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Does Oracle RAC work with NTP (Network Time Protocol)?

April 26, 2017Network NTP Oracle Protocol RAC time

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Does Oracle RAC work with NTP (Network Time Protocol)?

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YES! NTP and Oracle RAC are compatible, as a matter of fact, it is recommended to setup NTP in an Oracle RAC cluster, for Oracle 9i Database, Oracle Database 10g, and Oracle Database 11g Release 1. With Oracle Database 11g Release 2, Oracle Clusterware includes the Cluster Time Synchronization Service (CTSS). On startup, Oracle Clusterware checks for a NTP configuration, if found, CTSS goes into Observer mode. This means it will monitor the clock synchronization and report in the Oracle Clusterware alert log if it finds a problem. If it does not find a NTP configuration, CTSS will be active. In active mode, CTSS synchronizes all the system clocks to the first node in the cluster. From the Documentation: Oracle® Database Oracle Clusterware and Oracle Real Application Clusters Installation Guide 10g Release 2 (10.2) for Linux B14203-05 page 2-21: “Node Time Requirements Before starting the installation, ensure that each member node of the cluster is set as closely as possible to the same