Re: multiple threads inserting into the same table

On Mon, Mar 23, 2009 at 2:25 PM, Brian Cox <brian(dot)cox(at)ca(dot)com> wrote:
> Tom Lane [tgl(at)sss(dot)pgh(dot)pa(dot)us] wrote:
>>
>> pg_stat_activity says those five threads are doing nothing except
>> sitting around with open transactions.  You sure you don't have a bug on
>> the application side?
>>
>>                        regards, tom lane
>
> This is a java app. A thread dump reveals that these 5 threads are all
> asleep on a socket read to postgres (see below). DbUtils.java:2265 is:
>
> session.connection().createStatement() .executeUpdate(((DatabaseInsert)
> insertObject).getInsertStmt(session));
>
> This generates and executes a single SQL insert. Since, as you point out,
> postgres seems to think that this transaction isn't doing anything,
> it's hard to figure out what the read is doing.

Might you have a firewall that's killing the connections? What does
netstat -an on the client side say about these connections?