and even custom sort orders.
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with anything not
important, like for example gaps in sequences. You're essentially
crashing the DB.
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Patriotism is when love of your own people comes first; nationalism,
when hate for people other than your own comes
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was because we couldn't decide.
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, but if there is only one suitable
possibility I think this can be made to work.
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necessary.
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module which works as well and is one tenth of the size. It also
doesn't have external dependancies. It's just a plain wrapper around
libpq, which for the purposes of testing may be better.
http://search.cpan.org/~mergl/pgsql_perl5-1.9.0/Pg.pm
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something that was close to
libpq and had no external dependancies than taking a module with an
external dependancy (namely DBI).
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if it works.
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:
put transaction in aborted state
If no statement active:
do nothing
However, I see that the documentation wants to be able to abort a
*specific* statement, which is not being proposed here. Can that be
implemented on top of the current proposal?
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byte rather than the content.
In the implementation you may need to copy the content before
processing to satisfy the alignment of the contained type, but that's
just a SMOP.
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I recognise.
There are contiguous sets, but they are something else.
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the database enforce it.
(Intermediate values may become a different kind, just as long as the
result being stored it the right kind.)
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actual usecase for a distretized range type for
timestamp?
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/2009-01/msg02295.php
(It seems we've gone from a patch that had been around for years
solving actual people's problems to a patch which does barely anything
and we don't know whether it solves anybodies problem).
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).
As far as I can tell, just about all the interesting cases are for
row-level security. While MAC on tables and columns will be
interesting, my guess the real uptake will be when row-level control is
in.
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Please
on
disk with pages mapped into shared memory for read/write access.
While I can't really comment on the implementation, from your
description it looks like a big improvement.
Nice work!
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values (floor(random()*1000)::integer);
becomes something like:
WITH NEW AS (
insert into t values (floor(random()*1000)::integer);
RETURNING *
)
insert into t_log values (NEW.a);
Would this not have the required semantics?
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On Mon, Oct 05, 2009 at 10:32:53AM -0400, Tom Lane wrote:
Martijn van Oosterhout klep...@svana.org writes:
WITH NEW AS (
insert into t values (floor(random()*1000)::integer);
RETURNING *
)
insert into t_log values (NEW.a);
Would this not have the required semantics
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index: execute multiple queries of the form:
... AND display_price = 0.01 and display_price 1;
... AND display_price = 1 and display_price 10;
Because you match less records the sort won't be so expensive and you
can stop once you have enough records.
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results it could give you good results as to the reliability of the
recovery process.
Probably more a research project than anything else though.
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trickier.
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way.
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On Fri, Aug 21, 2009 at 09:42:57PM +1000, Paul Matthews wrote:
Martijn van Oosterhout wrote:
I haven't completely understood what you're trying to do
Putting in place the missing 'box op point' and 'point op box'
operators. The problematic queries are at the bottom of the email
day,
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[])
...
declare f a%element;
begin
...
I would have thought:
declare f a[0]%type;
as in: the type of a[0]. Perhaps a[]%type but that seems less natural.
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somewhere.
The same for the db_* convention. Do you have a reference to naming
conventions for SELinux permissions?
I need to think it over some more, but it's a really good start.
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.
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).
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, just supplement them.
Merely my opinion ofcourse, which doesn't count for much :)
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...
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the memory to the kernel,
irrespective of other allocations.
The threshold is dynamic apparently, but starts at 128KB.
Just a thought,
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that different users of the same library can control their own memory
usage without affecting others.
Not a short term solution, but it might help longer term. We certainly
have enough examples to convince them of the problem.
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processes I
might be running. On a NUMA machine you want to be keeping your memory
on the local node and letting the kernel copy that data from elsewhere
to your local memory when you need it.
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what you're trying to achieve. Why are you changing the source code?
Maybe someone else can answer your question specifically.
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and there is. I know of no
such standard support of either of the standard OSes.
For the record, in Debian Linux you can setup an encrypted root FS
during installation and it will ask to a password on every boot.
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do. Namely,
label stuff secret and be sure no-one without clearence can read it,
even if someone makes a setuid function for it.
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On Fri, Apr 17, 2009 at 07:07:31PM +0300, Marko Kreen wrote:
Btw, is there any good reason why we don't reject \000, \x00
in text strings?
Why forbid nulls in text strings?
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. Once Postgres decides it want to do unicode properly and thus
imports the tables in some way, it could get the code to work with it
for 20% extra.
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that everything has been put
in one node (left or right) and in that case just split the list
straight down the middle (since clearly it doesn't matter on which side
they appear.).
Or switch algorithms, but that's more than just a bugfix.
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the macro check that it
can take the address of the arguments, which amounts to almost the same
thing. It only doesn't work on constants.
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On Tue, Mar 24, 2009 at 10:18:08PM +, Greg Stark wrote:
On Tue, Mar 24, 2009 at 10:12 PM, Martijn van Oosterhout
klep...@svana.org wrote:
Not really a GCC extension, but you could have the macro check that it
can take the address of the arguments, which amounts to almost the same
thing
of a function could add
the appropriate magic to set the visiblity to public and alter PGXS to
set the default visibility to hidden. Voila, modules whose only
exported symbols are those declared with a version-1 declaration.
Perhaps a little too much magic :)
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. It shouldn't effect the ps output.
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products such as EDB's but the Windows
installer makes a pretty good argument on its own).
And all the linux distributions which ship precompiled binaries. I'm
sure there are people who compile postgres themselves but I think there
are more who don't.
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, this is precisely what
Veil does (and information_schema for that matter).
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obvious, I'm just not seeing it.
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on tables may be an
easier option.
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time, not dump time...
Another idea, have WITH OIDS just append a column to the table called
OID with SERIAL type. People see them, go whoops and drop them.
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can use their compression algorithm of the
week and we don't need to care about the licence or anything.
It's not like the case of TOAST where it actually needs to be builtin.
Tar doesn't have any compression builtin, yet you don't see many
uncompressed tar files...
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heap? It
saves more momery if 'arg' and 'argnull' declares as pointer type.
I imagaine it's because most of the time this structure would be
allocated on the stack, where allocation is essentially free. Having to
allocate two arrays from the heap would be slower.
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as UNRESERVED_KEYWORD there rather than RESERVED_KEYWORD.
Quite frankly, the grammer is not that hard part. If you can get it to
work with any grammer at all, some yacc guru can fix it to match any
grammer anyone wants in a very short time.
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.
Ofcourse, the simplest way to me for handling type changes seems to be
to keep the old type OID reserved and have the new version of the type
with a new OID. Then the entire problem vanishes. But it was decided a
long time ago not to do that.
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On Mon, Jan 26, 2009 at 08:28:32PM -0500, Tom Lane wrote:
Hmm, you think selinux people read pgsql-announce?
Maybe not, but it got it onto LWN, which is a lot more people.
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On Wed, Jan 14, 2009 at 09:52:20AM -0500, Tom Lane wrote:
Martijn van Oosterhout klep...@svana.org writes:
On Tue, Jan 13, 2009 at 10:05:45AM -0300, Alvaro Herrera wrote:
pgace.h: you have a bunch of static inline functions in here. As far
as I know this doesn't work in compilers other
,
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to
sloppiness in libraries, but it might help.
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in postgres. This generally works fine, except in the case of UNION
where none of the branches provide the necessary type info.
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find it quickly. This barely costs you anything in the compression
ratio mostly.
Implementation though, that's harder. The size of the blobs is tunable
also. I imagine the optimal value will probably be around 100KB. (12
blocks uncompressed).
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debug symbols in both the backend server and your
module, otherwise you're setting youself up for a lot of pain.
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animal and several test sets. Animals defines HW+OS version and test
set specify PG version, configure switches, compiler and so on.
Well, you could name them animal-1, animal-2, animal-3, etc... Once the
list reaches 100 entries we can think about alternatives...
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sleep?
In theory, none. SIGALRM is not set as SA_RESTART so any system call
should be interrupted. This applies to POSIX systems though, not sure
about Windows.
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the total SYSV
memory allowed by the OS. Otherwise you've just output an unstartable
config. The output of /sbin/sysctl should tell you.
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. Fortunatly, we don't need to do too much arithmetic on them.
If the size of the object doesn't matter, you can do thing like typedef
a pointer to a one byte struct. Then most standard arithmetic
operations will still work (IIRC the Linux kernel uses this trick a
lot).
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be
mitigated to only pages which are hint-bit *only* changed, not dirty with
already-wal-logged changes)
That's a long running debate. Hint bits do save I/O, the question is
the tradeoff.
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Please
all and continue. The checksums need
not be of equal strength.
The extreme case is an ECC where you explicitly can set it so you can
alter N bits before you need to recalculate the checksum.
Computationally though, that sucks.
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is that you want to continue in the face
of torn pages, something which is AFAICS ambitious. At least MS-SQL
just blows up on a torn page, havn't found results for other
databases...
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a COMP_CRC32_WITH_COPY() macro would do it. Just allocate a
block on the stack, copy/checksum it there, do the write() syscall and
forget it.
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the COMP_CRC32_ONE I
mentioned. Actually changing the memory probably means locking so why
bother.
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].hintbits # If n == numtups, next = BLOCK_SIZE
else:
CRC_ADD( block[pos]
pos++
This only handles one byte of hintbits but can easily be extended. No
need to actually *store* the hintbit free version anywhere...
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once the upgrade is complete.
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which could probably
get that down to a few KB.
Although, maybe locking of the hint bits would be a problem?
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this
issue?
Might be better anyway. A single copy-and-checksum would probably be
quite cheap (pulling the page into L2 cache).
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about covert
channels.
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room. So Phase one moves
a few tuples to make room. Phase 2 actually converts the pages inplace.
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solve the overflow problem on the old page...
Sure it does. You move just enough tuples that you can convert the page
without an overflow.
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feedback, hopefully. I imagine a number of people submit
patches because they hope to get some feedback on them, something which
does always happen at other times...
I think all this development is good.
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it's
supposed to end up. No need to preseed (or more accurately, it doesn't
matter how you preseed, the result is the same).
For checking it doesn't matter either, just checksum the page and if
you get zero it's correct.
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than adding
two reserved words.
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BY expressions anyway?
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clause. In the
tuplestore case you evaluate everything then throw it away.
Your test cases, if you append LIMIT 1 to all of them, how do the
timings compare then?
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think the code is in the right direction, but I think want you want
is some kind of estimate of given I've looked for tuple X, how many
tuples in the next k pages are near this one. Unfortunatly I don't see
a way of calculating it other than a full simulation.
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there is no certificate at all, so why
would you if the certificate is untrusted?
You seem to be making the assertion that making an encrypted connection
to an untrusted server is worse than making a plaintext connection to
an untrusted server, which seems bogus to me.
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On Tue, Oct 21, 2008 at 11:55:32AM +0100, Gregory Stark wrote:
Martijn van Oosterhout [EMAIL PROTECTED] writes:
You seem to be making the assertion that making an encrypted connection
to an untrusted server is worse than making a plaintext connection to
an untrusted server, which seems
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as they are cast to text, since the text type
will have a default collation (just like it has a default operator
class).
Nice to see some progress being made here.
Have a nice day,
--
Martijn van Oosterhout [EMAIL PROTECTED] http://svana.org/kleptog/
Please line up in a tree and maintain the heap
think the storage space considerations make that a difficult option.
Have a nice day,
--
Martijn van Oosterhout [EMAIL PROTECTED] http://svana.org/kleptog/
Please line up in a tree and maintain the heap invariant while
boarding. Thank you for flying nlogn airlines.
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van Oosterhout [EMAIL PROTECTED] http://svana.org/kleptog/
Please line up in a tree and maintain the heap invariant while
boarding. Thank you for flying nlogn airlines.
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such functions
easily in practice doesn't change the fact that zip codes and city
names are highly correlated.
Have a nice day,
--
Martijn van Oosterhout [EMAIL PROTECTED] http://svana.org/kleptog/
Please line up in a tree and maintain the heap invariant while
boarding. Thank you for flying nlogn
potential use case is the (startdate,enddate) columns. Here what
you want to detect somehow that the distribution of (enddate-startdate)
is constant.
I think the real question is: what other kinds of correlation might
people be interested in representing?
Have a nice day,
--
Martijn van
with a partial index. This should be fairly easy to do I think.
It might be worthwhile someone trawling through the archives looking
for examples where we estimate the correlation wrong.
Have a nice day,
--
Martijn van Oosterhout [EMAIL PROTECTED] http://svana.org/kleptog/
Please line up in a tree
,
--
Martijn van Oosterhout [EMAIL PROTECTED] http://svana.org/kleptog/
Please line up in a tree and maintain the heap invariant while
boarding. Thank you for flying nlogn airlines.
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/locales. You may be able to
guess a few but certainly not all of them.
Have a nice day,
--
Martijn van Oosterhout [EMAIL PROTECTED] http://svana.org/kleptog/
Please line up in a tree and maintain the heap invariant while
boarding. Thank you for flying nlogn airlines.
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