Re: [HACKERS] Indexed views?
Mischa Sandberg [EMAIL PROTECTED] writes: I take it that it is a very reasonable assumption that only a small proportion of index records are actually invalid (else Yurk why use the index?). That's faulty logic, the percentage of tuples that are valid is entirely independent from the percentage of tuples that match your range criterion. Ie, I could be selecting 100 tuples out of a million -- even if 99 are invalid it's still worthwhile to use the index. Since you're using an index at all, the planner must be expecting a restricted set of rows to make it up through to the root. If there is any filter criteria against the values from the index rows, you won't even have to check rows for tuple visibility, that don't pass that filter. It's an interesting idea though. But I can't think of many queries where it would be interesting. The query would still have to visit every page containing a record used in the final result. So the only time this would be a significant win is if you're applying very selective restrictions to columns that were in the index but weren't able to put in the index condition. This seems like a pretty rare situation; usually the reason you put columns in an index definition is because it is going to be useful for index conditions-- especially if it's a particularly selective column. -- greg ---(end of broadcast)--- TIP 4: Don't 'kill -9' the postmaster
Re: [HACKERS] Help with check_pqsql PLUGIN!
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, On Thu, 9 Sep 2004, [koi8-r] ??? ?. wrote: Hello, Hackers! I use Nagios - monitoring system. Can you help, please? I want to compile plugin for Nagios named 'check_pqsql'. Which libraries I need to compile it successful? Thank you. If you're using rpm-based distros, installing postgresql-libs package will help you. While compiling both of'em from source, you need to specify PostgreSQL libdir to configure script of Nagios: - --with-pgsql-lib=$PGDATA/lib where $PGDATA is the directory that PostgreSQL is installed. i.e.: ./configure --with-pgsql-lib=/usr/local/pgsql/lib --with-pgsql-status - --with-pgsql-xdata --with-pgsql-comments --with-pgsql-extinfo - --with-pgsql-retention --with-pgsql-downtime (with additional options for nagios...) Also, you could check Nagios mailing lists for further help. Regards, - -- Devrim GUNDUZ devrim~gunduz.orgdevrim.gunduz~linux.org.tr http://www.tdmsoft.com http://www.gunduz.org -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFBQqiftl86P3SPfQ4RAnB9AJ9ZgFy8aLoqG4hYbdM/oWsAy9Az5QCgyJyt EJj3jWi7f7MdXa9T5Zor0sA= =VscW -END PGP SIGNATURE- ---(end of broadcast)--- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [pgsql-hackers-win32] [HACKERS] more dirmod CYGWIN
-Original Message- From: [EMAIL PROTECTED] on behalf of Tom Lane Sent: Fri 9/10/2004 10:20 PM To: Bruce Momjian Cc: Reini Urban; PostgreSQL-development; PostgreSQL Win32 port list Subject: Re: [pgsql-hackers-win32] [HACKERS] more dirmod CYGWIN We don't --- apparently the win32 crowd hadn't bothered to try it until recently. There are a couple of patches in the queue that claim to make individual modules work, but I dunno what the overall situation is. I posted a list of a 8-10 a few days ago that didn't compile. Most do, and as Tom says, a few patches have been posted. There are some such as pg_logger that I believe are now obsolete on all platforms incidently. Regards, Dave ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
Re: [HACKERS] Error starting PostgreSQL on Win XP: failed to get token information: 122
Hi Thanks for PostgreSQL Beta 8.0! I try to use the native Win32 build (http://pgfoundry.org/projects/pginstaller) (Beta 1) but i get an error during DB startup. failed to get token information: 122 Maybe this is related to http://groups.google.com/groups?hl=enlr=ie=UTF-8selm=cftihc% 247uk%241%40sea.gmane.org My computer is part of 8 security groups My user is part of 35 security groups (used gpresult.exe to figure out) This is a known issue that has been fixed in beta-2. //Magnus ---(end of broadcast)--- TIP 8: explain analyze is your friend
Re: [HACKERS] beta2 and blob's
Daniel Schuchardt [EMAIL PROTECTED] writes: Hi with beta2 i get leak:relation pg_largeobject_loid_pn_index has refcnt 1 instead of 0 Fixed, thanks. regards, tom lane ---(end of broadcast)--- TIP 4: Don't 'kill -9' the postmaster
Re: [HACKERS] beta 2 crash with unique constraints
Daniel Schuchardt [EMAIL PROTECTED] writes: duplicate key violates unique constraint ferber_rust_params_pkey FATAL: block 0 of 1663/19335/476756 is still referenced (local 2) server closed the connection unexpectedly This is already fixed, but thanks for the report! regards, tom lane ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [HACKERS] Adding columns in the middle (Was: Developers page is down)
Michael Glaesemann wrote: On Sep 4, 2004, at 10:07 PM, Christopher Browne wrote: Centuries ago, Nostradamus foresaw when [EMAIL PROTECTED] (Jaime Casanova) would write: By the way, will be a way in postgresql 8 to add a column in a middle of a table. just curious. What do you mean by in a middle of a table? A relation is simply a set of attributes that _don't_ forcibly have an order, because sets are unordered. In the SQL spec, columns are ordered, iirc, as sad as that is. Writing application code that depends on column order is asking for pain and suffering. All we agree on this, the only reason this feature is needed is to continue to have a well table structure, see my last post. Regards Gaetano Mendola ---(end of broadcast)--- TIP 8: explain analyze is your friend
Re: [HACKERS] x86_64 configure problem
Joe Conway wrote: Gaetano Mendola wrote: Joe Conway wrote: # python -c from distutils.sysconfig import get_python_lib as f; import os; print os.path.join(f(plat_specific=1,standard_lib=1),'config') /usr/lib64/python2.3/config Any other proposals? If not, any objections to the attached patch? No one, we have to check also for the presence of distutils package installation. It's not installed by default and I was bitten by it during the RPM building for RH AS 2.1 What version of python comes with RH2.1? 1.5.2 In any case, the online documentation for python suggests that it is reasonable to expect that distutils is already installed (by default for python = 1.6, and by the user for python 1.5.2). See: http://www.python.org/doc/2.2.3/dist/intro.html If there are no other objections, I'll commit the attached in about 24 hours. Are you going also to change the configure so it will check the distutils package installation ? Regards Gaetano Mendola ---(end of broadcast)--- TIP 8: explain analyze is your friend
Re: [HACKERS] x86_64 configure problem
Gaetano Mendola wrote: Joe Conway wrote: What version of python comes with RH2.1? 1.5.2 In any case, the online documentation for python suggests that it is reasonable to expect that distutils is already installed (by default for python = 1.6, and by the user for python 1.5.2). See: http://www.python.org/doc/2.2.3/dist/intro.html If there are no other objections, I'll commit the attached in about 24 hours. Are you going also to change the configure so it will check the distutils package installation ? I wasn't going to -- python's own docs say I shouldn't need to. From the link above: the Distutils work just fine with Python 1.5.2, and it is reasonable (and expected to become commonplace) to expect users of Python 1.5.2 to download and install the Distutils separately before they can install your modules Joe ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
Re: [HACKERS] x86_64 configure problem
Gaetano Mendola wrote: Joe Conway wrote: I wasn't going to -- python's own docs say I shouldn't need to. From the link above: the Distutils work just fine with Python 1.5.2, and it is reasonable (and expected to become commonplace) to expect users of Python 1.5.2 to download and install the Distutils separately before they can install your modules I'm not native english speakers but that sentence above doesn't imply Python 1.5.2 = Distutils. So instead of an error like this: checking Python installation directories... Traceback (innermost last): File string, line 1, in ? ImportError: No module named distutils Traceback (innermost last): File string, line 1, in ? ImportError: No module named distutils /usr/ checking how to link an embedded Python application... no configure: error: Python Makefile not found error: Bad exit status from /var/tmp/rpm-tmp.56347 (%build) is better have: Error: you need to have Distutil installed Perhaps. The first error message seems clear enough to me, but if you want to send me the necessary distutils test, I can incorporate it. Any other opinions out there? Joe ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
Re: [HACKERS] x86_64 configure problem
Joe Conway wrote: Gaetano Mendola wrote: Joe Conway wrote: What version of python comes with RH2.1? 1.5.2 In any case, the online documentation for python suggests that it is reasonable to expect that distutils is already installed (by default for python = 1.6, and by the user for python 1.5.2). See: http://www.python.org/doc/2.2.3/dist/intro.html If there are no other objections, I'll commit the attached in about 24 hours. Are you going also to change the configure so it will check the distutils package installation ? I wasn't going to -- python's own docs say I shouldn't need to. From the link above: the Distutils work just fine with Python 1.5.2, and it is reasonable (and expected to become commonplace) to expect users of Python 1.5.2 to download and install the Distutils separately before they can install your modules I'm not native english speakers but that sentence above doesn't imply Python 1.5.2 = Distutils. So instead of an error like this: checking Python installation directories... Traceback (innermost last): File string, line 1, in ? ImportError: No module named distutils Traceback (innermost last): File string, line 1, in ? ImportError: No module named distutils /usr/ checking how to link an embedded Python application... no configure: error: Python Makefile not found error: Bad exit status from /var/tmp/rpm-tmp.56347 (%build) is better have: Error: you need to have Distutil installed Regards Gaetano Mendola ---(end of broadcast)--- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [HACKERS] x86_64 configure problem
On Sat, 2004-09-11 at 14:05, Joe Conway wrote:
Perhaps. The first error message seems clear enough to me, but if you
want to send me the necessary distutils test, I can incorporate it. Any
other opinions out there?
AC_MSG_CHECKING([for Python distutils module])
if ${PYTHON} 2- -c 'import distutils'
then
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
AC_MSG_ERROR([distutils module not found])
fi
That should work.
While I'm of the opinion that installations without distutils are
antiquated, I see no reason why we couldn't check for it anyways.
(Gaetano requested it so there would probably be others who would
appreciate it.)
--
Regards,
James William Pye
signature.asc
Description: This is a digitally signed message part
Re: [HACKERS] x86_64 configure problem
Joe Conway wrote: Gaetano Mendola wrote: Joe Conway wrote: I wasn't going to -- python's own docs say I shouldn't need to. From the link above: the Distutils work just fine with Python 1.5.2, and it is reasonable (and expected to become commonplace) to expect users of Python 1.5.2 to download and install the Distutils separately before they can install your modules I'm not native english speakers but that sentence above doesn't imply Python 1.5.2 = Distutils. So instead of an error like this: checking Python installation directories... Traceback (innermost last): File string, line 1, in ? ImportError: No module named distutils Traceback (innermost last): File string, line 1, in ? ImportError: No module named distutils /usr/ checking how to link an embedded Python application... no configure: error: Python Makefile not found error: Bad exit status from /var/tmp/rpm-tmp.56347 (%build) is better have: Error: you need to have Distutil installed Perhaps. The first error message seems clear enough to me, but if you want to send me the necessary distutils test, I can incorporate it. Any other opinions out there? python -c from distutils import * /dev/null 21 || (echo You need distutils installed; exit 1) Regards Gaetano Mendola ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
[HACKERS] beta1 beta2 Windows heavy load
Hi list, is it is known that postgres 8.0 (beta1 and beta2 both same behavoir) will eat tons of memory on Windows under heavy load? Scenario: I have a big delete with about 56000 rows. (DELETE FROM mytable;) There are triggers (after delete) updating 2 or 3 other tables. (there are triggers on this tables too). first everything seems ok but after a short tine postgres starts eating memory. On my mashine one postgres.exe sometimes eates 300MB or more. prob one : everything becomes slow because windows is swapping... main problem : if there is to less virutal memory postgres will abort because of to less memory. For a 56000 row delete you need 500MB of virtual ram or postgres aborts. I noticed the same behavoir when do lets say 75000 rows in a table (triggers updating other tables also). In both situations without transactions. Is this is a bug? Daniel. ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://archives.postgresql.org
