Merlin Moncure <mmoncure@gmail.com> writes:
> On 11/14/05, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> Do the "duplicate" rows appear to be independent insertions, or
>> successive states of the same logical row?
> esp=# select xmin, xmax, lastmod from parts_order_line_file where
> prl_combined_key =
> esp-# ' 00136860' and prl_seq_no in (20, 23);
> xmin | xmax | lastmod
> -----------+------+-------------------------
> 584527952 | 0 | 2005-09-15 11:17:17.062
> 584527961 | 0 | 2005-09-15 11:17:17.187
> (2 rows)
I think you need to try this with enable_indexscan = 0; it should be
showing us 4 rows according to your prior result, and it's only showing
2, which suggests that the indexscan is short-circuiting because it
"knows" there can only be 1 result row. Also, since you're probing for
more than one primary key value, please include the pkey columns in the
query so we can tell what's what...
regards, tom lane
