要 update 个 3000W 行的大表做数据 migration，怎么操作比较好 - V2EX

要 update 个 3000W 行的大表做数据 migration，怎么操作比较好 - V2EX

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这是一个创建于 2102 天前的主题，其中的信息可能已经有所发展或是发生改变。

数据库是 postgresql，以前经纬度用的单独字段，现在像用 point 类型再加 postgis 做分析。表有优化，相当于做了表分区，现在 sql 是

update t_gps set locatin = ST_GeomFromText('Point(' || "lont" || ' ' || "lat" || ')', 4326); create index idx_gps_location on t_gps using gist ("location");

但在测试库试了下，真的很慢。一般这种更新方案怎么做比较好？

4 条回复 2020-01-14 09:40:32 +08:00

1

nandaye

2020-01-13 11:46:45 +08:00

1

create table test as select t_gps.*,ST_GeomFromText('Point(' || "lont" || ' ' || "lat" || ')', 4326) as location from t_gps;
drot table t_gps;
rename test to t_gps;

2

rockyou12

OP

2020-01-13 14:20:42 +08:00

@nandaye 感谢，思路懂了

3

dswyzx

2020-01-13 16:15:43 +08:00

@nandaye 跟建索引一个套路哇.

4

duhui

2020-01-14 09:40:32 +08:00

drot table t_gps; 改成 rename t_gps to t_gps_bak; 比较好吧

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