Ühel kenal päeval, K, 2006-02-01 kell 18:08, kirjutas Tom Lane: > Hannu Krosing <[EMAIL PROTECTED]> writes: > > Does ALTER TABLE SET TABLESPACE lock the table > > It had better ... see nearby discussion about relaxing locking for > TRUNCATE.
Is it some recent disussion ? > Exactly the same problem that at commit we'd be cutting > the ground out from under any concurrent query. Can't we just keep READ locks and reopen the datafile from its new location before releasing it ? Does our shared memory page cache implementation track logical or physical pages ? If it's just logical pages, then moving the physical storage around below should not affect it. Of course there are problems with WAL/PITR which *have* to deal with physical storage, but this should be mostly unrelated. -------------- Hannu ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match