RE: RAC waitevent: gc freelist on one node
- From: "Bort, Guillermo" <guillermo.bort@xxxxxxx>
- To: <ajayoraclel@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 31 Oct 2008 10:08:14 -0500
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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