"Tom Lane" <[EMAIL PROTECTED]> writes: > What it sounds is utterly unsafe. You can get away with not WAL-logging > individual bit flips (that is, hint-bit-setting) because either state of > the page is valid. If I read this proposal correctly it is to change > t_ctid without WAL-logging, which means that a partial page write (torn > page syndrome) could leave the page undetectably corrupted --- t_ctid > is 6 bytes and could easily cross a hardware sector boundary.
Well we would never be overwriting the blockid, only the posid which is 2 bytes. And the ctid (and posid) should always be 4-byte aligned. So actually it would never cross a hardware sector boundary. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com ---------------------------(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
