Re: Uber migrated from Postgres to MySQL

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От Greg Sabino Mullane
Тема Re: Uber migrated from Postgres to MySQL
Дата
Msg-id 642ee4228c8c2dd66e299587e52136f0@biglumber.com
обсуждение исходный текст
Ответ на Re: Uber migrated from Postgres to MySQL  (Marc Fournier <marc.fournier@2ndquadrant.com>)
Ответы Re: Uber migrated from Postgres to MySQL  (Bruce Momjian <bruce@momjian.us>)
Re: Uber migrated from Postgres to MySQL  (Jeff Janes <jeff.janes@gmail.com>)
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Marc wrote:
> I donât have a 1TB database to try it on, mind you, so your
> âwait couple of daysâ might be *with* the âlink option?

I think you mean *without*, but yeah, there is no way the --link
option is going to take that long. Hard links are  awesome. We've upgraded
some really big databases, and --link is really, really fast.
If you can't use --link (usually because you want to get over
the checksum hump), we use something like Bucardo to help out.
No need to ever wait a "couple of days" as OP claims. :)

What really bites is the analyze afterwards. That's the part
that takes too long (yes, --in-stages helps some). Would love
to see progress made there.

- --
Greg Sabino Mullane greg@turnstep.com
End Point Corporation http://www.endpoint.com/
PGP Key: 0x14964AC8 201607272220
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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