ibatis-user-java mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From jochen <songzhou...@gmail.com>
Subject Re: help to reduce db round-trip
Date Fri, 12 Jun 2009 02:47:00 GMT
I know the situation that the reliable check is to validate connection by
executing simple SQL query; Actually we used the simple SQL - select 1 from
dual, but the total soft parse is 48%, and 700 queries per second happened
from oracle awr report, which certainly would bring impact to db
performance; Currently we are looking for some workaround to reduce the
frequency of SQL query, Of course, we can reduce the connection borrowing in
order to get transactions down; that is the way which can be used;

I wonder if any other workaound exist to make our db performance better,
more is better for your poor db performance,

On Wed, Jun 10, 2009 at 6:12 PM, Nicholoz Koka Kiknadze

> I think the only reliable way to check whether connection is valid is to
> execute something using the connection (so it requires roundtrip to db).
> However
> a) this execution happens only once for your transaction (which may include
> numbers of CRUD operations etc)
> b) Validation query is chosen to be simple (like select 1 from dual for
> oracle), so that performance penalty is minimal.
> So IMO unless you are designing some realtime application you can stop
> worrying about additional roundtrip stealing maybe a dozen of
> milliseconds...
> On Wed, Jun 10, 2009 at 7:35 AM, jochen <songzhou.cn@gmail.com> wrote:
>> Hi all,
>> When I was using the "validationQuery" and "testOnBorrow" properties to
>> ensure connection works fine, did it mean two round-trip happened?
>> Validation query and my SQL query? thus, how to reduce the db round-trip
>> while the query became huge?
>> I knew iBatis to mysql would not ensure connection valid while disabling
>> testOnBorrow, if it is the same toward oracle? is there any workaound to
>> reduce db round-trip? any help is appreciated, thanks.
>> Best regards,
>> Joe

View raw message