Re: Pluggable Indexes

> 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/