Re: [GENERAL] [HACKERS] How to change order sort of table in HashJoin

2016-11-20 Thread Man
Thanks for response, sir. On 11/20/2016 1:18 AM, Tom Lane wrote: Man Trieu writes: As in the example below, i think the plan which hash table is created on testtbl2 (the fewer tuples) should be choosen. The planner usually prefers to hash on the table that has a flatter MCV histogram, since

Re: [GENERAL] [HACKERS] How to change order sort of table in HashJoin

2016-11-21 Thread Man
Thanks for reply, sir. On 11/21/2016 1:39 AM, Tom Lane wrote: Man writes: Additional information. In 9.6 the second table (lesser tuple) was choosen (the same testdata). There are something (cost estimation?) different in previous versions. I'd bet on different statistics in th

[GENERAL] search_path not reloaded via unix socket connections

2015-09-17 Thread Kong Man
Can anybody explain why the search_path setting, with several config reloads, would not change via local connections? We struggled with our production settings on Postgres 9.3 today, only to realize, after a while, that the search_path change actually took effect via TCP/IP, but not unix socket

Re: [GENERAL] search_path not reloaded via unix socket connections

2015-09-18 Thread Kong Man
resql.org > Subject: Re: [GENERAL] search_path not reloaded via unix socket connections > Date: Thu, 17 Sep 2015 22:29:04 -0400 > > Kong Man writes: > > Can anybody explain why the search_path setting, with several config > > reloads, would not change via local co

Re: [GENERAL] search_path not reloaded via unix socket connections

2015-09-18 Thread Kong Man
il.com > CC: pgsql-general@postgresql.org > Subject: Re: [GENERAL] search_path not reloaded via unix socket connections > Date: Thu, 17 Sep 2015 22:29:04 -0400 > > Kong Man writes: > > Can anybody explain why the search_path setting, with several config > > re

[GENERAL] How to change order sort of table in HashJoin

2016-11-18 Thread Man Trieu
Hi Experts, As in the example below, i think the plan which hash table is created on testtbl2 (the fewer tuples) should be choosen. Because creating of hash table should faster in testtbl2. But it did not. I have tried to change the ordering of table by tuning parameter even if using pg_hint_plan

[GENERAL] Queues Problem

2010-06-08 Thread uaca man
Hello my fellow postgreSQL gurus. I´m a user of postgresSQL of quite some time now, but most of my experience is consuming database, and for the current project we are without a proper DBA and they have to bear with me and so I must seek advice. I have a list of building and a queue and the user

[GENERAL] Queues Problem

2010-06-08 Thread uaca man
Hello my fellow postgreSQL gurus. I´m a user of postgresSQL of quite some time now, but most of my experience is consuming database, and for the current project we are without a proper DBA and they have to bear with me and so I must seek advice. I have a list of building and a queue and the user

Re: [GENERAL] Queues Problem

2010-06-08 Thread uaca man
and not one hour late because the user will lose the bonus for one hour. 2010/6/8 Andy Colson > On 6/8/2010 11:53 AM, uaca man wrote: > >> Hello my fellow postgreSQL gurus. I´m a user of postgresSQL of quite >> some time now, but most of my experience is consuming database, and

Re: [GENERAL] Queues Problem

2010-06-08 Thread uaca man
What do you mean? That is what I think I am trying to do. No? 2010/6/8 Vick Khera > On Tue, Jun 8, 2010 at 12:53 PM, uaca man wrote: > > Lets say for a 20 thousand users server, it may have at most 20 thousand > > constructions started at the same time. > > > > To ac

Re: [GENERAL] Queues Problem

2010-06-08 Thread uaca man
ng beyond comprehension of a human mind(al least for my mind) and that was when I had the super idea, lest put the queue on the crontab! Looks like we are going to cut off a few options of the game. ps: do i top post or bottom post here? 2010/6/8 Peter Hunsberger > On Tue, Jun 8, 2010 at

Re: [GENERAL] Queues Problem

2010-06-08 Thread uaca man
2010/6/8 Peter Hunsberger > On Tue, Jun 8, 2010 at 1:26 PM, uaca man wrote: > >> 2) Think of the front end as changing states as the user interacts > >> with it, then figure out what queries need to be made to correspond to > >> the changes in state. For example,

Re: [GENERAL] Queues Problem

2010-06-09 Thread uaca man
2010/6/8 Oliver Kohll - Mailing Lists > On 8 Jun 2010, at 20:12, uaca man wrote: > > > 2) Think of the front end as changing states as the user interacts > > with it, then figure out what queries need to be made to correspond to > > the changes in state. > > >

[GENERAL] Using postgresql in situation with high write/read ratio

2010-08-12 Thread Odd Man
Hi, In my current project we have unusual (at least for me) conditions for relation db, namely: * high write/read ratio (writes goes from bulk data updates/inserts (every couple or minutes or so)) * loosing some recent part of data (last hour for example) is OK, it can be easy restored First vers

[GENERAL] select from pipe-delimited field

2010-08-23 Thread san man
Hello all, I am trying to do a SELECT operation with a WHERE condition. However, the column with which I am trying to do the comparison has several values which are pipe-delimited. I want to return a match(true) if the WHERE condition matches any of the bar-delimited values. For example, SELECT i

Re: [GENERAL] select from pipe-delimited field

2010-08-23 Thread san man
. Arjen's solution(haven't tried yet) looks better to me. -Neel On Mon, Aug 23, 2010 at 5:59 PM, Arjen Nienhuis wrote: > On Tue, Aug 24, 2010 at 12:44 AM, san man wrote: > >> Hello all, >> >> I am trying to do a SELECT operation with a WHERE condition. Howe

[GENERAL] ERROR: cannot execute nextval() in a read-only transaction

2011-05-11 Thread Dae-man Yang
I upgrade postgresql from 8.4.2 to 9.0.4. But I have one problem. The Error message 'cannot execute nextval() in a read-only transaction' Please help me. [Version 8.4.2] DEVDB=# select version(); version -