Question

我在测试数据库中插入了1万行。我正在使用一些样本索引进行性能测试。目前，我在主键上创建了一个聚集索引，以查看完全匹配过滤器是否会有所作为，并且仍然需要800毫秒以上的时间来检索此结果：

注意：这只是高级示例测试，因此所有varchar列都填充有> 100。

version: '3.4'

services:
  webapp:
    image: mcr.microsoft.com/dotnet/core/samples:aspnetapp
    ports:
      - 80
      - 443
    environment:
      - ASPNETCORE_ENVIRONMENT=Development
      - ASPNETCORE_URLS=https://+:443;http://+:80
      - ASPNETCORE_Kestrel__Certificates__Default__Password=password
      - ASPNETCORE_Kestrel__Certificates__Default__Path=/https/aspnetapp.pfx
    volumes:
      - ~/.aspnet/https:/https:ro

CREATE UNIQUE INDEX people_idx ON people (id);
CLUSTER people USING people_idx;

select * from people
where id = 2;

我正确地考虑了吗？

我更新了群集索引以添加到CREATE TABLE "people" ( id SERIAL PRIMARY KEY, first_name varchar(255) default NULL, last_name varchar(255) default NULL, email varchar(255) default NULL, created_date varchar(255), phone varchar(100) default NULL, customer_id integer NULL );：

last_name

分析输出如下：

CREATE INDEX people_idx ON people (last_name);

EXPLAIN ANALYZE select * from people
where first_name = 'Sophia';

EXPLAIN ANALYZE select * from people
where last_name ILIKE 'd%';

了解Postgres索引-仍然很慢

0 个答案: