| From: | Kevin Grittner <kgrittn(at)ymail(dot)com> |
|---|---|
| To: | Peter Eisentraut <peter_e(at)gmx(dot)net>, Greg Stark <stark(at)mit(dot)edu> |
| Cc: | Noah Misch <noah(at)leadboat(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Marko Tiikkaja <pgmail(at)joh(dot)to>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Materialized views WIP patch |
| Date: | 2013-02-21 14:25:50 |
| Message-ID: | 1361456750.11476.YahooMailNeo@web162902.mail.bf1.yahoo.com |
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| Lists: | pgsql-committers pgsql-hackers |
Peter Eisentraut <peter_e(at)gmx(dot)net> wrote:
> On 2/20/13 11:14 PM, Greg Stark wrote:
>> That's not entirely true. From the database's point of view,
>> TRUNCATE is in many ways actually DDL.
>
> Whether something is DDL or DML or a read operation (query) is
> not an implementation detail, it's a user-exposed category.
> Since TRUNCATE is logically equivalent to DELETE, it's a DML
> operation, as far as the user is concerned.
Not really. It doesn't follow the same MVCC behavior as DML. This
is user-visible, documented behavior.
--
Kevin Grittner
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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