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help / color / mirror / Atom feedFrom: Michael Paquier <[email protected]>
To: Tom Lane <[email protected]>
Cc: [email protected]
Cc: [email protected]
Subject: Re: What does "Table rewrite" mean?
Date: Sat, 20 Jan 2018 19:18:07 +0900
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
<[email protected]>
On Fri, Jan 19, 2018 at 11:33:43AM -0500, Tom Lane wrote:
> It means reading the whole table and writing it out in some modified
> form (for instance, with some column transformed into a new datatype).
> It's not "dangerous" in any way ... but if you've got many GB of data in
> the table and you can't afford to have the table locked for a long time,
> then it's something to avoid.
Yeah that can be costly. Note that WAL corresponding to this data needs
to be generated as well.
--
Michael
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Subject: Re: What does "Table rewrite" mean?
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