-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Thursday 21 October 2004 12:40 pm, Tom Lane wrote: > "Uwe C. Schroeder" <[EMAIL PROTECTED]> writes: > > I'm just doing a load of database transfers using pg_dump. Because I > > changed the schema of quite some tables I have to dump full column > > inserts. > > I don't think that conclusion follows from that premise. In recent > pg_dump versions (any that use a column list with COPY, which I think is > 7.3 or later) there is no fundamental disadvantage to using COPY; it > should be semantically equivalent to INSERT-with-column-list commands. > > The only reason I can see for using the INSERT option anymore is if you > think that some of the row insertions might fail, and you don't want > that to stop the load altogether. If that's what you want, then you'd > certainly not want to wrap the load in BEGIN/END, so there doesn't seem > to be much point in adding an option to do it. > > regards, tom lane
The reason is that I made changes to the schema, i.e. changed the ordinal position of columns and added some columns. Since the positioning of the columns isn't the same anymore a copy will fail. Column Inserts will leave the new columns untouched (set them to NULL or whatever the default) but can handle the change in order of the columns (ok, the order thing is purely cosmetic...). I see your point that you don't want to fail the whole import when using full inserts - which would happen in a transaction block. My point was basically that I assume all inserts will succeed, however I can't use copy because of the changes but doing it in a transaction will increase the insert speed by at least 10 (chewing up memory certainly). As a remark: normally I make pure data backups as copy and as full column inserts. In case of a recovery I then can easily switch to single inserts if the copy fails - eats a bit more diskspace but increases security (besides the slony replication I'm running on top of that...) Uwe - -- Open Source Solutions 4U, LLC 2570 Fleetwood Drive Phone: +1 650 872 2425 San Bruno, CA 94066 Cell: +1 650 302 2405 United States Fax: +1 650 872 2417 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQFBeDF0jqGXBvRToM4RAmrkAKCoRXnlmnRpp0DI5/cFeCyx97nm1QCfWJ/A 8zSHT4NXzG8LG7GFqpPGSbE= =c99W -----END PGP SIGNATURE----- ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
