s. Sometimes simple SSI tests can
show a lot of false positives just because of empty tables or missing
statistics (ANALYZE).
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On Thu, Aug 10, 2017 at 10:26 AM, Thomas Munro
<thomas.mu...@enterprisedb.com> wrote:
> eaten a total of n! member space with an average size of n/2 per
Erm, math fail, not n! but 1 + 2 + ... + n.
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building even larger ones. A thundering
herd of worker processes repeatedly share-locking the same row or
something like that?
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here the race would change the outcome, or some
other serialisation scheme like table or advisory locks.
[1]
https://github.com/postgres/postgres/blob/master/src/backend/executor/README#L297
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for some ideas), but the idea would be
basically the same.
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ub.com/macdice/check_pg_collations
[4]
https://www.postgresql.org/message-id/flat/85364fde-091f-bbc0-fec2-e3ede3984...@2ndquadrant.com
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sed
on Richard Snodgrass's excellent book (which I hear is widely read at
utility companies among others), without any special library support:
http://www.cs.arizona.edu/~rts/tdbbook.pdf
His work influenced the SQL standard which I expect/hope is inspiring
those projects. SQL:2011 has a temporal feat
On Fri, Oct 14, 2016 at 2:04 AM, Kevin Grittner <kgri...@gmail.com> wrote:
> On Wed, Oct 12, 2016 at 8:06 PM, Thomas Munro <thomas.mu...@enterprisedb.com>
> wrote:
>> The "higher isolation levels" probably shouldn't be treated the same way.
>>
>> I
On Thu, Oct 13, 2016 at 2:32 PM, Peter Geoghegan <p...@bowt.ie> wrote:
> On Wed, Oct 12, 2016 at 6:06 PM, Thomas Munro
> <thomas.mu...@enterprisedb.com> wrote:
>> But yeah, the existing code raises false positive serialization
>> failures under SERIALIZABLE, and t
edicate locking code via heap_fetch etc.
[1]
https://www.postgresql.org/message-id/CAEepm%3D2kYCegxp9qMR5TM1X3oXHj16iYzLPj_go52R2R07EvnA%40mail.gmail.com
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action. And as you and Vitaly have said, there is
literally no concurrent update.
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isolation-test.patch
Description: Binary data
check-self-inserted.patch
Description: Binary data
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To
d with avoiding insertion (taking speculative insertion's alternative
* path) on the basis of another tuple that is not visible to MVCC snapshot.
* Check for the need to raise a serialization failure, and do so as necessary.
*/
So it seems to be working as designed. Perhaps someone could arg
.postgresql.org/support/versioning/
>
> Close as I can come is the source version:
>
> https://www.postgresql.org/ftp/source/v8.1.18/
Ancient Red Hat source RPMs are apparently still be available for
archeology projects though:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/S
as "creation" without affecting access
> time.
Apparently some filesystems change the ctime for rename and others
don't, and POSIX tolerates both.
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er 9.5/main. The client library
on the other hand would not be versioned in that way: there would be
just the latest major version's libpq5[2], and that is what other
things like py-psycopg2 etc would depend on (instead of depending on a
specific client major version like postgresql93-client).
[1
p and only gets its hands on
tuples emitted by nodes below it, so if there is a LIMIT then how
could it lock anything outside the limited set of rows that are
returned?
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To make
access due to read/write dependencies
among transactions
DETAIL: Reason code: Canceled on identification as a pivot, during write.
HINT: The transaction might succeed if retried.
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ion
reaches EOL pretty soon:
http://www.postgresql.org/support/versioning/
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m this email:
http://www.postgresql.org/message-id/CAEepm=3z0eolpo5wtuwsem38kbq+gjp8xxiuljkuqpm-sw7...@mail.gmail.com
That used pg_resetxlog -x $XID $PGDATA, but needed to do several hops
stop/pg_resetxlog/start hops to get all the way around the xid clock.
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─┤
└──┘
(0 rows)
postgres=# create unique index dum_unique on dum((dum));
CREATE INDEX
postgres=# insert into dum select;
INSERT 0 1
postgres=# select * from dum;
┌──┐
├──┤
└──┘
(1 row)
postgres=# insert into dum select;
ERROR: duplicate key value violates unique constraint "dum_unique"
DETAIL: Key ((dum.*))=(()) already exists.
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1600
> members, this is normal?
Where did you get 2045 from? I thought it was like this:
number of members = number of member segment files * 1636 * 32
number of multixacts = number of offsets segment files * 2048 * 32
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perfectly when executed
> manually from the shell.
Is this related?
http://www.postgresql.org/message-id/cak7teys9-o4bterbs3xuk2bffnnd55u2sm9j5r2fi7v6bhj...@mail.gmail.com
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xlog.c, which expands to a call to
WalSndWakeup in walsender.c which sets latches (= a mechanism for
waking processes) on all walsenders, and see the WaitLatchOrSocket
calls in walsender.c which wait for that to happen.
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onous
standby's WAL contains the transaction or doesn't contain the
transaction, but not for you to have taken any external action based
on the commit having returned, because it didn't. (If your primary
crashes and restarts before COMMIT returns, and it had got as far as
flushing locally but n
onfigure both of your standbys as synchronous standbys.
Only one of them will actually be a synchronous standby at a time, and
the other one will take over that role if the first one is down, so
your system won't hang but you'll still have the sync standby
guarantee.
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pending on your database
size so you don't want them too often.
3. You could do nothing and wait for autovacuum to detect that you
are using more than half the member address space and trigger a
freeze, which will happen some time after you have around 41k member
segments (occupying around 10GB of
On Thu, Feb 11, 2016 at 11:05 AM, Alvaro Herrera
<alvhe...@2ndquadrant.com> wrote:
> Thomas Munro wrote:
>
>> 4. You could look into whether all those multixacts with many member
>> are really expected. (Large numbers of concurrent FK checks or
>> explicit share
en/postgresql-icu/readme.html
If the goal is to get Unicode collation support, note also that
FreeBSD 11 (due some time this year) supports that in libc.
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will wait just for that one server to report that it has fsync'ed the
WAL. (There is a patch being developed to change that so that you
might be able to wait for more than one in a future release).
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he OID of that collation, you could teach
indxpath.c and (and I don't know what other planner machinery) to
consider that OID to be equivalent to DEFAULT_COLLATION_OID when
comparing them to consider an index path.
There was another email somewhere talking about constraint exclusion's
treatment of explicit and defa
On Tue, Oct 6, 2015 at 12:27 PM, Thomas Munro <thomas.mu...@enterprisedb.com
> wrote:
> On Sun, Oct 4, 2015 at 11:47 PM, Michael Paquier
> <michael.paqu...@gmail.com> wrote:
> > (Seems like you forgot to push the Reply-all button)
> >
> > On Sun, Oct 4, 2015 at
On Thu, Oct 8, 2015 at 12:49 PM, Thomas Munro <thomas.mu...@enterprisedb.com
> wrote:
> On Thu, Oct 8, 2015 at 5:52 AM, Peter Geoghegan
> <peter.geoghega...@gmail.com> wrote:
> > On Wed, Oct 7, 2015 at 6:25 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> >> Th
On Fri, Oct 23, 2015 at 12:33 PM, Dane Foster <studdu...@gmail.com> wrote:
> On Thu, Oct 22, 2015 at 6:54 PM, Thomas Munro
> <thomas.mu...@enterprisedb.com> wrote:
>>
>> On Fri, Oct 23, 2015 at 10:27 AM, Dane Foster <studdu...@gmail.com> wrote:
>> &g
NOT] NULL that has that strange
special case. Other constructs that have special behaviour for NULL
don't consider a composite type composed of NULLs to be NULL. For
example IS DISTINCT FROM, COALESCE, COUNT, STRICT functions.
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will be
set to the first row returned by the query, or to nulls if the query
returned no rows."
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backends). Or at least
tell me that's needed. Obviously completely OS-specific...
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On Thu, Oct 8, 2015 at 1:16 PM, Peter Geoghegan
<peter.geoghega...@gmail.com> wrote:
> On Wed, Oct 7, 2015 at 4:49 PM, Thomas Munro
> <thomas.mu...@enterprisedb.com> wrote:
>>> I agree that that would be almost as bad as carrying on, because there
>>> is no r
nd which in async to avoid a big
>> latency in case of let's say 100 hot standby.
>> it was an idea, a concept to let the master write and update the nodes, like
>> a queen bee ;)
>> but I'm afraid it's not possible, so maybe future version of pg will do it,
>> for now re
On Wed, Jun 17, 2015 at 6:58 AM, Alvaro Herrera
alvhe...@2ndquadrant.com wrote:
Thomas Munro wrote:
Thanks. As mentioned elsewhere in the thread, I discovered that the
same problem exists for page boundaries, with a different error
message. I've tried the attached repro scripts on 9.3.0
On Fri, Jun 5, 2015 at 1:47 PM, Thomas Munro
thomas.mu...@enterprisedb.com wrote:
On Fri, Jun 5, 2015 at 11:47 AM, Thomas Munro
thomas.mu...@enterprisedb.com wrote:
On Fri, Jun 5, 2015 at 9:29 AM, Robert Haas robertmh...@gmail.com wrote:
Here's a new version with some more fixes
On Fri, Jun 5, 2015 at 11:47 AM, Thomas Munro
thomas.mu...@enterprisedb.com wrote:
On Fri, Jun 5, 2015 at 9:29 AM, Robert Haas robertmh...@gmail.com wrote:
Here's a new version with some more fixes and improvements:
- SetOffsetVacuumLimit was failing to set MultiXactState-oldestOffset
when
.
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2048
DETAIL: Could not read from file pg_multixact/offsets/ at
offset 8192: Undefined error: 0.
FATAL: could not access status of transaction 131072
DETAIL: Could not open file pg_multixact/offsets/0002: No such file
or directory.
But, yeah, this isn't the bug we're looking for.
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On Wed, Jun 3, 2015 at 3:42 PM, Alvaro Herrera alvhe...@2ndquadrant.com wrote:
Thomas Munro wrote:
On Tue, Jun 2, 2015 at 9:30 AM, Alvaro Herrera alvhe...@2ndquadrant.com
wrote:
My guess is that the file existed, and perhaps had one or more pages,
but the wanted page doesn't exist, so we
ordering that causes trouble, but I don't yet see why it would break
if you replay the WAL from the backup label checkpoint (and I think
the repro would take days/weeks to run...)
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copy-after-truncation.sh
Description: Bourne shell script
copy-before
we encounter multixacts
in tuple headers (updating, locking or vacuuming). If you have
truncated multixacts referenced in your tuples then you have a
different form of corruption than the
pg_upgrade-tramples-on-oldestMultiXactId case we're trying to handle
gracefully here.
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.
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, filename);
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On 19 March 2013 01:00, Tom Lane t...@sss.pgh.pa.us wrote:
Wasim Arif wasima...@gmail.com writes:
What is the road map for Postgres on the AIX platform? I understand that
the pg build farm contains an AIX 5.3 server; are there any plans to
upgrade to 6.1 and 7.1?
The reason there's an
On 28 March 2013 13:52, Shaun Thomas stho...@optionshouse.com wrote:
On 03/28/2013 07:43 AM, Gavan Schneider wrote:
Personally I have ignored the money type in favour of numeric. Money
seemed to do too much behind the scenes for my taste, but, that's me
being lazy as well, I haven't spend
Hi
I am using 9.1.6, and I've set up a partitioned table as described in the
manual, with partitions based on a timestamptz column called 'time'. The
exclusion constraints work nicely when I select ranges of times with
literal constants. But why would a WHERE clause like the following not
On 25 October 2012 19:46, Boris Epstein borepst...@gmail.com wrote:
And if I want to split the storage - i.e., put databases into different
directories - can I do that?
Take a look at the tablespace feature:
http://www.postgresql.org/docs/current/static/sql-createtablespace.html
You can move
. Locking is an
implementation matter (and the use of FOR UPDATE outside of a
cursor specification, ie in a query specification, may be
non-standard anyway). NOWAIT is not an ANSI SQL keyword, and
WAIT is a keyword reserved for future use.
Regards,
Thomas Munro
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it to be the slowest build farm
member...
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Hi
I noticed that 'avg' works on 'interval', but 'stddev' and 'variance' don't:
hack= create table test (start_time timestamptz, end_time timestamptz);
CREATE TABLE
hack= insert into test values (now(), now() + interval '1 second');
INSERT 0 1`
hack= insert into test values (now(), now() +
Pawel Veselov pawel.vese...@gmail.com wrote:
Hi.
If I have a lot (10k) tables, and each table has a btree index, and all the
tables are being constantly inserted into, would all the indexes have to be
in memory, and would effectively start fighting for space?
Thank you,
Pawel.
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Adrian Klaver adrian.kla...@gmail.com wrote:
On 07/05/2012 07:46 AM, Stefan Schwarzer wrote:
Now, when I launch a query which includes crosstab() as a postgres
user, everything works fine. However, if I launch it as user XXX, it
complaints:
The search path is indicated as:
in a physical range quickly?
(I realise this is a pretty odd thing to want to do... I was
experimenting with a crackpot idea for storing some data in a known
physical order and finding the beginning of ends ranges by binary
chop, instead of using a btree.)
Thanks
Thomas Munro
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Hi
Has anyone done any work on IEEE 754-2008 decimal types for PostgreSQL?
I couldn't find anything, so I was thinking it might be a fun exercise
for learning about extending PostgreSQL with user defined types. My
first goal is to be able to store decimal numbers with a smaller disk
footprint
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