. The unit is second (s).</p>
<p id="EN-US_TOPIC_0000001764491904__a021f2a2339ea44cda4be13e4a72bc2a3"><strong id="EN-US_TOPIC_0000001764491904__b13915259151516">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b842352706165429">0</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__s88ee62d5b677499e9268041185289d5f"><h4 class="sectiontitle">tcp_keepalives_interval</h4><p id="EN-US_TOPIC_0000001764491904__acec45ab85e1e4d658ed8cbe3d5fef5e6"><strong id="EN-US_TOPIC_0000001764491904__en-us_topic_0059778583_aed939b35e7b64a5590f7fa90d5ba7828">Parameter description:</strong> Specifies the response time before retransmission when the OS supports the <strong id="EN-US_TOPIC_0000001764491904__b842352706203243">TCP_KEEPINTVL</strong> socket parameter.</p>
<p id="EN-US_TOPIC_0000001764491904__p191029379"><strong id="EN-US_TOPIC_0000001764491904__b135119388459">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__a2eb559ab1d8c4e0c8870f3fe17932ec5"><strong id="EN-US_TOPIC_0000001764491904__b1109420104817">Value range</strong>: an integer ranging from 0 to 180. The unit is second (s).</p>
<p id="EN-US_TOPIC_0000001764491904__a07b27c9bf3d14ba0a809e6da6242ba35"><strong id="EN-US_TOPIC_0000001764491904__b586329438">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b166350413">0</strong></p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__n0e451a4b304841a3954e18f73712a6a9"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><ul id="EN-US_TOPIC_0000001764491904__u8d4ea242e3db4b74809bca33fb4ce71f"><li id="EN-US_TOPIC_0000001764491904__l2c38ac84d6b04e97b4e78fcdbc173727">If the OS does not support the <strong id="EN-US_TOPIC_0000001764491904__b842352706203251">TCP_KEEPINTVL</strong> parameter, set this parameter to <strong id="EN-US_TOPIC_0000001764491904__b151015371423">0</strong>.</li><li id="EN-US_TOPIC_0000001764491904__ld9ca38ec6dfe4115bd07179e031e9b67">The parameter is ignored on the OS where connections are established using the Unix domain socket.</li></ul>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__s3d4ec3e1bb7b4a1ab9eeb35ba8a293d4"><h4 class="sectiontitle">tcp_keepalives_count</h4><p id="EN-US_TOPIC_0000001764491904__ab28b2392e36f4a9b842bc9ef302b7fb9"><strong id="EN-US_TOPIC_0000001764491904__en-us_topic_0085032266_b716134618616">Parameter description</strong>: Specifies the number of keepalived signals that can be waited before the <span id="EN-US_TOPIC_0000001764491904__text1488884754">GaussDB(DWS)</span> server is disconnected from the client if the OS supports the <strong id="EN-US_TOPIC_0000001764491904__en-us_topic_0085032266_b842352706203257">TCP_KEEPCNT</strong> socket parameter.</p>
<p id="EN-US_TOPIC_0000001764491904__p127107914377"><strong id="EN-US_TOPIC_0000001764491904__b272313380451">Type</strong>: USERSET</p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__n3ea0fd0af7c74aca9d4922ba568a66b0"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><ul id="EN-US_TOPIC_0000001764491904__ub96bcca4d68146328088e167570146f8"><li id="EN-US_TOPIC_0000001764491904__l3f55546ee61b470bb7ee9d3e7d4e7287">If the OS does not support the <strong id="EN-US_TOPIC_0000001764491904__b84235270620334">TCP_KEEPCNT</strong> parameter, set this parameter to <strong id="EN-US_TOPIC_0000001764491904__b65501211315">0</strong>.</li><li id="EN-US_TOPIC_0000001764491904__la70f542ac82a4d74bbbf3305d868bde2">The parameter is ignored on the OS where connections are established using the Unix domain socket.</li></ul>
</div></div>
<p id="EN-US_TOPIC_0000001764491904__a2795dcf6a7a54a14b3592cb15625fe85"><strong id="EN-US_TOPIC_0000001764491904__b128153115715">Value range</strong>: an integer ranging from 0 to 100. <strong id="EN-US_TOPIC_0000001764491904__b1982011371">0</strong> indicates that the connection is immediately broken if <span id="EN-US_TOPIC_0000001764491904__text715441455">GaussDB(DWS)</span> does not receive a keepalived signal from the client.</p>
<p id="EN-US_TOPIC_0000001764491904__a728f43c74a86408789b71eeeb1592abd"><strong id="EN-US_TOPIC_0000001764491904__b103241288719">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b19324181678">0</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__s0011acc521b848fe85b25a68f534dc73"><a name="EN-US_TOPIC_0000001764491904__s0011acc521b848fe85b25a68f534dc73"></a><a name="s0011acc521b848fe85b25a68f534dc73"></a><h4 class="sectiontitle">comm_max_datanode</h4><p id="EN-US_TOPIC_0000001764491904__aaa6dd1c9c3d8452b8edd21d8d803e21e"><strong id="EN-US_TOPIC_0000001764491904__b1612595103818">Parameter description</strong>: Specifies the maximum number of DNs supported by the communication library.</p>
<p id="EN-US_TOPIC_0000001764491904__p128352383717"><strong id="EN-US_TOPIC_0000001764491904__b1587874604">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__a8b81a0eaedf04156b377e670b33f1e6d"><strong id="EN-US_TOPIC_0000001764491904__b1755519300498">Value range</strong>: an integer ranging from 1 to 8192</p>
<p id="EN-US_TOPIC_0000001764491904__a48448b884a784234b18b4bb0f23db73e"><strong id="EN-US_TOPIC_0000001764491904__b49081319145711">Default value</strong>: actual number of DNs</p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__note959519271220"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001764491904__p259517276227">Increasing this parameter value takes effect immediately, while decreasing the value takes effect after the cluster is restarted.</p>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__s9ef3426b35d140bb934db112acc751f2"><h4 class="sectiontitle">comm_max_stream</h4><p id="EN-US_TOPIC_0000001764491904__a5ad0de68b57d4501a63e559a75f1e58b"><strong id="EN-US_TOPIC_0000001764491904__b1973111532519">Parameter description</strong>: maximum number of logical connection data structures cached in the communication library.</p>
<p id="EN-US_TOPIC_0000001764491904__p15342512133615"><strong id="EN-US_TOPIC_0000001764491904__b10541175202514">Type</strong>: SIGHUP</p>
<p id="EN-US_TOPIC_0000001764491904__a90a9143d554441ce8d8e372938b11cf5"><strong id="EN-US_TOPIC_0000001764491904__b13362202192616">Value range</strong>: an integer ranging from 1 to 65535</p>
<p id="EN-US_TOPIC_0000001764491904__a4d3e94d57fc54323af104ca7b77c0f50"><strong id="EN-US_TOPIC_0000001764491904__b1592999814101810">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b1392946365101810">1024</strong></p>
<div class="note" id="EN-US_TOPIC_0000001764491904__note9292114813213"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0000001764491904__p71089465274">If the value of <a href="#EN-US_TOPIC_0000001764491904__s0011acc521b848fe85b25a68f534dc73">comm_max_datanode</a> is small, the process memory is sufficient. In this case, you can increase the value of <strong id="EN-US_TOPIC_0000001764491904__b8536836102718">comm_max_stream</strong>.</p>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__section16782547103210"><h4 class="sectiontitle">max_stream_pool</h4><p id="EN-US_TOPIC_0000001764491904__p478244703217"><strong id="EN-US_TOPIC_0000001764491904__b443001915411">Parameter description</strong>: Specifies the maximum number of stream threads that can be contained in a stream thread pool. This feature is supported in 8.1.2 or later.</p>
<p id="EN-US_TOPIC_0000001764491904__p1078212479322"><strong id="EN-US_TOPIC_0000001764491904__b349084420270">Type</strong>: SUSET</p>
<p id="EN-US_TOPIC_0000001764491904__p3782104718323"><strong id="EN-US_TOPIC_0000001764491904__b8008013441744">Value range</strong>: an integer ranging from –1 to INT_MAX. The values <strong id="EN-US_TOPIC_0000001764491904__b42985461141744">–1</strong> and<strong id="EN-US_TOPIC_0000001764491904__b146992526341744"> 0</strong> indicate that the stream thread pool is disabled.</p>
<p id="EN-US_TOPIC_0000001764491904__p1478244714324"><strong id="EN-US_TOPIC_0000001764491904__b10231151891010">Default value</strong>:</p>
<ul id="EN-US_TOPIC_0000001764491904__ul1917120481279"><li id="EN-US_TOPIC_0000001764491904__li1817174832719">The formula for a new cluster is <strong id="EN-US_TOPIC_0000001764491904__b4930172691018">max_stream_pool=MIN(max_connections, max_process_memory/16/5MB, 1024)</strong>.</li><li id="EN-US_TOPIC_0000001764491904__li6171184832718">The formula for a cluster upgraded from versions earlier than is <strong id="EN-US_TOPIC_0000001764491904__b632832523917">max_stream_pool = MIN(max_connections, max_process_memory/16/5MB, 1024, value of the old cluster)</strong>. During the upgrade, the settings for the new cluster are forcibly used. The old value is used if it is smaller.</li></ul>
<div class="note" id="EN-US_TOPIC_0000001764491904__note1278284733213"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001764491904__ul17823473324"><li id="EN-US_TOPIC_0000001764491904__li4782184773212">The number of stream threads in a thread pool can be reduced in real time. If the value of this parameter is increased, the number of stream threads is increased to meet the service requirements.</li><li id="EN-US_TOPIC_0000001764491904__li478234753219">Generally, you are advised not to change the value of this parameter because the stream thread pool supports the automatic cleanup function.</li><li id="EN-US_TOPIC_0000001764491904__li29035251717">If too many idle stream threads occupy the memory, you can decrease the value of this parameter to save the memory.</li></ul>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__section1254316303485"><h4 class="sectiontitle">enable_stream_sync_quit</h4><p id="EN-US_TOPIC_0000001764491904__p181325524489"><strong id="EN-US_TOPIC_0000001764491904__b139671250172715">Parameter description</strong>: whether the stream threads exit synchronously when the stream plan ends. This parameter is supported only by clusters of version 8.3.0 or later.</p>
<p id="EN-US_TOPIC_0000001764491904__p1813317521483"><strong id="EN-US_TOPIC_0000001764491904__b482566801">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__p11135724195118"><strong id="EN-US_TOPIC_0000001764491904__b1213515242518">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001764491904__ul19135142417518"><li id="EN-US_TOPIC_0000001764491904__li81353243519"><strong id="EN-US_TOPIC_0000001764491904__b618253652818">on</strong> indicates that threads in the stream thread group exit after the stream plan ends.</li><li id="EN-US_TOPIC_0000001764491904__li928510218547"><strong id="EN-US_TOPIC_0000001764491904__b102931227297">off</strong> indicates that stream threads exit directly after the stream plan ends without waiting for the threads in the stream thread group to exit.</li></ul>
<p id="EN-US_TOPIC_0000001764491904__p11875181615418"><strong id="EN-US_TOPIC_0000001764491904__b1932085025103727">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b2132507122103727">off</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__section15387165451117"><h4 class="sectiontitle">enable_connect_standby</h4><p id="EN-US_TOPIC_0000001764491904__p13387115471115"><strong id="EN-US_TOPIC_0000001764491904__b611785774911">Parameter description</strong>: Sets the connection between a CN and a standby DN. This parameter is supported only by clusters of version 8.3.0 or later.</p>
<p id="EN-US_TOPIC_0000001764491904__p11387135471112"><strong id="EN-US_TOPIC_0000001764491904__b741985567">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__p1387754151116"><strong id="EN-US_TOPIC_0000001764491904__b1238720542118">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001764491904__ul93871654101114"><li id="EN-US_TOPIC_0000001764491904__li03871354191113"><strong id="EN-US_TOPIC_0000001764491904__b1588081113509">on</strong> indicates that the CN connects to the standby server.</li><li id="EN-US_TOPIC_0000001764491904__li13871454181120"><strong id="EN-US_TOPIC_0000001764491904__b8790824185018">off</strong> indicates that the CN connects to the primary DN.</li></ul>
<p id="EN-US_TOPIC_0000001764491904__p123874549113"><strong id="EN-US_TOPIC_0000001764491904__b855689544">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b126013487">off</strong></p>
<div class="caution" id="EN-US_TOPIC_0000001764491904__note099874510321"><span class="cautiontitle"><img src="public_sys-resources/caution_3.0-en-us.png"> </span><div class="cautionbody"><ul id="EN-US_TOPIC_0000001764491904__ul137905593320"><li id="EN-US_TOPIC_0000001764491904__li1279013503313">You are not advised to use this parameter in routine services. This parameter applies only to O&amp;M operations. You are not advised to use the <strong id="EN-US_TOPIC_0000001764491904__b1806154210501">gs_guc tool</strong> for global settings. Otherwise, problems such as data inconsistency and result set errors may occur.</li><li id="EN-US_TOPIC_0000001764491904__li57903583317">Enabling this parameter for a session with temporary tables will delete the temporary table data on DNs and prevent further actions on those tables.</li></ul>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__s34f28849693d456e8dbf8c8147301012"><h4 class="sectiontitle">comm_quota_size</h4><p id="EN-US_TOPIC_0000001764491904__adfd6547d569040fcac9e7bd8a793a384"><strong id="EN-US_TOPIC_0000001764491904__b15527545123816">Parameter description</strong>: Specifies the maximum size of packets that can be continuously sent by the communication library. When you use a 1GE NIC, a small value ranging from 20 KB to 40 KB is recommended.</p>
<p id="EN-US_TOPIC_0000001764491904__p18740205493511"><strong id="EN-US_TOPIC_0000001764491904__b3637174524517">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__ab2d345b5f8364a629db6aa8e973709dd"><strong id="EN-US_TOPIC_0000001764491904__b8806105145011">Value range</strong>: an integer ranging from 0 to 102400. The default unit is KB. The value <strong id="EN-US_TOPIC_0000001764491904__b88051142123015">0</strong> indicates that the quota mechanism is not used.</p>
<p id="EN-US_TOPIC_0000001764491904__aa2e4fdd7351b4393a8bb992da80d5ac7"><strong id="EN-US_TOPIC_0000001764491904__b18024168155138">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b842352706193057">1 MB</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__sfade85f464b14ac4bbb0b00be030fcbc"><h4 class="sectiontitle">comm_usable_memory</h4><p id="EN-US_TOPIC_0000001764491904__aba077b0b16da47cfb17ab42117db4134"><strong id="EN-US_TOPIC_0000001764491904__b186081716132410">Parameter description</strong>: Specifies the maximum memory that can be used by the communication library cache on a single DN.</p>
<p id="EN-US_TOPIC_0000001764491904__p432324073520"><strong id="EN-US_TOPIC_0000001764491904__b113108246241">Type</strong>: SIGHUP</p>
<p id="EN-US_TOPIC_0000001764491904__a52ca0dee530345ba918c5ddc9e1f24ab"><strong id="EN-US_TOPIC_0000001764491904__b1989824165010">Value range</strong>: an integer ranging from 1 to 256. The default unit is KB. The minimum size cannot be less than 1 GB for installation.</p>
<p id="EN-US_TOPIC_0000001764491904__ae7b9eb996c454e0d83bddb26e4832757"><strong id="EN-US_TOPIC_0000001764491904__b1150535513262">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b2505755192617">max_process_memory/8</strong></p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__n746da6d206ec4140b4d31a1be91bd1db"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001764491904__a3c346c852a1b42418faa1038327c7517">This parameter must be specifically set based on environment memory and the deployment method. If it is too large, out-of-memory (OOM) may occur. If it is too small, the performance of the communication library may deteriorate.</p>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__section10300238238"><h4 class="sectiontitle">comm_client_bind</h4><p id="EN-US_TOPIC_0000001764491904__p1544414596245"><strong id="EN-US_TOPIC_0000001764491904__b48192534313">Parameter description</strong>: Specifies whether to bind the client of the communication library to a specified IP address when the client initiates a connection.</p>
<p id="EN-US_TOPIC_0000001764491904__p62323703711"><strong id="EN-US_TOPIC_0000001764491904__b10156346104512">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__p18449205913245"><strong id="EN-US_TOPIC_0000001764491904__b1866430132015">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001764491904__ul147110332071"><li id="EN-US_TOPIC_0000001764491904__li146063918717"><strong id="EN-US_TOPIC_0000001764491904__b842352706193036">on</strong> indicates that the client is bound to a specified IP address.</li><li id="EN-US_TOPIC_0000001764491904__li347243319716"><strong id="EN-US_TOPIC_0000001764491904__b201625407519323">off</strong> indicates that the client is not bound to any IP addresses.</li></ul>
<div class="notice" id="EN-US_TOPIC_0000001764491904__note847772834"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001764491904__p1847792034">If multiple IP addresses of a node in a cluster are on the same communication network segment, set this parameter to <strong id="EN-US_TOPIC_0000001764491904__b842352706193332">on</strong>. In this case, the client is bound to the IP address specified by <strong id="EN-US_TOPIC_0000001764491904__b842352706193526">listen_addresses</strong>. The concurrency performance of a cluster depends on the number of random ports because a port can be used only by one client at a time.</p>
</div></div>
<p id="EN-US_TOPIC_0000001764491904__p19456738194415"><strong id="EN-US_TOPIC_0000001764491904__b55233292105553">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b842352706172155">off</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__section1371661611123"><h4 class="sectiontitle">comm_no_delay</h4><p id="EN-US_TOPIC_0000001764491904__p594213561126"><strong id="EN-US_TOPIC_0000001764491904__b8423527061609">Parameter description</strong>: Specifies whether to use the <strong id="EN-US_TOPIC_0000001764491904__b84235270616035">NO_DELAY</strong> attribute of the communication library connection. Restart the cluster for the setting to take effect.</p>
<p id="EN-US_TOPIC_0000001764491904__p9343161713515"><strong id="EN-US_TOPIC_0000001764491904__b1331594664519">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__p56607432091"><strong id="EN-US_TOPIC_0000001764491904__b149320222010">Value range</strong>: Boolean</p>
<p id="EN-US_TOPIC_0000001764491904__p573061612123"><strong id="EN-US_TOPIC_0000001764491904__b1912974503">Default value:</strong> <strong id="EN-US_TOPIC_0000001764491904__b1613345808">off</strong></p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__note272911610123"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001764491904__p87292016151210">If packet loss occurs because a large number of packets are received per second, set this parameter to <strong id="EN-US_TOPIC_0000001764491904__b8423527061611">off</strong> to reduce the total number of packets.</p>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__sb8def77414ca46c19425b8b6365ab8e9"><h4 class="sectiontitle">comm_debug_mode</h4><p id="EN-US_TOPIC_0000001764491904__a3452b6b3223a412aba23244d00af1d65"><strong id="EN-US_TOPIC_0000001764491904__b122324715554">Parameter description</strong>: Specifies the debug mode of the communication library, that is, whether to print logs about the communication layer. The setting is effective at the session layer.</p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__n53cba812328a4483bad9bc2f0989c718"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001764491904__a356b2c184530422ea3a5ea708e345832">When the switch is set to <strong id="EN-US_TOPIC_0000001764491904__b84235270692827">on</strong>, the number of printed logs is huge, adding extra overhead and reducing database performance. Therefore, set the switch to <strong id="EN-US_TOPIC_0000001764491904__b84235270692943">on</strong> only in the debug mode.</p>
</div></div>
<p id="EN-US_TOPIC_0000001764491904__p133891517379"><strong id="EN-US_TOPIC_0000001764491904__b348594614457">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__adddaf195065044acba5256d4e701e262"><strong id="EN-US_TOPIC_0000001764491904__b166751153207">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001764491904__u18af3bbd2e3a45d39a5b18224fae0024"><li id="EN-US_TOPIC_0000001764491904__le92023613a724909941e72f8529e3360"><strong id="EN-US_TOPIC_0000001764491904__b842352706204212">on</strong> indicates the detailed debug log of the communication library is printed.</li><li id="EN-US_TOPIC_0000001764491904__lefa74aa46f5c466b9c26c206ef928c9e"><strong id="EN-US_TOPIC_0000001764491904__b751002536">off</strong> indicates the detailed debug log of the communication library is not printed.</li></ul>
<p id="EN-US_TOPIC_0000001764491904__af2013f97c9294f2597431886a67b8a24"><strong id="EN-US_TOPIC_0000001764491904__b1513318424">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b1814710380">off</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__section1480831194112"><h4 class="sectiontitle">comm_ackchk_time</h4><p id="EN-US_TOPIC_0000001764491904__p10567191642812"><strong id="EN-US_TOPIC_0000001764491904__b106620241367">Parameter description</strong>: Specifies the duration after which the communication library server automatically triggers ACK when no data package is received.</p>
<p id="EN-US_TOPIC_0000001764491904__p7342108163510"><strong id="EN-US_TOPIC_0000001764491904__b1775822519515">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__p175431345143219"><strong id="EN-US_TOPIC_0000001764491904__b7142132815113">Value range</strong>: an integer ranging from 0 to 20000. The unit is millisecond (ms). <strong id="EN-US_TOPIC_0000001764491904__b1085616280360">0</strong> indicates that automatic ACK triggering is disabled.</p>
<p id="EN-US_TOPIC_0000001764491904__p1756819164283"><strong id="EN-US_TOPIC_0000001764491904__b3187133014368">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b1318753053620">2000</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__s01da04f06f5143a691139b5908bfc29c"><h4 class="sectiontitle">comm_timer_mode</h4><p id="EN-US_TOPIC_0000001764491904__aa67a5fde2c5b44b89098c5683e732420"><strong id="EN-US_TOPIC_0000001764491904__b946110148568">Parameter description</strong>: Specifies the timer mode of the communication library, that is, whether to print timer logs in each phase of the communication layer. The setting is effective at the session layer.</p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__nee2097280bf245c19bcf07d4038f8bae"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001764491904__a950e88c4a2144128a63246a66e4ba2e7">When the switch is set to <strong id="EN-US_TOPIC_0000001764491904__b24902681">on</strong>, the number of printed logs is huge, adding extra overhead and reducing database performance. Therefore, set the switch to <strong id="EN-US_TOPIC_0000001764491904__b664914136">on</strong> only in the debug mode.</p>
</div></div>
<p id="EN-US_TOPIC_0000001764491904__p1885117216380"><strong id="EN-US_TOPIC_0000001764491904__b12833114634512">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__a156f80a602644998b77519f80e9d5bce"><strong id="EN-US_TOPIC_0000001764491904__b184937142016">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001764491904__u856013d6cff54d6192eb7fc423c8a961"><li id="EN-US_TOPIC_0000001764491904__lff68006519304e50b65c7067871b8eaa"><strong id="EN-US_TOPIC_0000001764491904__b1826794721">on</strong> indicates the detailed timer log of the communication library is printed.</li><li id="EN-US_TOPIC_0000001764491904__l1d659c4078ca474d8471b80cf6bd5e3b"><strong id="EN-US_TOPIC_0000001764491904__b679247701">off</strong> indicates the detailed timer log of the communication library is not printed.</li></ul>
<p id="EN-US_TOPIC_0000001764491904__ae15d67595cc846409c79e4c337a01b82"><strong id="EN-US_TOPIC_0000001764491904__b428541327">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b1224258519">off</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__sfb69d5c3242545fc87c5c68eea685a61"><h4 class="sectiontitle">comm_stat_mode</h4><p id="EN-US_TOPIC_0000001764491904__a53bd5ffbd6a0426095f38c3f8802dfe9"><strong id="EN-US_TOPIC_0000001764491904__b1299105153715">Parameter description</strong>: Specifies the stat mode of the communication library, that is, whether to print statistics about the communication layer. The setting is effective at the session layer.</p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__n3ca15f09cf374036961b7b2d4996f592"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001764491904__a5e09dbe0889a4553bc71b5ada4b98737">When the switch is set to <strong id="EN-US_TOPIC_0000001764491904__b447281105">on</strong>, the number of printed logs is huge, adding extra overhead and reducing database performance. Therefore, set the switch to <strong id="EN-US_TOPIC_0000001764491904__b971325164">on</strong> only in the debug mode.</p>
</div></div>
<p id="EN-US_TOPIC_0000001764491904__p12398211133810"><strong id="EN-US_TOPIC_0000001764491904__b11997134674517">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__a699860714a37485b8637987ed3fed0dc"><strong id="EN-US_TOPIC_0000001764491904__b1676517819203">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001764491904__u99067cb9b5364f94b895a19be98b0a08"><li id="EN-US_TOPIC_0000001764491904__l4b7e3f02a2b44fc8b27f358a038eb9c3"><strong id="EN-US_TOPIC_0000001764491904__b1674105588">on</strong> indicates the statistics log of the communication library is printed.</li><li id="EN-US_TOPIC_0000001764491904__ld15fbab485f442ecaff0fbe5cd0b9854"><strong id="EN-US_TOPIC_0000001764491904__b434615572">off</strong> indicates the statistics log of the communication library is not printed.</li></ul>
<p id="EN-US_TOPIC_0000001764491904__a5ac642a79f734413b4438e692f20517f"><strong id="EN-US_TOPIC_0000001764491904__b1407794067">Default value:</strong> <strong id="EN-US_TOPIC_0000001764491904__b1788020107">off</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__section253573278"><h4 class="sectiontitle">client_connection_check_interval</h4><p id="EN-US_TOPIC_0000001764491904__p175157152712"><strong id="EN-US_TOPIC_0000001764491904__b129681733203819">Parameter description</strong>: Specifies the interval for checking the client connection status. This parameter is supported by clusters of version 8.2.0 or later.</p>
<p id="EN-US_TOPIC_0000001764491904__p356574277"><strong id="EN-US_TOPIC_0000001764491904__b531930086">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__p14512572277"><strong id="EN-US_TOPIC_0000001764491904__b7565712711">Value range</strong>: an integer ranging from 0 to INT_MAX. The unit is ms. The value <strong id="EN-US_TOPIC_0000001764491904__b253876598101810">0</strong> indicates that the client connection status is not checked.</p>
<p id="EN-US_TOPIC_0000001764491904__p35165715273"><strong id="EN-US_TOPIC_0000001764491904__b5385444743057">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b107069971143057">10000</strong></p>
<div class="notice" id="EN-US_TOPIC_0000001764491904__note19619573275"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001764491904__p3457312123810">During a long query executed in a session where a client (such as gsql, JDBC, or ODBC) directly connects to the CN,</p>
<ul id="EN-US_TOPIC_0000001764491904__ul438803495712"><li id="EN-US_TOPIC_0000001764491904__li16389734165712">The CN checks the client connection status at the interval specified by <strong id="EN-US_TOPIC_0000001764491904__b61511625184020">client_connection_check_interval</strong>. If it detects that the client has been disconnected from the CN, the server terminates the long query and releases related resources to avoid waste of cluster resources.</li><li id="EN-US_TOPIC_0000001764491904__li17174164855717">The DN checks its connection to the CN at the interval specified by <strong id="EN-US_TOPIC_0000001764491904__b023435134010">client_connection_check_interval</strong>. If the DN detects that it has been disconnected from the CN, it terminates the long query and releases related resources to avoid waste of cluster resources.</li></ul>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001764491904__section174841243195210"><h4 class="sectiontitle">conn_recycle_timeout</h4><p id="EN-US_TOPIC_0000001764491904__p164217301000"><strong id="EN-US_TOPIC_0000001764491904__b562824815369">Parameter description</strong>: the interval for reclaiming idle connections between a CN and other nodes to the connection pool. This parameter is supported only by clusters of version 8.2.1 or later.</p>
<p id="EN-US_TOPIC_0000001764491904__p1986753945615"><strong id="EN-US_TOPIC_0000001764491904__b787642567">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001764491904__p37601746185112"><strong id="EN-US_TOPIC_0000001764491904__b1926053393714">Value range</strong>: an integer ranging from 0 to 3600, in second (s). <strong id="EN-US_TOPIC_0000001764491904__b144887123382">0</strong> indicates that the function of reclaiming idle connections is disabled.</p>
<p id="EN-US_TOPIC_0000001764491904__p11760114605119"><strong id="EN-US_TOPIC_0000001764491904__b988570969101810">Default value</strong>: <strong id="EN-US_TOPIC_0000001764491904__b605442527101810">30</strong></p>
</div>
</div>
<div>
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