 * FROM table_cache_ok WHERE a = 1;
</pre>

<p>确认是否 SELECT FROM 不在 black_memqcache_table_list 中的表被缓存。</p>
<pre>test=&gt; SELECT * FROM table_cache_ok WHERE a = 1;
LOG:   DB node id: 0 backend pid: 11203 statement: SELECT oid FROM pg_database WHERE datname = 'test'

test=&gt; SELECT * FROM table_cache_ok WHERE a = 1;
LOG:   <b>query result fetched from cache.</b> statement: SELECT * FROM table_cache_ok WHERE a = 1;
</pre>

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