Re: Can't Figure Out Where Rows Are Going

Turn PITR on
Restore database to the state immediately after transaction is commited and
look for rows presence.

Andrus.


"HH" <lists@lastonepicked.com> wrote in message
news:C082766B.DD7B9%lists@lastonepicked.com...
> Hello,
>
> I am running 8.1.3, built from source, on RHEL4/x64.
>
> I have a Web application that uses this database to sell products. We have
> an order table and an order lines table with a one to many relationship
> between them.
>
> For the past few months I have had a strange problem where sometimes
> (about
> 2% of orders), the line item rows disappear. By disappear I mean that they
> are committed to the database and then when I go to look at the order
> later,
> there are no line items. The row in the 'order' table still exists, it is
> just the line(s) that vanish.
>
> As I started looking into this problem I assumed that it was a bug in my
> Web
> application. I did some extensive testing and logging to no avail. I
> turned
> up the logging on my Web app and I can see the INSERTs but I never saw any
> DELETE statements though I can't find the child row(s) in the DB.
>
> I've been perplexed for quite some time so a few days ago I turned on the
> following PG logging:
>
> log_statement = 'mod'
>
> Today, I found an order that has this problem. Grepping my serverlog, I
> see
> the following:
>
> The line item is inserted:
>
> serverlog:LOG:  statement: INSERT INTO order_lines ("order_description",
> "order_id", "updated_at", "band_name", "order_item", "product_id",
> "line_source", "order_quantity", "extended_price", "unit_price",
> "catalog_number", "created_at") VALUES('FW "Not My Pres" Trucker Hat',
> 16899, '2006-05-06 14:43:38', NULL, 'Baseball Cap ', 165, 'Merch', 1,
> NULL,
> 7.0, 94, '2006-05-06 14:43:38')
>
> Then, I do a SELECT:
>
> fw_production=# SELECT COUNT(*) FROM order_lines WHERE order_id = 16899;
> count
> -------
>     0
>
> There was about 3 hours between when the line was inserted and when I went
> to look for it. There is no DELETE in the serverlog for this row.
>
> I can't figure out where this row went and why it disappeared! Is it
> getting
> deleted some other way that wouldn't be logged? Am I missing something
> rudimentary?
>
> Any help is appreciated.
>
> Hunter
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
>       choose an index scan if your joining column's datatypes do not
>       match
>