Re: [GENERAL] psql seems to hang during delete query

[surabhi.ahuja]

so how much space should be free so that i am able to delete

 

i have a hard disk of size 130 G.

 

 

thanks,

regards

Surabhi

---

From: Harald Armin Massa [mailto:[EMAIL PROTECTED]
Sent: Thu 7/20/2006 12:16 PM
To: surabhi.ahuja
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] psql seems to hang during delete query

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You can't delete from a full disk :)

No, really: database systems need space for logging, WAL, whatever.

And even with "delete" PostgreSQL will free no single byte, as deleting is done with marking the row as deleted. Read up on multi version concurrency why this has to be that way.

To reclaim space: vacuum freeze

So, to get space, you have to have space first. Delete something else.

Harald

On 7/20/06, surabhi.ahuja <[EMAIL PROTECTED]> wrote:

i am using postgresql 8.0.0

 

my disk is 100% full

 

i have a database called x

 

i do the following

psql x

delete from table;

 

 

nothing happens

 

i try to see the top output

 

i see the following

1768 sdc       25   0 41860  32m  30m R 99.7  0.8  11:29.35 postmaster
i also saw this appearing

 

 2525 root      16   0  7296  720  620 S  0.3  0.0   0:07.62 hald-addon-stor

 

its been almost half an hour

and the database is still in the same state. (all the rows still exist)

 

what is happening?

hasnt it started deleteing yet?

postgreslog dont say anything.

 

what can be done in such a case?

thanks,

regards

Surabhi

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