[HACKERS] XML support?
Hi I saw in TODO CLIENTS * Add XML interface: psql, pg_dump, COPY, separate server and there's some code for JDBC in contrib/retep directory. Are there any plans to add xml support to postgresql, to return rown in formatted in xml for start? not only from psql, but from everywhere (e.g. php) Thanks! -- Marius Andreiana -- You don't have to go to jail for helping your neighbour http://www.gnu.org/philosophy/ ---(end of broadcast)--- TIP 2: you can get off all lists at once with the unregister command (send unregister YourEmailAddressHere to [EMAIL PROTECTED])
Re: [HACKERS] syslog by default?
On Sep 12, [EMAIL PROTECTED] contorted a few electrons to say... Bruce OK, that makes sense. My only question is how many platforms _don't_ Bruce have syslog. If it is only NT and QNX, I think we can live with using Bruce it by default if it exists. perhaps you could take some code from http://freshmeat.net/projects/cpslapi/ which implements a syslog-api that writes to NT's eventlog. i'd be glad to change the license if it is useful. jr -- Joel W. Reed412-257-3881 --All the simple programs have been written. PGP signature ---(end of broadcast)--- TIP 2: you can get off all lists at once with the unregister command (send unregister YourEmailAddressHere to [EMAIL PROTECTED])
[HACKERS] Trigger - Editing Procedures
I have written some triggers which will call some procedures. I am looking for some way wherein I canedit these procedures Is there any way to do so? regards, joseph
Re: [HACKERS] Index location patch for review
Attached is a patch that adds support for specifying a location for indexes via the create database command. I believe this patch is complete, but it is my first . This patch allows index locations to be specified as different from data locations. Is this a feature direction we want to go in? Comments? Having the table and index on separate drives can do wonders for i/o performance. :) darrenk ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
[HACKERS] System Tables
Are the table structures of the System Tables changed often? Have they changed from v7.1.1 and v7.1.2? Peter -- +--- | Data Architect | your data; how you want it | http://www.codebydesign.com +--- ---(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] querying system catalogs to extract foreign keys
On 13 Sep 2001 22:56:16 -0700, you wrote: I tried to use the getImportedKeys and getExportedKeys of java.sql.DatabaseMetadata... But it didnt give any expected results... This is probably a limitation or bug in the JDBC driver. Please post details of your problem on [EMAIL PROTECTED] E.g. what results did you get, and what did you not get? So can anyone tell me how to query the system catalogs to extract this info?? The system catalogs are documented on http://www.postgresql.org/idocs/index.php?catalogs.html Regards, René Pijlman [EMAIL PROTECTED] ---(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] Status of index location patch
All, Just wondering what is the status of this patch. Is seems from comments that people like the idea. I have also looked in the archives for other people looking for this kind of feature and have found alot of interest. If you think it is a good idea for 7.2, let me know what needs to be changed and I will work on it this weekend. Thanks Jim ---(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]
Hi I saw in TODO CLIENTS * Add XML interface: psql, pg_dump, COPY, separate server and there's some code for JDBC in contrib/retep directory. Are there any plans to add xml support to postgresql, to return rown in formatted in xml for start? not only from psql, but from everywhere (e.g. php) I am (as time allows) adding to the xml under contrib/retep, but I don't know of anyone else working on it. Adding xml support to psql shouldn't be too difficult (it has html support already), and there is the ResultSet-XML stuff under contrib/retep. Peter -- Peter Mount [EMAIL PROTECTED] PostgreSQL JDBC Driver: http://www.retep.org.uk/postgres/ RetepPDF PDF library for Java: http://www.retep.org.uk/pdf/ ---(end of broadcast)--- TIP 4: Don't 'kill -9' the postmaster
[HACKERS]
Hi I saw in TODO CLIENTS * Add XML interface: psql, pg_dump, COPY, separate server and there's some code for JDBC in contrib/retep directory. Are there any plans to add xml support to postgresql, to return rown in formatted in xml for start? not only from psql, but from everywhere (e.g. php) I am (as time allows) adding to the xml under contrib/retep, but I don't know of anyone else working on it. Adding xml support to psql shouldn't be too difficult (it has html support already), and there is the ResultSet-XML stuff under contrib/retep. Peter -- Peter Mount [EMAIL PROTECTED] PostgreSQL JDBC Driver: http://www.retep.org.uk/postgres/ RetepPDF PDF library for Java: http://www.retep.org.uk/pdf/ ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
[HACKERS] querying system catalogs to extract foreign keys
I wanted to extract foriegn keys from the postgresql database related to each of the tables.. I tried to use the getImportedKeys and getExportedKeys of java.sql.DatabaseMetadata... But it didnt give any expected results... So can anyone tell me how to query the system catalogs to extract this info?? Thanx Jiby ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://archives.postgresql.org
Re: [HACKERS] [BUGS] Build problem with CVS version
John Summerfield writes: I'd point out this from the INSTALL document: --prefix=PREFIX Install all files under the directory PREFIX instead of /usr/local/pgsql. The actual files will be installed into various subdirectories; no files will ever be installed directly into the PREFIX directory. If you have special needs, you can also customize the individual subdirectories with the following options. But there are also exceptions listed at --with-perl and --with-python. This is entirely consistent with the way other software that uses the same configuration procedure. I am not aware of a package that installs general-purpose Perl/Python modules as well as items from outside of those environments. I contend that if a user wants different behaviour the onus is on the user to specify that. You're probably right, but I suspect that the majority of users rightly expect the Perl module to go where Perl modules usually go. This wouldn't that isn't reasonable if the installer's not root, and I wasn't, for the precise reason I didn't want to update the system. be such an interesting question if Perl provided a way to add to the module search path (cf. LD_LIBRARY_PATH and such), but to my knowledge there isn't a generally accepted one, so this issue would introduce an annoyance for users. from 'man perlrun' PERL5LIBA colon-separated list of directories in which to look for Perl library files before looking in the standard library and the current directory. Any architec- ture-specific directories under the specified locations are automatically included if they exist. If PERL5LIB is not defined, PERLLIB is used. When running taint checks (either because the program was running setuid or set- gid, or the -T switch was used), neither variable is used. The program should instead say: There are several other environment variables. Surely the current behaviour is an annoyance too, making the whole issue a rather unpleasant subject. ;-) Well, as soon as I come up with a name for the install-where-I-tell-you-to option, I'll implement it. The current behaviour makes it difficult to have two versions on one computer. -- Cheers John Summerfield Microsoft's most solid OS: http://www.geocities.com/rcwoolley/ Note: mail delivered to me is deemed to be intended for me, for my disposition. ---(end of broadcast)--- TIP 2: you can get off all lists at once with the unregister command (send unregister YourEmailAddressHere to [EMAIL PROTECTED])
Re: [HACKERS] System Tables
Peter Harvey writes: Are the table structures of the System Tables changed often? Only between major releases (if necessary). Have they changed from v7.1.1 and v7.1.2? No. -- Peter Eisentraut [EMAIL PROTECTED] http://funkturm.homeip.net/~peter ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html
Re: [HACKERS] syslog by default?
Bruce Momjian [EMAIL PROTECTED] writes: OK, that makes sense. My only question is how many platforms _don't_ have syslog. If it is only NT and QNX, I think we can live with using it by default if it exists. There seems to be a certain amount of confusion here. The proposal at hand was to make configure set up to *compile* the syslog support whenever possible. Not to *use* syslog by default. Unless we change the default postgresql.conf --- which I would be against --- we will still log to stderr by default. Given that, I'm not sure that Peter's argument about losing functionality is right; the analogy to readline support isn't exact. Perhaps what we should do is (a) always build syslog support if possible, and (b) at runtime, complain if syslog logging is requested but we don't have it available. regards, tom lane ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://archives.postgresql.org
[HACKERS] chunk size problem
I started getting these error messages webunl= \dt NOTICE: AllocSetFree: detected write past chunk end in TransactionCommandContext 3a4608 pqReadData() -- backend closed the channel unexpectedly. This probably means the backend terminated abnormally before or while processing the request. The connection to the server was lost. Attempting reset: Failed. ! The logs on the first times today I had these problems said this: Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-1] DEBUG: query: SELECT c.relname as Name, 'table'::text as Type, u.usename as Owner Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-2] FROM pg_class c, pg_user u Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-3] WHERE c.relowner = u.usesysid AND c.relkind = 'r' Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-4] AND c.relname !~ '^pg_' Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-5] UNION Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-6] SELECT c.relname as Name, 'table'::text as Type, NULL as Owner Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-7] FROM pg_class c Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-8] WHERE c.relkind = 'r' Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-9] AND not exists (select 1 from pg_user where usesysid = c.relowner) Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-10] AND c.relname !~ '^pg_' Sep 14 10:55:41 bugs postgres[1318]: [ID 748848 local0.debug] [12-11] ORDER BY Name Sep 14 10:55:42 bugs postgres[1318]: [ID 553393 local0.notice] [13] NOTICE: AllocSetFree: detected write past chunk end in TransactionCommandContext 3a4608 Sep 14 10:55:42 bugs postgres[1318]: [ID 553393 local0.notice] [14] NOTICE: AllocSetFree: detected write past chunk end in TransactionCommandContext 3a4608 Sep 14 10:55:42 bugs postgres[1318]: [ID 553393 local0.notice] [15] NOTICE: AllocSetFree: detected write past chunk end in TransactionCommandContext 3a4608 Sep 14 10:55:42 bugs postgres[1318]: [ID 553393 local0.notice] [16] NOTICE: AllocSetFree: detected write past chunk end in TransactionCommandContext 3a4608 Sep 14 10:55:42 bugs postgres[1318]: [ID 553393 local0.notice] [17] NOTICE: AllocSetFree: detected write past chunk end in TransactionCommandContext 3aadf0 Sep 14 10:55:42 bugs postgres[1318]: [ID 553393 local0.notice] [18] NOTICE: AllocSetFree: detected write past chunk end in TransactionCommandContext 3aadf0 Sep 14 10:55:42 bugs postgres[1318]: [ID 553393 local0.notice] [19] NOTICE: AllocSetFree: detected write past chunk end in TransactionCommandContext 3aadf0 Sep 14 10:55:42 bugs postgres[1318]: [ID 553393 local0.notice] [20] NOTICE: AllocSetFree: detected write past chunk end in TransactionCommandContext 3aadf0 Any idea? Some databases are screwed up Saludos... :-) -- Porqué usar una base de datos relacional cualquiera, si podés usar PostgreSQL? - Martín Marqués |[EMAIL PROTECTED] Programador, Administrador, DBA | Centro de Telematica Universidad Nacional del Litoral - ---(end of broadcast)--- TIP 4: Don't 'kill -9' the postmaster
Re: [HACKERS] [GENERAL] Where do they find the time??? Great Bridge closed now!!!??
peace_flower alavoor[AT]@yahoo.com writes: I hope the MySQL team will drop the development and Jump into PostgreSQL development. Pgsql going to be the only sql server to run the WORLD ECONOMY smoothly.. There is no time support and develop two duplicate products!! PostgreSQL is very advanced SQL server more advanced than mysql. What a coincidence. I was about to say the exact opposite. Obviously, PostgreSQL isn't the one true database and everyone should Jump into MySQL. It is easier to type. I hope your post was meant as a joke because it was hilarious. -- matthew rice [EMAIL PROTECTED] starnix inc. tollfree: 1-87-pro-linuxthornhill, ontario, canada http://www.starnix.com professional linux services products ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html
Re: [HACKERS] count of occurences PLUS optimisation
Sorry about the size of this message!, it covers several optimisation areas. Yes we are talking about a limited situation of ORDER BY (that does not match the GROUP BY order) plus LIMIT, but one that is easy to identify. It also has the advantage that the number to be LIMITed will 9 times out of 10 be known at query plan time (as LIMIT seems to mostly be used with a constant), so making it an optimization that rarely needs to estimate. It could even be tested for at the query run stage rather than the query plan stage in those cases where the limit is not known in advance, although that would make the explain less accurate. Probably for planning we should just assume that if a LIMIT is present that it is likely to be for a smallish number. The planner currently estimates that 10% of the tuples will be returned in these cases. The level up to which building a shorter list is better than a sort and keep/discard should be evaluated. It would perhaps depend on what proportion the LIMIT is of the estimated set returned by the GROUP BY. One point to note is that, IIRC, an ordered lists efficiency drops faster than that of most decent sorts once the data must be paged to/from disk. For larger LIMITs we should still get some benefits if we get the first LIMIT items, then sort just them and compare each new item against the lowest item in this list. Maybe form a batch of new items, then merge the new batch in to produce a new LIMIT n long sorted list and repeat. One major advantage to this is that as the new batch is being fetched we no longer need to keep the existing list in ram. I should think that each new batch should be no longer than we can fit in ram or the amount of ram that is best to enable an efficient list merge phase. We could kick into this second mode when we the LIMIT exceeds the cutoff or available ram. I have just noticed while looking through the planner and executor that the 'unique' node (SELECT DISTINCT [ON]) comes between the sort and limit nodes and is run seperately. Would it not be more efficient, in the normal case of distinct on ORDER BY order (or start of ORDER BY), for uniqueness to be handled within the the sorting as these routines are already comparing the tuples? Also if the unique node is seperate then it makes the merging of sort and limit impossible if DISTINCT is present. However there is still the case of distinct where a sort is not requested, needed (index scan instead?) or is not suitable for the distinct, so a seperate distinct node executor is still required. Taking all these into account it seems that quite a lot of code would need changing to implement this optimisation. Specifically the SORT, UNIQUE and LIMIT nodes (and their planners) and the sort utils would need a seperate variant and the current nodes would need altering. It is a pity as I would expect fairly large benefits in those cases of LIMITing to a small subset of a large dataset. Martijn van Oosterhout wrote: On Thu, Sep 13, 2001 at 05:38:56PM +0100, Thurstan R. McDougle wrote: What I am talking about is WHEN the sort is required we could make the sort more efficient as inserting into a SHORT ordered list should be better than building a BIG list and sorting it, then only keeping a small part of the list. For a plain SORT, it would be possible. Anything to avoid materialising the entire table in memory. Unfortunatly it won't help if there is a GROUP afterwards because the group can't really know when to stop. But yes, if you had LIMITSORT... you could do that. I can't imagine it would be too hard to arrange. In the example in question there would be perhaps 400 records, but only 10 are needed. From the questions on these lists it seems quite common for only a very low proportion of the records to be required (less then 10%/upto 100 typically), in these cases it would seem to be a usefull optimisation. Say you have a query: select id, count(*) from test group by id order by count desc limit 10; This becomes: LIMIT SORT GROUP SORT test The inner sort would still have to scan the whole table, unless you have an index on id. In that case your optimisation would be cool. Have I got it right now? -- Martijn van Oosterhout [EMAIL PROTECTED] http://svana.org/kleptog/ Magnetism, electricity and motion are like a three-for-two special offer: if you have two of them, the third one comes free. ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED] -- This is the identity that I use for NewsGroups. Email to this will just sit there. If you wish to email me replace the domain with knightpiesold . co . uk (no spaces). ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
[HACKERS] Where do they find the time??? Great Bridge closed now!!!??
Great Bridge ceased operation and not going to support postgreSQL (because of lack of investor) In these days of economic downturn, recession and world-wide economic depression...(and even the looming war) I am wondering how the MySQL team is finding time to support and develop duplicate SQL server products... I am NOT FINDING time even to fully understand every line of postgreSQL source code and use all the capabilities of POstgreSQL!!! I hope the MySQL team will drop the development and Jump into PostgreSQL development. Pgsql going to be the only sql server to run the WORLD ECONOMY smoothly.. There is no time support and develop two duplicate products!! PostgreSQL is very advanced SQL server more advanced than mysql. If they (mysql developers) have lot of time to waste, I can give them plenty of work at my home!! ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
