关于checkpoint
请问：
1 up to RBA是什么意思
2 是否我的checkpoint 花了很长时间
3 begin 到complete 为什么花了这么长的时间
下面是我的alert.log中的一段
------------------alert.log--------------------------------
Fri Jan 17 05:01:23 2003
Beginning log switch checkpoint up to RBA [0x1640.2.10], SCN: 0x0000.8d37131b
Thread 1 advanced to log sequence 5696
Current log# 2 seq# 5696 mem# 0: /dev/rredolog21
Current log# 2 seq# 5696 mem# 1: /dev/rredolog22
Fri Jan 17 05:31:51 2003
Completed checkpoint up to RBA [0x1640.2.10], SCN: 0x0000.8d37131b
Fri Jan 17 08:30:49 2003
Beginning log switch checkpoint up to RBA [0x1641.2.10], SCN: 0x0000.8d442211
Thread 1 advanced to log sequence 5697
Current log# 3 seq# 5697 mem# 0: /dev/rredolog31
Current log# 3 seq# 5697 mem# 1: /dev/rredolog32
------------------alert.log--------------------------------
[@more@]
1 up to RBA是什么意思
2 是否我的checkpoint 花了很长时间
3 begin 到complete 为什么花了这么长的时间
下面是我的alert.log中的一段
------------------alert.log--------------------------------
Fri Jan 17 05:01:23 2003
Beginning log switch checkpoint up to RBA [0x1640.2.10], SCN: 0x0000.8d37131b
Thread 1 advanced to log sequence 5696
Current log# 2 seq# 5696 mem# 0: /dev/rredolog21
Current log# 2 seq# 5696 mem# 1: /dev/rredolog22
Fri Jan 17 05:31:51 2003
Completed checkpoint up to RBA [0x1640.2.10], SCN: 0x0000.8d37131b
Fri Jan 17 08:30:49 2003
Beginning log switch checkpoint up to RBA [0x1641.2.10], SCN: 0x0000.8d442211
Thread 1 advanced to log sequence 5697
Current log# 3 seq# 5697 mem# 0: /dev/rredolog31
Current log# 3 seq# 5697 mem# 1: /dev/rredolog32
------------------alert.log--------------------------------
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