Re: [GENERAL] Re: Perfomance decreasing
On Fri, Aug 17, 2001 at 02:09:33PM +0600, Ivan Babikov wrote: In this case, however, I think he may be understating too much. I read the original question as PostgreSQL is not useful for production systems. Call me melodramatic if you like: you are probably right. The point, I guess, is this: it would be really useful to have a document somewhere that honestly described the limitations of (the current version of) PostgreSQL. Do you mean Postgres becomes very weak when the size of a database achieves 1.5Gb or something close to it? Maybe this is one of typical questions, but I have heard people complaining that Postgres is just for quite small bases. Now we have to choose a free database for then inexpensive branch of our project and Interbase looks better at capability to work with quite big bases (up to 10-20Gb). I am not sure now that Postgres will work with bases greater than 10Gb, what does All think? Thanks in advance, Ivan Babikoff. In my experience postgresql has no problems with big databases. I have had several problems but they had to do with the os and hardware not the db. - Einar Karttunen ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html
Re: [GENERAL] Re: Perfomance decreasing
On Friday 17 August 2001 15:09, Ivan Babikov wrote: In this case, however, I think he may be understating too much. I read the original question as PostgreSQL is not useful for production systems. Call me melodramatic if you like: you are probably right. The point, I guess, is this: it would be really useful to have a document somewhere that honestly described the limitations of (the current version of) PostgreSQL. Do you mean Postgres becomes very weak when the size of a database achieves 1.5Gb or something close to it? Maybe this is one of typical questions, but I have heard people complaining that Postgres is just for quite small bases. Now we have to choose a free database for then inexpensive branch of our project and Interbase looks better at capability to work with quite big bases (up to 10-20Gb). I am not sure now that Postgres will work with bases greater than 10Gb, what does All think? I do not see any problems. It works for me, and I have no problems. The only problem you could have is with vacuum. It is solvable anyway. But if you have not so much updates it is not an issue too (I mean if do not update more than 25% of DB each day). Actually for anyone listening for such advices I would recommend to create a test installation, and stress test it before go to production. Interbase has its own problems. -- Sincerely Yours, Denis Perchine -- E-Mail: [EMAIL PROTECTED] HomePage: http://www.perchine.com/dyp/ FidoNet: 2:5000/120.5 -- ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
[GENERAL] Re: Perfomance decreasing
Tom Lane wrote: I'm doing vacuum periodically (once a hour), but perfomance still falls down. It sounds to me like you may be running into index growth problems. VACUUM is presently not good about shrinking indexes. I always enjoy Tom's comments - he is the master of understatement and always helpful. In this case, however, I think he may be understating too much. I read the original question as PostgreSQL is not useful for production systems. Call me melodramatic if you like: you are probably right. The point, I guess, is this: it would be really useful to have a document somewhere that honestly described the limitations of (the current version of) PostgreSQL. Don't use inheritance, don't use on 24x7 systems, whatever. It doesn't have to be fancy formatting, a brain-dump to a text file would be excellent (This is a hint, Tom et al!! :-)) If you drop and recreate the indexes used by your most important queries, does the performance go back to where it was? For what it's worth: I observed a similar issue and found that a dump and restore of all the databases helped. I haven't tried just recreating the index. I'll try it out and maybe post a test script to reproduce the issue. (where?) --- Allan. ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://www.postgresql.org/search.mpl
