forked from docs/doc-exports
Lu, Huayi
e6fa411af0
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>
58 lines
11 KiB
HTML
58 lines
11 KiB
HTML
<a name="EN-US_TOPIC_0000001233883245"></a><a name="EN-US_TOPIC_0000001233883245"></a>
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<h1 class="topictitle1">Asynchronous I/O Operations</h1>
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<div id="body8662426"><div class="section" id="EN-US_TOPIC_0000001233883245__sf18d1368b44a45a68de6ca9e975a8e77"><h4 class="sectiontitle">enable_adio_debug</h4><p id="EN-US_TOPIC_0000001233883245__a3eefaf0871fd4849a83a969cfc67ca5a"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_a109e5ee23a734e7ea650d070f3413d6c">Parameter description</strong>: Specifies whether O&M personnel are allowed to generate some ADIO logs to locate ADIO issues. This parameter is used only by developers. Common users are advised not to use it.</p>
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<p id="EN-US_TOPIC_0000001233883245__p18312194119317"><strong id="EN-US_TOPIC_0000001233883245__b1783416012234">Type</strong>: SUSET</p>
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<p id="EN-US_TOPIC_0000001233883245__a8d2cc5c6adb84537ac3da571b7aa9c6c"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778487_aa1fc9bedad6b4779a216c176c5046dcc">Value range</strong>: Boolean</p>
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<ul id="EN-US_TOPIC_0000001233883245__u1903e405a11149ce9fa8addc3c06b3be"><li id="EN-US_TOPIC_0000001233883245__l622550f5ea85463e8b0b0ee7e0469273"><strong id="EN-US_TOPIC_0000001233883245__b842352706102618">on</strong> or <strong id="EN-US_TOPIC_0000001233883245__b84235270611225">true</strong> indicates the log switch is enabled.</li><li id="EN-US_TOPIC_0000001233883245__l0864563c41a6474da2c46a77f640f152"><strong id="EN-US_TOPIC_0000001233883245__b842352706102625">off</strong> or <strong id="EN-US_TOPIC_0000001233883245__b842352706112227">false</strong> indicates the log switch is disabled.</li></ul>
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<p id="EN-US_TOPIC_0000001233883245__a3178b4dcd92b4db992cf310264fb2c7d"><strong id="EN-US_TOPIC_0000001233883245__b14485191810400">Default value</strong>: <strong id="EN-US_TOPIC_0000001233883245__b24877187409">off</strong></p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001233883245__s9ecf8b98172d4255a3affe4970e11f39"><h4 class="sectiontitle">enable_fast_allocate</h4><p id="EN-US_TOPIC_0000001233883245__a7f4fab7a86b148d9aef376c002c682a8"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_a67cf89f508664cba9af034968fe95953">Parameter description</strong>: Specifies whether the quick allocation switch of the disk space is enabled. This switch can be enabled only in the XFS file system.</p>
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<p id="EN-US_TOPIC_0000001233883245__p1530123020336"><strong id="EN-US_TOPIC_0000001233883245__b944016314234">Type</strong>: SUSET</p>
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<p id="EN-US_TOPIC_0000001233883245__a7bb8d838cdf54e1c9181ca343cfa7ee6"><strong id="EN-US_TOPIC_0000001233883245__b1912007294">Value range</strong>: Boolean</p>
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<ul id="EN-US_TOPIC_0000001233883245__ucc08d334b1724739a3bfd51dc6a7e09f"><li id="EN-US_TOPIC_0000001233883245__l817d5431dcb04db4b9e7338e132c0184"><strong id="EN-US_TOPIC_0000001233883245__b1011430449">on</strong> or <strong id="EN-US_TOPIC_0000001233883245__b1699890854">true</strong> indicates that this function is enabled.</li><li id="EN-US_TOPIC_0000001233883245__l4cfd6d2de4ca404398155d4eb2ba7012"><strong id="EN-US_TOPIC_0000001233883245__b1693717386">off</strong> or <strong id="EN-US_TOPIC_0000001233883245__b305168765">false</strong> indicates that the function is disabled.</li></ul>
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<p id="EN-US_TOPIC_0000001233883245__aee252c6cdd8c443ca3170b51dffe5fe1"><strong id="EN-US_TOPIC_0000001233883245__b2948181912401">Default value</strong>: <strong id="EN-US_TOPIC_0000001233883245__b69504197405">off</strong></p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001233883245__s385ba4b4603140c8865930209a62c6a3"><h4 class="sectiontitle">prefetch_quantity</h4><p id="EN-US_TOPIC_0000001233883245__a3137eebb37404e9a93bf1248947bffd4"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_en-us_topic_0058967784_b25941690">Parameter description</strong>: Specifies the number of row-store prefetches using the ADIO.</p>
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<p id="EN-US_TOPIC_0000001233883245__p128281733143419"><strong id="EN-US_TOPIC_0000001233883245__b312917612310">Type</strong>: USERSET</p>
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<p id="EN-US_TOPIC_0000001233883245__aa8bf52050e2048fea295b855430d5ea7"><strong id="EN-US_TOPIC_0000001233883245__b29791968172314">Value range</strong>: an integer ranging from 1024 to 1048576. The unit is 8 KB.</p>
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<p id="EN-US_TOPIC_0000001233883245__a14b53d78e1d3404e9b2a0383a9f1eec5"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0058967784_b4034845193810_1">Default value</strong>: <strong id="EN-US_TOPIC_0000001233883245__b842352706112720">32 MB</strong></p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001233883245__sbc8ec9ebcfc640e2a24ff43fc1ff4be7"><h4 class="sectiontitle">backwrite_quantity</h4><p id="EN-US_TOPIC_0000001233883245__a4dd1e597e8684e7ca3387b3e3a71cb71"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_aa98c8bbf28c448d78d2b47b1fd570b5a">Parameter description</strong>: Specifies the number of row-store writes using the ADIO.</p>
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<p id="EN-US_TOPIC_0000001233883245__p148301157353"><strong id="EN-US_TOPIC_0000001233883245__b125886611238">Type</strong>: USERSET</p>
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<p id="EN-US_TOPIC_0000001233883245__a8e81cc6071ae46c4b165bf1deef05441"><strong id="EN-US_TOPIC_0000001233883245__b54663584615">Value range</strong>: an integer ranging from 1024 to 1048576. The unit is 8 KB.</p>
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<p id="EN-US_TOPIC_0000001233883245__a398a5ad4ec764503b1dc1f1d314a09cd"><strong id="EN-US_TOPIC_0000001233883245__b5735075_1">Default value</strong>: <strong id="EN-US_TOPIC_0000001233883245__b842352706103633">8MB</strong></p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001233883245__s5c15fa7d33a7478587eb5f1a2c3f2e21"><h4 class="sectiontitle">cstore_prefetch_quantity</h4><p id="EN-US_TOPIC_0000001233883245__a21c2b1bdeaf249f8a2be884d5491735b"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_a48280c27c53a4ec295287d3f3dbc767d">Parameter description</strong>: Specifies the number of column-store prefetches using the ADIO.</p>
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<p id="EN-US_TOPIC_0000001233883245__p88871315143515"><strong id="EN-US_TOPIC_0000001233883245__b133345752317">Type</strong>: USERSET</p>
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<p id="EN-US_TOPIC_0000001233883245__a6373ef9464884807b18fccb0b7eaf7a0"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0085033176_en-us_topic_0059778686_a8791c882938f4e6c9ae407641e405449">Value range</strong>: an integer. The value range is from 1024 to 1048576 and the unit is KB.</p>
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<p id="EN-US_TOPIC_0000001233883245__a3f3557b6481c4a67a263967a0f3a4602"><strong id="EN-US_TOPIC_0000001233883245__b1399475359">Default value</strong>: <strong id="EN-US_TOPIC_0000001233883245__b1493201627">32 MB</strong></p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001233883245__sa690f9f51849458e982e1a6ca69363c0"><h4 class="sectiontitle">cstore_backwrite_quantity</h4><p id="EN-US_TOPIC_0000001233883245__acc6e3528a50c4a8ba2635f243d4eaec2"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_af13e9353c4b74526b9074a68685f3522">Parameter description</strong>: Specifies the number of column-store writes using the ADIO.</p>
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<p id="EN-US_TOPIC_0000001233883245__p118301124163513"><strong id="EN-US_TOPIC_0000001233883245__b7797147112316">Type</strong>: USERSET</p>
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<p id="EN-US_TOPIC_0000001233883245__a6451f48b5b86414991a3be333ef389f8"><strong id="EN-US_TOPIC_0000001233883245__b1533792604">Value range</strong>: an integer. The value range is from 1024 to 1048576 and the unit is KB.</p>
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<p id="EN-US_TOPIC_0000001233883245__a975801a4554442e4b3a429659c793f9a"><strong id="EN-US_TOPIC_0000001233883245__b1973814059">Default value</strong>: <strong id="EN-US_TOPIC_0000001233883245__b1161217002">8MB</strong></p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001233883245__seaab60884f1c414aac0196dfdb4cb0c6"><h4 class="sectiontitle">cstore_backwrite_max_threshold</h4><p id="EN-US_TOPIC_0000001233883245__a487d757da470400ea5de3cf6c8397eea"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_a9ba629bc662648429ce76d1cb6fa9123">Parameter description</strong>: Specifies the maximum number of column-store writes buffered in the database using the ADIO.</p>
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<p id="EN-US_TOPIC_0000001233883245__p14479935143513"><strong id="EN-US_TOPIC_0000001233883245__b5158813231">Type</strong>: USERSET</p>
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<p id="EN-US_TOPIC_0000001233883245__a989d8c501ed44edea2d2a688b9eecf3a"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0085033176_en-us_topic_0059778686_a12aff2b535754af2851176a2e69ea575">Value range</strong>: An integer. The value range is from 4096 to INT_MAX/2 and the unit is KB.</p>
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<p id="EN-US_TOPIC_0000001233883245__a2f1f5eb35f1746bfaf47647c5cc73379"><strong id="EN-US_TOPIC_0000001233883245__b573446154754">Default value</strong>: <strong id="EN-US_TOPIC_0000001233883245__b84235270617188">2 GB</strong></p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001233883245__s049e3eefe5b74beb8961d1e4d0326faa"><h4 class="sectiontitle">fast_extend_file_size</h4><p id="EN-US_TOPIC_0000001233883245__afbe602f900f7466cb0ca05afd855a642"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_aacfa07a1399f49838e7aa89be9732d1b">Parameter description</strong>: Specifies the disk size that the row-store pre-scales using the ADIO.</p>
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<p id="EN-US_TOPIC_0000001233883245__p19440346153516"><strong id="EN-US_TOPIC_0000001233883245__b11199128132310">Type</strong>: SUSET</p>
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<p id="EN-US_TOPIC_0000001233883245__aff6cae05dfe14535804cc63bd4f48f03"><strong id="EN-US_TOPIC_0000001233883245__b608271154">Value range</strong>: an integer. The value range is from 1024 to 1048576 and the unit is KB.</p>
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<p id="EN-US_TOPIC_0000001233883245__a5b5978c2ead44ffb80d1eba6edb4131f"><strong id="EN-US_TOPIC_0000001233883245__b1445038871">Default value</strong>: <strong id="EN-US_TOPIC_0000001233883245__b1914425392">8MB</strong></p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001233883245__sb1e39f7916124015a9460f0c46dd9ab5"><h4 class="sectiontitle">effective_io_concurrency</h4><p id="EN-US_TOPIC_0000001233883245__a6f9c59ea3f094f1c885c8fa4753d53b3"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_b57302975171119">Parameter description</strong>: Specifies the number of requests that can be simultaneously processed by the disk subsystem. For the RAID array, the parameter value must be the number of disk drive spindles in the array.</p>
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<p id="EN-US_TOPIC_0000001233883245__p18215142243619"><strong id="EN-US_TOPIC_0000001233883245__b4407186239">Type</strong>: USERSET</p>
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<p id="EN-US_TOPIC_0000001233883245__a98e50d2bf7c047bda60ddd93648b04a8"><strong id="EN-US_TOPIC_0000001233883245__en-us_topic_0059778686_b48212676171119">Value range</strong>: an integer ranging from 0 to 1000</p>
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<p id="EN-US_TOPIC_0000001233883245__a76461f6ed1514058ae84275849c3991f"><strong id="EN-US_TOPIC_0000001233883245__b3158552610564">Default value</strong>: <strong id="EN-US_TOPIC_0000001233883245__b842352706173228">1</strong></p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_04_0892.html">Resource Consumption</a></div>
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</div>
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</div>
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