On 02/17/2017 11:54 PM, Michael Paquier wrote:
On Sat, Feb 18, 2017 at 1:32 PM, Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote:
Yes it can. Truncate has been rollbackable for a while now.
Per the docs:
https://www.postgresql.org/docs/9.6/static/sql-truncate.html
"TRUNCATE is transaction-safe with respect to the data in the tables:
the truncation will be safely rolled back if the surrounding
transaction does not commit."
In short yes a transaction doing a truncate can be rollbacked.
I think the part that confuses people into thinking it can not be
rollbacked is this:
"TRUNCATE is not MVCC-safe. After truncation, the table will appear
empty to concurrent transactions, if they are using a snapshot taken
before the truncation occurred. See Section 13.5 for more details."
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
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