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--><h1 id="time-partition" tabindex="-1"><a class="header-anchor" href="#time-partition" aria-hidden="true">#</a> Time partition</h1><h2 id="features" tabindex="-1"><a class="header-anchor" href="#features" aria-hidden="true">#</a> Features</h2><p>Time partition divides data according to time, and a time partition is used to save all data within a certain time range. The time partition number is represented by a natural number. Number 0 means January 1, 1970, it will increase by one every partition_interval milliseconds. Time partition number&#39;s calculation formula is timestamp / partition_interval. The main configuration items are as follows:</p><ul><li>time_partition_interval</li></ul><table><thead><tr><th style="text-align:center;">Name</th><th style="text-align:left;">time_partition_interval</th></tr></thead><tbody><tr><td style="text-align:center;">Description</td><td style="text-align:left;">Time range for dividing database, time series data will be divided into groups by this time range</td></tr><tr><td style="text-align:center;">Type</td><td style="text-align:left;">Int64</td></tr><tr><td style="text-align:center;">Default</td><td style="text-align:left;">604800000</td></tr><tr><td style="text-align:center;">Effective</td><td style="text-align:left;">Only allowed to be modified in first start up</td></tr></tbody></table><h2 id="configuration-example" tabindex="-1"><a class="header-anchor" href="#configuration-example" aria-hidden="true">#</a> Configuration example</h2><p>Enable time partition and set partition_interval to 86400000 (one day), then the data distribution is shown as the following figure:</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/UserGuide/Data-Concept/Time-Partition/time_partition_example.png" alt="time partition example"><ul><li><p>Insert one datapoint with timestamp 0, calculate 0/86400000 = 0, then this datapoint will be stored in TsFile under folder 0</p></li><li><p>Insert one datapoint with timestamp 1609459200010, calculate 1609459200010/86400000 = 18628, then this datapoint will be stored in TsFile under folder 18628</p></li></ul><h2 id="suggestions" tabindex="-1"><a class="header-anchor" href="#suggestions" aria-hidden="true">#</a> Suggestions</h2><p>When enabling time partition, it is better to enable timed flush memtable, configuration params are detailed in <a href="/UserGuide/V1.0.x/Reference/DataNode-Config-Manual.html" class="">Config manual for timed flush</a>.</p><ul><li><p>enable_timed_flush_unseq_memtable: Whether to enable timed flush unsequence memtable, enabled by default.</p></li><li><p>enable_timed_flush_seq_memtable: Whether to enable timed flush sequence memtable, disabled by default. It should be enabled when time partition is enabled, so inactive time partition&#39;s memtable can be flushed regularly.</p></li></ul></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb/edit/rel/1.0/docs/UserGuide/Data-Concept/Time-Partition.md" rel="noopener noreferrer" target="_blank" aria-label="Found Error? 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