这篇文章主要介绍oracle12c发生脑裂时哪个节点会存活，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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OracleDatabase-EnterpriseEdition-Version12.1.0.2andlaterInformationinthisdocumentappliestoanyplatform.Oracle企业版，从12.1.0.2和以后的版本，适用于任何平台。PURPOSE

Tounderstandthenewbehavior,from12.1.0.2,ofwhichnodewillsurvivewhensplitbraintakesplace.为了更好的理解从12.1.0.2以后的版本出现脑裂，哪个节点会存活下来。DETAILS

In11.2orevenolderversion,thelowestnumbernodewillsurvivewhensplitbraintakesplace,howeverthishaschangedin12.1.0.2withtheintroductionofnodeweight.Startedfrom12.1.0.2,duringsplitbrainresolution,nodewithhigherweightwillsurvive:--在11.2和之前的版本，当出现脑裂的时候，节点号小的会存活。但是从12.1.0.2以后发生了变化，引入了权重的概念，当出现脑裂的时候，权重高的节点会存活下来。

2014-11-24 14:25:41.140603 : CSSD:1117321536: clssnmrCheckNodeWeight: node(1) has weight stamp(0), pebble(0)
2014-11-24 14:25:41.140609 : CSSD:1117321536: clssnmrCheckNodeWeight: node(2) has weight stamp(311972654), pebble(3)
2014-11-24 14:25:41.140612 : CSSD:1117321536: clssnmrCheckNodeWeight: stamp(311972654), completed(1/2)
2014-11-24 14:25:41.140615 : CSSD:1117321536: clssnmrCheckSplit: Waiting for node weights, stamp(311972654)
2014-11-24 14:25:41.188880 : CSSD:1084811584: clssnmvDiskKillCheck: not evicted, file /dev/raw/raw2 flags 0x00000000, kill block unique 0, my unique 1416805718
2014-11-24 14:25:41.558921 : CSSD:1114167616: clssnmvDiskPing: Writing with status 0x3, timestamp 1416810341/1022717334
2014-11-24 14:25:41.731912 : CSSD:1086388544: clssnmvDHBValidateNCopy: node 1, node1, has a disk HB, but no network HB, DHB has rcfg 311972655, wrtcnt, 9527468, LATS 102 2717514, lastSeqNo 9527467, uniqueness 1416808381, timestamp 1416810341/1022722074
2014-11-24 14:25:41.731928 : CSSD:1086388544: clssnmvReadDskHeartbeat: manual shutdown of nodename node1, nodenum 1 epoch 1416810341 msec 1022722074
2014-11-24 14:25:41.732266 : CSSD:1117321536: clssnmrCheckNodeWeight: node(2) has weight stamp(311972654), pebble(3)
2014-11-24 14:25:41.732273 : CSSD:1117321536: clssnmrCheckNodeWeight: stamp(311972654), completed(1/1)
2014-11-24 14:25:41.732294 : CSSD:1117321536: clssnmCheckDskInfo: My cohort: 2
2014-11-24 14:25:41.732299 : CSSD:1117321536: clssnmRemove: Start
2014-11-24 14:25:41.732306 : CSSD:1117321536: (:CSSNM00007:)clssnmrRemoveNode: Evicting node 1, node1, from the cluster in incarnation 311972655, node birth incarnation 311972654, death incarnation 311972655, stateflags 0x225000 uniqueness value 1416808381 The number of the resource executing on each node and others are considered by the weight. Reference

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