一朋友搭建DG，参数没有错误，但是就是无法进行实时同步，，
主库日志：
Destination LOG_ARCHIVE_DEST_2 is SYNCHRONIZED
Destination LOG_ARCHIVE_DEST_2 no longer supports SYNCHRONIZATION
Thread 1 advanced to log sequence 1099 (LGWR switch)
Current log# 1 seq# 1099 mem# 0: /data/oradata/sch/redo01.log
Sat Dec 26 11:20:20 2015
Archived Log entry 146 added for thread 1 sequence 1098 ID 0xad22dc32 dest 1:
备库日志：
Media Recovery Waiting for thread 1 sequence 1099 (in transit)
Sat Dec 26 11:39:42 2015
Archived Log entry 49 added for thread 1 sequence 1099 rlc 880215476 ID 0xad22dc32 dest 2:
RFS[3]: No standby redo logfiles available for thread 1
RFS[3]: Opened log for thread 1 sequence 1100 dbid -1390233806 branch 880215476
Sat Dec 26 11:39:43 2015
Media Recovery Log /u01/archivelog/arch_880215476_1_1099.arc
Media Recovery Waiting for thread 1 sequence 1100 (in transit)
后来检查发现，主库日志大小为512M，而他备库设置成500M...
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