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What are the restrictions on the SID with an Oracle RAC database? Is it limited to 5 characters?

April 26, 2017characters database limited Oracle RAC SID

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What are the restrictions on the SID with an Oracle RAC database? Is it limited to 5 characters?

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The SID prefix in 10g Release 1 and prior versions was restricted to five characters by install/config tools so that an ORACLE_SID of upto max of 5+3=8 characters can be supported in an Oracle RAC environment. The SID prefix is relaxed up to 8 characters in 10g Release 2, see bug4024251 for more information. With Oracle RAC 11g Release 2, SIDs in Oracle RAC with Policy Managed database are dynamically allocated by the system when the instance starts. This supports a dynamic grid infrastructure which allows the instance to start on any server in the cluster.