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doc-exports/docs/dws/tool/dws_16_0145.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_0000001860318733"></a><a name="EN-US_TOPIC_0000001860318733"></a>
<h1 class="topictitle1">PACK_KEYS</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001860318733__en-us_topic_0000001436055761_en-us_topic_0214164502_p579713312318">In MySQL, <strong id="EN-US_TOPIC_0000001860318733__en-us_topic_0000001436055761_b128989613032424">PACK_KEYS</strong> specifies the index compression mode in the MyISAM storage engine. GaussDB(DWS) does not support this attribute, which will be deleted by DSC during migration.</p>
<p id="EN-US_TOPIC_0000001860318733__en-us_topic_0000001436055761_en-us_topic_0214164502_p8625165918420"><strong id="EN-US_TOPIC_0000001860318733__en-us_topic_0000001436055761_en-us_topic_0214164502_b183861240195515">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860318733__en-us_topic_0000001436055761_en-us_topic_0214164502_screen11491161995312"><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>
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<span class="normal"> 9</span>
<span class="normal">10</span>
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<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</span><span class="w"> </span><span class="k">TABLE</span><span class="w"> </span><span class="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">runoob_alter_test</span><span class="o">`</span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType1</span><span class="o">`</span><span class="w"> </span><span class="nb">int</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="w"> </span><span class="n">AUTO_INCREMENT</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType2</span><span class="o">`</span><span class="w"> </span><span class="n">DOUBLE</span><span class="p">(</span><span class="mi">20</span><span class="p">,</span><span class="mi">8</span><span class="p">),</span>
<span class="w"> </span><span class="o">`</span><span class="n">dataType3</span><span class="o">`</span><span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="p">(</span><span class="o">`</span><span class="n">dataType1</span><span class="o">`</span><span class="p">)</span>
<span class="p">)</span><span class="w"> </span><span class="n">ENGINE</span><span class="o">=</span><span class="n">MyISAM</span><span class="w"> </span><span class="n">PACK_KEYS</span><span class="o">=</span><span class="mi">1</span><span class="p">;</span>
<span class="o">##</span><span class="n">A</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">PACK_KEYS</span><span class="w"> </span><span class="mi">0</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">PACK_KEYS</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span>
<span class="o">##</span><span class="n">B</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">PACK_KEYS</span><span class="w"> </span><span class="mi">1</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">PACK_KEYS</span><span class="o">=</span><span class="mi">1</span><span class="p">;</span>
<span class="o">##</span><span class="k">C</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">PACK_KEYS</span><span class="w"> </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">PACK_KEYS</span><span class="o">=</span><span class="k">DEFAULT</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001860318733__en-us_topic_0000001436055761_en-us_topic_0214164502_p12114173518210"><strong id="EN-US_TOPIC_0000001860318733__en-us_topic_0000001436055761_en-us_topic_0214164502_b964244412554">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860318733__en-us_topic_0000001436055761_en-us_topic_0214164502_screen1360576145519"><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>
<span class="normal">16</span>
<span class="normal">17</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">CREATE</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="p">(</span>
<span class="w"> </span><span class="ss">&quot;datatype1&quot;</span><span class="w"> </span><span class="nb">SERIAL</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span>
<span class="w"> </span><span class="ss">&quot;datatype2&quot;</span><span class="w"> </span><span class="n">DOUBLE</span><span class="w"> </span><span class="k">PRECISION</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;datatype3&quot;</span><span class="w"> </span><span class="nb">TEXT</span><span class="w"> </span><span class="k">NOT</span><span class="w"> </span><span class="k">NULL</span><span class="p">,</span>
<span class="w"> </span><span class="k">PRIMARY</span><span class="w"> </span><span class="k">KEY</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype1&quot;</span><span class="p">)</span>
<span class="p">)</span>
<span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">ORIENTATION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ROW</span><span class="p">,</span><span class="w"> </span><span class="n">COMPRESSION</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">NO</span><span class="w"> </span><span class="p">)</span>
<span class="w"> </span><span class="n">NOCOMPRESS</span>
<span class="w"> </span><span class="n">DISTRIBUTE</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="n">HASH</span><span class="w"> </span><span class="p">(</span><span class="ss">&quot;datatype1&quot;</span><span class="p">);</span>
<span class="c1">--A</span>
<span class="c1">--B</span>
<span class="c1">--C</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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