Re: Adding WHERE clause to pg_dump
От | Joshua D. Drake |
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Тема | Re: Adding WHERE clause to pg_dump |
Дата | |
Msg-id | 1217011588.16378.70.camel@jd-laptop обсуждение исходный текст |
Ответ на | Re: Adding WHERE clause to pg_dump (Simon Riggs <simon@2ndquadrant.com>) |
Ответы |
Re: Adding WHERE clause to pg_dump
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Список | pgsql-hackers |
On Fri, 2008-07-25 at 19:33 +0100, Simon Riggs wrote: > On Fri, 2008-07-25 at 13:31 -0400, Tom Lane wrote: > > Simon Riggs <simon@2ndquadrant.com> writes: > > > Attached patch implements WHERE clauses for pg_dump. > > > > I still have serious reservations about adding such an ugly, > > non-orthogonal wart to pg_dump. Why is it not appropriate to just > > do a COPY (SELECT ...) TO STDOUT when you need this? > > So you can dump a coherent sample database in one command, not 207. > > Every user of PostgreSQL wants a dev/test database. If the database is > large it isn't practical to take a complete copy. Nor is it practical to > hand-write a data sampling extraction program and if you do, its usually > imperfect in many ways. > > Adding this feature gives a very fast capability to create sample > databases, or incremental backups for many cases. Not sure I buy this argument. I am all for usability and I would be the first to shout about the general ridiculousness of pg_dump/all/restore but in this case I think Tom is right. This feature could easily be done in a script without harassing pg_dump. Sincerely, Joshua D. Drake -- The PostgreSQL Company since 1997: http://www.commandprompt.com/ PostgreSQL Community Conference: http://www.postgresqlconference.org/ United States PostgreSQL Association: http://www.postgresql.us/ Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate
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