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doc-exports/docs/dws/tool/dws_16_0132.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_0000001860318729"></a><a name="EN-US_TOPIC_0000001860318729"></a>
<h1 class="topictitle1">DELAY_KEY_WRITE</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001860318729__en-us_topic_0000001385616038_en-us_topic_0214164432_p579713312318"><strong id="EN-US_TOPIC_0000001860318729__en-us_topic_0000001385616038_b124183821432158">DELAY_KEY_WRITE</strong> is valid only for MyISAM tables. It is used to delay updates until the table is closed. GaussDB(DWS) does not support table definition modification using this attribute. DSC will delete the attribute during migration.</p>
<p id="EN-US_TOPIC_0000001860318729__en-us_topic_0000001385616038_en-us_topic_0214164432_p819210440419"><strong id="EN-US_TOPIC_0000001860318729__en-us_topic_0000001385616038_en-us_topic_0214164432_b289713285164">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860318729__en-us_topic_0000001385616038_en-us_topic_0214164432_screen19200191373016"><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></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_tbl_test</span><span class="o">`</span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">runoob_id</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">30</span><span class="p">),</span>
<span class="w"> </span><span class="o">`</span><span class="n">runoob_title</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">100</span><span class="p">)</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="o">`</span><span class="n">runoob_author</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">40</span><span class="p">)</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="o">`</span><span class="n">submission_date</span><span class="o">`</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">30</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="p">,</span><span class="w"> </span><span class="n">DELAY_KEY_WRITE</span><span class="o">=</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="o">`</span><span class="k">public</span><span class="o">`</span><span class="p">.</span><span class="o">`</span><span class="n">runoob_tbl_test6</span><span class="o">`</span><span class="w"> </span><span class="n">DELAY_KEY_WRITE</span><span class="o">=</span><span class="mi">1</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001860318729__en-us_topic_0000001385616038_en-us_topic_0214164432_p12114173518210"><strong id="EN-US_TOPIC_0000001860318729__en-us_topic_0000001385616038_en-us_topic_0214164432_b75411332121613">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001860318729__en-us_topic_0000001385616038_en-us_topic_0214164432_screen18579330113120"><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></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_tbl_test&quot;</span>
<span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;runoob_id&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">120</span><span class="p">),</span>
<span class="w"> </span><span class="ss">&quot;runoob_title&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">400</span><span class="p">)</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="ss">&quot;runoob_author&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">160</span><span class="p">)</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="ss">&quot;submission_date&quot;</span><span class="w"> </span><span class="nb">VARCHAR</span><span class="p">(</span><span class="mi">120</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;runoob_id&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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