* Josh Berkus (j...@agliodbs.com) wrote: > 1) I've confirmed at the 2nd site that the issue doesn't happen if > pg_stat_statements.so is not loaded. So this seems to be confirmation > that either auto_explain, pg_stat_statements, or both need to be loaded > (but not necessarily created as extensions) in order to have the issue.
Interesting... > 2) I've been unable to reproduce the issue using a naive test case, but > I'll keep trying. Thanks. > 3) The XID information is interesting. > > a) I've confirmed that this is a case of having multiple row versions > rather than allowing a duplicate PK to be inserted. > > b) the end result of this corruption is XIDs which go backwards: > > xmin | xmax | ctid | step_id | workitem_id | status > ---------+---------+-----------+---------+-------------+--------- > 3362707 | 3362707 | (6177,31) | 1 | 446469 | pending > 3362710 | 3362707 | (6177,32) | 1 | 446469 | working > > 5520953 | 5520953 | (5064,105) | 1 | 727946 | pending > 5520954 | 5520953 | (5064,108) | 1 | 727946 | working > > What's additionally problematic is that the current snapshot minxid is > in the 9000000 range, so it's not clear why any of the above rows are > visible at all. Can you get the infomask bits..? What's does pg_controldata report wrt the MultiXid's? THanks, Stephen
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