will create them for people that actually need them.
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reference
them. I think it's well worth renaming them.
I actually like the idea of re-organizing everything too. It would be
easy to include a tool that puts symlinks in place to all the original
locations if you need that.
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n why you're interested in page lsns, that'd perhaps allow
us to give more meaningful feedback.
Yeah, especially since you mentioned this being for backups. I suspect
you *want* those WAL records marked with 0, because that tells you that
you can't rely on WAL when you back that da
ones lived
inside a schema (as opposed to globally), and which ones were
shared/global (cross-database). I think I needed this for some automatic
handling of comments, but it's been a while. Maybe something like that
would help reduce the duplication...
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Jim Nasby, Data Architect, Blue Tre
On 8/22/16 7:36 PM, Peter Geoghegan wrote:
For some reason, both cases involved
strings with code points from the Arabic alphabet, even though each
case was from a totally unrelated customer database.
Do those code points read right to left? Maybe that had an effect?
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On 8/17/16 8:12 AM, Andrew Gierth wrote:
I also recently found a case where using btree exclusion constraints was
useful: a unique index on an expression can't be marked deferrable, but
the equivalent exclusion constraint can be.
That seems well worth documenting...
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enough to negate the cost of
resetting on every call though...
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On 8/18/16 6:02 PM, Corey Huinker wrote:
I'd be happy to roll your code into the extension, and make it marked
more stable.
Yeah, I've been meaning to look at submitting a pull request; hopefully
will get to it today.
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e the code between the
two as well...
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context without much gain.)
Some folks do create very large plpgsql functions, so if there's a handy
way to estimate the size of the function (pg_proc.prosrc's varlena size
perhaps) then it might be worth doing that for quite large functions.
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(which I suppose could be
*) with the specifiers would solve that issue.
Also, if we believe that this has a safe use-case, why only -T, and
not pg_dump's other object selectivity options?
+1.
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came up was
your range_partitioning stuff, which AFAICT is unrelated.
http://pgxn.org/dist/range_type_functions/ still doesn't show up in
search, maybe because it's marked unstable?
Rather frustrating that I've spent time creating an extension that
duplicates your work. :(
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nuke that page
and point at something in the docs? Something else?
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Se
someone that has the backend PID in his prompt... +1. Or
alternatively, a command that is just run when the connection changes
instead of every command...
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ngs up the
way they are today.
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ched
and never going to change?
I'm wondering if we've hit the point where trying to put all of this in
a single GUC is a bad idea... changing that probably means a config
compatibility break, but I don't think that's necessarily a bad thing at
this point...
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On 8/17/16 9:46 PM, Stephen Frost wrote:
* Jim Nasby (jim.na...@bluetreble.com) wrote:
> https://wiki.postgresql.org/wiki/Binary_Replication_Tutorial does
> not specify -c for any of the rsync commands. That's maybe safe for
> WAL, but I don't think it's safe for any
On 8/17/16 2:51 PM, Simon Riggs wrote:
On 17 August 2016 at 12:19, Greg Stark wrote:
On Wed, Aug 17, 2016 at 1:36 AM, Jim Nasby wrote:
Something I didn't see mentioned that I think is a critical point: last I
looked, HOT standby (and presumably SR) replays full page writes. That means
is to
just stick -c in all the commands.
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On 8/16/16 6:56 PM, David G. Johnston wrote:
On Tue, Aug 16, 2016 at 7:47 PM, Jim Nasby mailto:jim.na...@bluetreble.com>>wrote:
On 8/15/16 10:12 PM, Tom Lane wrote:
Jim Nasby writes:
Any reason why we can create a function that accepts
anyeleme
ly be REALLY happy you have it. Similarly, I always encourage
people to run a weekly or monthly pg_dump if it's at all feasible...
just to be safe.
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his stuff. Is the idea of
"partitioning" the catalogs to store temp objects separate from
permanent fatally flawed?
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On 8/15/16 10:12 PM, Tom Lane wrote:
Jim Nasby writes:
Any reason why we can create a function that accepts anyelement and
returns anyarray, but can't do the same with anyrange?
Because there can be more than one range type over the same element
type, so we couldn't deduce which
thetical, because no one could realistically propose a patch to use
C++ (or maybe even Rust) features.
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equirement to build Postgres.
Maybe we'll eventually go that route, after demonstrating the
significant benefits that would need to exist to make that work
worthwhile. It's going to be FAR easier to demonstrate that if the
native project at least supports using it, vs needing a comp
wanted to add support for C++.
Joy, do you have an idea what a *minimally invasive* patch for C++
support would look like? That's certainly the first step here.
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d3EvRdo-Rd6eo8QPEqV8=shau2sjfo16wfe0r-h...@mail.gmail.com
2: https://petereisentraut.blogspot.com/2013/05/moving-to-c.html
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AGE plpgsql AS $body$
BEGIN
RETURN array[$1,$2];
END$body$;
CREATE FUNCTION
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a SAN).
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ABORT. In particular, release
snapshots. Since there's no substransaction, there's no possibility of
running further commands. Is there risk to that with portals still open?
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contains spaces without
being quoted. AFAIK nothing else in the system allows that, and I don't
see why character varying and timestamp with* should get a special pass.
I doubt we could get rid of this in CREATE TABLE, but I wonder how many
people actually cast using the unquoted form.
--
; token, and have enough control to look for a relevant
function?
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values to.
I'm wondering if also creating the same options for all-frozen pages
would be worthwhile. I don't see an obvious use for that, but maybe
someone else does (and adding both at once would presumably be the least
amount of work...)
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a way this could be hinted?
FWIW, the real-world case here comes from using pgTap, which has an is()
function. I've used that countless times by itself without quoting, so
it never occurred to me that the syntax error was due to lack of quotes.
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On 8/10/16 12:48 PM, Claudio Freire wrote:
On Tue, Aug 9, 2016 at 11:39 PM, Jim Nasby wrote:
On 8/9/16 6:44 PM, Claudio Freire wrote:
Since we can lookup all occurrences of k1=a index=0 and k2=a index=0,
and in fact we probably did so already as part of the update logic
That's a c
ed to be in shared memory, because we also
want to protect against two *different* backends pinning it.
Right, this would strictly protect from it happening within a single
backend. Perhaps it's pointless for pin/unpin, but it seems like it
would be a good thing to have for attach/detac
uld reduce
the cost of vacuum enormously. Orders of magnitude wouldn't surprise me
in the least.
If that's indeed a prerequisite to WARM it would be great to get that
groundwork laid early so others could work on other optimizations it
would enable.
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2 3 4
k1 .. a a a
k2 .. b a a
i1 ^
i2 ^
lp u u r3
hot*
FWIW, your ascii-art is unfortunately getting bungled somewhere I think :/.
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?
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veral of which I forgot even existed until just now. Since there's
question over the actual overhead maybe that's a prudent approach for
now, but I think we should be striving to enable these things ASAP.
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Experts in An
ed value.
What if some of this work happened asynchronously? I'm thinking
something that runs through shared_buffers in front of bgwriter.
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he same
segment.
Could a couple of static variables be used to ensure multiple pin/unpin
and attach/detach calls throw an assert() (or become a no-op if asserts
are disabled)? It would be nice if we could protect users from this.
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Also, there's some other common gotchas that we could better warn users
about, some of which involve DDL. One example is accidentally defining
duplicate indexes.
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Data in T
that's a problem we already have in some
places, so perhaps not worth worrying about.
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ad of doing that I elected to parse
pg_get_triggerdef[1], but that's hardly satisfying either.
1: https://github.com/decibel/cat_tools/blob/master/sql/cat_tools.sql#L339
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Dat
On 8/4/16 4:53 PM, Marko Tiikkaja wrote:
On 2016-08-04 11:23 PM, Jim Nasby wrote:
I've got a customer that discovered something odd...
SELECT f1 FROM v1 WHERE f2 not in (SELECT bad FROM v2 WHERE f3 = 1);
does not error, even though bad doesn't exist, but
I'm guessing there&#x
example. There's more reasons than just CPU that parallel workers can
help (IO being an obvious one, but possible other things like GPU).
Another example is allowing users to alter the selection process used by
autovac workers.
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Ex
his is on 9.4.8, and both v1 and v2 are views. The only "odd" thing
that I see is that v1 is a UNION ALL and v2 is a UNION. I don't think
there's any tables in common between the two views.
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Experts in Analytics,
) that offers the old behavior. Users could even put that function
before pg_catalog in search_path and get the old behavior back.
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the problem. (Their
docs actually used to say that anything other that table-level locking
was a bad idea.)
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855-TREB
idea worth pursuing, but I don't see how you can make it
work with our MVCC system unless we drop the aversion to scanning back
into an index as part of an update.
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Dat
the
assumption that referencing NEW in a DELETE trigger would be legit and
give you NULL with the new semantics, but trying to actually reference
any of it's fields would produce an error).
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/communication features and a
sketch of a design.
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least of your worries. If we don't
want to get too wrapped up in config/syntax I think there should at
least be a read-only statement level trigger installed by default that
users can then drop or disable if desired.
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Exper
On 7/22/16 1:58 PM, Andres Freund wrote:
On 2016-07-22 13:51:31 -0500, Jim Nasby wrote:
Another option would be to remember the
tuple offsets (NOT attcacheoff) that have
been computed as well as whether a
varlena attribute has actually been
deformed. That eliminates the need to
pre-declare what
e additional
support that would be needed in expanded objects themselves.
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L::c).t
IS NULL might be allowed (special case retrieving field values from a
composite that's not actually defined).
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ot supported, but it would be
nice if I could just do CREATE TYPE c AS (t text NOT NULL, i int);
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On 7/21/16 11:46 AM, David Fetter wrote:
> Can't you implement this as a extension?
Yes. In that case, I'd want to make it a contrib extension, as it is
at least in theory attached to specific major versions of the backend.
Howso?
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a function in that extension:
EXTENSION MODE citus;
master_create_distributed_table 'github_events', 'created_at', 'append';
EXTENSION MODE;
instead of SELECT master_create_distributed_table('github_events',
'created_at', 'append');
ob
Depending on how it was
structured, it might also insulate the database from having to panic if
a function crashed it's process.
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ta, and because of it's binary nature
the odds of some kind of a corruption event happening are far higher
than with something like londiste. Certainly many environments don't
have those concerns though. Having options are good.
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because arrays are a
PITA? Is it too hard to call functions?
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?
In a lot of situations ("top" for instance) only a limited number of
characters can be displayed from a process title. I'm hesitant to add
fields to that string that we don't really need.
Could we make this configurable, similar to log_line_prefix?
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t may have some. Is that an oversight?
Seen as how you used to be able to illegally twerk NOT NULL status on
children (and maybe still can), I'd bet this is a bug...
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Data
testing. Though I do think something
that's sorely needed is the ability to test stuff at the C level.
Sometimes SQL is jut too high a level to verify things.
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Data in Troubl
On 7/1/16 3:43 PM, Andres Freund wrote:
On 2016-07-01 15:42:22 -0500, Jim Nasby wrote:
On 7/1/16 2:23 PM, Andres Freund wrote:
The only
cost of that is that vacuum will come along and mark the page
all-visible again instead of skipping it, but that's probably not an
enormous expense in
s all-visible for
index-only purposes. If it's an insert mostly table, it can be a long
while till vacuum comes around.
ISTM that's something that should be addressed anyway (and separately), no?
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n't have a choice about
that unless we expressly forbid arrays where any of the elements of
*dims were 0 (which I suspect we should probably do anyway... I don't
see how you can do anything with a 2x0x3 array...)
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Experts
for everything that's varlena (AFAICT plperl already suffers from this).
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ctions. Not the nicest
way to handle this problem, but it is workable and having a regex
example available for people to start with would be very helpful.
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Data in T
views, but
rather functions that serve specific purposes. For table bloat that
means a function that returns what the heap size should be based on
pg_stats. For locking, it means providing information about which PID is
blocking which PID. After that, most everything else is just window
dressing.
--
to pg_config? It's common to need to know what version you're handling
in a Makefile, and today that's pretty ugly (especially when something
is stamped as beta, since it breaks assumptions about numeric).
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On 6/14/16 3:56 PM, Tom Lane wrote:
Jim Nasby writes:
On 6/14/16 3:01 PM, Robert Haas wrote:
This seems kind of silly, because anybody who is writing code that
might have to run against an existing version of the database won't be
able to use it. The one thing that absolutely has to be
On 6/14/16 3:38 PM, Joshua D. Drake wrote:
On 06/14/2016 12:46 PM, Jim Nasby wrote:
Any ideas on naming for such a function? version_detail()? I suppose
while we're at this we might as well provide the compile details as well.
version(detail) or version(verbose)
I don't think tha
hat doesn't currently exist anyway. So
no matter what, you won't be able to use it if you're interested in
<10.0 (or <9.6 if we went with one of the other proposals).
Unless folks were thinking this is something that would be backpatched?
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On 6/8/16 4:36 PM, Bruce Momjian wrote:
Just a follow-up, but even with a randomized correlation order, it seems
25% restrictivity generates a Bitmap Index Scan:
AFAIK we do the bitmap heap scan in heap order, thereby eliminating the
effect of correlation?
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that presumably the explain penalty would be a moot
point.
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ver an encrypted FS, other than a feature
comparison checkmark...)
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S
ill has to support 3 numbers
would also be a wart. We've lived with the parsing wart this long, so
lets just add an explicit output version to 10.0.
Any ideas on naming for such a function? version_detail()? I suppose
while we're at this we might as well provide the compile details as
n some of these scenarios, because it's
so difficult to put the system into that state to begin with. Stuff that
depends on burning through a large number of XIDs is an example of that.
(To be clear, I'm talking about unit-test kind of stuff here, not
validating an existing system.)
scover; I doubt most
users are aware that you *can* analyze individual columns.
Is there any significant advantage to not analyzing all columns? Only
case I can think of is if you have a fair number of columns that have
been toasted; otherwise I'd think IO would completely swamp any other
I'm pretty sure this is a typo...
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diff --git a/src/backend/access
as a table column
So that's 5 x 2 (once for domain[], once for create type blah(x
domain[])) test cases. There might be some other cases that are missing
(what cast testing needs to happen?)
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On 5/30/16 1:01 PM, Andrew Gierth wrote:
Returning an array containing the values of all capture groups might be
more useful (substring returns the value of the first capture group if
any, otherwise the matched string).
+1.
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not enough when different GRSes are involved?
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o
away, *especially* if the [] notation allowed things like a slice and a
list of values (ie: json['foo', 'bar', 'baz'] = '[42,{"my": "nice
object"},"with a random string"]'. Or = row(42, ...).
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e
confusing, and I don't see any options for parallelism that are any clearer.
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ted if different projection methods
are involved. I don't know if PostGIS depends on what these macros are
doing or not. If it doesn't, perhaps it would be sufficient to lop of
the last few bits of the significand. ISTM that'd be much better than
what the macros currently do.
BTW, I su
W, take a look at MADlib svec[1]... ISTM that's just a special case of
what you're describing with entire grids being zero (or vice-versa).
There might be some commonality there.
[1] https://madlib.incubator.apache.org/docs/v1.8/group__grp__svec.html
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ain for *any*
operations are most welcome! I think allowing queued backgrounded
processes would be a huge win there. If we had real stored procedures
(IE: ability to control transaction state) and a modest background
scheduler then it wouldn't be hard to build that.
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#x27;ve moved from being
an RDBMS to being a "Data Platform". Improving our OO capabilities just
continues that.
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LL bitmap
implementation).
Related to this, Tom has mentioned in the past that perhaps we should
support abstract use of the [] construct. Currently point finds a way to
make use of [], but I think that's actually coded into the grammar.
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; that simply evaluate a boolean expression (and don't
require defining a function).
--
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
855-TREBLE2 (855-873-2532) mobile:
dy know exactly how
to fail over.
--
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
855-TREBLE2 (855-873-2532) mobile: 512-569-9461
--
Sent via pgsql-hackers mailing list
On 5/23/16 4:45 PM, David G. Johnston wrote:
On Mon, May 23, 2016 at 5:38 PM, Jim Nasby mailto:jim.na...@bluetreble.com>>wrote:
On 5/23/16 11:55 AM, Peter van Hardenberg wrote:
Fortunately, this seems quite easy to resolve by taking
advantage of our
ability
urprise me that people would want to parallel dump
from a replica...
--
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
855-TREBLE2 (855-873-2532) mobile: 512-569-9461
-
On 5/23/16 4:19 AM, Craig Ringer wrote:
+Batching less useful when information from one operation is required by the
SB "Batching is less useful".
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Troub
, we need to be doing *more* of this kind of work, not
less. Lack of support for OO paradigms was one of the drivers for NoSQL.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTrebl
itioning.
I also disagree about PK:PK FK's between a bunch of completely
independent tables being a good way to model this stuff. It doubles the
complexity of every query against a child table and doesn't perform
nearly as well, because your data locality goes down the tubes.
--
J
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