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<div class="section" id="grndb">
<h1><span class="section-number">7.1.1. </span><code class="docutils literal notranslate"><span class="pre">grndb</span></code><a class="headerlink" href="#grndb" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.1.1.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified added">New in version 4.0.9.</span></p>
</div>
<p><code class="docutils literal notranslate"><span class="pre">grndb</span></code> manages a Groonga database.</p>
<p>Here are features:</p>
<blockquote>
<div><ul class="simple">
<li><p>Checks whether database is broken or not.</p></li>
<li><p>Recovers broken database automatically if the database is
recoverable.</p></li>
</ul>
</div></blockquote>
</div>
<div class="section" id="syntax">
<h2><span class="section-number">7.1.1.2. </span>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">grndb</span></code> requires command and database path:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>grndb COMMAND [OPTIONS] DATABASE_PATH
</pre></div>
</div>
<p>Here are available commands:</p>
<blockquote>
<div><ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">check</span></code> - Checks whether database is broken or not.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">recover</span></code> - Recovers database.</p></li>
</ul>
</div></blockquote>
</div>
<div class="section" id="usage">
<h2><span class="section-number">7.1.1.3. </span>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>Here is an example to check the database at <code class="docutils literal notranslate"><span class="pre">/var/lib/groonga/db/db</span></code>:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb check /var/lib/groonga/db/db
</pre></div>
</div>
<p>Here is an example to recover the database at <code class="docutils literal notranslate"><span class="pre">/var/lib/groonga/db/db</span></code>:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb recover /var/lib/groonga/db/db
</pre></div>
</div>
</div>
<div class="section" id="commands">
<h2><span class="section-number">7.1.1.4. </span>Commands<a class="headerlink" href="#commands" title="Permalink to this headline">¶</a></h2>
<p>This section describes available commands.</p>
<div class="section" id="check">
<h3><span class="section-number">7.1.1.4.1. </span><code class="docutils literal notranslate"><span class="pre">check</span></code><a class="headerlink" href="#check" title="Permalink to this headline">¶</a></h3>
<p>It checks an existing Groonga database. If the database is broken,
<code class="docutils literal notranslate"><span class="pre">grndb</span></code> reports reasons and exits with non-<code class="docutils literal notranslate"><span class="pre">0</span></code> exit status.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>You must not use this command for opened database. If the database
is opened, this command may report wrong result.</p>
</div>
<p><code class="docutils literal notranslate"><span class="pre">check</span></code> has some options.</p>
<div class="section" id="target">
<h4><span class="section-number">7.1.1.4.1.1. </span><code class="docutils literal notranslate"><span class="pre">--target</span></code><a class="headerlink" href="#target" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 5.1.2.</span></p>
</div>
<p>It specifies a check target object.</p>
<p>If your database is large and you know an unreliable object, this
option will help you. <code class="docutils literal notranslate"><span class="pre">check</span></code> need more time for large database. You
can reduce check time by <code class="docutils literal notranslate"><span class="pre">--target</span></code> option to reduce check target.</p>
<p>The check target is checked recursive. Because related objects of
unreliable object will be unreliable.</p>
<p>If the check target is a table, all columns of the table are also
checked recursive.</p>
<p>If the check target is a table and its key type is another table, the
another table is also checked recursive.</p>
<p>If the check target is a column and its value type is a table, the
table is also checked recursive.</p>
<p>If the check target is an index column, the table specified as value
type and all sources are also checked recursive.</p>
<p>Here is an example that checks only <code class="docutils literal notranslate"><span class="pre">Entries</span></code> table and its
columns:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb check --target Entries /var/lib/groonga/db/db
</pre></div>
</div>
<p>Here is an example that checks only <code class="docutils literal notranslate"><span class="pre">Entries.name</span></code> column:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb check --target Entries.name /var/lib/groonga/db/db
</pre></div>
</div>
</div>
<div class="section" id="log-level">
<h4><span class="section-number">7.1.1.4.1.2. </span><code class="docutils literal notranslate"><span class="pre">--log-level</span></code><a class="headerlink" href="#log-level" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 7.0.4.</span></p>
</div>
<p>It specifies a log level of <code class="docutils literal notranslate"><span class="pre">grndb</span></code> log.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--log-level</span></code> option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb check --log-level info --log-path /var/log/groonga/grndb.log /var/lib/groonga/db/db
</pre></div>
</div>
<p>See <a class="reference internal" href="../commands/log_level.html"><span class="doc">log_level</span></a> to know about supported log level.</p>
</div>
<div class="section" id="log-path">
<h4><span class="section-number">7.1.1.4.1.3. </span><code class="docutils literal notranslate"><span class="pre">--log-path</span></code><a class="headerlink" href="#log-path" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 7.0.4.</span></p>
</div>
<p>It specifies a path of <code class="docutils literal notranslate"><span class="pre">grndb</span></code> log.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--log-path</span></code> option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb check --log-path /var/log/groonga/grndb.log /var/lib/groonga/db/db
</pre></div>
</div>
</div>
<div class="section" id="log-flags">
<h4><span class="section-number">7.1.1.4.1.4. </span><code class="docutils literal notranslate"><span class="pre">--log-flags</span></code><a class="headerlink" href="#log-flags" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 9.0.3.</span></p>
</div>
<p>It specifies a logged content in <code class="docutils literal notranslate"><span class="pre">grndb</span></code> log by flags.
The default value of <code class="docutils literal notranslate"><span class="pre">--log-flags</span></code> is <code class="docutils literal notranslate"><span class="pre">time|message</span></code>. It means that timestamp and log messages are logged into <code class="docutils literal notranslate"><span class="pre">grndb</span></code> log.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--log-flags</span></code> option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb check --log-path /var/log/groonga/grndb.log --log-flags "time|pid|message" /var/lib/groonga/db/db
</pre></div>
</div>
<p>See <a class="reference internal" href="groonga.html"><span class="doc">groonga executable file</span></a> to know about supported log flags.</p>
</div>
<div class="section" id="since">
<h4><span class="section-number">7.1.1.4.1.5. </span><code class="docutils literal notranslate"><span class="pre">--since</span></code><a class="headerlink" href="#since" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 9.0.4.</span></p>
</div>
<p>It specifies the object’s modified time which should be checked. If object’s modified time is newer than the specified time, these objects are checked by <code class="docutils literal notranslate"><span class="pre">grndb</span></code>.
You can specify the modified time as ISO 8601 format or <code class="docutils literal notranslate"><span class="pre">-NUNIT</span></code> format such as -3days or -2.5weeks format.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--since</span></code> option in ISO 8601 format:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grmdb check --since=2019-06-24T18:16:22 /var/lib/groonga/db/db
</pre></div>
</div>
<p>In above example, the objects which are modified after <code class="docutils literal notranslate"><span class="pre">2019-06-24T18:16:22</span></code> are checked.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--since</span></code> option in <code class="docutils literal notranslate"><span class="pre">-NUNIT</span></code> format:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grmdb check --since=-7d /var/lib/groonga/db/db
</pre></div>
</div>
<p>In above example, the objects which are modified in recent 7 days are checked.</p>
<p><code class="docutils literal notranslate"><span class="pre">-NUNIT</span></code> accepts the following suffix as a unit.</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 50%" />
<col style="width: 50%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Supported suffix</p></th>
<th class="head"><p>Description</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">s</span></code>, <code class="docutils literal notranslate"><span class="pre">sec</span></code>, <code class="docutils literal notranslate"><span class="pre">secs</span></code>, <code class="docutils literal notranslate"><span class="pre">second</span></code>, <code class="docutils literal notranslate"><span class="pre">seconds</span></code></p></td>
<td><p>Specify recent N seconds. For example, <code class="docutils literal notranslate"><span class="pre">--since=-100s</span></code> means within recent 100 seconds should be checked.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">m</span></code>, <code class="docutils literal notranslate"><span class="pre">min</span></code>, <code class="docutils literal notranslate"><span class="pre">mins</span></code>, <code class="docutils literal notranslate"><span class="pre">minute</span></code>, <code class="docutils literal notranslate"><span class="pre">minutes</span></code></p></td>
<td><p>Specify recent N minutes. For example, <code class="docutils literal notranslate"><span class="pre">--since=-10m</span></code> means within recent 10 minutes should be checked.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">h</span></code>, <code class="docutils literal notranslate"><span class="pre">hour</span></code>, <code class="docutils literal notranslate"><span class="pre">hours</span></code></p></td>
<td><p>Specify recent N hours. For example, <code class="docutils literal notranslate"><span class="pre">--since=-10h</span></code> means within recent 10 hours should be checked.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">d</span></code>, <code class="docutils literal notranslate"><span class="pre">day</span></code>, <code class="docutils literal notranslate"><span class="pre">days</span></code></p></td>
<td><p>Specify recent N days. For example, <code class="docutils literal notranslate"><span class="pre">--since=-10d</span></code> means within recent 10 days should be checked.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">w</span></code>, <code class="docutils literal notranslate"><span class="pre">week</span></code>, <code class="docutils literal notranslate"><span class="pre">weeks</span></code></p></td>
<td><p>Specify recent N weeks. For example, <code class="docutils literal notranslate"><span class="pre">--since=-10w</span></code> means within recent 10 weeks should be checked.</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">month</span></code>, <code class="docutils literal notranslate"><span class="pre">months</span></code></p></td>
<td><p>Specify recent N months. For example, <code class="docutils literal notranslate"><span class="pre">--since=-10month</span></code> means within recent 10 months should be checked.</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">year</span></code>, <code class="docutils literal notranslate"><span class="pre">years</span></code></p></td>
<td><p>Specify recent N years. For example, <code class="docutils literal notranslate"><span class="pre">--since=-1year</span></code> means within recent 1 year should be checked.</p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="section" id="recover">
<h3><span class="section-number">7.1.1.4.2. </span><code class="docutils literal notranslate"><span class="pre">recover</span></code><a class="headerlink" href="#recover" title="Permalink to this headline">¶</a></h3>
<p>It recovers an existing broken Groonga database.</p>
<p>If the database is not broken, <code class="docutils literal notranslate"><span class="pre">grndb</span></code> does nothing and exits with
<code class="docutils literal notranslate"><span class="pre">0</span></code> exit status.</p>
<p>If the database is broken and one or more index columns are only
broken, <code class="docutils literal notranslate"><span class="pre">grndb</span></code> recovers these index columns and exists with <code class="docutils literal notranslate"><span class="pre">0</span></code>
exit status. It may take a long time for large indexed data.</p>
<p>If the database is broken and tables or data columns are broken,
<code class="docutils literal notranslate"><span class="pre">grndb</span></code> reports broken reasons and exits with non-<code class="docutils literal notranslate"><span class="pre">0</span></code> exit
status. You can know whether the database is recoverable or not by
<code class="docutils literal notranslate"><span class="pre">check</span></code> command.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>You must not use this command for opened database. If the database
is opened, this command may break the database.</p>
</div>
<p><code class="docutils literal notranslate"><span class="pre">recover</span></code> has some options.</p>
<div class="section" id="force-truncate">
<span id="grndb-force-truncate"></span><h4><span class="section-number">7.1.1.4.2.1. </span><code class="docutils literal notranslate"><span class="pre">--force-truncate</span></code><a class="headerlink" href="#force-truncate" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 7.0.4.</span></p>
</div>
<p>It forces to truncate a corrupted database object.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--force-truncate</span></code> option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb recover --force-truncate --log-level info --log-path /var/log/groonga/grndb.log /var/lib/groonga/db/db
</pre></div>
</div>
<p>When this option is specified, <code class="docutils literal notranslate"><span class="pre">grndb</span></code> does the followings:</p>
<ul class="simple">
<li><p>check whether there is a corrupted database object (table, column, indexes)</p></li>
<li><p>truncate a corrupted database object (table, column, indexes)</p></li>
<li><p>remove incremental files with .00N suffix which is created when large amount of data is loaded</p></li>
</ul>
<p><code class="docutils literal notranslate"><span class="pre">--force-truncate</span></code> option is destructive one. Even though lock is still remained, <code class="docutils literal notranslate"><span class="pre">grndb</span></code> truncates a targeted corrupted database object.</p>
<p>After <code class="docutils literal notranslate"><span class="pre">grndb</span> <span class="pre">recover</span></code> command has finished, you need to load data
against truncated tables or columns to recreate database.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>You must use this option only when necessary. It means that you use it when there is a mismatch between database meta information and database object files which exists actually. This options should be used when there is no other way to recover database.</p>
</div>
</div>
<div class="section" id="force-lock-clear">
<span id="grndb-force-lock-clear"></span><h4><span class="section-number">7.1.1.4.2.2. </span><code class="docutils literal notranslate"><span class="pre">--force-lock-clear</span></code><a class="headerlink" href="#force-lock-clear" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 7.1.1.</span></p>
</div>
<p>It forces to clear lock of database, table and data column. It doesn’t
clear lock of index column. If index column has lock, the index column
is recreated instead of clearing lock.</p>
<p>Normally, you should truncate and load data again instead of just
clearing lock. Because objects that have lock may be broken. This
option is provided only for users who know the risk that “the database
may be broken but I want to keep using it”.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--force-lock-clear</span></code> option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb recover --force-lock-clear --log-level info --log-path /var/log/groonga/grndb.log /var/lib/groonga/db/db
</pre></div>
</div>
<p>When this option is specified, <code class="docutils literal notranslate"><span class="pre">grndb</span></code> does the followings:</p>
<ul class="simple">
<li><p>check whether there are database, table or data column that have lock</p></li>
<li><p>clear lock of these objects</p></li>
</ul>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>You must use this option only when necessary. Because your database
may not be recovered. The database that has objects that have lock
may be broken or not be broken. You can keep using the database but
Groonga may crash if the database is broken.</p>
</div>
</div>
<div class="section" id="id1">
<h4><span class="section-number">7.1.1.4.2.3. </span><code class="docutils literal notranslate"><span class="pre">--log-level</span></code><a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 7.0.4.</span></p>
</div>
<p>It specifies a log level of <code class="docutils literal notranslate"><span class="pre">grndb</span></code> log.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--log-level</span></code> option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb recover --log-level info --log-path /var/log/groonga/grndb.log /var/lib/groonga/db/db
</pre></div>
</div>
<p>See <a class="reference internal" href="../commands/log_level.html"><span class="doc">log_level</span></a> to know about supported log level.</p>
</div>
<div class="section" id="id2">
<h4><span class="section-number">7.1.1.4.2.4. </span><code class="docutils literal notranslate"><span class="pre">--log-path</span></code><a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 7.0.4.</span></p>
</div>
<p>It specifies a path of <code class="docutils literal notranslate"><span class="pre">grndb</span></code> log.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--log-path</span></code> option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb recover --log-path /var/log/groonga/grndb.log /var/lib/groonga/db/db
</pre></div>
</div>
</div>
<div class="section" id="id3">
<h4><span class="section-number">7.1.1.4.2.5. </span><code class="docutils literal notranslate"><span class="pre">--log-flags</span></code><a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 9.0.2.</span></p>
</div>
<p>It specifies a logged content in <code class="docutils literal notranslate"><span class="pre">grndb</span></code> log by flags.
The default value of <code class="docutils literal notranslate"><span class="pre">--log-flags</span></code> is <code class="docutils literal notranslate"><span class="pre">time|message</span></code>. It means that timestamp and log messages are logged into <code class="docutils literal notranslate"><span class="pre">grndb</span></code> log.</p>
<p>Here is an example that specifies <code class="docutils literal notranslate"><span class="pre">--log-flags</span></code> option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>% grndb check --log-path /var/log/groonga/grndb.log --log-flags "time|pid|message" /var/lib/groonga/db/db
</pre></div>
</div>
<p>See <a class="reference internal" href="groonga.html"><span class="doc">groonga executable file</span></a> to know about supported log flags.</p>
</div>
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<h3><a href="../../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.1.1. <code class="docutils literal notranslate"><span class="pre">grndb</span></code></a><ul>
<li><a class="reference internal" href="#summary">7.1.1.1. Summary</a></li>
<li><a class="reference internal" href="#syntax">7.1.1.2. Syntax</a></li>
<li><a class="reference internal" href="#usage">7.1.1.3. Usage</a></li>
<li><a class="reference internal" href="#commands">7.1.1.4. Commands</a><ul>
<li><a class="reference internal" href="#check">7.1.1.4.1. <code class="docutils literal notranslate"><span class="pre">check</span></code></a><ul>
<li><a class="reference internal" href="#target">7.1.1.4.1.1. <code class="docutils literal notranslate"><span class="pre">--target</span></code></a></li>
<li><a class="reference internal" href="#log-level">7.1.1.4.1.2. <code class="docutils literal notranslate"><span class="pre">--log-level</span></code></a></li>
<li><a class="reference internal" href="#log-path">7.1.1.4.1.3. <code class="docutils literal notranslate"><span class="pre">--log-path</span></code></a></li>
<li><a class="reference internal" href="#log-flags">7.1.1.4.1.4. <code class="docutils literal notranslate"><span class="pre">--log-flags</span></code></a></li>
<li><a class="reference internal" href="#since">7.1.1.4.1.5. <code class="docutils literal notranslate"><span class="pre">--since</span></code></a></li>
</ul>
</li>
<li><a class="reference internal" href="#recover">7.1.1.4.2. <code class="docutils literal notranslate"><span class="pre">recover</span></code></a><ul>
<li><a class="reference internal" href="#force-truncate">7.1.1.4.2.1. <code class="docutils literal notranslate"><span class="pre">--force-truncate</span></code></a></li>
<li><a class="reference internal" href="#force-lock-clear">7.1.1.4.2.2. <code class="docutils literal notranslate"><span class="pre">--force-lock-clear</span></code></a></li>
<li><a class="reference internal" href="#id1">7.1.1.4.2.3. <code class="docutils literal notranslate"><span class="pre">--log-level</span></code></a></li>
<li><a class="reference internal" href="#id2">7.1.1.4.2.4. <code class="docutils literal notranslate"><span class="pre">--log-path</span></code></a></li>
<li><a class="reference internal" href="#id3">7.1.1.4.2.5. <code class="docutils literal notranslate"><span class="pre">--log-flags</span></code></a></li>
</ul>
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