threads listlengths 1 275 |
|---|
[
{
"msg_contents": "Recently I've wrote few pgSql procedures that generates invoices and \nstore it in postgres table. Small test has shown that there is \nperformance problem. I've thought that string operation in pgsql are not \nperfect but it has appeared that 90% of time program waste on very \nsimple update... |
[
{
"msg_contents": "\"Also sprach Kenneth Marshall:\"\n> > Surprise, ... I got a speed up of hundreds of times. The same application\n> > that crawled under my original rgdbm implementation and under PG now\n> > maxed out the network bandwidth at close to a full 10Mb/s and 1200\n> > pkts/s, at 10% CPU on my 70... |
[
{
"msg_contents": "TOASTed means storage outside of the main table. But AFAIK, only rows bigger 2K are considered for toasting.\n\nAndreas\n\n-- Ursprüngl. Mitteil. --\nBetreff:\tRe: My quick and dirty \"solution\" (Re: [PERFORM] Performance Problem with Vacuum of bytea table (PG 8.0.13))\nVon:\tBastian Voigt <... |
[
{
"msg_contents": "Greetings,\n\nWe have two servers running pgsql -- an older server running 8.2.3, \nand a newer (far superior) one running 8.2.4. One of our reporting \nqueries is running painfully slowly on 8.2.4, but it executes in a \nreasonable timeframe on 8.2.3. Below, I've included a contrived, ... |
[
{
"msg_contents": "\"Also sprach Kenneth Marshall:\"\n> improvement from coalescing the packets. Good luck in your investigations.\n\nWhile I am recompiling stuff, just some stats.\n\nTypical network traffic analysis during the PG runs:\n\n Total Packets Processed 493,499\n Unicast 100.0% 493,417... |
[
{
"msg_contents": "I have a busy postgresql server running running on a raid1 of 2 15k rpm\nscsi drives.\n\nI have been running into the problem of maxed out IO bandwidth. I would\nlike to convert my raid1 into a raid10 but that would require a full\nrebuild which is more downtime than I want so I am looking in... |
[
{
"msg_contents": "We're thinking of building some new servers. We bought some a while back that have ECC (error correcting) RAM, which is absurdly expensive compared to the same amount of non-ECC RAM. Does anyone have any real-life data about the error rate of non-ECC RAM, and whether it matters or not? In ... |
[
{
"msg_contents": "Since PITR has to enable archiving does this not increase the amount \nof disk I/O required ?\n\nDave\n",
"msg_date": "Mon, 28 May 2007 08:45:38 -0400",
"msg_from": "Dave Cramer <pg@fastcrypt.com>",
"msg_from_op": true,
"msg_subject": "PITR performance costs"
},
{
"ms... |
[
{
"msg_contents": "Hi \n\nI am currently running a vacuum analyse through PgAdmin on a PostgreSQL\n8.1.9 database that takes forever without doing anything: no\n(noticeable) disk activity or (noticeable) CPU activity. \n\nThe mesage tab in PgAdmin says:\n\n...\nDetail: 0 index pages have been deleted, 0 are cur... |
[
{
"msg_contents": "hi,\n\nthis is not really postgresql specific, but any help is appreciated.\ni have read more spindles the better it is for IO performance.\n\nsuppose i have 8 drives , should a stripe (raid0) be created on\n2 mirrors (raid1) of 4 drives each OR should a stripe on 4 mirrors\nof 2 drives each... |
[
{
"msg_contents": "Hi All,\n\nI have a very slow left outer join that speeds up by more then 1000\ntimes when I turn set enable_seqscan=off. This is not the query I\nactually do in my application, but is a simplified one that singles out\nthe part that is really slow. All of the columns involved in the query\... |
[
{
"msg_contents": "Hi,\n\tafter doing the \"dd\" tests for a server we have at work I obtained:\nRead: 47.20 Mb/s\nWrite: 39.82 Mb/s\n\tSome days ago read performance was around 20Mb/s due to no readahead in md0 \nso I modified it using hdparm. However, it seems to me that being it a RAID1 \nread speed could be... |
[
{
"msg_contents": "It's created when the data is written to both drives.\n\nThis is standard stuff, very well proven: try googling 'self healing zfs'.\n\n- Luke\n\nMsg is shrt cuz m on ma treo\n\n -----Original Message-----\nFrom: \tMichael Stone [mailto:mstone+postgres@mathom.us]\nSent:\tWednesday, May 30, 200... |
[
{
"msg_contents": "I have a question regarding \"connection for xxyy established\" The situation\nbelow shows records being added to 3 tables which are heavily populated. We\nnever \"update\" any table, only read from them. Or we delete a full-day worth\nof records from them.\n\nThe question is: Is this method... |
[
{
"msg_contents": "Can you help me appending two table values into single table without\nperforming INSERT?\nNote that these tables are of same schema.\n\nIs there any sql command is supported?\n\nThanks,\nHanu\n\n\nOn 5/29/07, Alvaro Herrera <alvherre@commandprompt.com> wrote:\n>\n> Michal Szymanski wrote:\n> ... |
[
{
"msg_contents": "Hello,\n\nI am going to build a new PostgreSQL dedicated server, on FreeBSD. Before it goes to production \nservice I need to make some tests and take configuration decisions, focused on my application needs. \nUsual thing. One of them is selection of one of 32 or 64 bit versions of both OS a... |
[
{
"msg_contents": "Folks,\n\njust wanted to share some benchmark results from one long performance\nstudy comparing MySQL, PostgreSQL and Oracle transactions throughput\nand engine scalability on T2000 and V890 (under Solaris). Oracle\nresults are removed (of course :), but other are quite interesting...\nFindi... |
[
{
"msg_contents": "Hi,\nI'm having some problems in performance in a simple select count(id)\nfrom.... I have 700 000 records in one table, and when I do:\n\n# explain select (id) from table_name;\n-[ RECORD 1 ]----------------------------------------------------------------\nQUERY PLAN | Seq Scan on table_name... |
[
{
"msg_contents": "Hello List,\n\nWe've been running PostgreSQL as our web application database for\nalmost a year and it has noticeably slowed down over last few months.\n\nOur current setup and pgsql configuration looks like this:\n\n8.1.2 on Ubuntu 4 on Opteron Dual Core with 2 GBytes RAM. This is a\ndedicat... |
[
{
"msg_contents": "Hello great gurus of performance:\nOur 'esteemed' Engr group recently informed a customer that in their testing, \nupgrading to 8.2.x improved the performance of our J2EE \napplication \"approximately 20%\", so of course, the customer then tasked me \nwith upgrading them. We dumped their db, ... |
[
{
"msg_contents": "When you initdb, a config file is edited from the template by initdb to reflect your machine config.\n\n- Luke\n\nMsg is shrt cuz m on ma treo\n\n -----Original Message-----\nFrom: \tDouglas J Hunley [mailto:doug@hunley.homeip.net]\nSent:\tSunday, June 03, 2007 02:30 PM Eastern Standard Time\... |
[
{
"msg_contents": "Absolutely!\n\nA summary of relevant comments so far are:\n- enable-mergejoin\n- shared-buffers\n- fsync\n\nAnother to consider if you use indexes is random-page-cost.\n\nWhat would be helpful is if you could identify a slow query and post the explain analyze here.\n\nThe concurrent performan... |
[
{
"msg_contents": "Hi,\n\nI'm currently playing with dbt2 and am wondering, if the results I'm \ngetting are reasonable. I'm testing a 2x Dual Core Xeon system with 4 GB \nof RAM and 8 SATA HDDs attached via Areca RAID Controller w/ battery \nbacked write cache. Seven of the eight platters are configured as one... |
[
{
"msg_contents": "I have several thousand clients. Our clients do surveys, and each survey\nhas two tables for the client data,\n\n responders\n responses\n\nFrequent inserts into both table.\n\nRight now, we are seeing significant time during inserts to these two\ntables.\n\nSome of the indices in tableA... |
[
{
"msg_contents": "Does anyone have any experience running pg on multiple IBM 3950's set \nup as a single machine ?\n\nDave\n",
"msg_date": "Mon, 4 Jun 2007 22:00:09 -0400",
"msg_from": "Dave Cramer <pg@fastcrypt.com>",
"msg_from_op": true,
"msg_subject": "postgresql running on a virtual cluste... |
[
{
"msg_contents": "I have some questions about the performance of certain types of SQL \nstatements.\n\nWhat sort of speed increase is there usually with binding parameters \n(and thus preparing statements) v. straight sql with interpolated \nvariables? Will Postgresql realize that the following queries are ... |
[
{
"msg_contents": "Hi,\n\nexplain analyze SELECT am.campaign_id, am.optimize_type,\nam.creative_id, am.optimize_by_days, am.impressions_delta,\nam.clicks_delta, am.channel_code, am.cost,dm.allocation_map_id,\nSUM(CASE dm.sqldate when 20070602 then dm.impressions_delivered else 0\nend) as deliv_yest, SUM(CASE si... |
[
{
"msg_contents": "I have a table:\nwebdigest=# \\d wd_urlusermaps\n锟斤拷 \"public.wd_urlusermaps\"\n锟街讹拷锟斤拷 | 锟斤拷锟斤拷 | 锟斤拷锟轿达拷\n---------+-----------------------------+-------------------------------------------------------------\nid | integer | not null default nextval('wd_urlusermaps_id_seq'::regclass)\nurlid ... |
[
{
"msg_contents": "Hi there,\n\nWe run a small ISP with a FreeBSD/freeradius/postgresql 8.2.4 backend\nand 200+ users. Authentication happens via UAM/hotspot and I see a lot\nof authorisation and accounting packets that are handled via PL/PGSQL\nfunctions directly in the database.\n\nEverything seems to work 10... |
[
{
"msg_contents": "Question,\n\nDoes (pg_stat_get_db_blocks_fetched(oid)-pg_stat_get_db_blocks_hit(oid)*8) =\nnumber of KB read from disk for the listed database since the last server\nstartup?\n\nThanks,\n\nChris\n\nQuestion,Does (pg_stat_get_db_blocks_fetched(oid)-pg_stat_get_db_blocks_hit(oid)*8) = number of... |
[
{
"msg_contents": "Our usage pattern has recently left me with some very bloated database clusters. \n I have, in the past, scheduled downtime to run VACUUM FULL and tried CLUSTER \nas well, followed by a REINDEX on all tables. This does work, however the \nexclusive lock has become a real thorn in my side. ... |
[
{
"msg_contents": "Gang,\n\nI'm running a mid-size production 8.0 environment. I'd really like \nto upgrade to 8.2, so I've been doing some testing to make sure my \napp works well with 8.2, and I ran across this weirdness. I set up \nand configured 8.2 in the standard way, MacOSX Tiger, current \npatches... |
[
{
"msg_contents": "Hello,\n\n\nPostgres: 8.2\nos: Linux 4CPU, 4 GB RAM, Raid 1, 32 bit system\nwork_mem: 600 Mb\n\n\nI have some tables which may become quite large (currently up to 6 Gb) .\nI initially fill them using copy from (files) .\n\nThe import is fast enough as I only have a primary key on the table:\n... |
[
{
"msg_contents": "On a FreeBSD system, is page size for shared_buffers calculation 8K? And is\npage size for shmall calculation 4K? The documentation hints at these\nvalues. Anyone know?\n\n-- \nYudhvir Singh Sidhu\n408 375 3134 cell\n\nOn a FreeBSD system, is page size for shared_buffers calculation 8K?\nAnd ... |
[
{
"msg_contents": "About six months ago, our normally fast postgres server started \nhaving performance issues. Queries that should have been instant were \ntaking up to 20 seconds to complete (like selects on the primary key \nof a table). Running the same query 4 times in a row would yield \ndramatically ... |
[
{
"msg_contents": "Hey All,\n\nI have a table, let's call it A, whose primary key, a_id, is referenced\nin a second table, let's call it B. For each unique A.a_id there are\ngenerally many rows in B with the same a_id. My problem is that I want\nto delete a row in A when the last row in B that references it i... |
[
{
"msg_contents": "Hi all,\n\nI had a database which uses to hold some 50 Mill records and disk\nspace used was 103 GB. I deleted around 34 Mill records but still the\ndisk size is same. Can some on please shed some light on this.\n\nThank in advance for all the help.\n\nDhawal Choksi\n\n",
"msg_date": "Fri... |
[
{
"msg_contents": "I need some help. I have started taking snapshots of performance of my\ndatabases with concerns to io. I created a view on each cluster defined as:\n SELECT pg_database.datname AS database_name,\npg_stat_get_db_blocks_fetched(pg_database.oid) AS blocks_fetched,\npg_stat_get_db_blocks_hit(pg... |
[
{
"msg_contents": "Is it possible that providing 128G of ram is too much ? Will other \nsystems in the server bottleneck ?\n\nDave\n",
"msg_date": "Fri, 8 Jun 2007 12:31:47 -0400",
"msg_from": "Dave Cramer <pg@fastcrypt.com>",
"msg_from_op": true,
"msg_subject": "How much ram is too much"
},
... |
[
{
"msg_contents": "Hi,\n\n\nWhile monitioring we noticed that there are no details in the pg_statistics\nfor a particular table. Can you let us know what might be the reason? Also\nwhat steps can be taken care for adding the statistics?\n\nNote: The queries which are running on this table are taken longer time ... |
[
{
"msg_contents": "Hi all,\n\nIt seems that I have an issue with the performance of a PostgreSQL server.\n\nI'm running write-intensive, TPC-C like tests. The workload consist of \n150 to 200 thousand transactions. The performance varies dramatically, \nbetween 5 and more than 9 hours (I don't have the exact fi... |
[
{
"msg_contents": "Hi All,\n\nI really hope someone can shed some light on my problem. I'm not sure if\nthis is a posgres or potgis issue.\n\nAnyway, we have 2 development laptops and one live server, somehow I\nmanaged to get the same query to perform very well om my laptop, but on\nboth the server and the oth... |
[
{
"msg_contents": "Hi all,\n\nIt seems that I have an issue with the performance of a PostgreSQL server.\n\nI'm running write-intensive, TPC-C like tests. The workload consist of \n150 to 200 thousand transactions. The performance varies dramatically, \nbetween 5 and more than 9 hours (I don't have the exact fi... |
[
{
"msg_contents": "Configuration\nOS: FreeBSD 6.1 Stable\nPostgresql: 8.1.4\n\nRAID card 1 with 8 drives. 7200 RPM SATA RAID10\nRAID card 2 with 4 drives. 10K RPM SATA RAID10\n\nBesides having pg_xlog in the 10K RPM drives what else can I do to best use \nthose drives other than putting some data in them?\n\nIo... |
[
{
"msg_contents": "Good day,\n\nI have noticed that my server never uses indexing. No matter what I do.\n\nAs an example I took a table with about 650 rows, having a parentid\nfield with an index on parentid.\n\nEXPLAIN ANALYZE\nSELECT *\n FROM layertype\nwhere parentid = 300;\n\nOn my laptop the explain analy... |
[
{
"msg_contents": "Hi all,\n\n I have a server with 4GB of memory and I'm tweaking the PostgreSQL \nconfiguration. This server will be dedicated to run PostgreSQL so I'd \nlike to dedicate as much as possible RAM to it.\n\n I have dedicated 1GB to shared_buffers (shared_buffers=131072) but \nI'm not sure if... |
[
{
"msg_contents": "Hi there,\n\nUsing explicitly VACUUM command give me the opportunity to fine tune my \nVACUUM scheduling parameters, after I analyze the log generated by VACUUM \nVERBOSE.\n\nOn the other hand I'd like to use the auto-vacuum mechanism because of its \nfacilities. Unfortunately, after I made s... |
[
{
"msg_contents": "Hi All,\n\nIs there some kind of performance testing utility available for\npostgresql Something I can run after installing postgresql to help me\nidentify if my installation is optimal.\n\nI've been battling for days now trying to sort out performance issues\nand something like that may just... |
[
{
"msg_contents": "Hi,\nI've a table with 300 000 records and I'm trying to do a search:\n\nSELECT * FROM addresses WHERE address ILIKE '%Jean Paul%' AND\n(l_pc='4250' or r_pc='4250') AND (l_struc='O' or r_struc='O') AND\n(prenm ILIKE 'Street')\n\nIt performs in 2 seconds in a dual Xeon 2.4mhz with 2Gb of RAM.\... |
[
{
"msg_contents": "Hi,\n\nI'm doing WAL shipping to do a warm standby system (8.2.4).\n\nThe problem is that the pg_xlog dir on the master just gets bigger and\nbigger (never seems to truncate) and the corresponding archive directory on\nthe slave also gets bigger and bigger. Is there a way to moderate this?\n\... |
[
{
"msg_contents": "\n \nHello everybody,\n\nWe're using PostgreSQL 8.1.0 on AIX 5.3 through NFS (a Netapp Filer hosts the database files), and we're encoutering somes issues with vaccums. PostgreSQL binaries are built with xlc 6 (C for AIX Compiler 6.0.0.6) on AIX 5.2 (yes, I know, building on 5.2 and running o... |
[
{
"msg_contents": "I am trying to update a field in one table with a\nfield from another table like:\n\nupdate co set\nfirest_id=fco.firest_id,fire_dist=fco.fire_dist from\nfco where co.xno=fco.xno\n\nTable co has 384964 records\nTable fco has 383654 records\n\nThe xno fields in both tables are indexed but they... |
[
{
"msg_contents": "Hi there,\n\nI'd like to understand completely the report generated by VACUUM VERBOSE.\nPlease tell me where is it documented ?\n\nTIA,\nSabin \n\n\n",
"msg_date": "Thu, 14 Jun 2007 17:31:26 +0300",
"msg_from": "\"Sabin Coanda\" <sabin.coanda@deuromedia.ro>",
"msg_from_op": true,
... |
[
{
"msg_contents": "Looking for replication solutions, I find:\n\nSlony-I\n Seems good, single master only, master is a single point of failure,\n no good failover system for electing a new master or having a failed\n master rejoin the cluster. Slave databases are mostly for safety or\n for parallelizing qu... |
[
{
"msg_contents": "Looking for replication solutions, I find:\n\nSlony-I\n Seems good, single master only, master is a single point of failure,\n no good failover system for electing a new master or having a failed\n master rejoin the cluster. Slave databases are mostly for safety or\n for parallelizing querie... |
[
{
"msg_contents": "Ok, slony supports two kinds of operation here: failover (which moves the master node to a new one without the old master node being present, it also drops the old node from replication) and move set (which moves the master node with cooperation)\n\nThe usecases for these two are slightly dif... |
[
{
"msg_contents": "Hello i would like to know if not determining a max size value for a character\nvarying's fields decrease the perfomance (perhaps size of stockage ? or\nsomething else ?)\n\nIf not it is a good way to not specify a max size value ?\nIf it has an importance is it possible to have a general env... |
[
{
"msg_contents": "I am a Java Software architect, DBA, and project manager for the\nUniversity of Illinois, Department of Web Services. We use PostgreSQL\nto serve about 2 million pages of dynamic content a month; everything\nfrom calendars, surveys, forms, discussion boards, RSS feeds, etc. I am\nreally imp... |
[
{
"msg_contents": "Hello from Paris\nI am DBA for Oracle and beginner on Postgres. For an company in France, I\nmust make a comparative study, between Postgres and Oracle. Can you send any\nuseful document which can help me.\nScalability ? Performance? Benchmark ? Availability ? Architecture ?\nLimitation : use... |
[
{
"msg_contents": "Hi,\n\nI have an application which really exercises the performance of \npostgresql in a major way, and I am running into a performance \nbottleneck with Postgresql 8.1 that I do not yet understand.\n\nHere are the details:\n\n- There is a primary table, with some secondary tables\n- The prin... |
[
{
"msg_contents": "Hello,\n\nWe have installed postgres 8.2.0\n\ndefault time zone which postgres server using is\n\ntemplate1=# SHOW timezone;\n TimeZone\n-----------\n ETC/GMT-5\n(1 row)\n\n\nBut we want to set this timezone parameter to IST.\nOur system timezone is also in IST. We are using solaris.\n\nPleas... |
[
{
"msg_contents": "Hi list members,I have a question regarding hardware issues for a SDI (Spatial data infrastructure). It will consist of PostgreSQL with PostGIS and a UMN Mapserver/pmapper set up.At our institute we are currently establishing a small GIS working group. The data storage for vector data should ... |
[
{
"msg_contents": "Gang,\n\nHoping you all can help me with a rather bizarre issue that I've run \nacross. I don't really need a solution, I think I have one, but I'd \nreally like to run it by everyone in case I'm headed in the wrong \ndirection.\n\nI'm running a small Slony (v1.1.5)/postgresql 8.0.4 clust... |
[
{
"msg_contents": "Please read the whole email before replying:\n\n \n\nI love the feedback I have received but I feel that somehow I did not\ncommunicate the intent of this mini project very well. So let me\noutline a few basics and who the audience was intended for.\n\n \n\n \n\nMini project title:\n\nInitia... |
[
{
"msg_contents": "Below is a link to the HTML JavaScript configuration page I am creating:\n\n \n\nhttp://www.webservices.uiuc.edu/postgresql/\n\n \n\nI had many suggestions. Based on the feedback I received, I put\ntogether the initial list of questions. This list of questions can be\nchange.\n\n \n\nMemory... |
[
{
"msg_contents": "Now I am at the difficult part, what parameters to calculate and how to\ncalculate them. Everything below has to do with PostgreSQL version 8.2:\n\n \n\nThe parameters I would think we should calculate are:\n\nmax_connections\n\nshared_buffers\n\nwork_mem\n\nmaintenance_work_mem\n\neffective... |
[
{
"msg_contents": "\n\tI have this \"poll results\" table with just 3 integer fields, which is \nnever updated, only inserted/deleted...\n\tDid the Devs consider an option to have VACUUM reduce the row header \nsizes for tuples that are long commited and are currently visible to all \ntransactions ? (even if... |
[
{
"msg_contents": "Hi\n\nI'd like to know how to get information about which PG entities are in\nkernel cache, if possible.\n\n-- \nRegards,\nSergey Konoplev\n",
"msg_date": "Wed, 20 Jun 2007 16:44:02 +0400",
"msg_from": "\"Sergey Konoplev\" <gray.ru@gmail.com>",
"msg_from_op": true,
"msg_subjec... |
[
{
"msg_contents": "Hello group\n\nI have a problem with a simple index scan using the primary key of a table\ntaking too long.\n\nRelevant facts:\npg version 7.3.4 (yeah very old, we are upgrading asap)\n\npostgresql.conf:\nshared_buffers = 25000\nrandom_page_cost = 2\neffective_cache_size = 200000\nsort_mem = ... |
[
{
"msg_contents": "Hello all,\n\none of my customers installed Postgres on a public server to access the data\nfrom several places. The problem is that it takes _ages_ to transfer data from\nthe database to the client app. At first I suspected a problem with the ODBC\ndriver and my application, but using pgAdm... |
[
{
"msg_contents": "Hi there,\n\nReading different references, I understand there is no need to vacuum a \ntable where just insert actions perform. So I'm surprising to see a table \nwith just historical data, which is vacuumed at the nightly cron with a \nsimple VACUUM VERBOSE on about 1/3 of indexes amount.\n\... |
[
{
"msg_contents": "We recently upgraded a very large database (~550 GB) from 8.1.4 to 8.2.4 via\na pg_dump and pg_restore. (Note that the restore took several days.) We\nhad accepted the default settings:\n\nvacuum_freeze_min_age = 100 million\nautovacuum_freeze_max_age = 200 million\n\nDue to our very high t... |
[
{
"msg_contents": "I can't seem to find a definitive answer to this.\n\nIt looks like Postgres does not enforce a limit on the length of an SQL\nstring. Great. However is there some point at which a query string becomes\nridiculously too long and affects performance? Here's my particular case:\nconsider an I... |
[
{
"msg_contents": "Hi -\n I'm looking at ways to do clean PITR backups. Currently we're \npg_dumping our data in some cases when compressed is about 100GB. \nNeedless to say it's slow and IO intensive on both the host and the \nbackup server.\n\n All of our databases are on NetApp storage and I have been... |
[
{
"msg_contents": "I have a query that runs about 30-50 seconds. The query is a join between 2 tables (customer and address), each table with about 400,000 rows. My customer table has fields like first_name and last_name where the address table has city, state, etc. I'm using \"like\" in most of the query co... |
[
{
"msg_contents": "\n\tSuppose a web application with persistent database connections.\n\tI have some queries which take longer to plan than to execute !\n\n\tI with there was a way to issue a PREPARE (like \"PERSISTENT PREPARE\").\n\tNow all Postgres connections would know that prepared statement foo( $1, \n$... |
[
{
"msg_contents": "Well, that's not completely trivial => the plan might depend upon the concrete value of $1,$2 and $3.\n\nAndreas\n\n-- Ursprüngl. Mitteil. --\nBetreff:\t[PERFORM] PREPARE and stuff\nVon:\tPFC <lists@peufeu.com>\nDatum:\t\t23.06.2007 21:31\n\n\n\tSuppose a web application with persistent datab... |
[
{
"msg_contents": "Hello, I am wondering if it is safe to assume that\nspecifying cio mount option is safe with PostgreSQL.\n\nAs far as I understand the CIO (AIX Concurrent I/O) means that\nfilesystem does not serialize access to file blocks. In other\nwords multiple threads can simultaneously read and write\... |
[
{
"msg_contents": "We have a search facility in our database that uses full text indexing to\nsearch about 300,000 records spread across 2 tables. Nothing fancy there.\n\nThe problem is, whenever we restart the database (system crash, lost\nconnectivity to SAN, upgrade, configuration change, etc.) our data is ... |
[
{
"msg_contents": "Hey All,\n\nI am testing upgrading our database from version 8.1 to 8.2. I ran our\nworst performing query on this table, an outer join with an \"is null\"\ncondition, and I was happy to see it ran over four times faster. I also\nnoticed the explain analyze showed the planner chose to do se... |
[
{
"msg_contents": "Sorry to repost this, but I forgot the subject the first time around.\n\nHey All,\n\nI am testing upgrading our database from version 8.1 to 8.2. I ran our\nworst performing query on this table, an outer join with an \"is null\"\ncondition, and I was happy to see it ran over four times faste... |
[
{
"msg_contents": "Hi,\n\n \n\nIn version 8.1.5, I have an rtree index on a 1.5 GB table. The size of\nthis index is 500 MB. After migrating to 8.2.3, the size of this index\nhas increased to 35GB. I've dropped are recreated the index and got the\nsame result. In 8.2.3 the index type is gist, does this have... |
[
{
"msg_contents": "I was wondering if you guys have some suggested settings for our server, i\nthink we are not hardware limited but the configureation is set up\nincorrectly. For some reason our database seems to have trouble handling\n10+ inserts per second which seems to be a pretty trivial load for this\nh... |
[
{
"msg_contents": "Hi all,\n\nI'm trying to do an update of a reasonably large table and it's taking \nway too long so I'm trying to work out why and if I need to tweak any \nsettings to speed it up.\n\nThe table is around 3.5 million records.\n\nThe query is\n\nupdate table set domainname=substring(emailaddres... |
[
{
"msg_contents": "Hi,\n\n I am new for postgresql server. And now i work on a projects which\nrequires postgreSQL 8.0 and Java. I don't know why the server occasionally\nslow down a bit for every 3 minutes.\nI have changed the log configuration so that it logs all statement\ntransaction > 1000 ms and the res... |
[
{
"msg_contents": "Two points:\n\n* need more information about the circumstances.\n\n* could it be that autovaccum hits you?\n\nAndreas\n\n-- Ursprüngl. Mitteil. --\nBetreff:\t[PERFORM] PostgreSQL 8.0 occasionally slow down\nVon:\t\"Ho Fat Tsang\" <namiwf@gmail.com>\nDatum:\t\t28.06.2007 06:56\n\nHi,\n\n I a... |
[
{
"msg_contents": "Hi,\n\nI am new to PostgreSQL database. Can anybody help me (or point me the\nrelated post) to install PostgreSQL on windows XP from command line.\n(From .bat file)\n\n \n\nThanks\n\nSachi\n\n \n\n \n\n\n\n\n\n\n\n\n\n\nHi,\nI am new to PostgreSQL database. Can anybody help me (or\npoint me t... |
[
{
"msg_contents": "Hi,\n\nI have found some discussions about that issue, but did not find the\nanswer actually.\n\nIs there a way to be sure, that some indexes are alway in memory? My\ntests bringing them to the memory based file system (ramfs) tablespace\nshowed really a very significant performance gain. But... |
[
{
"msg_contents": "Hi all,\n\n I need a very urgent help from you all in below case.\n\n I have a query\n\n SELECT amp.campaign_id, dam.allocation_map_id,amp.optimize_type,\namp.optimize_by_days, amp.rate, amp.action_id,amp.actions_delta,\namp.vearned_today, amp.creative_id, amp.channel_code,SUM(CASE\ndam.... |
[
{
"msg_contents": "I have the same schema in two different databases. In \"smalldb\", the two tables of interest have about 430,000 rows, in \"bigdb\", the two tables each contain about 5.5 million rows. I'm processing the data, and for various reasons it works out well to process it in 100,000 row chunks. H... |
[
{
"msg_contents": "Hi,\n I've dbase with about 80 relations.\n On deleting a user, this cascades through all the tables.\n This is very slow, for 20 users it takes 4 hours, with exclusive \naccess to the dbase.\n No other users connected to the dbase.\n\n Ok I know there will be somewhere a relat... |
[
{
"msg_contents": "All,\n\nI'm very curious to know if we may expect or guarantee any data\nconsistency with WAL sync=OFF but using file system mounted in Direct\nI/O mode (means every write() system call called by PG really writes\nto disk before return)...\n\nSo may we expect data consistency:\n - none?\n ... |
[
{
"msg_contents": "\nThis query is taking less than 5 minutes on 7.4 but over 5 hours on 8.1...\n\nPostgreSQL 8.1.4 on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC)\n4.1.0 (SUSE Linux)\nTotal runtime: 20448310.101 ms = 5.6800862 hour\n(132 rows)\n\n--postgresql.conf:\n\nshared_buffers = 114688 ... |
[
{
"msg_contents": "Hi\n\nI have the following scenario for a database that I need to design, and\nwould like some hints on what to improve or do differently to achieve the\ndesired performance goal, disregarding hardware and postgres tuning.\n\nThe premise is an attribute database that stores about 100 differen... |
[
{
"msg_contents": "\nHello,\nHow can I know my PostgreSQL 8 is using direct I/O or buffered I/O? If using buffered I/O, how can I enable direct I/O? What is the performance difference of them?\nThis is urgent, Thanks.\n_________________________________________________________________\nWindows Live Spaces is her... |
[
{
"msg_contents": "\nHello,\nI have seen some performance testing indicates that apparently the PostgreSQL 8 is faster in writing data while seems like Oracle 10g is better in reading data from database, can any one tell me why? Or is there anyone done performance benchmark on them before?\nThis is urgent.\nTha... |
[
{
"msg_contents": "Hi all,\n\n I have the following scenario, I have users and groups where a user \ncan belong to n groups, and a group can have n users. A user must belogn \nat least to a group. So when I delete a group I must check that there \nisn't any orphan. To do this I have something like that:\n\n ... |
[
{
"msg_contents": "Hello all,\n\nI think this result will be useful for performance discussions of \npostgresql against other databases.\n\nhttp://www.spec.org/jAppServer2004/results/res2007q3/\n\nMore on Josh Berkus's blog:\n\nhttp://blogs.ittoolbox.com/database/soup/archives/postgresql-publishes-first-real-be... |
[
{
"msg_contents": "Hi List,\n\nIs there anyway so as to indicate the Query Analyser not to use the\nplan which it is using regularly, and use a new plan ?\n\n From where do the Query Analyser gets the all info to prepare a plan?\nIs it only from the pg_statistics table or are there anyother tables\nwhich have t... |
[
{
"msg_contents": "Hello,\n\nI have a simple table id/value, and a function that returns the id of a\ngiven value, inserting the later if not yet present. The probability\nthat a value already exist within the reference table is very high.\n\nDifferent db users may have their own reference table with different\... |
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