5M问一下oracle rac理论上最多可以有几个节点，有什么依据吗？有官方文档说明的吗？
128个，根据(Doc ID 220970.1)
RAC: Frequently Asked Questions (RAC FAQ)
Technically and since Oracle RAC 10g Release 2, 100 nodes are supported in one cluster.
This includes running 100 database instances belonging to the same
(production) database on this cluster, using the Oracle Database
Enterprise Edition (EE) with the Oracle RAC option and Oracle
Clusterware only (no third party / vendor cluster solution underneath).
When using a third party / vendor cluster software the following limits apply (subject to change without notice):
Solaris Cluster: 8
HP-UX Service Guard: 16
HP Tru64: 8
IBM AIX:
* 8 nodes for Physical Shared (CLVM) SSA disk
* 16 nodes for Physical Shared (CLVM) non-SSA disk
* 128 nodes for Virtual Shared Disk (VSD)
* 128 nodes for GPFS
* Subject to storage subsystem limitations
Veritas: 8-16 nodes (check w/ Veritas)
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21c官方文档说是12.2以后支持100个节点，文档第一章最后一行
Oracle Clusterware supports up to 100 nodes in a cluster on configurations running Oracle Database 12c release 2 (12.2) and later releases.
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