测试数据表包含约 100 万条记录；每次写入修改单条记录，每次读取使用索引。
Limit (cost=22944.38..22944.41 rows=10 width=289) (actual time=33747.662..33747.667 rows=10.00 loops=1)，详情可参考钉钉
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Hyuckchul Jung, Florida Institute for Human and Machine Cognition
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