<p class="intro">pg_class.relpages pg_class.reltuples只是近，和实际数据会有点误差；新建空表，首次insert对自动收集和更新统计信息，影响的表pg_class\pg_stats；对于insert操作:analyze会更新表pg_class\pg_stats，而vacuum或者acuum full只会更新pg_class，并不会更新任</p>
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