Re: PostgreSQL win32 fragmentation issue
От | Joshua D. Drake |
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Тема | Re: PostgreSQL win32 fragmentation issue |
Дата | |
Msg-id | 1165077244.18923.3.camel@localhost.localdomain обсуждение исходный текст |
Ответ на | Re: PostgreSQL win32 fragmentation issue (Martijn van Oosterhout <kleptog@svana.org>) |
Ответы |
Re: PostgreSQL win32 fragmentation issue
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Список | pgsql-hackers |
On Sat, 2006-12-02 at 14:31 +0100, Martijn van Oosterhout wrote: > On Fri, Dec 01, 2006 at 10:58:44PM -0800, Joshua D. Drake wrote: > > I know this isn't *our* fault :) but I am curious if there is anything > > we can do about the way postgresql writes files to help limit fragmentation. > > > > Essentially, this makes win32 impossible in a 24x7 environment (jokes > > aside about Win32 in general) because we *have* to defrag on Windows and > > Windows won't defrag open files (thus anything PostgreSQL is using). > > I thought fragmentation was something that disappeared with the FAT > filesystem. Isn't NTFS smart enought o avoid fragmentation in the first > place? Nope... you still have the good old defrag command (well button now). > BTW, do you know what 11% fragmentation means? Does that mean each file > is on average split in 9 pieces, because for a 1GB file, 9 pieces isn't > all that bad. No, the report had Total Fragmentation, and File Fragmentation. I was reporting on Total, which I assume is some aggregation. My concern is that this is over a single bench run. I could imagine that after a week or two weeks of stead PostgreSQL use, the IO would gradually get worse and worse. Joshua D. Drake > > Have a nice day, -- === The PostgreSQL Company: Command Prompt, Inc. === Sales/Support: +1.503.667.4564 || 24x7/Emergency: +1.800.492.2240 Providing the most comprehensive PostgreSQL solutions since 1997 http://www.commandprompt.com/ Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate
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