RE: RAC waitevent: gc freelist on one node

From: Bort, Guillermo <>
Date: Fri, 31 Oct 2008 10:08:14 -0500
Message-ID: <>

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  


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: Bcast: Mask:


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  

[] On Behalf Of Ajay Thotangare Sent: Friday, October 31, 2008 12:48 PM
Subject: RAC waitevent: gc freelist on one node  


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.


-- Received on Fri Oct 31 2008 - 10:08:14 CDT

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