> What other constraints are there on such non-in-core indexex? Early (2005)
> GIST indexes were very painful in production environments because vacuuming
> them held locks for a *long* time (IIRC, an hour or so on my database) on
> the indexes locking out queries. Was that just a shortcoming of the
> implementation, or was it a side-effect of them not supporting recoverability.
GiST concurrent algorithm is based on Log Sequence Number of WAL and that was
the reason to implement WAL (and recoverability) first in GiST.
--
Teodor Sigaev E-mail: teodor@sigaev.ru
WWW: http://www.sigaev.ru/
