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doc-exports/docs/dws/dev/dws_04_1234.html
luhuayi 177cd61a57 DWS DEVG 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>
2025-05-05 07:44:03 +00:00

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<a name="EN-US_TOPIC_0000001885792441"></a><a name="EN-US_TOPIC_0000001885792441"></a>
<h1 class="topictitle1">PGXC_DISK_CACHE_ALL_STATS</h1>
<div id="body0000001885792441"><p id="EN-US_TOPIC_0000001885792441__p7719204118118"><strong id="EN-US_TOPIC_0000001885792441__b9681104420223">PGXC_DISK_CACHE_ALL_STATS</strong> records all usage of file cache. This system view is supported only by clusters of version 9.1.0 or later.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001885792441__table171074117348" frame="border" border="1" rules="all"><caption><b>Table 1 </b>PGXC_DISK_CACHE_ALL_STATS columns</caption><thead align="left"><tr id="EN-US_TOPIC_0000001885792441__row1110711123420"><th align="left" class="cellrowborder" valign="top" width="28.33%" id="mcps1.3.2.2.4.1.1"><p id="EN-US_TOPIC_0000001885792441__p17107101133413"><strong id="EN-US_TOPIC_0000001885792441__b13566989464384">Column</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="28.799999999999997%" id="mcps1.3.2.2.4.1.2"><p id="EN-US_TOPIC_0000001885792441__p10107181110344">Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="42.870000000000005%" id="mcps1.3.2.2.4.1.3"><p id="EN-US_TOPIC_0000001885792441__p8107201173418">Description</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001885792441__row7107101113348"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p13107111143413">node_name</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p1310719119341">Text</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p4107311103418">Node name.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row16107171163418"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p1210791143410">total_read</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p51079116342">Bigint</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p810714115340">Total number of accesses to disk cache.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row710716119341"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p15108171115348">local_read</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p17108131173420">Bigint</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p14108141153418">Total number of times disk cache accesses local disk.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row1510871111341"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p151085118346">remote_read</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p1110820113346">Bigint</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p710819111344">Total number of times disk cache accesses remote storage.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row810821173413"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p1910861116345">hit_rate</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p31086116347">numeric(5,2)</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p7108191111342">Hit rate of disk cache.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row12108151120340"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p121081011153412">cache_size</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p1108201173417">Bigint</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p161088112343">Total size of data saved in disk cache, in KB.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row710818111343"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p1410891143413">fill_rate</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p1710891110343">numeric(5,2)</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p11108141183419">Fill rate of disk cache.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row148881538103811"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p3889038183820">temp_file_size</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p6889238203815">Bigint</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p488943819382">Total size of temporary/cold cache files, in KB.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row182831615411"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p142921634117">a1in_size</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p029616154114">Bigint</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p1291316154110">Total size of data saved in the <strong id="EN-US_TOPIC_0000001885792441__b57999528267">a1in</strong> queue of disk cache, in KB.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row910395754115"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p4103185718412">a1out_size</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p710355712417">Bigint</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p15103175710413">Total size of data saved in the <strong id="EN-US_TOPIC_0000001885792441__b279111019273">a1out</strong> queue of disk cache, in KB.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row6701615194217"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p18701161584219">am_size</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p107015154423">Bigint</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p1770114154422">Total size of data saved in the <strong id="EN-US_TOPIC_0000001885792441__b9763131392715">am</strong> queue of disk cache, in KB.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row025016266427"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p52509268424">a1in_fill_rate</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p132509262422">numeric(5,2)</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p9250162618428">Fill rate of the <strong id="EN-US_TOPIC_0000001885792441__b96841242162718">a1in</strong> queue in disk cache.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row17331442134213"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p233114244213">a1out_fill_rate</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p1633242124213">numeric(5,2)</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p333124234214">Fill rate of the <strong id="EN-US_TOPIC_0000001885792441__b1068165242711">a1out</strong> queue in disk cache.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row1618105516429"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p4618115514214">am_fill_rate</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p16618125515420">numeric(5,2)</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p116181155174220">Fill rate of the <strong id="EN-US_TOPIC_0000001885792441__b7472324289">am</strong> queue in disk cache.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row879191112437"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p12792114430">fd</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p1579131111437">Integer</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p14793116435">Number of file descriptors currently in use by disk cache.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001885792441__row44418418016"><td class="cellrowborder" valign="top" width="28.33%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001885792441__p174411047014">pin_block_count</p>
</td>
<td class="cellrowborder" valign="top" width="28.799999999999997%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001885792441__p544194301">Bigint</p>
</td>
<td class="cellrowborder" valign="top" width="42.870000000000005%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001885792441__p244134200">Number of pinned blocks in disk cache. This field is supported only by 9.1.0.100 and later cluster versions.</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="EN-US_TOPIC_0000001885792441__section13751112013476"><h4 class="sectiontitle">Example</h4><p id="EN-US_TOPIC_0000001885792441__p37211629104713">Query the number of file descriptors used by disk cache on each node.</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001885792441__screen282255144912"><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">SELECT</span><span class="w"> </span><span class="n">fd</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pgxc_disk_cache_all_stats</span><span class="p">;</span>
<span class="w"> </span><span class="n">fd</span>
<span class="c1">------</span>
<span class="w"> </span><span class="mi">1000</span>
<span class="w"> </span><span class="mi">1000</span>
<span class="w"> </span><span class="mi">0</span>
<span class="w"> </span><span class="mi">0</span>
<span class="w"> </span><span class="mi">0</span>
<span class="w"> </span><span class="mi">0</span>
<span class="p">(</span><span class="mi">6</span><span class="w"> </span><span class="k">rows</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_04_0639.html">System Views</a></div>
</div>
</div>
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