的大小超过 10 MB。</p>
<pre>LOG:   DB node id: 0 backend pid: 17749 statement: SELECT * FROM pgbench_accounts ;
LOG:   pool_add_temp_query_cache: <b>data size exceeds memqcache_maxcache</b>.
                                  current:983 requested:110 memq_maxcache:1024
</pre>

<h3 id="no_query_cache">指定某个查询不需要缓存</h3>
<p>如果白名单和黑名单还不够用，可以在查询最开始的地方
put the text "/* NO QUERY CACHE */" at the head of the queries.</p>

<pre>LOG:   state