AW: JDBC and MTS

Hi Regis

That's basically right. As I just posted, we use MTS for development, so that not every developer starts up a local connection pool on their workstation and we also don't end up with too many dedicated server processes.
But I think you're right saying that MTS and application side connection pooling is pretty much redundant, if not even the source for trouble.
a) the app server should start and monitor the connection pool. b) the client sessions (or app threads within the app server or whatever) request connections from that pool.
c) important aspect here is the fact that the app server "thinks" that it maintains a pool of readily available, permanent connections. The clients (or whoever) will just be passed a reference to a certain connection. After they are finished with what they want to do, they put the connection back into the pool (plus some connection re-aquiring mechanism for dead clients and the like).
d) That means, that with MTS, a new player shows up, as in the connections held in the connection pool are not permanent (or dedicated in oracle terms). That might lead to some latency while fetching a valid connection from the pool and using it, because when you actually start using it, you end up with some overhead since the dispatcher has to "give" you a connection.
e) I don't know for sure, but has anybody ever testet some of the new features like sharing prepared statements between connections (and the possibility to tag a name to a statement for further information / statement fetching) with MTS ?

So, I think it's either MTS OR Java Connection Pooling, not BOTH.

Open for bashing,
Stefan

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-----Ursprüngliche Nachricht-----
Von: Regis Biassala [mailto:[EMAIL PROTECTED] Gesendet: Dienstag, 17. Juni 2003 16:15
An: Multiple recipients of list ORACLE-L Betreff: RE: JDBC and MTS

We add:
1. Application (Java)
Using a JDBC Connection Pooling (CP)feature...

2. Database
Oracle in MTS, pooling or not pooling enabled

This was not good for us...so we kept the Java pooling side of the app and Oracle configured to run in dedicated mode.

We'got a XML policy file which disables JDBC connection pooling for our application and gives the DBA a choice to configure a MTS... So in our case we two scenarios:

1. DB(MTS) and app(without CP) this is OK
2. DB(dedicated) and app(with CP)

Regis

-----Original Message-----
Sent: Tuesday, June 17, 2003 1:25 PM
To: Multiple recipients of list ORACLE-L

OK. Let me get some things straight:
a) I'm not a developer. I'm one of those vile creatures called DBAs.

    I don't program. I troubleshoot other people's programs. Other people     program, I nag. When developers start writing bug-free software which

uses the database in the most optimal way, my job is gone. b) The whole problem is that even after specifying SRVR=DEDICATED in the

    connect string, the darned thing still connects as an MTS connection. c) What was the issue that you faced? That was my original question.

On 2003.06.17 07:09, Regis Biassala wrote:
> Richard is right...If ur Java application uses it own connection
> pooling...then do not use MTS...it slows down connections and more...We
> faced the same issue here....
>
> Our configuration allows DBA to choose weather connection pooling should
> handled by the app or the database...
> Use dedicated servers if there's noway you can disable the application
> connection pooling...
>
>
> Regis
>
> -----Original Message-----
> Sent: Tuesday, June 17, 2003 6:05 AM
> To: Multiple recipients of list ORACLE-L
>
>
> I used to seen problems with JDBC Thin with MTS on Linux and switching to
> a dedicated connection seemed to fix the problem. But JDBC Thin and MTS
> worked fine on my Solaris box. Not sure with HP-UX. Is the Java
> application
> running on an Application Server?
>
> Richard Ji
>
> -----Original Message-----
> Sent: Monday, June 16, 2003 11:25 PM
> To: Multiple recipients of list ORACLE-L
>
>
> I'm not a Java expert so please forgive me my ignorance. JDBC application
> is facing very strange performance problems during connect. Every now and
> then
> everything appears to be hung and then, 10 minutes later, users proceed
> normally but with the elevated blood pressure and serious lack of
patience.
> I was told that JDBC has it's own connection pooling mechanism and that it
> will start it's own dedicated server connection. It seems though that the
> string "SRVR=DEDICATED" has been ignored and that users are acquiring a
> shared
> server connection.
> Does anybody in this group have any experience with JDBC and MTS? Version
is
> 8.1.7.1, 64 bit on HP-UX 11 with OPS. Dispatchers are cross-registered
with
> listeners on all 4 nodes for load balancing purposes. I found surprisingly
> little material on the Metalink. No network collisions, no retransmits, no
> timeouts can be seen from netstat -i and netstat -s. The NIC is 1GB
Ethernet
> and I would be very surprised if approximately 100 users could kill it
with
> a
> JDBC application. They could use DBA as a human sacrifice, though.
>
>
>
> --
> Mladen Gogala
> Oracle DBA
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Mladen Gogala
> INET: [EMAIL PROTECTED]
>
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-- 
Mladen Gogala
Oracle DBA
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Mladen Gogala
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-- 
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Stefan Jahnke
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