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doc-exports/docs/dws/tool/dws_16_0120.html
luhuayi a5e3903f6b DWS TG 910.211 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: luhuayi <luhuayi@huawei.com>
Co-committed-by: luhuayi <luhuayi@huawei.com>
2025-04-23 13:53:01 +00:00

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<a name="EN-US_TOPIC_0000001860198985"></a><a name="EN-US_TOPIC_0000001860198985"></a>
<h1 class="topictitle1">ALGORITHM</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001860198985__en-us_topic_0000001447547997_p8060118">MySQL has extended the support for <strong id="EN-US_TOPIC_0000001860198985__en-us_topic_0000001447547997_b945989183217">ALTER TABLE... ALGORITHM=INSTANT</strong>: Users can add columns instantly and delete columns instantly anywhere in a table, and evaluate row size limits when adding a column.</p>
<p id="EN-US_TOPIC_0000001860198985__en-us_topic_0000001447547997_en-us_topic_0214164646_p143621254164014">This is not supported by GaussDB(DWS) and is deleted by DSC during the migration.</p>
<p id="EN-US_TOPIC_0000001860198985__en-us_topic_0000001447547997_p1378811446111"><strong id="EN-US_TOPIC_0000001860198985__en-us_topic_0000001447547997_b19930163035014">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860198985__en-us_topic_0000001447547997_screen2030119281336"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
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<span class="normal">5</span>
<span class="normal">6</span>
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<span class="normal">8</span>
<span class="normal">9</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="k">DEFAULT</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="n">INPLACE</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="k">COPY</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">COL_18</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">64</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'00'</span><span class="p">,</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="n">INSTANT</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="k">MODIFY</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">dataType7</span><span class="w"> </span><span class="nb">BIGINT</span><span class="p">,</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="k">COPY</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="o">`</span><span class="n">runoob_alter_test</span><span class="o">`</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="k">DEFAULT</span><span class="p">,</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="n">INPLACE</span><span class="p">,</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="k">COPY</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="o">`</span><span class="n">runoob_alter_test</span><span class="o">`</span><span class="w"> </span><span class="k">ADD</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">dataType11</span><span class="w"> </span><span class="nb">INT</span><span class="p">,</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="k">DEFAULT</span><span class="p">,</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="n">INPLACE</span><span class="p">,</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="k">COPY</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="n">CHANGE</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">dataType11</span><span class="w"> </span><span class="n">dataType12</span><span class="w"> </span><span class="nb">SMALLINT</span><span class="w"> </span><span class="p">,</span><span class="n">ALGORITHM</span><span class="o">=</span><span class="n">INPLACE</span><span class="p">,</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="k">COPY</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="n">runoob_alter_test</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="n">INPLACE</span><span class="p">,</span><span class="w"> </span><span class="n">ALGORITHM</span><span class="o">=</span><span class="k">COPY</span><span class="p">,</span><span class="w"> </span><span class="k">DROP</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="n">dataType12</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001860198985__en-us_topic_0000001447547997_p679625810112"><strong id="EN-US_TOPIC_0000001860198985__en-us_topic_0000001447547997_b90418700231714">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860198985__en-us_topic_0000001447547997_screen17962325313"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span>
<span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span>
<span class="k">ADD</span>
<span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="ss">&quot;col_18&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">256</span><span class="p">)</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="s1">'00'</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span>
<span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="k">MODIFY</span><span class="w"> </span><span class="ss">&quot;datatype7&quot;</span><span class="w"> </span><span class="nb">BIGINT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span>
<span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span>
<span class="k">ADD</span>
<span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="ss">&quot;datatype11&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span>
<span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="n">CHANGE</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="ss">&quot;datatype11&quot;</span><span class="w"> </span><span class="ss">&quot;datatype12&quot;</span><span class="w"> </span><span class="nb">SMALLINT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="k">DEFAULT</span><span class="w"> </span><span class="k">NULL</span><span class="p">;</span>
<span class="k">ALTER</span><span class="w"> </span><span class="k">TABLE</span>
<span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="w"> </span><span class="k">DROP</span><span class="w"> </span><span class="k">COLUMN</span><span class="w"> </span><span class="ss">&quot;datatype12&quot;</span><span class="w"> </span><span class="k">RESTRICT</span><span class="p">;</span>
<span class="k">DROP</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="k">IF</span><span class="w"> </span><span class="k">EXISTS</span><span class="w"> </span><span class="ss">&quot;public&quot;</span><span class="p">.</span><span class="ss">&quot;runoob_alter_test&quot;</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_16_0119.html">Table (Optional Parameters and Operations)</a></div>
</div>
</div>
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