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<p>Tid 扫描(tuple ID scan) )很少用到，表的每一行记录都有一个唯一标记，这个标记名为 tuple ID, 当我们查询记录时，也可以将行的 tuple ID 标记查出来,例如以下</p>
<figure class="highlight lsl"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">mydb=> select ctid,* from test_id limit <span class="number">2</span>; </span><br><span class="line">ctid | id | name </span><br><span class="line">-------+----+------ </span><br><span class="line">(<span class="number">0</span>,<span class="number">1</span>) | <span class="number">1</span> | a </span><br><span class="line">(<span class="number">0</span>,<span class="number">2</span>) | <span class="number">2</span> | b </span><br><span class="line">(<span class="number">2</span> rows)</span><br></pre></td></tr></table></figure>
<p>ctid 是一个很特殊的字段，它是自动生成的，ctid由两部分组成，第一部分是指 block的编号，第二部分是指这个BLOCK上的记录编号。</p>
<h1 id="创建测试表"><a href="#创建测试表" class="headerlink" title="创建测试表"></a>创建测试表</h1><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">create</span> <span class="keyword">table</span> test_8 (<span class="keyword">id</span> <span class="built_in">integer</span>,remark <span class="built_in">varchar</span>(<span class="number">32</span>) );</span><br></pre></td></tr></table></figure>
<p>插入10000条数据<br><figure class="highlight vbnet"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">CREATE <span class="keyword">OR</span> REPLACE <span class="keyword">FUNCTION</span> skytf.fun_ins_test_1() </span><br><span class="line">RETURNS <span class="built_in">integer</span> </span><br><span class="line">LANGUAGE plpgsql </span><br><span class="line"><span class="keyword">AS</span> $<span class="keyword">function</span>$ </span><br><span class="line"> <span class="keyword">DECLARE</span></span><br><span class="line"> i <span class="built_in">INTEGER</span> ; </span><br><span class="line"> BEGIN </span><br><span class="line"> <span class="keyword">for</span> i <span class="keyword">in</span> <span class="number">1.</span><span class="number">.10000</span> <span class="keyword">loop</span> </span><br><span class="line"> insert <span class="keyword">into</span> test_8 values (<span class="number">1</span>,<span class="comment">'a'); </span></span><br><span class="line"> <span class="keyword">end</span> <span class="keyword">loop</span>; </span><br><span class="line"> <span class="keyword">return</span> <span class="number">1</span>; </span><br><span class="line"> <span class="keyword">END</span>; </span><br><span class="line"> $<span class="keyword">function</span>$ </span><br><span class="line"> </span><br><span class="line">mydb=> <span class="keyword">select</span> skytf.fun_ins_test_1(); </span><br><span class="line">fun_ins_test_1 </span><br><span class="line">---------------- </span><br><span class="line"> <span class="number">1</span> </span><br><span class="line">(<span class="number">1</span> row)</span><br></pre></td></tr></table></figure></p>
<h1 id="表分析并查询统计信息"><a href="#表分析并查询统计信息" class="headerlink" title="表分析并查询统计信息"></a>表分析并查询统计信息</h1><figure class="highlight routeros"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="attribute">mydb</span>=> analyze test_8; </span><br><span class="line">ANALYZE</span><br><span class="line"></span><br><span class="line"><span class="attribute">mydb</span>=> select relname,relpages,reltuples <span class="keyword">from</span> pg_class where <span class="attribute">relname</span>=<span class="string">'test_8'</span>; </span><br><span class="line">relname | relpages | reltuples </span><br><span class="line">---------+----------+----------- </span><br><span class="line">test_8 | 45 | 10000 </span><br><span class="line">(1 row)</span><br><span class="line"> </span><br><span class="line"><span class="attribute">mydb</span>=> select 10000/45; </span><br><span class="line">?column? </span><br><span class="line">---------- </span><br><span class="line"> 222 </span><br><span class="line">(1 row)</span><br></pre></td></tr></table></figure>
<p>上面可以看出表test_8 占用了 45 个PAGE,每个pages含有约 222 条记录。查看最后300条记录的ctid<br><figure class="highlight lsl"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br><span class="line">163</span><br><span class="line">164</span><br><span class="line">165</span><br><span class="line">166</span><br><span class="line">167</span><br><span class="line">168</span><br><span class="line">169</span><br><span class="line">170</span><br><span class="line">171</span><br><span class="line">172</span><br><span class="line">173</span><br><span class="line">174</span><br><span class="line">175</span><br><span class="line">176</span><br><span class="line">177</span><br><span class="line">178</span><br><span class="line">179</span><br><span class="line">180</span><br><span class="line">181</span><br><span class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br><span class="line">187</span><br><span class="line">188</span><br><span class="line">189</span><br><span class="line">190</span><br><span class="line">191</span><br><span class="line">192</span><br><span class="line">193</span><br><span class="line">194</span><br><span class="line">195</span><br><span class="line">196</span><br><span class="line">197</span><br><span class="line">198</span><br><span class="line">199</span><br><span class="line">200</span><br><span class="line">201</span><br><span class="line">202</span><br><span class="line">203</span><br><span class="line">204</span><br><span class="line">205</span><br><span class="line">206</span><br><span class="line">207</span><br><span class="line">208</span><br><span class="line">209</span><br><span class="line">210</span><br><span class="line">211</span><br><span class="line">212</span><br><span class="line">213</span><br><span class="line">214</span><br><span class="line">215</span><br><span class="line">216</span><br><span class="line">217</span><br><span class="line">218</span><br><span class="line">219</span><br><span class="line">220</span><br><span class="line">221</span><br><span class="line">222</span><br><span class="line">223</span><br><span class="line">224</span><br><span class="line">225</span><br><span class="line">226</span><br><span class="line">227</span><br><span class="line">228</span><br><span class="line">229</span><br><span class="line">230</span><br><span class="line">231</span><br><span class="line">232</span><br><span class="line">233</span><br><span class="line">234</span><br><span class="line">235</span><br><span class="line">236</span><br><span class="line">237</span><br><span class="line">238</span><br><span class="line">239</span><br><span class="line">240</span><br><span class="line">241</span><br><span class="line">242</span><br><span class="line">243</span><br><span class="line">244</span><br><span class="line">245</span><br><span class="line">246</span><br><span class="line">247</span><br><span class="line">248</span><br><span class="line">249</span><br><span class="line">250</span><br><span class="line">251</span><br><span class="line">252</span><br><span class="line">253</span><br><span class="line">254</span><br><span class="line">255</span><br><span class="line">256</span><br><span class="line">257</span><br><span class="line">258</span><br><span class="line">259</span><br><span class="line">260</span><br><span class="line">261</span><br><span class="line">262</span><br><span class="line">263</span><br><span class="line">264</span><br><span class="line">265</span><br><span class="line">266</span><br><span class="line">267</span><br><span class="line">268</span><br><span class="line">269</span><br><span class="line">270</span><br><span class="line">271</span><br><span class="line">272</span><br><span class="line">273</span><br><span class="line">274</span><br><span class="line">275</span><br><span class="line">276</span><br><span class="line">277</span><br><span class="line">278</span><br><span class="line">279</span><br><span class="line">280</span><br><span class="line">281</span><br><span class="line">282</span><br><span class="line">283</span><br><span class="line">284</span><br><span class="line">285</span><br><span class="line">286</span><br></pre></td><td class="code"><pre><span class="line">mydb=> select ctid,id from test_8 offset <span class="number">9700</span>; </span><br><span class="line"> ctid | id </span><br><span class="line">----------+---- </span><br><span class="line">(<span class="number">43</span>,<span class="number">1</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">2</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">3</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">4</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">5</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">6</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">7</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">8</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">9</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">10</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">11</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">12</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">13</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">14</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">15</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">16</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">17</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">18</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">19</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">20</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">21</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">22</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">23</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">24</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">25</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">26</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">27</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">28</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">29</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">30</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">31</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">32</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">33</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">34</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">35</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">36</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">37</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">38</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">39</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">40</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">41</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">42</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">43</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">44</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">45</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">46</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">47</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">48</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">49</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">50</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">51</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">52</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">53</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">54</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">55</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">56</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">57</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">58</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">59</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">60</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">61</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">62</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">63</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">64</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">65</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">66</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">67</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">68</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">69</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">70</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">71</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">72</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">73</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">74</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">75</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">76</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">77</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">78</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">79</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">43</span>,<span class="number">80</span>) | <span class="number">1</span> </span><br><span class="line">(<span 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class="number">44</span>,<span class="number">19</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">20</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">21</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">22</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">23</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">24</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">25</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">26</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">27</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">28</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">29</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">30</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">31</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">32</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">33</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">34</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">35</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">36</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">37</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">38</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">39</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">40</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">41</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">42</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">43</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">44</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">45</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">46</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">47</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">48</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">49</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">50</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">51</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">52</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">53</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">54</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">55</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">56</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">300</span> rows)</span><br></pre></td></tr></table></figure></p>
<p>到这里，大家可以清楚的看到TID的含义，TID的第一列为BLOCK的编号，第二列为这个BLOCK上的记录编号，并注意表 TEST_8的最后一条记录的TID为 (44,56),现在我们接着做个实验，更新全表的 remark字段，看下会发生什么情况。</p>
<h1 id="更新记录并查看表占用PAGE"><a href="#更新记录并查看表占用PAGE" class="headerlink" title="更新记录并查看表占用PAGE"></a>更新记录并查看表占用PAGE</h1><figure class="highlight routeros"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="attribute">mydb</span>=> update test_8 <span class="builtin-name">set</span> <span class="attribute">remark</span>=<span class="string">'b'</span>; </span><br><span class="line">UPDATE 10000</span><br><span class="line"></span><br><span class="line"><span class="attribute">mydb</span>=> analyze test_8; </span><br><span class="line">ANALYZE</span><br><span class="line"></span><br><span class="line"><span class="attribute">mydb</span>=> select relname,relpages,reltuples <span class="keyword">from</span> pg_class where <span class="attribute">relname</span>=<span class="string">'test_8'</span>; </span><br><span class="line">relname | relpages | reltuples </span><br><span class="line">---------+----------+----------- </span><br><span class="line">test_8 | 89 | 10000</span><br></pre></td></tr></table></figure>
<p>大家看到，test_8 占用的 pages数由原来的44，上升到现在的89, 刚好翻了一倍 </p>
<p>再次查询TID<br><figure class="highlight lsl"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">mydb=> select ctid,id from test_8 order by ctid limit <span class="number">250</span> ; </span><br><span class="line"> ctid | id </span><br><span class="line">----------+---- </span><br><span class="line">(<span class="number">44</span>,<span class="number">57</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">58</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">59</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">60</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">61</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">62</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">63</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">64</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">65</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">66</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">67</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">68</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">69</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">70</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">71</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">72</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">73</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">74</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">75</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">76</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">77</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">78</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">79</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">80</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">81</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">82</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">83</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">84</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">85</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">86</span>) | <span class="number">1</span> </span><br><span class="line">(<span class="number">44</span>,<span class="number">87</span>) | <span class="number">1</span> </span><br><span class="line">...</span><br></pre></td></tr></table></figure></p>
<p>上面省略了部分结果集, 注意第一条 (44,57) , 以及上一个步骤的最后一条(44,56), 惊奇的发现，update后，PG保留了原有数据，而是在物理存储上顺序接着往下写下新的数据。</p>
<p>TID 查询的执行计划<br><figure class="highlight lasso"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">mydb=> explain analyze <span class="keyword">select</span> ctid, id from test_8 <span class="keyword">where</span> ctid =<span class="string">'(44,87)'</span>; </span><br><span class="line"> QUERY PLAN </span><br><span class="line">------------------------------------------------------------------------------------------------- </span><br><span class="line">Tid Scan <span class="keyword">on</span> test_8 (cost=<span class="number">0.00</span>.<span class="number">.4</span><span class="number">.01</span> <span class="keyword">rows</span>=<span class="number">1</span> width=<span class="number">10</span>) (actual time=<span class="number">0.147</span>.<span class="number">.0</span><span class="number">.158</span> <span class="keyword">rows</span>=<span class="number">1</span> loops=<span class="number">1</span>) </span><br><span class="line"> TID Cond: (ctid = <span class="string">'(44,87)'</span><span class="type">::tid</span>) </span><br><span class="line">Total runtime: <span class="number">0.272</span> ms </span><br><span class="line">(<span class="number">3</span> <span class="keyword">rows</span>)</span><br></pre></td></tr></table></figure></p>
<h1 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h1><p>TID是每张表的隐含列，它指定了记录行在存储上的物理位置，TID SCAN 能很快的检索数据，因为它根据物理文件的bloack号和记录编号可以直接读取数据。</p>
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