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A comment on Why Uber Engineering Switched from Postgres to MySQL. Parent comment

Re:Why Uber Engineering Switched from Postgres to MySQL by _Codemonkeyism on Tuesday July 26, 2016 @11:17PM (#12170271)
"I wonder how Uber adds an index to a table that already has 1B+ rows in it with mysql?"

"As long as you can shard "

Not sure how sharding helps with 1B+ tables when adding indices, care to share?

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Re:Why Uber Engineering Switched from Postgres to MySQL by Swannie on Wednesday July 27, 2016 @08:06PM (#12177465)
This is: "Split the index in your application code."

And then do your joins, in your application code.

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