小编sta*_* jr的帖子

我正在尝试优化包含超过 8000 万行的表。需要 20 多分钟才能获得行计数结果。我尝试过集群、vacuum full 和重新索引，但性能没有提高。为了改进数据查询和检索，我需要配置或调整什么？我在 Windows 2019 下使用 Postgresql 12。

更新信息：

• 目前总行数约为 9200 万以上
• 表列数 = 44

• Explain query result using 'select count(*) from doc_details':  
      Finalize Aggregate  (cost=5554120.84..5554120.85 rows=1 width=8) (actual time=1249204.001..1249210.027 rows=1 loops=1)  
    ->  Gather  (cost=5554120.63..5554120.83 rows=2 width=8) (actual time=1249203.642..1249210.020 rows=3 loops=1)  
          Workers Planned: 2  
          Workers Launched: 2  
          ->  Partial Aggregate  (cost=5553120.63..5553120.63 rows=1 width=8) (actual time=1249153.615..1249153.616 rows=1 loops=3)  
                ->  Parallel Seq Scan on doc_details  (cost=0.00..5456055.30 rows=38826130 width=0) (actual time=3.793..1245165.604 rows=31018949 loops=3)  
  Planning Time: 1.290 ms  
  Execution Time: …

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