Worik wrote:
Assuming it is unix The command
ps xau|grep post
You might want to change that to:
ps aux|grep postgres
As your suggestion will pick up extraneous data if one is running
postfix on the same box.
--
Until later, Geoffrey Registered Linux User #108567
Hello,
I am using PostgreSQL 7.4.2 and as I understand NULL values always sort
last.
However, I have a table from which select using two numerical sort keys
FROM and TO. TO might be NULL and I would like to display those
rows first (without sorting the column in descending order).
Is there
select ... order by FROM is not null, FROM;
If you have large amount of rows (with or without nulls) it is faster if
use a partial index.
create index ... on ...(FROM);
create index ... on ...(FROM) where FROM is null;
JLL
[EMAIL PROTECTED] wrote:
Use the coalesce() function. (coalesce returns
Geoffrey [EMAIL PROTECTED] writes:
Worik wrote:
Assuming it is unix The command
ps xau|grep post
You might want to change that to:
ps aux|grep postgres
As your suggestion will pick up extraneous data if one is running
postfix on the same box.
Actually I'd recommend grepping for
Hello Jean-Luc,
You must've been reading my mind. I was just wondering what to do about
indexing on that particular table. I read somewhere that an Index is not
going to improve the performance of an ORDER BY if the sort column
contains NULLs because NULLs aren't indexed?
For the sake of the
On Sun, Sep 19, 2004 at 12:25:00PM -0400, Tom Lane wrote:
ps aux | grep postmaster | grep -v grep
(or use ps -ef if using a SysV-ish ps).
Except that on Solaris, ps -ef _always_ shows postmaster, even for
the individual back ends.
A
--
Andrew Sullivan | [EMAIL PROTECTED]
In the future
T E Schmitz [EMAIL PROTECTED] writes:
You must've been reading my mind. I was just wondering what to do about
indexing on that particular table. I read somewhere that an Index is not
going to improve the performance of an ORDER BY if the sort column
contains NULLs because NULLs aren't
Andrew Sullivan [EMAIL PROTECTED] writes:
On Sun, Sep 19, 2004 at 12:25:00PM -0400, Tom Lane wrote:
ps aux | grep postmaster | grep -v grep
(or use ps -ef if using a SysV-ish ps).
Except that on Solaris, ps -ef _always_ shows postmaster, even for
the individual back ends.
Right, but if you
Hello Tom,
Tom Lane wrote:
T E Schmitz [EMAIL PROTECTED] writes:
I read somewhere that an Index is not
going to improve the performance of an ORDER BY if the sort column
contains NULLs because NULLs aren't indexed?
Whatever you were reading had it pretty badly garbled :-(
I just dug out the
T E Schmitz [EMAIL PROTECTED] writes:
I just dug out the PostgreSQL book again because I thought I might've garbled
it:
Quote: PostgreSQL will not index NULL values. Because an index will never
include NULL values, it cannot be used to satisfy the ORDER BY clause of a
query that returns
T E Schmitz [EMAIL PROTECTED] writes:
Tom Lane wrote:
Whatever you were reading had it pretty badly garbled :-(
I just dug out the PostgreSQL book again because I thought I might've
garbled it:
Quote: PostgreSQL will not index NULL values. Because an index will
never include NULL values,
Hello Greg,
Greg Stark wrote:
T E Schmitz [EMAIL PROTECTED] writes:
Quote: PostgreSQL will not index NULL values. Because an index will never
include NULL values, it cannot be used to satisfy the ORDER BY clause of a
query that returns all rows in a table.
You should just cross out that whole
T E Schmitz [EMAIL PROTECTED] writes:
Greg Stark wrote:
Which book is it?
PostgreSQL by Korry Douglas + Susan Douglas, ISBN 0-7357-1257-3; Feb 2003
Hmm, I've heard of that book but never seen it. The authors are not
participants in the PG community --- AFAICT neither of them have ever
posted
Hello Tom,
Tom Lane wrote:
T E Schmitz [EMAIL PROTECTED] writes:
Greg Stark wrote:
Which book is it?
PostgreSQL by Korry Douglas + Susan Douglas, ISBN 0-7357-1257-3; Feb 2003
Hmm, I've heard of that book but never seen it. The authors are not
participants in the PG community --- AFAICT neither
Jeff Eckermann wrote:
--- Christopher Browne [EMAIL PROTECTED] wrote:
In an attempt to throw the authorities off his
trail, [EMAIL PROTECTED] (Sandeep Gaikwad)
transmitted:
Hello Sir,
I want to know how to check
whether postgres database
is running or not ? when I give command
Tom Lane wrote:
Geoffrey [EMAIL PROTECTED] writes:
Worik wrote:
Assuming it is unix The command
ps xau|grep post
You might want to change that to:
ps aux|grep postgres
As your suggestion will pick up extraneous data if one is running
postfix on the same box.
Actually I'd recommend grepping
On Sun, Sep 19, 2004 at 01:12:07PM -0400, Tom Lane wrote:
Except that on Solaris, ps -ef _always_ shows postmaster, even for
the individual back ends.
Right, but if you see a backend then you can figure the system is up.
Oops, good point. (And in any case, on Solaris you also have the ucb
[snip]
Just to enforce the test is better looking for the entire executable path:
ps aux | grep /usr/bin/postmaster | grep -v grep
Does not work for me!
[EMAIL PROTECTED]:~$ ps aux | grep /usr/bin/postmaster | grep -v grep
[EMAIL PROTECTED]:~$ ps aux | grep postmaster | grep -v grep
Tom Lane [EMAIL PROTECTED] writes:
The paragraph continues:
If the SELECT command included the clause WHERE phone NOT NULL,
PostgreSQL could use the index to satisfy the ORDER BY clause.
An index that covers optional (NOT NULL) columns will not be used to
speed table joins either.
Perhaps I have a bug in pg_ctrl?
This is what I get...
[EMAIL PROTECTED]:~$ ps aux | grep postmaster | grep -v grep
;/usr/lib/postgresql/bin/pg_ctl status
postgres 670 0.0 0.6 8544 1688 pts/1S12:33 0:00
/usr/lib/postgresql/bin/postmaster
pg_ctl: postmaster or postgres is not
Worik [EMAIL PROTECTED] writes:
Perhaps I have a bug in pg_ctrl?
More likely you have the wrong value of PGDATA in your environment
(where wrong means not what that postmaster is using).
regards, tom lane
---(end of
How about a simple
telnet localhost 5432 ?
assuming postmaster is listening on that host and port
On Fri, 17 Sep 2004, Sandeep Gaikwad wrote:
Hello Sir,
I want to know how to check whether postgres database is
running or not ? when I give command like ./postmaster -i , whether
I want to use pgsql to send the command:
Copy sometable from 'sometable.csv';
But only if 'sometable.csv' exists;
If 'sometable.csv' does not exist as an input table I want to continue
the next command.
My full procedure is as follows and any help is greatly appreciated.
Thanks
Richard
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