Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL
| От | Bruce Momjian | 
|---|---|
| Тема | Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL | 
| Дата | |
| Msg-id | 200505272207.j4RM7cP26096@candle.pha.pa.us обсуждение исходный текст  | 
		
| Ответ на | Re: [PERFORM] "Hash index" vs. "b-tree index" (PostgreSQL (Neil Conway <neilc@samurai.com>) | 
| Список | pgsql-general | 
Added to TODO: * Consider sorting hash buckets so entries can be found using a binary search, rather than a linear scan * In hash indexes, consider storing the hash value with or instead of the key itself --------------------------------------------------------------------------- Neil Conway wrote: > Bruce Momjian wrote: > > Is there a TODO anywhere in this discussion? If so, please let me know. > > There are a couple: > > - consider changing hash indexes to keep the entries in a hash bucket > sorted, to allow a binary search rather than a linear scan > > - consider changing hash indexes to store each key's hash value in > addition to or instead of the key value. > > You should probably include a pointer to this discussion as well. > > (I'd like to take a look at implementing these if I get a chance.) > > -Neil > -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073
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