目前网上绝大多数教程都停留在表面：只教你执行 VACUUM、VACUUM FULL，完全不讲底层 MVCC 机制、Vacuum 阻塞根源、不同操作的风险边界。很多团队盲目操作，轻则膨胀反复复发，重则线上锁表、业务瘫痪。

Philadelphia region is home to 12 companies that cracked the Fortune 500 list for 2018. And then there's Vanguard, plus the big hospital systems and universities. Forty-five students graduated this ...