Hello list, I have a question , what does Grock mean in Oracle RAC CSS? I always find some Grock associated info from ocssd.log, like below: " 2011-04-29 04:00:19.056: [ CSSD][1076291904]clssgmQueueShare: (0x2aaab001a980) target global grock DBPROD member 0 type 1 queued from client (0x2aaab00cbd60), global grock DBPROD, refcount 12 2011-04-29 04:00:19.063: [ CSSD][1076291904]clssgmQueueShare: (0x2aaab0133fd0) target local grock DG_LOCAL_DATA member 0 type 1 queued from client (0x2aaab0150760), local grock DG_LOCAL_DATA, refcount 11" I have searched this word, but no exactly result. Maclean Liu Oracle Database Administrator Oracle Certified Master <http://www.youyus.com>