sql server merge into 与update 批量更新1 百万测试数据的性能比较

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1. 1百万的测试数据的生成

declare @index int;
begin
set @index=0;
while @index<1000000
begin
insert into teptable values(@index,STR(@index)+'name',str(@index)+'appname');
set @index=@index+1;
end
end

2. merge into sql 更新语句

-- 同库数据更新
merge into teptable1 as t1
using teptable1 as t2
on t1.id=t2.id
when matched then
update set t1.name=t2.appname
when not matched then
insert
values (t2.id,t2.name,t2.appname);

-- 跨库数据更新

merge into buckinsert.dbo.teptable1 as t1
using userinfo.dbo.teptable as t2
on t1.id=t2.id
when matched then
update set t1.appname=t2.appname+'demo aaa'
when not matched then
insert
values (t2.id,t2.name,t2.appname);

以上sql 分为跨库与同库之分

3. update 批量语句 sql

update a set name = b.appname+'ssss' from teptable1 a,teptable1 b
where a.id =b.id

4. 生成的执行任务的截图

a. 使用update 的任务截图