Difference between Oracle SE and SE1

Oracle RAC & Automatic Workload Management can be built on Oracle Standard Edition (SE). This is not possible on SE1.

Oracle SE can be deployed on the top of 4 Sockets where as Oracle SE1 can be deployed on the top of 2 Sockets only.

Note : Oracle RAC is not included in the Standard Edition of releases prior to Oracle Database 10g, nor is it an available option with those earlier releases.

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