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doc-exports/docs/dws/tool/dws_16_0124.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_0000001813599020"></a><a name="EN-US_TOPIC_0000001813599020"></a>
<h1 class="topictitle1">BLOCK_SIZE</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001813599020__en-us_topic_0000001447210609_p8060118">In ADB, this parameter specifies the number of values stored in each block in columnar storage, which is also the minimum I/O unit. GaussDB(DWS does not support table definition modification using this attribute. DSC will delete the keyword during migration.</p>
<p id="EN-US_TOPIC_0000001813599020__en-us_topic_0000001447210609_p189481310494"><strong id="EN-US_TOPIC_0000001813599020__en-us_topic_0000001447210609_b11333101313113">Input</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813599020__en-us_topic_0000001447210609_screen860331891013"><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></pre></div></td><td class="code"><div><pre><span></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="k">exists</span><span class="w"> </span><span class="n">unsupport_parse_test</span><span class="p">;</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="n">unsupport_parse_test</span><span class="o">`</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="o">`</span><span class="n">username</span><span class="o">`</span><span class="w"> </span><span class="nb">int</span><span class="p">,</span>
<span class="w"> </span><span class="o">`</span><span class="k">update</span><span class="o">`</span><span class="w"> </span><span class="k">timestamp</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="k">default</span><span class="w"> </span><span class="k">current_timestamp</span><span class="w"> </span><span class="k">on</span><span class="w"> </span><span class="k">update</span><span class="w"> </span><span class="k">current_timestamp</span><span class="w"> </span><span class="p">,</span>
<span class="w"> </span><span class="n">clustered</span><span class="w"> </span><span class="k">key</span><span class="w"> </span><span class="n">clustered_key</span><span class="p">(</span><span class="n">shopid</span><span class="w"> </span><span class="k">ASC</span><span class="p">,</span><span class="w"> </span><span class="n">datetype</span><span class="w"> </span><span class="k">ASC</span><span class="p">)</span>
<span class="p">)</span><span class="n">BLOCK_SIZE</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1024</span><span class="w"> </span><span class="n">index_ALL</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'y'</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="n">unsupport_parse_test</span><span class="p">;</span>
</pre></div></td></tr></table></div>
</div>
<p id="EN-US_TOPIC_0000001813599020__en-us_topic_0000001447210609_p3109141716912"><strong id="EN-US_TOPIC_0000001813599020__en-us_topic_0000001447210609_b1795514931118">Output</strong></p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001813599020__en-us_topic_0000001447210609_screen1090715309105"><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></pre></div></td><td class="code"><div><pre><span></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;unsupport_parse_test&quot;</span><span class="p">;</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;unsupport_parse_test&quot;</span><span class="w"> </span><span class="p">(</span>
<span class="w"> </span><span class="ss">&quot;username&quot;</span><span class="w"> </span><span class="nb">INTEGER</span><span class="p">,</span>
<span class="w"> </span><span class="ss">&quot;update&quot;</span><span class="w"> </span><span class="k">TIMESTAMP</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="k">TIME</span><span class="w"> </span><span class="k">ZONE</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="k">DEFAULT</span><span class="w"> </span><span class="k">CURRENT_TIMESTAMP</span>
<span class="p">)</span><span class="w"> </span><span class="k">WITH</span><span class="w"> </span><span class="p">(</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="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;username&quot;</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;unsupport_parse_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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