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| --><blockquote><p>Here are all files generated or used by IoTDB</p><p>Continuously Updating...</p></blockquote><h1 id="stand-alone" tabindex="-1"><a class="header-anchor" href="#stand-alone" aria-hidden="true">#</a> Stand-alone</h1><h2 id="configuration-files" tabindex="-1"><a class="header-anchor" href="#configuration-files" aria-hidden="true">#</a> Configuration Files</h2><blockquote><p>under conf directory</p></blockquote><ol><li>iotdb-datanode.properties</li><li>logback.xml</li><li><a href="http://datanode-env.sh" target="_blank" rel="noopener noreferrer">datanode-env.sh<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a></li><li>jmx.access</li><li>jmx.password</li><li>iotdb-sync-client.properties <ul><li>only sync tool use it</li></ul></li></ol><blockquote><p>under directory basedir/system/schema</p></blockquote><ol><li>system.properties <ul><li>record all immutable properties, will be checked when starting IoTDB to avoid system errors</li></ul></li></ol><h2 id="state-related-files" tabindex="-1"><a class="header-anchor" href="#state-related-files" aria-hidden="true">#</a> State Related Files</h2><h3 id="metadata-related-files" tabindex="-1"><a class="header-anchor" href="#metadata-related-files" aria-hidden="true">#</a> MetaData Related Files</h3><blockquote><p>under directory basedir/system/schema</p></blockquote><h4 id="meta" tabindex="-1"><a class="header-anchor" href="#meta" aria-hidden="true">#</a> Meta</h4><ol><li>mlog.bin <ul><li>record the meta operation</li></ul></li><li>mtree-1.snapshot <ul><li>snapshot of metadata</li></ul></li><li>mtree-1.snapshot.tmp <ul><li>temp file, to avoid damaging the snapshot when updating it</li></ul></li></ol><h4 id="tags-attributes" tabindex="-1"><a class="header-anchor" href="#tags-attributes" aria-hidden="true">#</a> Tags&Attributes</h4><ol><li>tlog.txt <ul><li>store tags and attributes of each TimeSeries</li><li>about 700 bytes for each TimeSeries</li></ul></li></ol><h3 id="data-related-files" tabindex="-1"><a class="header-anchor" href="#data-related-files" aria-hidden="true">#</a> Data Related Files</h3><blockquote><p>under directory basedir/data/</p></blockquote><h4 id="wal" tabindex="-1"><a class="header-anchor" href="#wal" aria-hidden="true">#</a> WAL</h4><blockquote><p>under directory basedir/wal</p></blockquote><ol><li>{StorageGroupName}-{TsFileName}/wal1 <ul><li>every database has several wal files, and every memtable has one associated wal file before it is flushed into a TsFile</li></ul></li></ol><h4 id="tsfile" tabindex="-1"><a class="header-anchor" href="#tsfile" aria-hidden="true">#</a> TsFile</h4><blockquote><p>under directory data/sequence or unsequence/{DatabaseName}/{DataRegionId}/{TimePartitionId}/</p></blockquote><ol><li>{time}-{version}-{mergeCnt}.tsfile <ul><li>normal data file</li></ul></li><li>{TsFileName}.tsfile.mod <ul><li>modification file</li><li>record delete operation</li></ul></li></ol><h4 id="tsfileresource" tabindex="-1"><a class="header-anchor" href="#tsfileresource" aria-hidden="true">#</a> TsFileResource</h4><ol><li>{TsFileName}.tsfile.resource <ul><li>descriptor and statistic file of a TsFile</li></ul></li><li>{TsFileName}.tsfile.resource.temp <ul><li>temp file</li><li>avoid damaging the tsfile.resource when updating it</li></ul></li><li>{TsFileName}.tsfile.resource.closing <ul><li>close flag file, to mark a tsfile closing so during restarts we can continue to close it or reopen it</li></ul></li></ol><h4 id="version" tabindex="-1"><a class="header-anchor" href="#version" aria-hidden="true">#</a> Version</h4><blockquote><p>under directory basedir/system/databases/{DatabaseName}/{DataRegionId}/{TimePartitionId} or upgrade</p></blockquote><ol><li version="">Version- <ul><li>version file, record the max version in fileName of a database</li></ul></li></ol><h4 id="upgrade" tabindex="-1"><a class="header-anchor" href="#upgrade" aria-hidden="true">#</a> Upgrade</h4><blockquote><p>under directory basedir/system/upgrade</p></blockquote><ol><li>upgrade.txt <ul><li>record which files have been upgraded</li></ul></li></ol><h4 id="merge" tabindex="-1"><a class="header-anchor" href="#merge" aria-hidden="true">#</a> Merge</h4><blockquote><p>under directory basedir/system/databases/{StorageGroup}/</p></blockquote><ol><li>merge.mods <ul><li>modification file generated during a merge</li></ul></li><li>merge.log <ul><li>record the progress of a merge</li></ul></li><li>tsfile.merge <ul><li>temporary merge result file, an involved sequence tsfile may have one during a merge</li></ul></li></ol><h4 id="authority" tabindex="-1"><a class="header-anchor" href="#authority" aria-hidden="true">#</a> Authority</h4><blockquote><p>under directory basedir/system/users/ under directory basedir/system/roles/</p></blockquote><h4 id="compressratio" tabindex="-1"><a class="header-anchor" href="#compressratio" aria-hidden="true">#</a> CompressRatio</h4><blockquote><p>under directory basedir/system/compression_ration</p></blockquote><ol><li calTimes="">Ration-{compressionRatioSum}- <ul><li>record compression ratio of each tsfile</li></ul></li></ol></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb/edit/master/docs/UserGuide/QuickStart/ServerFileList.md" rel="noopener noreferrer" target="_blank" aria-label="Found Error? 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