RE: RAC waitevent: gc freelist on one node

Not sure if it fits the case, but it's  worth taking a look at. From the
RAC FAQ:

 

What do I do if I see GC CR BLOCK LOST in my top 5 Timed Events in my
AWR Report?

 

You should never see this or BLOCK RETRY events. This is most likely due
to a fault in your interconnect network. Work with your system
administrator or/and network administrator to find the fault. Check
netstat -s

 

Ip:

84884742 total packets received

1201 fragments dropped after timeout

3384 packet reassembles failed

 

You do not want to see fragments dropped or packet reassemblies failed.

 

ifconfig -a:

 

eth0 Link encap:Ethernet HWaddr 00:0B:DB:4B:A2:04

inet addr:130.35.25.110 Bcast:130.35.27.255 Mask:255.255.252.0

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:21721236 errors:135 dropped:0 overruns:0 frame:95

TX packets:273120 errors:0 dropped:0 overruns:0 carrier:0

 

You do not want to see high number of errors.

 

Guillermo Alan Bort

DBA / DBA Main Team

 

EDS, an HP company

 

From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Ajay Thotangare
Sent: Friday, October 31, 2008 12:48 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: RAC waitevent: gc freelist on one node

 

Hi,

We have having a 3 node RAC and from last few days noticed performance
of 1 of node has degraded. In V$session session of that node, I always
see lot of sessions waiting on waitevent "gc freelist". I don't see this
wait event on other 2 nodes where performance is not affected.

Not sure if this wait event is indicating something. I could not find
any documentation on this wait event Can somebody please explain me this
wait event or point me to right document. Does this wait event looks
related to degraded performance?

Pls advice.

--Ajay

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