Comments for Usn's IT Blog

Comment on Oracle 11.2: Cursor Mutex S wait event and too many (2^30) child cursors by Pawel Wadas

Pawel Wadas — Sat, 25 May 2013 17:49:51 +0000

Thank you for posting this info Martin – it helped me a lot with similar problem :)

Comment on Oracle SQL Developer connection storm at startup by Mane

Mane — Wed, 10 Apr 2013 15:21:04 +0000

the according thread on oracle-l (http://www.freelists.org/post/oracle-l/Unwanted-SQL-Developer-inverse-connection-storming) made my day. Thanks :-)

Comment on Oracle SQL Developer connection storm at startup by usn

usn — Wed, 10 Apr 2013 14:51:07 +0000

Oh. it’s fixed:

> Add this to your sqldeveloper.conf file and it will no longer to the
> tnsping on startup.
> AddVMOption -Dsqldev.tnsping=false
>
> Also you should know if you do a ‘reconnect’ in SQL Developer we do a
> TNSPing first to see if it’s even worth bothering to try to make the
> connection.

Thanks to Jeff Smith!

Comment on Oracle SQL Developer connection storm at startup by usn

usn — Fri, 05 Apr 2013 14:45:29 +0000

From the follow-up correspondence I come to the conclusion that the development team is now aware of this issue and may fix it in next or one of the next release(s).

Enjoy
Martin

Comment on Oracle 11g JDBC driver hangs blocked by /dev/random – entropy pool empty by Usn’s IT Blog » Oracle 11g JDBC driver hangs blocked by /dev/random – entropy pool empty | Webscalability

Thu, 04 Apr 2013 14:49:38 +0000

[...] Usn’s IT Blog » Oracle 11g JDBC driver hangs blocked by /dev/random – entropy pool empty. [...]

Comment on Oracle SQL Developer connection storm at startup by usn

usn — Thu, 04 Apr 2013 11:17:48 +0000

Here a quick answer from the oracle-l mailing list by Jeff D. Smith:

==================
So that was put in to collect ping times for connections, with the
intent at some point of displaying that visually for users.

So you could see what databases were ‘far away.’

Obviously that last bit was never implemented, but we could do it for
the next release. Any thoughts on whether that would be of use to you or
your users?

My thought is that we should collect that on CONNECT time, not for all
connections defined in the tool at startup time, as you have noticed.

And since we’re getting ready with a new release, now is a good time to
address this.

Jeff
==================
Thread / Source:
http://www.freelists.org/post/oracle-l/Unwanted-SQL-Developer-inverse-connection-storming

Comment on Oracle Grid Infrastructure: UDEV fixing ORA-15081: failed to submit an I/O operation to a disk by Martin Klier

Martin Klier — Tue, 26 Mar 2013 15:30:44 +0000

Some recent Linux’es don’t like the short parameter form. For example Oracle Enterprise Linux 6.4 takes the following format:

udevadm info –query=all –path=/sys/block/sda

Good guessing
Martin

Comment on Oracle 11g JDBC driver hangs blocked by /dev/random – entropy pool empty by Rakesh

Rakesh — Thu, 28 Feb 2013 06:48:04 +0000

Thank you very much for this information. Saved me tons of time trying to debug this.

Comment on Oracle Grid Infrastructure: 11.2.0.3.5 PSU on AIX: gipchaLowerRecv: invalid message header hdr by usn

usn — Thu, 14 Feb 2013 13:50:14 +0000

There seems to be a known issue on AIX:
http://www-01.ibm.com/support/docview.wss?uid=isg1IV35888&myns=apar&mynp=DOCTYPEcomponent&mync=E

Oracle suggested to apply an APAR:
AIX 6.1 TL08 SP01
APAR IV35888: UDP MULTICAST: SHORT PACKET FOR SOME LISTENERS. 13/02/08 PTFPECHANGE

We applied the APAR, but did not go for PSU 5 again yet. Will comment the results here as soon as we did.

Martin

Comment on Oracle Grid Infrastructure / ASM – ERROR: failed to update diskgroup resource ora.DATA.dg by Jan Schampera

Jan Schampera — Tue, 08 Jan 2013 18:54:00 +0000

!!!!! O.R.A.C.L.E. !!!!!

:-)