| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Peter Geoghegan <pg(at)heroku(dot)com> |
| Cc: | Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Is anyone aware of data loss causing MultiXact bugs in 9.3.2? |
| Date: | 2014-02-19 01:50:35 |
| Message-ID: | 20140219015035.GA4759@eldon.alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
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 whether an
> index scan is used or a sequential scan (I confirmed this with an
> EXPLAIN ANALYZE).
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.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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