estimate as well as the estimated upper and lower error
margin for the estimate. An estimate of 827 +0 -400 could have very
different meaning than an estimate of [427,827].
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Data
d) be
automated though, which is computing these statistics for all foreign
keys. We can have a way to disable that for specific keys if necessary,
but I'd bet it's extremely rare to have a FK that you never join on.
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Exp
. which I
suspect would make any such "type" all but unusable. The other problem
would be having it deal with any other data type, but at least there's
ways you can work around that for the most part.
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happens to contain a COMMIT, you're hosed. I can see some use for a
"must rollback" mode of BEGIN.
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ot; of BRIN index(es) occurs, avoiding a call to
lazy_vacuum_heap(), just as when there are no indexes on the table
whatsoever?
ISTM the big question here is how vacuum would know it can skip this
since we wouldn't want to hard-code this for BRIN.
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On 11/2/15 5:46 PM, David Fetter wrote:
I'd like to add weighted statistics to PostgreSQL
Anything happen with this? If community isn't interested, ISTM it'd be
good to put this in PGXN.
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Experts in Analytics, Da
it into a commitfest?
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To make changes to your
re than just one GUC, and I agree with that, and I'm willing
to investigate when the current compat GUCs went in and create a patch
to remove the really old ones. My inclination would be to just do this
as part of 10.0. (And I agree with Robert's comments about parallel
being the most
g.
(Doing a single bulk insert to the index at the end of an INSERT should
be safe though because none of those tuples are visible yet, though I'd
have to make sure your backend didn't try to use the index for anything
while the command was running... like as part of a trigger
was a version that would expand 4 byte varlena to 8 byte as needed.
And we're not painting ourselves in the corner - if we decide to
increase the varlena header size in the future, this patch does not make
it any more complicated.
True.
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On 12/16/15 6:01 PM, Robert Haas wrote:
On Tue, Dec 15, 2015 at 1:26 AM, Michael Paquier
wrote:
On Tue, Dec 15, 2015 at 2:57 AM, Jim Nasby wrote:
On 12/11/15 2:57 PM, Tom Lane wrote:
Jim Nasby writes:
Perhaps, but I'd like to have a less ad-hoc process about it. What's
our
me set of queries you can test
against and call it good.
FWIW, I also don't see the use case for disabling maintenance on an
index. Just drop it and if you know you'll want to recreate it squirrel
away pg_get_indexdef() before you do.
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Jim Nasby, Data Architect, Blue Treble
y issues would be if done in
the server. Maybe they wouldn't be that bad. I suspect the audience for
this code would be much larger if it was in the server as opposed to a C
library.
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y, I think this is actually a good luck sign. ;P
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been a large amount of deletes;
I'll check with them tomorrow.
IMHO we need to change the messages so they are explicit about line
pointers vs actual tuples. Trying to obfuscate that just leads to
confusion. heap_page_prune needs to report only non-rootlp tuples that
were pruned. (None
TOAST then maybe that's enough.
The other thing this might buy us are a few bits that could be used to
support Datum versioning for other purposes, such as when the binary
format of something changes. I would think that at some point we'll need
that for pg_upgrade.
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Jim Nasby, Data Ar
On 12/11/15 2:57 PM, Tom Lane wrote:
Jim Nasby writes:
A quick doc search indicates this config was created in 9.0, though the
docs state it's for a change that happened in 8.2[1].
Don't know what you're looking at, but the GUC is definitely there (and
documented) in 8.2.
On 12/11/15 6:25 PM, Jim Nasby wrote:
On 12/10/15 7:09 PM, Tom Lane wrote:
Jim Nasby writes:
AFAICT the problem is that missing wasn't included in install or
uninstall in config/Makefile. Attached patch fixes that, and results in
missing being properly installed in lib/pgxs/config
On 12/10/15 7:09 PM, Tom Lane wrote:
Jim Nasby writes:
AFAICT the problem is that missing wasn't included in install or
uninstall in config/Makefile. Attached patch fixes that, and results in
missing being properly installed in lib/pgxs/config.
I thought we'd more or less rej
On 12/10/15 7:03 PM, Tom Lane wrote:
Jim Nasby writes:
Is there any reason we couldn't/shouldn't support IS DISTINCT in
subquery_Op? (Or really, just add support to ANY()/ALL()/(SELECT ...)?)
It's not an operator (in the sense of something with a pg_operator OID),
which mean
onfig-compatible.html
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To make changes to your subscription:
Is there any reason we couldn't/shouldn't support IS DISTINCT in
subquery_Op? (Or really, just add support to ANY()/ALL()/(SELECT ...)?)
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search and repalace arrays instead of Datums?
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To
ninstall in config/Makefile. Attached patch fixes that, and results in
missing being properly installed in lib/pgxs/config.
Forwarded Message
Subject: [GENERAL] pgxs/config/missing is... missing
Date: Wed, 28 Oct 2015 12:54:54 -0500
From: Jim Nasby
To: pgsql-general
CC:
that ever gets built it might be useful for what you
propose as well.
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that we're willing to add
the brawn, but we're not willing to add the brain. If this is the case
then it's a shame, as I think we can have both. So I very much agree on
the fact that we must find a way to maintain support and high
performance of small OLTP databases too.
+1
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Jim
On 12/8/15 1:36 PM, Robert Haas wrote:
Your point is also valid, so I don't mean to detract from that. But
the status quo is definitely annoying.
+1, and I even use -S.
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practical
that would be.
Maybe a better starting point would be a planner timeout.
I definitely agree we need some method to limit planning time when
necessary (ie: OLTP). Without that we'll never be able to start testing
more complex optimizations.
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On 12/7/15 9:54 AM, Tom Lane wrote:
Jim Nasby writes:
>On 12/6/15 10:38 AM, Tom Lane wrote:
>>I said "in most cases". You can find example cases to support almost any
>>weird planner optimization no matter how expensive and single-purpose;
>>but that is the wro
if there was a fast, easy way to figure out
whether a query would be expensive enough to go the whole 9 yards on
planning it but at this point I suspect a simple GUC would be a big
improvement.
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ce to fix that, but that's mostly a
separate matter.
Though, it would probably be nice if all of this stuff (along with the
regprocedure input function) could be factored into a single piece of
code...
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Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
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them. If we do this, I think we need to change both places
that are affected, so ResourceOwnerCreate() in resowner.c would
need a line or two added.
ResourceOwnerCreate() sets ResourceOwnerData.nextchild, not
MemoryContextData.nextchild.
Anything ever happen with this?
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On 12/4/15 5:14 PM, Peter Geoghegan wrote:
On Fri, Dec 4, 2015 at 2:44 PM, Jim Nasby wrote:
>I suspect Cachegrind[1] would answer a lot of these questions (though I've
>never actually used it). I can't get postgres to run under valgrind on my
>laptop, but maybe someone tha
sed it). I can't get postgres to run under valgrind
on my laptop, but maybe someone that's been successful at valgrind can
try cachegrind (It's just another mode of valgrind).
[1] http://valgrind.org/docs/manual/cg-manual.html
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;s a PITA to cut and paste
the whole argument list into multiple REVOKE/GRANT/COMMENT on
statements. Even worse, not all the options of CREATE FUNCTION are
supported in those other commands, so often you can't even just cut and
paste.
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Jim Nasby, Data Architect, Blue Treble Consulting, Au
On 11/15/15 7:37 PM, Peter Eisentraut wrote:
On 11/15/15 3:20 PM, Jim Nasby wrote:
As to the argument about displaying a check or an X, why should that
capability only exist for boolean types? For example, why not allow psql
to convert a numeric value into a bar of varying sizes? I&#x
On 11/24/15 10:57 PM, Pavel Stehule wrote:
+errmsg("parameter \"%s\" isn't valid size value",
Should read " isn't a valid size value"
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On 11/24/15 7:46 PM, Peter Geoghegan wrote:
On Tue, Nov 24, 2015 at 5:39 PM, Jim Nasby wrote:
Another not-uncommon case is IN ( '1', '2', ... , '2342' ); in other words,
treating an integer as text. A lot of frameworks like to do that and just
push the problem o
compares to reltuples/relpages from pg_class for the
heap... but I suspect that's pretty serious overkill.
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se..
Since there's a few different things people might want, maybe a good
first step is to allow extending/changing the jumbling decision at the C
level. That would make it easy for a knowledgeable enough person to come
up with an alternative as a plugin that regular users could use.
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Jim N
nly scan of 10% of data instead of scanning and sorting the
full table.
There are other cases where you'd want to build an index off an existing
index as well. It's not that uncommon to have small, specialized indexes
that are fully or partially a subset of another index.
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Jim Nasby, D
reading an index
could keep a number of children busy retrieving heap tuples and
processing them. It might be nice if an index scan node just fired up
it's own workers and talked to them directly.
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it might be worth it to allow index AMs to provide
their own vacuuming feedback, but I think that's way out of scope for
this patch. :)
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' too
(or prettysize?). No reason it has to be tied to bytes (in particular
this would work for bits too).
If we're going to add this, I suppose it should support the 'i prefixes'
too (GiB, MiB, etc).
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Experts i
relation, because if you can't
actually shrink the heap you're not going to make any progress.
But since none of this will help at all in the default case where WAL is
on the same filesystem as the data, I don't know that it's worth it.
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manual vacuum, unless there was a LOGTIME option added to vacuum as well.
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On 11/22/15 2:11 PM, Pavel Stehule wrote:
What about pg_size(text), pg_size(value bigint, unit text) ?
I like, though I'd make it numeric or float. pg_size(3.5, 'GB')
certainly seems like a reasonable use case...
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On 11/22/15 11:34 AM, Marko Tiikkaja wrote:
On 2015-11-22 18:29, Jim Nasby wrote:
Only if you know how many columns there already are.
Or does this not work if you hand it a row?
It "works" in the sense that it tells you whether the row is NULL or
not. I.e. the answer will always
g_size_pretty(text)?
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To make changes to your
On 11/20/15 11:55 PM, Marko Tiikkaja wrote:
On 2015-11-21 06:52, Jim Nasby wrote:
On 11/20/15 11:12 PM, Marko Tiikkaja wrote:
On 2015-11-21 06:02, I wrote:
Here's a patch implementing this under the name num_nulls(). For
January's CF, of course.
I forgot to update the some ref
On 11/19/15 10:47 AM, Jaime Casanova wrote:
- only superusers?
I would think the owner of the table (index?) should also be able to run
this.
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o be a not-null equivalent as well? I've
definitely wanted both variations in the past.
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Presumably that's going to be a lot more expensive than an increment
operation.
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re we don't have to worry about random output changes,
like what line number on a script caused an error?
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could be reported for
the same. Note that, it would have to be reported from lazy_vacuum_rel().
ISTM this is similar to the problem of reporting index status, namely
that a progress reporting method needs to accept reports from multiple
places in the code.
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g benefits to tap is not dealing with raw psql output...
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e the title originally
sought?
Basically, it follows the same pattern that all-visible bits do, except
instead of indicating a page is all-visible, the bit shows that all
tuples on the page are frozen. That allows a scan_all vacuum to skip
those pages.
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y isn't a normal number.
My specific fear is that now people will have to do a bunch of IF
timestamp IS NOT NULL THEN ... to get the behavior they need.
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Data in Tro
On 11/15/15 10:56 PM, dinesh kumar wrote:
So, shall we make this pg_report_log TO pg_write_log OR pg_ereport OR
from you.
Why not pg_raise to mirror plpgsql? (The function does have the same
semantics, right? It's not doing something like only sending to the log
and not the client?)
-
hat you've just written, which means the data's still in
shared buffers.
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CT repeat( '*', blah * 30 /
max_of_blah ). I'm sure there's other examples people could think of.
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his is a common point of confusion.
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To make
l for ditching variable start, full stop.
Since the start-pos is recorded in the array, I wonder if it's worth
supporting negative indexing for arrays with the default 1-indexed
element numbering, and just ERRORing for others. Does anyone really
use anything else?
I'd prefer that over us
's a start. Barring that, at least
Even then it would be very easy to mess this up.
warnings tend to stand out in the database log.
That depends greatly on how much other stuff is in the log. Something
else I wish we had was the ability to send different log output to
different pla
ch like to drive that column out
of main and into toast. I think target_tuple_size would let me do
that.
+1 on having a way to induce that behavior, as I've faced the same thing
in the past.
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they're
using transactions, but short of that this is the next best thing.
Actually, one other thing that would help is to have the ability to turn
this into an ERROR:
begin;
WARNING: there is already a transaction in progress
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raw asciidoctor. ;)
Great work on this!
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To make
e of pg_regress itself. Would that mostly suffice
for what you're looking for?
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test to
pgbench or may be use some test which adheres to TPC-C specification.
Infact, I remember [1] people posting test results with such a workload
showing ProcArrayLock as contention.
[1] -
http://www.postgresql.org/message-id/e8870a2f6a4b1045b1c292b77eab207c77069...@szxema501-mbx.china.huawe
Currently, config/missing isn't being installed. This can lead to
confusing error messages, such as if Perl isn't found and something
needs it [1]. Attached patch adds it to install and uninstall recipes.
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Elephant that ended up on
a Cloud[1] is suddenly turning into a Hippo. :P
[1]
https://secure2.sfdcstatic.com/common/assets/images/home/sfdc-home-footer-logo.png
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(Ok, I guess we just sprayed the planet with debris instead of poking an
eye out...)
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t of work.
To me, the real tradeoff between Postgres and Oracle (or any other
commercial database) is whether you'd rather spend money on expert
employees or software contracts.
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On 10/22/15 6:39 PM, Alvaro Herrera wrote:
Jim Nasby wrote:
That would be the minimal-impact version, yes. But I suspect if we went
through the trouble to do that, it would be just as easy to attempt the
freeze regardless of what scan_all is set to.
You mean if !scan_all we conditional-get
it a lot easier for someone to customize how
testing works under PGXS.
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On 10/21/15 3:14 PM, Alvaro Herrera wrote:
Jim Nasby wrote:
While warning a client that just did a Slony-based version upgrade to make
sure to freeze the new database, it occurred to me that it should be safe to
freeze without the cleanup lock. This is interesting because it would allow
a
On 10/22/15 5:53 PM, Alvaro Herrera wrote:
Jim Nasby wrote:
But yes, this is all very hand-wavy without any actual data on what
percentage of the WAL stream is FPIs. Looks like pageinspect doesn't work
for WAL... does anyone have a script/tool that breaks out what percentage of
a WAL fi
To me this sounds like a recipe for disaster (i.e. complex bugs). WAL
(and thus CRC checksums) differing between nodes. Ugh.
The WAL would *not* differ. This would only affect streaming
replication, and only the stream itself.
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On 10/22/15 5:07 PM, Robert Haas wrote:
On Thu, Oct 22, 2015 at 5:51 PM, Jim Nasby wrote:
>It's also a permanent ID when the relation is first created.
No it isn't.
Is there no case where it can be a permanent XID for a table or toast table?
The other issue is relminmxid, wh
avy without any actual data on what
percentage of the WAL stream is FPIs. Looks like pageinspect doesn't
work for WAL... does anyone have a script/tool that breaks out what
percentage of a WAL file is FPIs?
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On 10/22/15 5:03 PM, Andres Freund wrote:
On 2015-10-22 16:34:38 -0500, Jim Nasby wrote:
ISTM it should be possible to avoid sending full page writes to a streaming
replica once the replica has reached a consistent state. I assume that the
replica would still need to write full pages to it&#
ivalent to RAISE, to avoid the make-work of writing that function.
That's why I disagree with your statement that there's no point to this
function even if it acts the same as RAISE.
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ver still need full page images in case of a crash? (Assuming
full_page_writes is enabled...)
The other issue is chained replicas, where one of the children may need
full page writes (during initial copy).
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can use RAISE statement.
It prevents everyone from reinventing the 'create a function wrapper
around RAISE' wheel that several people on this list alone have admitted
to. I think there's plenty of value in that.
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On 10/22/15 4:18 PM, Robert Haas wrote:
On Wed, Oct 21, 2015 at 1:33 PM, Jim Nasby wrote:
Currently, xid_age() returns INT_MAX for a permanent xid. The comment in the
function that 'Permanent XIDs are always infinitely old' may be technically
correct, but returning INT_MAX is
when to do so, instead of sending the full page image.
Presumably this would be a big win for replication over a WAN.
Am I missing something? I see that pglesslog is no longer supported but
couldn't find any particular reason for that...
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ame as RAISE does.
In other words, this function and raise should operate exactly the same
unless there's a really strong reason not to. Otherwise it's just going
to create confusion.
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eanup lock.
Does anyone have a feel for whether scan_all vacuums blocking on the
cleanup lock is an actual problem?
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ISTM VISIBILITY_MAP_FROZEN_BIT_CAT_VER shold be defined in catversion.h
instead of pg_upgrade.h though, to ensure it's correctly updated when
this gets committed though.
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danger. I think we should change it to return either 0, -1, or INT_MIN.
To me, 0 makes the most sense for monitoring relfrozenxid.
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On 10/19/15 7:12 PM, Tom Lane wrote:
Jim Nasby writes:
What did seem odd is that while processing the DECLARE section there
were plpgsql datums for tt.a and tt.b. I would have expected the
assignment to produce a row datum of type tt.
Yeah, that's the thing that's weird about plp
seems pretty excessive,
if that's the case...
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On 10/20/15 11:08 AM, CharSyam wrote:
I fixed some typos in posgres.
They are all in comments. :)
These all look good to me. RFC.
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Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http
ugh on 32-bit you probably can't get to 2GB anyway ...).
FWIW, I've verified on $CLIENT's system that this works as Tom
described. The truncation happened somewhere a bit north of 3GB, which
seems odd as this is a 64 bit system. But at least there were no OOM errors.
--
Jim Nasby,
ALUES (...), ..., (...)),
(SELECT ... ),
(INSERT ... RETURNING ... ),
my_srf()
)
AS t(...)
would actually work.
There's been a few places where I would have found that handy.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Archit
ase I think it's inline with what the C
code is already doing by testing for \0.
I suppose if we get the function it's not that bad since at least we get
the functionality, so I'll stop arguing it.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analyti
On 10/19/15 5:16 PM, Jim Nasby wrote:
Yeah, was hoping someone knew offhand why this was a problem. Guess I'll
rip the checks out and see what explodes.
... and what blows up is exec_eval_datum():
case PLPGSQL_DTYP
On 10/18/15 10:16 PM, Tom Lane wrote:
Jim Nasby writes:
Is there a particular reason why row and record variables can't be
CONSTANT in plpgsql?
Well, you can't usefully do anything with such a variable unless
it can be initialized, which isn't currently supported either:
all users.
You can set that up today by defining a view on top of
pg_stat_statements (or maybe it needs a SECDEF SRF... been a while since
I've done it).
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? G
Is there a particular reason why row and record variables can't be
CONSTANT in plpgsql?
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
--
Sent via pgsql-ha
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