Re: pgsql is 75 times faster with my new index scan
От | Bruce Momjian |
---|---|
Тема | Re: pgsql is 75 times faster with my new index scan |
Дата | |
Msg-id | 200010171428.KAA21254@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Re: pgsql is 75 times faster with my new index scan (Hannu Krosing <hannu@tm.ee>) |
Список | pgsql-hackers |
> Bruce Momjian wrote: > > > > > > > I doubt everyone would like trading query speed for insert/update > > > > > speed plus index size > > > > > > > > If he is scanning through the entire index, he could do a sequential > > > > scan of the table, grab all the tid transaction status values, and use > > > > those when viewing the index. No need to store/update the transaction > > > > status in the index that way. > > > > > > Huh ? How ? It is how you do it now. Do you expect > > > load several milion transaction statuses into memory, > > > then scan index and lookup these values ? > > > Missed I something ? > > > devik > > > > > > > > > > Not sure. I figured they were pretty small values. > > IIRC the whole point was to avoid scanning the table ? Yes, sorry. -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania19026
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