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Lu, Huayi e6fa411af0 DWS DEV 830.201 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2024-05-16 07:24:04 +00:00

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<a name="EN-US_TOPIC_0000001188323630"></a><a name="EN-US_TOPIC_0000001188323630"></a>
<h1 class="topictitle1">Communication Library Parameters</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001188323630__en-us_topic_0059778583_p54955141810">This section describes parameter settings and value ranges for communication libraries.</p>
<div class="section" id="EN-US_TOPIC_0000001188323630__s0011acc521b848fe85b25a68f534dc73"><a name="EN-US_TOPIC_0000001188323630__s0011acc521b848fe85b25a68f534dc73"></a><a name="s0011acc521b848fe85b25a68f534dc73"></a><h4 class="sectiontitle">comm_max_datanode</h4><p id="EN-US_TOPIC_0000001188323630__aaa6dd1c9c3d8452b8edd21d8d803e21e"><strong id="EN-US_TOPIC_0000001188323630__b1963328915">Parameter description</strong>: Specifies the maximum number of DNs supported by the TCP proxy communication library or SCTP communication library.</p>
<p id="EN-US_TOPIC_0000001188323630__p128352383717"><strong id="EN-US_TOPIC_0000001188323630__b17110124519454">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001188323630__a8b81a0eaedf04156b377e670b33f1e6d"><strong id="EN-US_TOPIC_0000001188323630__b1755519300498">Value range</strong>: an integer ranging from 1 to 8192</p>
<p id="EN-US_TOPIC_0000001188323630__a48448b884a784234b18b4bb0f23db73e"><strong id="EN-US_TOPIC_0000001188323630__b49081319145711">Default value</strong>: actual number of DNs</p>
<div class="notice" id="EN-US_TOPIC_0000001188323630__note959519271220"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__p259517276227">If the number of DNs is increased, the change takes effect immediately. If the number of DNs is reduced, the cluster needs to be restarted for the change to take effect.</p>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__s9ef3426b35d140bb934db112acc751f2"><h4 class="sectiontitle">comm_max_stream</h4><p id="EN-US_TOPIC_0000001188323630__a5ad0de68b57d4501a63e559a75f1e58b"><strong id="EN-US_TOPIC_0000001188323630__b2318220155010">Parameter description</strong>: Specifies the maximum number of concurrent data streams supported by the TCP proxy communication library or SCTP communication library. The value of this parameter must be greater than: Number of concurrent data streams x Number of operators in each stream x Square of SMP.</p>
<p id="EN-US_TOPIC_0000001188323630__p15342512133615"><strong id="EN-US_TOPIC_0000001188323630__b113070456456">Type</strong>: POSTMASTER</p>
<p id="EN-US_TOPIC_0000001188323630__a90a9143d554441ce8d8e372938b11cf5"><strong id="EN-US_TOPIC_0000001188323630__b48234134911">Value range</strong>: an integer ranging from 1 to 60000</p>
<p id="EN-US_TOPIC_0000001188323630__a4d3e94d57fc54323af104ca7b77c0f50"><strong id="EN-US_TOPIC_0000001188323630__b069185613571">Default value</strong>: calculated by the following formula: min (query_dop_limit x query_dop_limit x 2 x 20, max_process_memory (bytes) x 0.025/(Maximum number of CNs + Number of current DNs)/260. If the value is less than 1024, 1024 is used. query_dop_limit = Number of CPU cores of a single server/Number of DNs of a single server.</p>
<div class="note" id="EN-US_TOPIC_0000001188323630__note9292114813213"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001188323630__ul176719509211"><li id="EN-US_TOPIC_0000001188323630__li7767165022114">You are not advised to set this parameter to a large value because this will cause high memory usage (256 bytes x <strong id="EN-US_TOPIC_0000001188323630__b871913196311">comm_max_stream</strong> x <strong id="EN-US_TOPIC_0000001188323630__b8719919143118">comm_max_datanode</strong>). If the number of concurrent data streams is large, the query is complex and the smp is large, resulting in insufficient memory.</li><li id="EN-US_TOPIC_0000001188323630__li2768115022117">If the value of <a href="#EN-US_TOPIC_0000001188323630__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_0000001188323630__b685653433112">comm_max_stream</strong>.</li></ul>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__section16782547103210"><h4 class="sectiontitle">max_stream_pool</h4><p id="EN-US_TOPIC_0000001188323630__p478244703217"><strong id="EN-US_TOPIC_0000001188323630__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_0000001188323630__p1078212479322"><strong id="EN-US_TOPIC_0000001188323630__b14967913185417">Type</strong>: SUSET</p>
<p id="EN-US_TOPIC_0000001188323630__p3782104718323"><strong id="EN-US_TOPIC_0000001188323630__b18403132342019">Value range</strong>: an integer ranging from -1 to INT_MAX. The values <strong id="EN-US_TOPIC_0000001188323630__b1771874012017">-1</strong> and<strong id="EN-US_TOPIC_0000001188323630__b2132443122010"> 0</strong> indicate that the stream thread pool is disabled.</p>
<p id="EN-US_TOPIC_0000001188323630__p1478244714324"><strong id="EN-US_TOPIC_0000001188323630__b1533033455411">Default value</strong>: <strong id="EN-US_TOPIC_0000001188323630__b433013412549">65535</strong></p>
<div class="note" id="EN-US_TOPIC_0000001188323630__note1278284733213"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001188323630__ul17823473324"><li id="EN-US_TOPIC_0000001188323630__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_0000001188323630__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_0000001188323630__li5665634417">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_0000001188323630__s13d650215c0240f9b20b48dada4ed06d"><h4 class="sectiontitle">comm_max_receiver</h4><p id="EN-US_TOPIC_0000001188323630__acacfc605b7434605a4149d3a90968526"><strong id="EN-US_TOPIC_0000001188323630__b387568176">Parameter description</strong>: Specifies the maximum number of receiving threads for the TCP proxy communication library or SCTP communication library.</p>
<p id="EN-US_TOPIC_0000001188323630__p19393172143615"><strong id="EN-US_TOPIC_0000001188323630__b15470045174513">Type</strong>: POSTMASTER</p>
<p id="EN-US_TOPIC_0000001188323630__a590ca73f02734f53858cd9e9d71145de"><strong id="EN-US_TOPIC_0000001188323630__b6827114854915">Value range</strong>: an integer ranging from 1 to 50</p>
<p id="EN-US_TOPIC_0000001188323630__aefa90cc94c0b4c59986930d70ee8d871"><strong id="EN-US_TOPIC_0000001188323630__b84235270614205">Default value</strong>: 4</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__s34f28849693d456e8dbf8c8147301012"><h4 class="sectiontitle">comm_quota_size</h4><p id="EN-US_TOPIC_0000001188323630__adfd6547d569040fcac9e7bd8a793a384"><strong id="EN-US_TOPIC_0000001188323630__b1585711384">Parameter description</strong>: Specifies the maximum size of packets that can be consecutively sent by the TCP proxy communication library or SCTP 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_0000001188323630__p18740205493511"><strong id="EN-US_TOPIC_0000001188323630__b3637174524517">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001188323630__ab2d345b5f8364a629db6aa8e973709dd"><strong id="EN-US_TOPIC_0000001188323630__b8806105145011">Value range</strong>: an integer ranging from 0 to 102400. The default unit is KB. The value <strong id="EN-US_TOPIC_0000001188323630__b88051142123015">0</strong> indicates that the quota mechanism is not used.</p>
<p id="EN-US_TOPIC_0000001188323630__aa2e4fdd7351b4393a8bb992da80d5ac7"><strong id="EN-US_TOPIC_0000001188323630__b18024168155138">Default value</strong>: <strong id="EN-US_TOPIC_0000001188323630__b842352706193057">1 MB</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__sfade85f464b14ac4bbb0b00be030fcbc"><h4 class="sectiontitle">comm_usable_memory</h4><p id="EN-US_TOPIC_0000001188323630__aba077b0b16da47cfb17ab42117db4134"><strong id="EN-US_TOPIC_0000001188323630__b1780294684">Parameter description</strong>: Specifies the maximum memory available for buffering on the TCP proxy communication library or SCTP communication library on a single DN.</p>
<p id="EN-US_TOPIC_0000001188323630__p432324073520"><strong id="EN-US_TOPIC_0000001188323630__b381315453457">Type</strong>: POSTMASTER</p>
<p id="EN-US_TOPIC_0000001188323630__a52ca0dee530345ba918c5ddc9e1f24ab"><strong id="EN-US_TOPIC_0000001188323630__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_0000001188323630__ae7b9eb996c454e0d83bddb26e4832757"><strong id="EN-US_TOPIC_0000001188323630__b1150535513262">Default value</strong>: <strong id="EN-US_TOPIC_0000001188323630__b2505755192617">max_process_memory/8</strong></p>
<div class="notice" id="EN-US_TOPIC_0000001188323630__n746da6d206ec4140b4d31a1be91bd1db"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__a3c346c852a1b42418faa1038327c7517">This parameter must be specifically set based on environment memory and the deployment method. If it is too large, there may be out-of-memory (OOM). If it is too small, the performance of the TCP proxy communication library or SCTP communication library may deteriorate.</p>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__section165486311620"><h4 class="sectiontitle">comm_memory_pool_percent</h4><p id="EN-US_TOPIC_0000001188323630__p1554911314169"><strong id="EN-US_TOPIC_0000001188323630__b0660124182115">Parameter description</strong>: Specifies the percentage of the memory pool resources that can be used by the TCP proxy communication library or the SCTP communication library in a DN. This parameter is used to adaptively reserve memory used by the communication libraries.</p>
<p id="EN-US_TOPIC_0000001188323630__p0230129203514"><strong id="EN-US_TOPIC_0000001188323630__b179873451456">Type</strong>: POSTMASTER</p>
<p id="EN-US_TOPIC_0000001188323630__p185551133162"><strong id="EN-US_TOPIC_0000001188323630__b2696125418505">Value range</strong>: an integer ranging from 0 to 100</p>
<p id="EN-US_TOPIC_0000001188323630__p855715331610"><strong id="EN-US_TOPIC_0000001188323630__b1520540678">Default value</strong>: <strong id="EN-US_TOPIC_0000001188323630__b1860486963">0</strong></p>
<div class="notice" id="EN-US_TOPIC_0000001188323630__note155518315169"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__p17552836166">If the memory used by the communication library is small, set this parameter to a small value. Otherwise, set it to a large value.</p>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__section10300238238"><h4 class="sectiontitle">comm_client_bind</h4><p id="EN-US_TOPIC_0000001188323630__p1544414596245"><strong id="EN-US_TOPIC_0000001188323630__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_0000001188323630__p62323703711"><strong id="EN-US_TOPIC_0000001188323630__b10156346104512">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001188323630__p18449205913245"><strong id="EN-US_TOPIC_0000001188323630__b1866430132015">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001188323630__ul147110332071"><li id="EN-US_TOPIC_0000001188323630__li146063918717"><strong id="EN-US_TOPIC_0000001188323630__b842352706193036">on</strong> indicates that the client is bound to a specified IP address.</li><li id="EN-US_TOPIC_0000001188323630__li347243319716"><strong id="EN-US_TOPIC_0000001188323630__b201625407519323">off</strong> indicates that the client is not bound to any IP addresses.</li></ul>
<div class="notice" id="EN-US_TOPIC_0000001188323630__note847772834"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__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_0000001188323630__b842352706193332">on</strong>. In this case, the client is bound to the IP address specified by <strong id="EN-US_TOPIC_0000001188323630__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_0000001188323630__p19456738194415"><strong id="EN-US_TOPIC_0000001188323630__b55233292105553">Default value</strong>: <strong id="EN-US_TOPIC_0000001188323630__b842352706172155">off</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__section1371661611123"><h4 class="sectiontitle">comm_no_delay</h4><p id="EN-US_TOPIC_0000001188323630__p594213561126"><strong id="EN-US_TOPIC_0000001188323630__b8423527061609">Parameter description</strong>: Specifies whether to use the <strong id="EN-US_TOPIC_0000001188323630__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_0000001188323630__p9343161713515"><strong id="EN-US_TOPIC_0000001188323630__b1331594664519">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001188323630__p56607432091"><strong id="EN-US_TOPIC_0000001188323630__b149320222010">Value range</strong>: Boolean</p>
<p id="EN-US_TOPIC_0000001188323630__p573061612123"><strong id="EN-US_TOPIC_0000001188323630__b447506585">Default value:</strong> <strong id="EN-US_TOPIC_0000001188323630__b1826092905">off</strong></p>
<div class="notice" id="EN-US_TOPIC_0000001188323630__note272911610123"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__p87292016151210">If packet loss occurs because a large number of packets are received per second, set this parameter to <strong id="EN-US_TOPIC_0000001188323630__b8423527061611">off</strong> to reduce the total number of packets.</p>
</div></div>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__sb8def77414ca46c19425b8b6365ab8e9"><h4 class="sectiontitle">comm_debug_mode</h4><p id="EN-US_TOPIC_0000001188323630__a3452b6b3223a412aba23244d00af1d65"><strong id="EN-US_TOPIC_0000001188323630__b122324715554">Parameter description</strong>: Specifies the debug mode of the TCP proxy communication library or SCTP 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_0000001188323630__n53cba812328a4483bad9bc2f0989c718"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__a356b2c184530422ea3a5ea708e345832">When the switch is set to <strong id="EN-US_TOPIC_0000001188323630__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_0000001188323630__b84235270692943">on</strong> only in the debug mode.</p>
</div></div>
<p id="EN-US_TOPIC_0000001188323630__p133891517379"><strong id="EN-US_TOPIC_0000001188323630__b348594614457">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001188323630__adddaf195065044acba5256d4e701e262"><strong id="EN-US_TOPIC_0000001188323630__b166751153207">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001188323630__u18af3bbd2e3a45d39a5b18224fae0024"><li id="EN-US_TOPIC_0000001188323630__le92023613a724909941e72f8529e3360"><strong id="EN-US_TOPIC_0000001188323630__b842352706204212">on</strong> indicates the detailed debug log of the communication library is printed.</li><li id="EN-US_TOPIC_0000001188323630__lefa74aa46f5c466b9c26c206ef928c9e"><strong id="EN-US_TOPIC_0000001188323630__b642247649">off</strong> indicates the detailed debug log of the communication library is not printed.</li></ul>
<p id="EN-US_TOPIC_0000001188323630__af2013f97c9294f2597431886a67b8a24"><strong id="EN-US_TOPIC_0000001188323630__b843197746">Default value</strong>: <strong id="EN-US_TOPIC_0000001188323630__b513426021">off</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__section1480831194112"><h4 class="sectiontitle">comm_ackchk_time</h4><p id="EN-US_TOPIC_0000001188323630__p10567191642812"><strong id="EN-US_TOPIC_0000001188323630__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_0000001188323630__p7342108163510"><strong id="EN-US_TOPIC_0000001188323630__b1775822519515">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001188323630__p175431345143219"><strong id="EN-US_TOPIC_0000001188323630__b7142132815113">Value range</strong>: an integer ranging from 0 to 20000. The unit is millisecond (ms). <strong id="EN-US_TOPIC_0000001188323630__b1085616280360">0</strong> indicates that automatic ACK triggering is disabled.</p>
<p id="EN-US_TOPIC_0000001188323630__p1756819164283"><strong id="EN-US_TOPIC_0000001188323630__b3187133014368">Default value</strong>: <strong id="EN-US_TOPIC_0000001188323630__b1318753053620">2000</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__s01da04f06f5143a691139b5908bfc29c"><h4 class="sectiontitle">comm_timer_mode</h4><p id="EN-US_TOPIC_0000001188323630__aa67a5fde2c5b44b89098c5683e732420"><strong id="EN-US_TOPIC_0000001188323630__b946110148568">Parameter description</strong>: Specifies the timer mode of the TCP proxy communication library or SCTP 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_0000001188323630__nee2097280bf245c19bcf07d4038f8bae"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__a950e88c4a2144128a63246a66e4ba2e7">When the switch is set to <strong id="EN-US_TOPIC_0000001188323630__b1282103850">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_0000001188323630__b1519686137">on</strong> only in the debug mode.</p>
</div></div>
<p id="EN-US_TOPIC_0000001188323630__p1885117216380"><strong id="EN-US_TOPIC_0000001188323630__b12833114634512">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001188323630__a156f80a602644998b77519f80e9d5bce"><strong id="EN-US_TOPIC_0000001188323630__b184937142016">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001188323630__u856013d6cff54d6192eb7fc423c8a961"><li id="EN-US_TOPIC_0000001188323630__lff68006519304e50b65c7067871b8eaa"><strong id="EN-US_TOPIC_0000001188323630__b1010700213">on</strong> indicates the detailed timer log of the communication library is printed.</li><li id="EN-US_TOPIC_0000001188323630__l1d659c4078ca474d8471b80cf6bd5e3b"><strong id="EN-US_TOPIC_0000001188323630__b1110062337">off</strong> indicates the detailed timer log of the communication library is not printed.</li></ul>
<p id="EN-US_TOPIC_0000001188323630__ae15d67595cc846409c79e4c337a01b82"><strong id="EN-US_TOPIC_0000001188323630__b232408409">Default value</strong>: <strong id="EN-US_TOPIC_0000001188323630__b73970050">off</strong></p>
</div>
<div class="section" id="EN-US_TOPIC_0000001188323630__sfb69d5c3242545fc87c5c68eea685a61"><h4 class="sectiontitle">comm_stat_mode</h4><p id="EN-US_TOPIC_0000001188323630__a53bd5ffbd6a0426095f38c3f8802dfe9"><strong id="EN-US_TOPIC_0000001188323630__b1890216402566">Parameter description</strong>: Specifies the statistics mode of the TCP proxy communication library or SCTP 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_0000001188323630__n3ca15f09cf374036961b7b2d4996f592"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__a5e09dbe0889a4553bc71b5ada4b98737">When the switch is set to <strong id="EN-US_TOPIC_0000001188323630__b1948599799">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_0000001188323630__b106672899">on</strong> only in the debug mode.</p>
</div></div>
<p id="EN-US_TOPIC_0000001188323630__p12398211133810"><strong id="EN-US_TOPIC_0000001188323630__b11997134674517">Type</strong>: USERSET</p>
<p id="EN-US_TOPIC_0000001188323630__a699860714a37485b8637987ed3fed0dc"><strong id="EN-US_TOPIC_0000001188323630__b1676517819203">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001188323630__u99067cb9b5364f94b895a19be98b0a08"><li id="EN-US_TOPIC_0000001188323630__l4b7e3f02a2b44fc8b27f358a038eb9c3"><strong id="EN-US_TOPIC_0000001188323630__b1277167964">on</strong> indicates the statistics log of the communication library is printed.</li><li id="EN-US_TOPIC_0000001188323630__ld15fbab485f442ecaff0fbe5cd0b9854"><strong id="EN-US_TOPIC_0000001188323630__b2145133813">off</strong> indicates the statistics log of the communication library is not printed.</li></ul>
<p id="EN-US_TOPIC_0000001188323630__a5ac642a79f734413b4438e692f20517f"><strong id="EN-US_TOPIC_0000001188323630__b626697651">Default value:</strong> <strong id="EN-US_TOPIC_0000001188323630__b643877242">off</strong></p>
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<div class="section" id="EN-US_TOPIC_0000001188323630__section12442191418411"><h4 class="sectiontitle">enable_stateless_pooler_reuse</h4><p id="EN-US_TOPIC_0000001188323630__p345181413414"><strong id="EN-US_TOPIC_0000001188323630__b84235270619510">Parameter description</strong>: Specifies whether to enable the pooler reuse mode. The setting takes effect after the cluster is restarted.</p>
<p id="EN-US_TOPIC_0000001188323630__p299712563342"><strong id="EN-US_TOPIC_0000001188323630__b1517194716455">Type</strong>: POSTMASTER</p>
<p id="EN-US_TOPIC_0000001188323630__p13468181474115"><strong id="EN-US_TOPIC_0000001188323630__b12415810202013">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001188323630__ul1474714174110"><li id="EN-US_TOPIC_0000001188323630__li106616206178"><strong id="EN-US_TOPIC_0000001188323630__b842352706104112">on</strong> or <strong id="EN-US_TOPIC_0000001188323630__b842352706104114">true</strong> indicates that the pooler reuse mode is enabled.</li><li id="EN-US_TOPIC_0000001188323630__li749314916179"><strong id="EN-US_TOPIC_0000001188323630__b177707619910424">off</strong> or <strong id="EN-US_TOPIC_0000001188323630__b11769586010424">false</strong> indicates that the pooler reuse mode is disabled.<div class="notice" id="EN-US_TOPIC_0000001188323630__note144911314124115"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__p6498111444114">Set this parameter to the same value for CNs and DNs. If <strong id="EN-US_TOPIC_0000001188323630__b842352706193243">enable_stateless_pooler_reuse</strong> is set to <strong id="EN-US_TOPIC_0000001188323630__b842352706194826">off</strong> for CNs and set to <strong id="EN-US_TOPIC_0000001188323630__b842352706195059">on</strong> for DNs, the cluster communication fails. Restart the cluster to make the setting take effect.</p>
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</li></ul>
<p id="EN-US_TOPIC_0000001188323630__p165011714114114"><strong id="EN-US_TOPIC_0000001188323630__b783572069">Default value</strong>: <strong id="EN-US_TOPIC_0000001188323630__b1301772273">off</strong></p>
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<div class="section" id="EN-US_TOPIC_0000001188323630__section350111241138"><h4 class="sectiontitle">comm_cn_dn_logic_conn</h4><p id="EN-US_TOPIC_0000001188323630__p145011624111315"><strong id="EN-US_TOPIC_0000001188323630__b20946281475">Parameter description</strong>: Specifies a switch for logical connections between CNs and DNs. The parameter setting takes effect only after the cluster is restarted.</p>
<p id="EN-US_TOPIC_0000001188323630__p1125154194010"><strong id="EN-US_TOPIC_0000001188323630__b8346124724519">Type</strong>: POSTMASTER</p>
<p id="EN-US_TOPIC_0000001188323630__p35175248136"><strong id="EN-US_TOPIC_0000001188323630__b196471714204">Value range</strong>: Boolean</p>
<ul id="EN-US_TOPIC_0000001188323630__ul145179241136"><li id="EN-US_TOPIC_0000001188323630__li10517132419139"><strong id="EN-US_TOPIC_0000001188323630__b953082632417">on</strong> or <strong id="EN-US_TOPIC_0000001188323630__b2053022616243">true</strong> indicates that the connections between CNs and DNs are logical, with the libcomm component in use.</li><li id="EN-US_TOPIC_0000001188323630__li151712411313"><strong id="EN-US_TOPIC_0000001188323630__b166047310502">off</strong> or <strong id="EN-US_TOPIC_0000001188323630__b184013615504">false</strong> indicates that the connections between CNs and DNs are physical, with the libpq component in use.<div class="notice" id="EN-US_TOPIC_0000001188323630__note153212481310"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="EN-US_TOPIC_0000001188323630__p167291746171712">If <strong id="EN-US_TOPIC_0000001188323630__b4667346165016">comm_cn_dn_logic_conn</strong> is set to <strong id="EN-US_TOPIC_0000001188323630__b1535414509503">off</strong> for CNs and set to <strong id="EN-US_TOPIC_0000001188323630__b117690212516">on</strong> for DNs, cluster communication will fail. You are advised to set this parameter to the same value for all CNs and DNs. Restart the cluster to make the setting take effect.</p>
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</li></ul>
<p id="EN-US_TOPIC_0000001188323630__p11532192461318"><strong id="EN-US_TOPIC_0000001188323630__b1268309166">Default value:</strong> <strong id="EN-US_TOPIC_0000001188323630__b497501698">off</strong></p>
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</div>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_04_0888.html">Connection and Authentication</a></div>
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