Обсуждение: Why is this taking so damn long?
I just added a boolean column to an existing database with 70,000 records.
I then tried to set all the existing columns to true using
update waypoint set ispublic = TRUE;
but it's taken over an hour so far.
Why?
--
Paul Tomblin <ptomblin@xcski.com>, not speaking for anybody
"I have traveled the length and breadth of this country and talked with the
best people, and I can assure you that data processing is a fad that won't
last out the year." --Editor of business books for Prentice Hall, 1957.
On Sat, Apr 28, 2001 at 02:18:42PM -0400, some SMTP stream spewed forth: > I just added a boolean column to an existing database with 70,000 records. > I then tried to set all the existing columns to true using > update waypoint set ispublic = TRUE; > but it's taken over an hour so far. Hm, we need some damn information. :) Is there an index on this column? What version of PostgreSQL are you using? (Not as relevant) Have you vacuum'ed this table lately? Thanks... gh > > Why? > > -- > Paul Tomblin <ptomblin@xcski.com>, not speaking for anybody > "I have traveled the length and breadth of this country and talked with the > best people, and I can assure you that data processing is a fad that won't > last out the year." --Editor of business books for Prentice Hall, 1957. > > ---------------------------(end of broadcast)--------------------------- > TIP 6: Have you searched our list archives? > > http://www.postgresql.org/search.mpl
Quoting GH (grasshacker@over-yonder.net): > On Sat, Apr 28, 2001 at 02:18:42PM -0400, some SMTP stream spewed forth: > > I just added a boolean column to an existing database with 70,000 records. > > I then tried to set all the existing columns to true using > > update waypoint set ispublic = TRUE; > > but it's taken over an hour so far. > > > Hm, we need some damn information. :) > Is there an index on this column? > What version of PostgreSQL are you using? > (Not as relevant) Have you vacuum'ed this table lately? > No, I just added the column, I didn't put an index on it. It's Postgres 6.5. And you're right, I haven't vacuumed it recently. And the update is still running. -- Paul Tomblin <ptomblin@xcski.com>, not speaking for anybody A fool and his money are soon flying more airplane than he can handle.