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What is Standard Edition Oracle RAC?
As of Oracle Database 10g, a customer who has purchased Standard Edition is allowed to use the Oracle RAC option within the limitations of Standard Edition(SE). For licensing restrictions you should read the Oracle Database License Doc. At a high level this means that you can have a max of 4 sockets in the cluster, you must use ASM for all database files. As of Oracle Database 11g Release 2, ASM includes ACFS (a cluster file system). ASM Cluster File System (ACFS) or a local OS file system must be used to store all non-database files including Oracle Home, Application and system files, and User files
NOTE: 3rd party clusterware and clustered file systems(other than ASM) are not supported. This includes OCFS and OCFS2.

Here is the text from the appropriate footnote in the Price List (as of Jan2010, please check price list for any changes):

Oracle Database Standard Edition can only be licensed on servers that have a maximum capacity of 4 sockets. If licensing by Named User Plus, the minimum is 5 Named User Plus licenses. Oracle Database Standard Edition, when used with Oracle Real Application Clusters, may only be licensed on a single cluster of servers supporting up to a total maximum capacity of 4 sockets.

NOTE: This means that the server capacity must meet the restriction even if the sockets are empty, since they count towards capacity.

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해석:

특정 옵션으로 standard edition에 rac를 설치할 수 있다.
4 소켓 최대. 만약 named user plus 라이센스라면 최소 5 named user plus 라이센스 이상이여야 한다.
추가로 소켓이 비어있더라도 카운트는 된다.

db 파일들을 위해 ASM을 사용해야 한다.
3rd 파티 클러스터웨어와 클러스터 파일 시스템은 지원하지 않는다. ocfs와 ocfs2역시 지원하지 않는다.