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15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>About 2 min</span><meta property="timeRequired" content="PT2M"></span><!----><!----></div><hr></div><div class="vp-toc-placeholder"><aside id="toc"><!--[--><!----><!--]--><div class="vp-toc-header">On This Page<button type="button" class="print-button" title="Print"><svg xmlns="http://www.w3.org/2000/svg" class="icon print-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="print icon"><path d="M819.2 364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button><div class="arrow end"></div></div><div class="vp-toc-wrapper"><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#partition-slots">Partition Slots</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#sequence-partition-slots">Sequence Partition Slots</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#time-partition-slots">Time Partition Slots</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#metadata-partitioning">Metadata Partitioning</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#data-partitioning">Data Partitioning</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#load-balancing">Load Balancing</a></li><!----><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h1 id="data-partitioning-load-balancing" tabindex="-1"><a class="header-anchor" href="#data-partitioning-load-balancing"><span>Data Partitioning &amp; Load Balancing</span></a></h1><p>IoTDB manages metadata and data based on data partitions (DataRegion), dividing the data from both the sequence and time dimensions.</p><img style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;" src="https://alioss.timecho.com/docs/img/分区槽与数据分区.png?raw=true"><h2 id="partition-slots" tabindex="-1"><a class="header-anchor" href="#partition-slots"><span>Partition Slots</span></a></h2><p>A sequence partition slot combined with a time partition slot can generate a data partition (when the sequence slot has corresponding data under that time slot).</p><img style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;" src="https://alioss.timecho.com/docs/img/SeriesPartitionSlot.png?raw=true"><h3 id="sequence-partition-slots" tabindex="-1"><a class="header-anchor" href="#sequence-partition-slots"><span>Sequence Partition Slots</span></a></h3><p>Each database holds a fixed number of sequence partition slots, with the default set to 1000. Every time series managed by the database is allocated to a unique sequence partition slot using a partitioning algorithm (usually some hash method).</p><h3 id="time-partition-slots" tabindex="-1"><a class="header-anchor" href="#time-partition-slots"><span>Time Partition Slots</span></a></h3><p>Every time series will continuously produce data. If all the data from a time series is stored on one node continuously, the newly added DataNode in the cluster might not be effectively utilized.</p><p>Time partition slots slice the time-series data from the time dimension (typically, one time partition per day), making the time-series data storage in the cluster easy to manage.</p><h2 id="metadata-partitioning" tabindex="-1"><a class="header-anchor" href="#metadata-partitioning"><span>Metadata Partitioning</span></a></h2><p>The metadata partition management of a single database, following a specific load balancing strategy, assigns all sequence slots to the corresponding SchemaRegionGroup, further horizontally scaling within the cluster.</p><img style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;" src="https://alioss.timecho.com/docs/img/SchemaRegion.png?raw=true"><h2 id="data-partitioning" tabindex="-1"><a class="header-anchor" href="#data-partitioning"><span>Data Partitioning</span></a></h2><p>It follows a certain load balancing strategy, dividing time and sequence partition slots, and allocating them to the relevant DataRegionGroup, further allowing horizontal scaling in the cluster.</p><img style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;" src="https://alioss.timecho.com/docs/img/DataRegion.png?raw=true"><h2 id="load-balancing" tabindex="-1"><a class="header-anchor" href="#load-balancing"><span>Load Balancing</span></a></h2><p>When the cluster&#39;s capacity remains unchanged, data will be evenly distributed across all nodes to utilize storage and computational resources effectively.</p><p>Also, during cluster expansion, the system automatically increases the number of regions to fully exploit the computational resources of all nodes without manual intervention. 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