pg_restore. It restores the given schemaname only. It can be used in
conjunction with the -t and other switches to make the selection very
fine grained.
Richard van den Bergg, CISSP
function that accepts a double precision argument assumed to be a Unix
epoch timestamp and returns timestamp with time zone, and accompanying
documentation.
Usage:
test=# select to_timestamp(200120400);
to_timestamp
------------------------
1976-05-05 14:00:00+09
(1 row)
Michael Glaesemann
psql. i.e. "\pset format troff-ms". The patch also corrects some
problems with the "latex" format, notably defining an extra column in
the output table, and correcting some alignment issues; it also
changes the output to match the border setting as documented in the
manual page and as shown with the "aligned" format.
The troff-ms output is mostly identical to the latex output allowing
for the differences between the two typesetters.
The output should be saved in a file and piped as follows:
cat file | tbl | troff -T ps -ms > file.ps
or
tbl file | troff -T ps -ms > file.ps
Because it contains tabs, you'll need to redirect psql output or use
"script", rather than pasting from a terminal window, due to the tabs
which can be replaced with spaces.
Roger Leigh
of a relation in a flat 'joininfo' list. The former arrangement grouped
the join clauses according to the set of unjoined relids used in each;
however, profiling on test cases involving lots of joins proves that
that data structure is a net loss. It takes more time to group the
join clauses together than is saved by avoiding duplicate tests later.
It doesn't help any that there are usually not more than one or two
clauses per group ...
< o Allow databases and schemas to be moved to different tablespaces
<
< One complexity is whether moving a schema should move all existing
< schema objects or just define the location for future object creation.
<
> o Allow databases to be moved to different tablespaces
484c480
< schema. Global system tables can never be moved.
> tablespace. Global system tables can never be moved.
as well as the existing pg_catalog entries for prefix and postfix %.
These have never been documented, though they did appear in one old
regression test. This avoids surprising behavior in cases like
"SELECT -25 % -10". Per recent discussion.
Note: although there is a catalog change here, I did not force initdb
since there's no harm in leaving the inaccessible entries in one's
copy of pg_operator.
transaction IDs, rather than like subtrans; in particular, the information
now survives a database restart. Per previous discussion, this is
essential for PITR log shipping and for 2PC.
< changes made by the interface driver for its internal use. One idea is
< for this to be a protocol-only feature. Another approach is to notify
< the protocol when a RESET CONNECTION command is used.
> changes made by the interface driver for its internal use. One idea
> is for this to be a protocol-only feature. Another approach is to
> notify the protocol when a RESET CONNECTION command is used.
last nextval() or setval() performed by the current session. Update the
docs, add regression tests, and bump the catalog version. Patch from
Dennis Björklund, various improvements by Neil Conway.
This allows the result of executing a SELECT to be assigned to a row
variable, record variable, or list of scalars. Docs and regression tests
updated. Per Pavel Stehule, improvements and cleanup by Neil Conway.
< all temporary tables, removal of any NOTIFYs, cursors, prepared
< queries(?), currval()s, etc. This could be used for connection pooling.
< We could also change RESET ALL to have this functionality.
> temporary tables, removing any NOTIFYs, cursors, open transactions,
> prepared queries, currval()s, etc. This could be used for connection
> pooling. We could also change RESET ALL to have this functionality.
> The difficult of this features is allowing RESET ALL to not affect
> changes made by the interface driver for its internal use. One idea is
> for this to be a protocol-only feature. Another approach is to notify
> the protocol when a RESET CONNECTION command is used.
---------------------------------------------------------------------------
While playing around, I got the following error message:
--
FATAL: pre-existing shared memory block (key 5432001, ID 90898435) is
still in use
HINT: If you're sure there are no old server processes still running,
remove the shared memory block with the command "ipcrm", or just delete
the file "/home/hlinnaka/pgsql/data/postmaster.pid".
---
Thats normal because I used "kill -9 postmaster" to shut down.
The hint advises me to use "ipcrm", but there's the "ipcclean" script in
bin for just this purpose. The hint should probably advise to use
ipcclean.
The attached patch replaces all occurances of "ipcrm" with "ipcclean" in
src/backend/utils/init/miscinit.c and all the translations in
src/backend/po.
While reviewing the patch, I noticed a likely typo in hr.po. While I
don't
speak Croatian, the translation seems to advise to use the "icpm(1)"
command. I changed that to "ipcclean" too.
Heikki Linnakangas
up have the standard layout with unused space between pd_lower and pd_upper.
When this is set, XLogInsert will omit the unused space without bothering
to scan it to see if it's zero. That saves time in XLogInsert, and also
allows reversion of my earlier patch to make PageRepairFragmentation et al
explicitly re-zero freed space. Per suggestion by Heikki Linnakangas.
other_rel_list with a single array indexed by rangetable index.
This reduces find_base_rel from O(N) to O(1) without any real penalty.
While find_base_rel isn't one of the major bottlenecks in any profile
I've seen so far, it was starting to creep up on the radar screen
for complex queries --- so might as well fix it.
a new PlannerInfo struct, which is passed around instead of the bare
Query in all the planning code. This commit is essentially just a
code-beautification exercise, but it does open the door to making
larger changes to the planner data structures without having to muck
with the widely-known Query struct.
< cleaned up properly. A new signal is needed for safe termination.
> cleaned up properly. A new signal is needed for safe termination
> because backends must first do a query cancel, then exit once they
> have run the query cancel cleanup routine.
1. Rename spi_return_next to return_next.
2. Add a new test for return_next.
3. Update the expected output.
4. Update the documentation.
Abhijit Menon-Sen
representation as the jointree) with two lists of RTEs, one showing
the RTEs accessible by qualified names, and the other showing the RTEs
accessible by unqualified names. I think this is conceptually simpler
than what we did before, and it's sure a whole lot easier to search.
This seems to eliminate the parse-time bottleneck for deeply nested
JOIN structures that was exhibited by phil@vodafone.
< logs
> logs [pitr]
130c130
< * Allow a warm standby system to also allow read-only queries
> * Allow a warm standby system to also allow read-only queries [pitr]
---------------------------------------------------------------------------
Tom Lane <tgl@sss.pgh.pa.us> writes:
> a_ogawa <a_ogawa@hi-ho.ne.jp> writes:
> > It is a reasonable idea. However, the majority part of MemSet was not
> > able to be avoided by this idea. Because the per-tuple contexts are used
> > at the early stage of executor.
>
> Drat. Well, what about changing that? We could introduce additional
> contexts or change the startup behavior so that the ones that are
> frequently reset don't have any data in them unless you are working
> with pass-by-ref values inside the inner loop.
That might be possible. However, I think that we should change only
aset.c about this article.
I thought further: We can check whether context was used from the last
reset even when blocks list is not empty. Please see attached patch.
>
> > The second issue is where plperl returns a large result set.
I have attached the following seven patches to address this problem:
1. Trivial. Replaces some errant spaces with tabs.
2. Trivial. Fixes the spelling of Jan's name, and gets rid of many
inane, useless, annoying, and often misleading comments. Here's
a sample: "plperl_init_all() - Initialize all".
(I have tried to add some useful comments here and there, and will
continue to do so now and again.)
3. Trivial. Splits up some long lines.
4. Converts SRFs in PL/Perl to use a Tuplestore and SFRM_Materialize
to return the result set, based on the PL/PgSQL model.
There are two major consequences: result sets will spill to disk when
they can no longer fit in work_mem; and "select foo_srf()" no longer
works. (I didn't lose sleep over the latter, since that form is not
valid in PL/PgSQL, and it's not documented in PL/Perl.)
5. Trivial, but important. Fixes use of "undef" instead of undef. This
would cause empty functions to fail in bizarre ways. I suspect that
there's still another (old) bug here. I'll investigate further.
6. Moves the majority of (4) out into a new plperl_return_next()
function, to make it possible to expose the functionality to
Perl; cleans up some of the code besides.
7. Add an spi_return_next function for use in Perl code.
If you want to apply the patches and try them out, 8-composite.diff is
what you should use. (Note: my patches depend upon Andrew's use-strict
and %_SHARED patches being applied.)
Here's something to try:
create or replace function foo() returns setof record as $$
$i = 0;
for ("World", "PostgreSQL", "PL/Perl") {
spi_return_next({f1=>++$i, f2=>'Hello', f3=>$_});
}
return;
$$ language plperl;
select * from foo() as (f1 integer, f2 text, f3 text);
(Many thanks to Andrews Dunstan and Supernews for their help.)
Abhijit Menon-Sen
> a_ogawa <a_ogawa@hi-ho.ne.jp> writes:
> > It is a reasonable idea. However, the majority part of MemSet was not
> > able to be avoided by this idea. Because the per-tuple contexts are used
> > at the early stage of executor.
>
> Drat. Well, what about changing that? We could introduce additional
> contexts or change the startup behavior so that the ones that are
> frequently reset don't have any data in them unless you are working
> with pass-by-ref values inside the inner loop.
That might be possible. However, I think that we should change only
aset.c about this article.
I thought further: We can check whether context was used from the last
reset even when blocks list is not empty. Please see attached patch.
The effect of the patch that I measured is as follows:
o Execution time that executed the SQL ten times.
(1)Linux(CPU: Pentium III, Compiler option: -O2)
- original: 24.960s
- patched : 23.114s
(2)Linux(CPU: Pentium 4, Compiler option: -O2)
- original: 8.730s
- patched : 7.962s
(3)Solaris(CPU: Ultra SPARC III, Compiler option: -O2)
- original: 37.0s
- patched : 33.7s
Atsushi Ogawa (a_ogawa)
RTE of interest, rather than the whole rangetable list. This makes
the API more understandable and avoids duplicate RTE lookups. This
patch reverts no-longer-needed portions of my patch of 2004-08-19.
Tom Lane