On Fri, Mar 29, 2019 at 08:48:03AM -0700, Andres Freund wrote: > Yes, it increases the total runtime quite considerably. And it adds new > failure modes with partially built invalid indexes hanging around that > need to be dropped manually.
On top of that CONCURRENTLY needs multiple transactions to perform its different phases for each transaction: build, validation, swap and cleanup. So it cannot run in a transaction block. Having a separate option makes the most sense. > It does at *least* twice as much IO. Yeah, I can guarantee you that it is much slower, at the advantage of being lock-free. -- Michael
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