ogg 12.3 中 format release的变化
- Non-CDB databases with compatibility set to 12.1, FORMAT RELEASE 12.2 or above is supported.
- Non-CDB databases with compatibility set to 12.2, FORMAT RELEASE 12.2 or above is supported.
- CDB/PDB databases with compatibility set to 12.2, only FORMAT RELEASE 12.3 is supported. This is due to the use of local undo for PDBs, which requires augmenting the transaction ID with the PDB number to ensure uniqueness of trx IDs.
意思是从db 12.2开始，使用了cdb/pdb的模式，则队列文件只能是12.3版本，因为db12.2中pdb有使用local undo
db12.2的local undo 可参考: http://blog.csdn.net/zhang123456456/article/details/71374528
