2008/2/29, Tom Lane <[EMAIL PROTECTED]>: > ITAGAKI Takahiro <[EMAIL PROTECTED]> writes: > > BTW, why REINDEX requires access exclusive lock? Read-only queries > > are forbidden during the operation now, but I feel they are ok > > because REINDEX only reads existing tuples. Can we do REINDEX > > holding only shared lock on the index? > > No. When you commit the reindex, the old copy of the index will > instantaneously disappear; it will not do for someone to be actively > scanning that copy.
Can a shared lock be taken at first, and when the new index is ready, in order to delete the old index, elevate that lock to an exclusive one? Markus -- Markus Bertheau Blog: http://www.bluetwanger.de/blog/ ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
