Re: [HACKERS] Is anyone aware of data loss causing MultiXact bugs in 9.3.2?

2014-02-19 Thread Andres Freund
On 2014-02-19 00:55:03 -0800, Peter Geoghegan wrote: > On Wed, Feb 19, 2014 at 12:40 AM, Andres Freund > wrote: > > Was there an index only scan or just a index scan? Any chance of a > > corrupted index? > > Just an index scan. I think it's unlikely to be a corrupt index, > because the customer

Re: [HACKERS] Is anyone aware of data loss causing MultiXact bugs in 9.3.2?

2014-02-19 Thread Peter Geoghegan
On Wed, Feb 19, 2014 at 12:40 AM, Andres Freund wrote: > Was there an index only scan or just a index scan? Any chance of a > corrupted index? Just an index scan. I think it's unlikely to be a corrupt index, because the customer said that he dropped and restored the index, and it's difficult to i

Re: [HACKERS] Is anyone aware of data loss causing MultiXact bugs in 9.3.2?

2014-02-19 Thread Andres Freund
On 2014-02-18 18:10:02 -0800, Peter Geoghegan wrote: > On Tue, Feb 18, 2014 at 5:50 PM, Alvaro Herrera > wrote: > > Peter Geoghegan wrote: > >> I've had multiple complaints of apparent data loss on 9.3.2 customer > >> databases. There are 2 total, both complaints from the past week, one > >> of wh

Re: [HACKERS] Is anyone aware of data loss causing MultiXact bugs in 9.3.2?

2014-02-18 Thread Peter Geoghegan
On Tue, Feb 18, 2014 at 5:50 PM, Alvaro Herrera wrote: > Peter Geoghegan wrote: >> I've had multiple complaints of apparent data loss on 9.3.2 customer >> databases. There are 2 total, both complaints from the past week, one >> of which I was able to confirm. The customer's complaint is that >> ce

Re: [HACKERS] Is anyone aware of data loss causing MultiXact bugs in 9.3.2?

2014-02-18 Thread Peter Geoghegan
On Tue, Feb 18, 2014 at 5:56 PM, Peter Geoghegan wrote: > That was my first suspicion, but then re-indexing didn't help, while > VACUUM FREEZE had the immediate effect of making both plans give a > consistent answer. I should add that this is an unremarkable int4 primary key (which was dropped an

Re: [HACKERS] Is anyone aware of data loss causing MultiXact bugs in 9.3.2?

2014-02-18 Thread Peter Geoghegan
On Tue, Feb 18, 2014 at 5:50 PM, Alvaro Herrera wrote: > The multixact bugs would cause tuples to be hidden at the heap level. > If the tuples are visible in a seqscan, then these are more likely to be > related to index problems, not multixact problem. That was my first suspicion, but then re-in

Re: [HACKERS] Is anyone aware of data loss causing MultiXact bugs in 9.3.2?

2014-02-18 Thread Alvaro Herrera
Peter Geoghegan wrote: > I've had multiple complaints of apparent data loss on 9.3.2 customer > databases. There are 2 total, both complaints from the past week, one > of which I was able to confirm. The customer's complaint is that > certain rows are either visible or invisible, depending on wheth