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<div class="section" id="table-remove">
<h1><span class="section-number">7.3.64. </span><code class="docutils literal notranslate"><span class="pre">table_remove</span></code><a class="headerlink" href="#table-remove" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.3.64.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">table_remove</span></code> removes a table and its columns. If there are one or
more indexes against key of the table and its columns, they are also
removed.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 6.0.1: </span>You can also remove tables and columns that reference the target
table by using <code class="docutils literal notranslate"><span class="pre">dependent</span></code> parameter.</p>
</div>
</div>
<div class="section" id="syntax">
<h2><span class="section-number">7.3.64.2. </span>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<p>This command takes two parameters:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_remove name
[dependent=no]
</pre></div>
</div>
</div>
<div class="section" id="usage">
<span id="table-remove-usage"></span><h2><span class="section-number">7.3.64.3. </span>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>You just specify table name that you want to remove. <code class="docutils literal notranslate"><span class="pre">table_remove</span></code>
removes the table and its columns. If the table and its columns are
indexed, all index columns for the table and its columns are also
removed.</p>
<p>This section describes about the followings:</p>
<blockquote>
<div><ul class="simple">
<li><p>Basic usage</p></li>
<li><p>Unremovable cases</p></li>
<li><p>Removes a table with tables and columns that reference the target table</p></li>
<li><p>Decreases used resources</p></li>
</ul>
</div></blockquote>
<div class="section" id="basic-usage">
<span id="table-remove-basic-usage"></span><h3><span class="section-number">7.3.64.3.1. </span>Basic usage<a class="headerlink" href="#basic-usage" title="Permalink to this headline">¶</a></h3>
<p>Let’s think about the following case:</p>
<blockquote>
<div><ul class="simple">
<li><p>There is one table <code class="docutils literal notranslate"><span class="pre">Entries</span></code>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">Entries</span></code> table has some columns.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">Entries</span></code> table’s key is indexed.</p></li>
<li><p>A column of <code class="docutils literal notranslate"><span class="pre">Entries</span></code> is indexed.</p></li>
</ul>
</div></blockquote>
<p>Here are commands that create <code class="docutils literal notranslate"><span class="pre">Entries</span></code> table:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create Entries TABLE_HASH_KEY UInt32
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Entries title COLUMN_SCALAR ShortText
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Entries content COLUMN_SCALAR Text
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p>Here are commands that create an index for <code class="docutils literal notranslate"><span class="pre">Entries</span></code> table’s key:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create EntryKeys TABLE_HASH_KEY UInt32
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create EntryKeys key_index COLUMN_INDEX Entries _key
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p>Here are commands that create an index for <code class="docutils literal notranslate"><span class="pre">Entries</span></code> table’s column:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create Terms TABLE_PAT_KEY ShortText \
--default_tokenizer TokenBigram \
--normalizer NormalizerAuto
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Terms content_index COLUMN_INDEX Entries content
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p>Let’s confirm the current schema before running <code class="docutils literal notranslate"><span class="pre">table_remove</span></code>:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>dump
# table_create Entries TABLE_HASH_KEY UInt32
# column_create Entries content COLUMN_SCALAR Text
# column_create Entries title COLUMN_SCALAR ShortText
#
# table_create EntryKeys TABLE_HASH_KEY UInt32
#
# table_create Terms TABLE_PAT_KEY ShortText --default_tokenizer TokenBigram --normalizer NormalizerAuto
#
# column_create EntryKeys key_index COLUMN_INDEX Entries _key
# column_create Terms content_index COLUMN_INDEX Entries content
</pre></div>
</div>
<p>If you remove <code class="docutils literal notranslate"><span class="pre">Entries</span></code> table, the following tables and columns are
removed:</p>
<blockquote>
<div><ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">Entries</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">Entries.title</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">Entries.context</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">EntryKeys.key_index</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">Terms.content_index</span></code></p></li>
</ul>
</div></blockquote>
<p>The following tables (lexicons) aren’t removed:</p>
<blockquote>
<div><ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">EntryKeys</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">Terms</span></code></p></li>
</ul>
</div></blockquote>
<p>Let’s run <code class="docutils literal notranslate"><span class="pre">table_remove</span></code>:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_remove Entries
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p>Here is schema after <code class="docutils literal notranslate"><span class="pre">table_remove</span></code>. Only <code class="docutils literal notranslate"><span class="pre">EntryKeys</span></code> and
<code class="docutils literal notranslate"><span class="pre">Terms</span></code> exist:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>dump
# table_create EntryKeys TABLE_HASH_KEY UInt32
#
# table_create Terms TABLE_PAT_KEY ShortText --default_tokenizer TokenBigram --normalizer NormalizerAuto
</pre></div>
</div>
</div>
<div class="section" id="unremovable-cases">
<span id="table-remove-unremovable-cases"></span><h3><span class="section-number">7.3.64.3.2. </span>Unremovable cases<a class="headerlink" href="#unremovable-cases" title="Permalink to this headline">¶</a></h3>
<p>There are some unremovable cases:</p>
<blockquote>
<div><ul class="simple">
<li><p>One or more tables use the table as key type.</p></li>
<li><p>One or more columns use the table as value type.</p></li>
</ul>
</div></blockquote>
<p>Both cases blocks dangling references. If the table is referenced as
type and the table is removed, tables and columns that refer the table
are broken.</p>
<p>If the target table satisfies one of them, <code class="docutils literal notranslate"><span class="pre">table_remove</span></code> is
failed. The target table and its columns aren’t removed.</p>
<p>Here is an example for the table is used as key type case.</p>
<p>The following commands create a table to be removed and a table that
uses the table to be removed as key type:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create ReferencedByTable TABLE_HASH_KEY ShortText
# [[0, 1337566253.89858, 0.000355720520019531], true]
table_create ReferenceTable TABLE_HASH_KEY ReferencedByTable
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">table_remove</span></code> against <code class="docutils literal notranslate"><span class="pre">ReferencedByTable</span></code> is failed:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_remove ReferencedByTable
# [
# [
# -2,
# 1337566253.89858,
# 0.000355720520019531,
# "[table][remove] a table that references the table exists: <ReferenceTable._key> -> <ReferencedByTable>",
# [
# [
# "is_removable_table",
# "db.c",
# 9488
# ]
# ]
# ],
# false
# ]
</pre></div>
</div>
<p>You need to remove <code class="docutils literal notranslate"><span class="pre">ReferenceTable</span></code> before you remove
<code class="docutils literal notranslate"><span class="pre">ReferencedByTable</span></code>:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_remove ReferenceTable
# [[0, 1337566253.89858, 0.000355720520019531], true]
table_remove ReferencedByTable
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p>Here is an example for the table is used as value type case.</p>
<p>The following commands create a table to be removed and a column that
uses the table to be removed as value type:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create ReferencedByColumn TABLE_HASH_KEY ShortText
# [[0, 1337566253.89858, 0.000355720520019531], true]
table_create Table TABLE_NO_KEY
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Table reference_column COLUMN_SCALAR ReferencedByColumn
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">table_remove</span></code> against <code class="docutils literal notranslate"><span class="pre">ReferencedByColumn</span></code> is failed:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_remove ReferencedByColumn
# [
# [
# -2,
# 1337566253.89858,
# 0.000355720520019531,
# "[table][remove] a column that references the table exists: <Table.reference_column> -> <ReferencedByColumn>",
# [
# [
# "is_removable_table",
# "db.c",
# 9494
# ]
# ]
# ],
# false
# ]
</pre></div>
</div>
<p>You need to remove <code class="docutils literal notranslate"><span class="pre">Table.reference_column</span></code> before you remove
<code class="docutils literal notranslate"><span class="pre">ReferencedByColumn</span></code>:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>column_remove Table reference_column
# [[0, 1337566253.89858, 0.000355720520019531], true]
table_remove ReferencedByColumn
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
</div>
<div class="section" id="removes-a-table-with-tables-and-columns-that-reference-the-target-table">
<span id="table-remove-remove-dependents"></span><h3><span class="section-number">7.3.64.3.3. </span>Removes a table with tables and columns that reference the target table<a class="headerlink" href="#removes-a-table-with-tables-and-columns-that-reference-the-target-table" title="Permalink to this headline">¶</a></h3>
<div class="versionadded">
<p><span class="versionmodified added">New in version 6.0.1.</span></p>
</div>
<p>If you understand what you’ll do, you can also remove tables and
columns that reference the target table with one <code class="docutils literal notranslate"><span class="pre">table_remove</span></code>
command by using <code class="docutils literal notranslate"><span class="pre">--dependent</span> <span class="pre">yes</span></code> parameter.</p>
<p><code class="docutils literal notranslate"><span class="pre">ReferencedTable</span></code> in the following schema is referenced from a table
and a column:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create ReferencedTable TABLE_HASH_KEY ShortText
# [[0, 1337566253.89858, 0.000355720520019531], true]
table_create Table1 TABLE_HASH_KEY ReferencedTable
# [[0, 1337566253.89858, 0.000355720520019531], true]
table_create Table2 TABLE_NO_KEY
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Table2 reference_column COLUMN_SCALAR ReferencedTable
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p>You can’t remove <code class="docutils literal notranslate"><span class="pre">ReferencedTable</span></code> by default:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_remove ReferencedTable
# [
# [
# -2,
# 1337566253.89858,
# 0.000355720520019531,
# "[table][remove] a table that references the table exists: <Table1._key> -> <ReferencedTable>",
# [
# [
# "is_removable_table",
# "db.c",
# 9488
# ]
# ]
# ],
# false
# ]
</pre></div>
</div>
<p>You can remove <code class="docutils literal notranslate"><span class="pre">ReferencedTable</span></code>, <code class="docutils literal notranslate"><span class="pre">Table1</span></code> and
<code class="docutils literal notranslate"><span class="pre">Table2.reference_column</span></code> by using <code class="docutils literal notranslate"><span class="pre">--dependent</span> <span class="pre">yes</span></code>
parameter. <code class="docutils literal notranslate"><span class="pre">Table1</span></code> and <code class="docutils literal notranslate"><span class="pre">Table2.reference_column</span></code> reference
<code class="docutils literal notranslate"><span class="pre">ReferencedTable</span></code>:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_remove ReferencedTable --dependent yes
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
</div>
<div class="section" id="decreases-used-resources">
<span id="table-remove-decreases-used-resources"></span><h3><span class="section-number">7.3.64.3.4. </span>Decreases used resources<a class="headerlink" href="#decreases-used-resources" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">table_remove</span></code> opens all tables and columns in database to check
<a class="reference internal" href="#table-remove-unremovable-cases"><span class="std std-ref">Unremovable cases</span></a>.</p>
<p>If you have many tables and columns, <code class="docutils literal notranslate"><span class="pre">table_remove</span></code> may use many
resources. There is a workaround to avoid the case.</p>
<p><code class="docutils literal notranslate"><span class="pre">table_remove</span></code> closes temporary opened tables and columns for
checking when the max number of threads is <code class="docutils literal notranslate"><span class="pre">1</span></code>.</p>
<p>You can confirm and change the current max number of threads by
<a class="reference internal" href="thread_limit.html"><span class="doc">thread_limit</span></a>.</p>
<p>The feature is used in the following case:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create Entries TABLE_NO_KEY
# [[0, 1337566253.89858, 0.000355720520019531], true]
thread_limit 2
# [[0, 1337566253.89858, 0.000355720520019531], 1]
table_remove Entries
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p>The feature isn’t used in the following case:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create Entries TABLE_NO_KEY
# [[0, 1337566253.89858, 0.000355720520019531], true]
thread_limit 2
# [[0, 1337566253.89858, 0.000355720520019531], 1]
table_remove Entries
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
</div>
</div>
<div class="section" id="parameters">
<h2><span class="section-number">7.3.64.4. </span>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
<p>This section describes all parameters.</p>
<div class="section" id="required-parameters">
<h3><span class="section-number">7.3.64.4.1. </span>Required parameters<a class="headerlink" href="#required-parameters" title="Permalink to this headline">¶</a></h3>
<p>There is only one required parameter.</p>
<div class="section" id="name">
<span id="table-remove-name"></span><h4><span class="section-number">7.3.64.4.1.1. </span><code class="docutils literal notranslate"><span class="pre">name</span></code><a class="headerlink" href="#name" title="Permalink to this headline">¶</a></h4>
<p>Specifies the table name to be removed.</p>
<p>See <a class="reference internal" href="#table-remove-usage"><span class="std std-ref">Usage</span></a> how to use this parameter.</p>
</div>
</div>
<div class="section" id="optional-parameters">
<h3><span class="section-number">7.3.64.4.2. </span>Optional parameters<a class="headerlink" href="#optional-parameters" title="Permalink to this headline">¶</a></h3>
<p>There is only one optional parameter.</p>
<div class="section" id="dependent">
<span id="table-remove-dependent"></span><h4><span class="section-number">7.3.64.4.2.1. </span><code class="docutils literal notranslate"><span class="pre">dependent</span></code><a class="headerlink" href="#dependent" title="Permalink to this headline">¶</a></h4>
<div class="versionadded">
<p><span class="versionmodified added">New in version 6.0.1.</span></p>
</div>
<p>Specifies whether tables and columns that reference the target table
are also removed or not.</p>
<p>If this value is <code class="docutils literal notranslate"><span class="pre">yes</span></code>, tables and columns that reference the target
table are also removed. Otherwise, they aren’t removed and an error is
returned.</p>
<p>In other words, if there are any tables and columns that reference the
target table, the target table isn’t removed by default.</p>
<p>You should use this parameter carefully. This is a danger parameter.</p>
<p>See <a class="reference internal" href="#table-remove-remove-dependents"><span class="std std-ref">Removes a table with tables and columns that reference the target table</span></a> how to use this parameter.</p>
</div>
</div>
</div>
<div class="section" id="return-value">
<h2><span class="section-number">7.3.64.5. </span>Return value<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
<p>The command returns <code class="docutils literal notranslate"><span class="pre">true</span></code> as body on success such as:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>[HEADER, true]
</pre></div>
</div>
<p>If the command fails, error details are in <code class="docutils literal notranslate"><span class="pre">HEADER</span></code>.</p>
<p>See <a class="reference internal" href="../command/output_format.html"><span class="doc">Output format</span></a> for <code class="docutils literal notranslate"><span class="pre">HEADER</span></code>.</p>
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<h3><a href="../../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.3.64. <code class="docutils literal notranslate"><span class="pre">table_remove</span></code></a><ul>
<li><a class="reference internal" href="#summary">7.3.64.1. Summary</a></li>
<li><a class="reference internal" href="#syntax">7.3.64.2. Syntax</a></li>
<li><a class="reference internal" href="#usage">7.3.64.3. Usage</a><ul>
<li><a class="reference internal" href="#basic-usage">7.3.64.3.1. Basic usage</a></li>
<li><a class="reference internal" href="#unremovable-cases">7.3.64.3.2. Unremovable cases</a></li>
<li><a class="reference internal" href="#removes-a-table-with-tables-and-columns-that-reference-the-target-table">7.3.64.3.3. Removes a table with tables and columns that reference the target table</a></li>
<li><a class="reference internal" href="#decreases-used-resources">7.3.64.3.4. Decreases used resources</a></li>
</ul>
</li>
<li><a class="reference internal" href="#parameters">7.3.64.4. Parameters</a><ul>
<li><a class="reference internal" href="#required-parameters">7.3.64.4.1. Required parameters</a><ul>
<li><a class="reference internal" href="#name">7.3.64.4.1.1. <code class="docutils literal notranslate"><span class="pre">name</span></code></a></li>
</ul>
</li>
<li><a class="reference internal" href="#optional-parameters">7.3.64.4.2. Optional parameters</a><ul>
<li><a class="reference internal" href="#dependent">7.3.64.4.2.1. <code class="docutils literal notranslate"><span class="pre">dependent</span></code></a></li>
</ul>
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</ul>
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<li><a class="reference internal" href="#return-value">7.3.64.5. Return value</a></li>
</ul>
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