Re: Latest version of Hot Standby patch: unexpected error querying standby

Mark Kirkwood wrote:
> Simon Riggs wrote:
>> On Sun, 2009-01-04 at 21:03 +1300, Mark Kirkwood wrote:
>>
>>
>>> bench=# \d history
>>> Table "public.history"
>>> Column | Type | Modifiers
>>> --------+-----------------------------+-----------
>>> tid | integer |
>>> bid | integer |
>>> aid | integer |
>>> delta | integer |
>>> mtime | timestamp without time zone |
>>> filler | character(22) |
>>>
>>> bench=# select now(),count(*) from history;
>>> ERROR: could not open relation base/16384/16394: No such file or
>>> directory
>>>
>>
>> >From my recreating your test case, the oids are consistent with the
>> History table. So the cache looks good.
>>
>> md.c should be cacheing the file descriptor so the second use of the
>> file should not be reopening it. I've not touched smgr/md so a missing
>> file error is a surprise.
>>
>> I wonder if this is an error associated with large file handling and
>> file forks? Smells like an FSM or VM error.
>>
>> Is the file actually missing? i.e. ls -l mydatadir/base/16384/16394*
>>
>>
> Yeah -
> $ ls -l $PGDATA/base/16384/16394*
> ls: /data0/pgslave/8.4/base/16384/16394*: No such file or directory
>

This might be useful:

the other tables in the dataset (accounts, branches, tellers) all
behave as expected:

bench=# select now(),count(*) from branches;
now | count
-------------------------------+-------
2009-01-04 22:17:00.298597+13 | 100
(1 row)

I'm guessing something tied up with the fact that history has no rows to
start with...