Re: [GENERAL] Postgres 10.1 fails to start: server did not start in time

2017-11-12 Thread Christoph Berg
Re: Tom Lane 2017-11-12 <20802.1510513...@sss.pgh.pa.us>
> Agreed, but I think Peter has a point: why is there a timeout at all,
> let alone one as short as 30 seconds?  Since systemd doesn't serialize
> service starts unnecessarily, there seems little value in giving up
> quickly.  And we know that cases such as crash recovery may take more
> than that.

The default systemd timeout seems to be 90s. I have already changed
the systemd timeout to infinity (start) and 1h (stop), so only the
default pg_ctl timeout remains (60s), which I'd rather not override
unilaterally.

https://anonscm.debian.org/cgit/pkg-postgresql/postgresql-common.git/tree/systemd/postgresql@.service#n18

That said, isn't 60s way too small for shutting down larger clusters?
And likewise for starting?

Christoph


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Re: [GENERAL] Postgres 10.1 fails to start: server did not start in time

2017-11-12 Thread Christoph Berg
Re: Peter J. Holzer 2017-11-12 <20171112173559.m6chmbyf4vz6f...@hjp.at>
> Wouldn't it be better to remove the timeout? If some other service
> depends on PostgreSQL it probably shouldn't be startet until PostgreSQL
> is really up and services which don't need PostgreSQL (e.g. SSH or X11
> login or a web- or mail server) shouldn't depend on it.
> 
> One of the purported advantages of systemd over SystemV init is that it
> starts up services in parallel, so a service which takes a long (or
> infinite) time to start doesn't block other services.

If you don't want to block, don't depend on the database service. That
question is independent from the timeout.

Christoph


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Re: [GENERAL] Postgres 10.1 fails to start: server did not start in time

2017-11-12 Thread Christoph Berg
Re: To Adam Brusselback 2017-11-11 
<2017205316.u56lkmkakdmcx...@msg.df7cb.de>
> I'm investigating if it's a good idea to tell systemd to ignore the
> exit code of pg_ctl(cluster).

Telling systemd to ignore ExecStart errors seems to be the correct
solution. The service will still be active, with the startup error
being shown:

● postgresql@10-main.service - PostgreSQL Cluster 10-main
   Loaded: loaded (/lib/systemd/system/postgresql@.service; enabled; vendor 
preset: enabled)
   Active: active (running) since Sun 2017-11-12 13:24:21 CET; 210ms ago
  Process: 31892 ExecStop=/usr/bin/pg_ctlcluster --skip-systemctl-redirect -m 
fast 10-main stop (code=exited, status=0/SUCCESS)
  Process: 31922 ExecStart=/usr/bin/pg_ctlcluster --skip-systemctl-redirect 
10-main start (code=exited, status=1/FAILURE)
 Main PID: 31928 (postgres)
Tasks: 8 (limit: 4915)
   CGroup: /system.slice/system-postgresql.slice/postgresql@10-main.service
   ├─31928 /usr/lib/postgresql/10/bin/postgres -D 
/var/lib/postgresql/10/main -c 
config_file=/etc/postgresql/10/main/postgresql.conf
   ├─31931 postgres: 10/main: checkpointer process
   ├─31932 postgres: 10/main: writer process
   ├─31933 postgres: 10/main: wal writer process
   ├─31934 postgres: 10/main: autovacuum launcher process
   ├─31935 postgres: 10/main: archiver process
   ├─31936 postgres: 10/main: stats collector process
   └─31937 postgres: 10/main: bgworker: logical replication launcher

Nov 12 13:24:20 lehmann systemd[1]: Starting PostgreSQL Cluster 10-main...
Nov 12 13:24:21 lehmann postgresql@10-main[31922]: Error: 
/usr/lib/postgresql/10/bin/pg_ctl /usr/lib/postgresql/10/bin/pg_ctl start -D 
/var/lib/postgresql/10/main -l /var/log/postgresql/postgresql-10-main.log -t 0 
-s -o  -c config_file="/etc/postgresql/10/main/postgresql.conf"  exited with 
status 1:
Nov 12 13:24:21 lehmann postgresql@10-main[31922]: pg_ctl: server did not start 
in time
Nov 12 13:24:21 lehmann systemd[1]: postgresql@10-main.service: PID file 
/var/run/postgresql/10-main.pid not readable (yet?) after start: No such file 
or directory
Nov 12 13:24:21 lehmann systemd[1]: Started PostgreSQL Cluster 10-main.

Fixed in 
https://anonscm.debian.org/cgit/pkg-postgresql/postgresql-common.git/commit/?id=fc57e655c71e8f6bcb3010b054f5adbf32a224d7
 , thanks for the report!

Christoph


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Re: [GENERAL] Postgres 10.1 fails to start: server did not start in time

2017-11-11 Thread Christoph Berg
Re: Adam Brusselback 2017-11-11 

Re: [GENERAL] pg on Debian servers

2017-11-11 Thread Christoph Berg
Re: Magnus Hagander 2017-11-11 

Re: [GENERAL] Postgres 10.1 fails to start: server did not start in time

2017-11-11 Thread Christoph Berg
Re: Tom Lane 2017-11-10 <8027.1510347...@sss.pgh.pa.us>
> > The recovery succeeds, but when I go to start the cluster on the
> > standby, it begins to replay the WAL, and does so for about 30
> > seconds.  Then I get a line in my log saying:
> 
> >> pg_ctl: server did not start in time

Hi Adam,

how did you start the server? Via pg_ctlcluster, the init system, or
directly via pg_ctl?

> > Followed by:
> >> 2017-11-10 20:27:35.907 UTC [7132] LOG:  received smart shutdown request
> >> ERROR [063]: : terminated on signal [SIGTERM]
> 
> ... pg_ctl itself wouldn't decide to forcibly shut down the server
> if the timeout expired.  It merely stops waiting and tells you so.
> It seems like this must represent misdesign of whatever start script
> you're using.  I think you need to complain to the Debian packagers
> about that.

pg_ctlcluster doesn't shut down if startup fails, but to be sure, we'd
need to see the full log of whatever initiated the startup. If you are
using systemd, what does `systemctl status postgresql@10-main` report?
If that doesn't have anything, also check journalctl.

Christoph


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Re: [GENERAL] ERROR: unexpected chunk number 0 (expected 1) for toast value 76753264 in pg_toast_10920100

2017-08-30 Thread Christoph Berg
Re: Harry Ambrose 2017-08-25 

> Hi All,
> 
> Sorry to open this can of worms again. However, we are still struggling
> with this issue across quite a large amount of our estate.

Hi,

we've just seen exactly this error on a customer database running
9.5.3 (postgresql95.x86_64 9.5.3-2PGDG.rhel6). Luckily just one tuple
was affected.

Symptoms were:
# select text from k... where id = 719764749;
ERROR:  unexpected chunk number 0 (expected 1) for toast value 3347468184 in 
pg_toast_922511637
The toast table itself was perfectly ok, with a single chunk:
# select * from pg_toast.pg_toast_922511637 where chunk_id = 3347468184;
chunk_id   | 3347468184
chunk_seq  | 0
chunk_data | ...valid text string... (with bytea_output = 'escape')

Updating or deleting the field/row didn't work:
# update k... set text = '...same text as above...' where id = 719764749;
ERROR:  XX000: tuple concurrently updated
ORT:  simple_heap_delete, heapam.c:3171

# delete from k... where id = 719764749;
ERROR:  XX000: tuple concurrently updated
ORT:  simple_heap_delete, heapam.c:3171

The problem persisted over the last two weeks (eventually noticed by
pg_dump starting to fail between August 15th and 18th). The server was
started on July 26th.

Besides the ERRORing statements above, I didn't actively resolve it,
suddenly SELECTing the original row just worked again. According to
pg_stat_user_tables, autovacuum didn't hit in. I can't say if there
were backends open for two weeks. At the time it resolved itself, the
oldest backend was from August 27th.

If xmin/xmax/multixact... data from this server is interesting, I can
extract it on request.

Christoph


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Re: [GENERAL] Where is pg_hba.conf

2017-08-13 Thread Christoph Berg
Re: Igor Korot 2017-08-13 

> draft=# SHOW hba_file
> draft-# SHOW hba_file;
>  ERROR:  syntax error at or near "SHOW"
> LINE 2: SHOW hba_file;
> ^

Standard beginners error. If you forgot the ";" on the first line,
it'll process both lines as a single, erroneous command. Note the
"-#" prompt.

If you run into that situation again, hit ^C.

Christoph


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Re: [GENERAL] Where is pg_hba.conf

2017-08-13 Thread Christoph Berg
Re: Igor Korot 2017-08-13 

> I need to modify the pg_hba.conf file to get access to the DB
> remotely.
> 
> However, I can't find this file anywhere on the system.

Try "SHOW hba_file;".

Christoph


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Re: [GENERAL] A change in the Debian install

2017-04-07 Thread Christoph Berg
Re: Magnus Hagander 2017-04-06 

> On Thu, Apr 6, 2017 at 3:46 PM, Stephen Frost  wrote:
> 
> > * Tom Lane (t...@sss.pgh.pa.us) wrote:
> > > (But ... these statements are based on an assumption of out-of-the-
> > > box Postgres behavior.  I would not exactly put it past the Debian
> > > packagers to have decided to change this for reasons of their own,
> > > and their track record of telling us about such decisions is many
> > > miles south of abysmal.  So you might look at whatever patches
> > > are in the Debian package to see if there's anything touching
> > > pgstat.c's socket-setup logic.)
> >
> > I don't believe this is really a fair assessment.  Maybe at some point
> > in the distant past, but not today.  Christoph is regularly on this list
> > contributing to threads regarding packaging, submitting patches of his
> > own for improvements to PG, and the patches currently included in the
> > Debian distribution, at least mostly, are for things which really should
> > be possible to do with configure options, but which we don't provide
> > today, or things we should just be handling already.
> >
> 
> +1. While this may have been true in a *very* distant past, it's certainly
> not anymore. So let's try to avoid spreading disinformation about that.
> 
> And FWIW, the RPM distributions have about the same number of patches...

Thanks Stephen and Magnus. I don't think the way Martin and I have
been handling the Debian packages over the last year deserves being
bashed that loudly. At least I would expect a Cc on such matters, Tom
should know very well whom to address here.

> > 51-default-sockets-in-var.patch
> >   Use /var/run/postgresql/ for the DEFAULT_PGSOCKET_DIR.  We really
> >   should allow this to be changed in configure.
> 
> This looks exactly like something the RPMs want as well, so we should
> definitely look at providing that upstream.

That one is touching src/include/pg_config_manual.h only, i.e.
something that is actually meant to be altered.

https://anonscm.debian.org/cgit/pkg-postgresql/postgresql.git/tree/debian/patches/51-default-sockets-in-var.patch?h=10

> I'll start a discussion with Christoph on if we might, already, be able
> > to remove some of these, and where we might be able to make upstream
> > changes to remove the need for others.
> 
> That'd be useful. I think you should also include Devrim to figure out what
> things would actually make *both* sides happier.

Aye.


Re: Stephen Frost 2017-04-06 <20170406134629.gt9...@tamriel.snowman.net>
> The non-comment/documentation patches include for the Debian PG 9.6
> packages are:
> 
> 50-per-version-dirs.patch
>   Use version specific installation directories so that several major
>   versions can be installed in parallel.  This includes changing
>   pkglibdir and includedir_server.  Those might be able to be set
>   through existing configure flags and that's probably something we
>   could work with Christoph to do.

Nod. If someone figures how to translate that to configure (or
possibly make) arguments, I'd be happy to move to using that.

>   There's also a change to pg_config
>   which might be a bit more difficult to handle in upstream (related to
>   how pg_config ends up in /usr/bin, but that isn't the "right" BINDIR).

pg_config is special there, because we ship it twice, once in
/usr/bin/ libpq-dev, and then again in
/usr/lib/postgresql/$version/bin/ from postgresql-server-dev-version.
Not sure if there's a saner approach that still allows co-installation
of multiple versions, while still supplying a pg_config from libpq-dev
that allows using --includedir and other version-independent queries.

https://anonscm.debian.org/cgit/pkg-postgresql/postgresql.git/tree/debian/patches/50-per-version-dirs.patch?h=10

> 54-debian-alternatives-for-external-tools.patch
>   Use 'sensible-editor' for DEFAULT_EDITOR, and 'pager' for
>   DEFAULT_PAGER.  These could also be done through configure switches, I
>   would think.

https://anonscm.debian.org/cgit/pkg-postgresql/postgresql.git/tree/debian/patches/54-debian-alternatives-for-external-tools.patch?h=10

> 64-pg_upgrade-sockdir
>   This is a bit of a curious one, the description is:
>   Fix for: connection to database failed: Unix-domain socket path
>   
> "/build/buildd-postgresql-9.3_9.3~beta1-1-i386-mHjRUH/postgresql-9.3-9.3~beta1/build/contrib/pg_upgrade/.s.PGSQL.50432"
>   is too long (maximum 107 bytes)
> 
>   See also: http://lists.debian.org/debian-wb-team/2013/05/msg00015.html
> 
>   This basically adds a mechanism to fall back to using /tmp if the
>   socket path is too long.  Would probably be good to figure out a
>   better way.

That one is actually on my TODO list:
https://www.postgresql.org/message-id/20140711094009.GB3115%40msg.df7cb.de
I'll need to restart working on it.

https://anonscm.debian.org/cgit/pkg-postgresql/postgresql.git/tree/debian/patches/64-pg_upgrade-sockdir?h=10

Re: [GENERAL] could not connect to server

2016-10-16 Thread Christoph Berg
Re: Antonio Silva 2016-10-16 

> 2016-10-15 06:15:20 BRT [995-1] FATAL:  data directory
> "/var/lib/postgresql/9.5/main" has group or world access
> 2016-10-15 06:15:20 BRT [995-2] DETAIL:  Permissions should be u=rwx (0700).
> 
> The problem with permissions was already indicated to  .pgpass

Hi,

upgrades do not modify data directory permissions. Something or
someone must have modified that manually. And given it also happened
to your home directory, that might have affected the whole system...

Christoph


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Re: [GENERAL] PGDATA / data_directory

2016-09-07 Thread Christoph Berg
Re: Jehan-Guillaume de Rorthais 2016-09-07 <20160907140816.3e13eaa3@firost>
> Indeed. I never noticed data_directory was set in postgresql.conf file...
> 
> But then, why starting PostgreSQL with the following command ?
> 
>   /usr/lib/postgresql/9.4/bin/postgres -D /var/lib/postgresql/9.4/main \
> -c config_file=/etc/postgresql/9.4/main/postgresql.conf
> 
> It seems the following one work as expected and seems more logical with this
> setup:
> 
>   /usr/lib/postgresql/9.4/bin/postgres -D /etc/postgresql/9.4/main/

TBH, I've been wondering about that myself, but never bothered to to
anything about it. Digging in the (now git) history, it's been like
that from the very beginning in 2005:

https://anonscm.debian.org/cgit/pkg-postgresql/postgresql-common.git/commit/?id=9fa563e78366db3b27d680607c202b6fbb00bef2

It got touched a bit when 8.0 support was added, but basically not
changed since then.

https://anonscm.debian.org/cgit/pkg-postgresql/postgresql-common.git/commit/?id=fecbaad06c3683452228d31c0baffb01ba626a9a

I'll see if I can simply remove it. Thanks for the suggestion.

Christoph


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Re: [GENERAL] PGDATA / data_directory

2016-09-04 Thread Christoph Berg
Re: Benoit Lobréau 2016-08-31 

Re: [GENERAL] Ubuntu/Debian PGDP

2016-05-09 Thread Christoph Berg
Re: Peter Eisentraut 2016-05-07 
<6f86345a-0658-2cd9-27d9-c381846eb...@2ndquadrant.com>
> On 5/7/16 2:43 AM, Vincenzo Romano wrote:
> > In a fresh new install of PostgreSQL 9.5.2 on Ubuntu 16.04 I am getting 
> > this:
> > 
> > ...
> > Setting up postgresql-9.5 (9.5.2-1.pgdg16.04+1) ...
> > Unescaped left brace in regex is deprecated, passed through in regex;
> > marked by <-- HERE in m/(? > /usr/sbin/pam_getenv line 78.
> 
> This issue is known and being worked on.  It's only a deprecation warning,
> so you can ignore it for now.

Furthermore, it's not even a bug in PostgreSQL, it's a warning from
pam_getenv which is used in the setup scripts.

Christoph


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Re: [GENERAL] Really unique session ID - PID + connection timestamp?

2016-04-09 Thread Christoph Berg
Re: Stephen Frost 2016-04-09 <20160409115712.gt10...@tamriel.snowman.net>
> > Btw, what you are describing is exactly what %c in log_line_prefix
> > does.
> 
> That's not currently exposed at an SQL level anywhere though, is it?
> Perhaps we should add a way to get that.  Another thought would be to
> essentially expose 'log_line_prefix()' at the SQL level but I'm not sure
> that generally makes sense.  We could also have an explicit function to
> get MyStartTime, similar to pg_backend_pid().

I don't see how log_line_prefix() would make sense, but
pg_session_identifier() (= %c) would make sense to have, in the same
way that we have pg_backend_pid(), so the current session could be
located in the logs. (Not sure if pg_session_identifier shouldn't also
be a pg_stat_activity column, but that might be overkill. Maybe
SELECT pg_session_identifier(pid) from pg_stat_activity; ?)

MyStartTime is probably too specific.

Christoph


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Re: [GENERAL] Really unique session ID - PID + connection timestamp?

2016-04-09 Thread Christoph Berg
Re: Durumdara 2016-04-09 

> In MS the session id is smallint, so it can repeats after server restarts,
> but my coll. found a "session creation timestamp".
> This is a key which unique.
> With this we can check for died sessions and we can clean their records.
> 
> We want create same mechanism.
> I know there are adv. locks in PG, but I want to use session id.
> 
> This could be:
> pg_backend_pid()
> 
> May pid repeats.
> Where I can get timestamp or some other unique data with I can create a
> combined primary key?

Btw, what you are describing is exactly what %c in log_line_prefix
does.

Christoph


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Re: [GENERAL] Running pg_upgrade under Debian

2015-04-24 Thread Christoph Berg
Re: Peter Eisentraut 2015-04-24 553a3b85.1070...@gmx.net
 On 4/20/15 6:09 PM, Bruce Momjian wrote:
  On Mon, Apr 20, 2015 at 07:06:37PM -0300, Alvaro Herrera wrote:
  ISTM there's a documentation bug here: in the code, the dump method
  checks for tablespaces and raises an error if they are found, but the
  upgrade method does not check.  I think the documentation should state
  that only the dump method does not support tablespaces.
  
  OK, it would be nice if someone could report that to upstream Debian.  I
  am a little confused why pg_dump/pg_restore can't use tablespaces
  though.  Years ago we used to not use PG-major-version-specific
  subdirectories in tablespaces, but we added that for pg_upgrade, and I
  am sure they would work fine for pg_dump too.
 
 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=772202

Yeah I know, it's on the extended TODO list...

Christoph
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Re: [GENERAL] Best filesystem for a high load db

2014-11-25 Thread Christoph Berg
Re: Bill Moran 2014-11-25 
20141125111630.d05d58a9eb083c7cf80ed...@potentialtech.com
 Anything with a journal is a performance problem. PostgreSQL effectivly
 does its own journalling with the WAL logs. That's not to say that there's
 no value to crash recovery to having a journalling filesystem, but it's
 just to say that our experience showed journaling filesystems to be slower.
 That rules out ext4, unless you disable the journal. I seem to remember
 ext4 with journalling disabled being one of the faster filesystems, but I
 could be remembering wrong.

If you are using a non-journalling FS, you'll be waiting for a full
fsck after a system crash. Not sure that's an improvement.

Christoph
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Re: [GENERAL] Alternative to psql -c ?

2014-06-25 Thread Christoph Berg
Re: James Le Cuirot 2014-06-25 20140625144325.49d1124d@red.yakaraplc.local
 Hello,
 
 I've been using the Chef database cookbook and found it
 frustrating because it doesn't allow you to use peer
 authentication. The client process generally runs as root and
 connects to PostgreSQL using the Ruby pg gem.
 
 I have patched it to shell out to psql instead. This has the

No idea on the psql -c part, but I'd try using the pg gem, and use a
.pgpass file along with md5 authentication. If you set the PGHOST env
var (or PGUSER, PGSERVICE, ...), you don't even need to change any
code for that to work with the usual PG default configs.

Christoph
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Re: [GENERAL] Query runs forever after upgrading to 9.3

2013-09-23 Thread Christoph Berg
Re: Andrus 2013-09-23 E04C65FDEE80430DB6499621E2EC36BC@dell2
 SELECT * FROM toode
 WHERE toode in (SELECT toode FROM tempkaive)
 OR toode in (SELECT toode FROM tempalgsemu)

Generally, WHERE IN (SELECT) should be rewritten as WHERE EXISTS
(SELECT):

SELECT * FROM toode o
WHERE EXISTS (SELECT toode FROM tempkaive i WHERE o.toode = i.toode)
OR EXISTS (SELECT toode FROM tempalgsemu i WHERE o.toode = i.toode)

Also, ANALYZEing the tables after the upgrade might help if this has
not yet been done.

Christoph
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Re: [GENERAL] Why are there no inequality scans for ctid?

2013-06-28 Thread Christoph Berg
Re: hubert depesz lubaczewski 2013-06-28 20130628085246.ga25...@depesz.com
 On Fri, Jun 28, 2013 at 02:21:10PM +0530, Atri Sharma wrote:
  How would this be helpful for general use cases? Querying on tids on a
  specific page doesn't seem too useful for any other case than the one
  you mentioned above, and IMHO it seems to be the job of vacuum.
  I may be missing something here though.
 
 Vacuum doesn't move rows around (as far as I can tell by running vacuum
 ~ 100 times on bloated table).
 
 And as for general case - sure. It's not really useful aside from bloat
 removal, but I think that bloat removal is important enough to warrant
 some help from Pg.

It would also be useful for querying broken tables where you SELECT *
FROM badtable WHERE ctid  '(123,0)'; to avoid dying on a bad block.

Christoph
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Re: [GENERAL] postgresql command line exploit found in the wild

2013-04-09 Thread Christoph Berg
Re: Daniel Verite 2013-04-08 cd81d201-e9fa-4567-ac49-e3e762935747@mm
   Merlin Moncure wrote:
 
  if you have an internet facing database, patch it immediately!
 
 By the way:
 
 People running 9.1 on debian stable (squeeze) typically use this package:
 http://packages.debian.org/squeeze-backports/postgresql-9.1
 
 Currently, it looks like the fix is only available in pre-compiled form for
 the amd64 architecture (see the bottom of the page). All other archs
 including the popular i386 are stuck at version: 9.1.7-1~bpo60+1

This is just packages.debian.org lagging behind. The packages were
available on Thursday. (Excluding i386/armel.) Look at the timestamps
on http://backports.debian.org/debian-backports/pool/main/p/postgresql-9.1/ .

 I find it problematic. One can always switch to the new apt.postgresql.org
 repository that has the latest versions, but how many people are going to not
 even notice the problem, trusting their normal upgrade path?

I'm poking the backports people to throw more resources on building
packages there.

Christoph
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c...@df7cb.de | http://www.df7cb.de/


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Re: [GENERAL] Moving some of Postgres off a SSD

2012-12-18 Thread Christoph Berg
Re: Robert James 2012-12-18 
CAGYyBgiA8G5pqjfqrPqvAuo=iodeftfbl6spa187zfop+h6...@mail.gmail.com
 I have Postgres running on a SSD.  The data is now almost 50GB, which
 is filling up the drive.
 
 How can I move some of the data to my HDD?

Use a TABLESPACE.

Christoph
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c...@df7cb.de | http://www.df7cb.de/


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