goldengate的taril file里唯一确定transaction的标记疑问

lory

在看到Oracle® GoldenGate
Windows and UNIX Administrator’s Guide
11g Release 1 Patch Set 1 (11.1.1.1)
E21513-01
文档里说明trail file 格式的解释的时候对IO Time的说明如下：
IO Time
The timestamp of the commit record, in local time of the source
system, in GMT format. All records in a transaction will have the
same commit timestamp. The combination of IO Time and AuditRBA
uniquely identifies data from a given transaction

IO Time 和AuditRBA加起来可以唯一确定某个事务里的数据，也就是说这两个加起来是唯一确定事务的标记

我在想，如果两个事务同时进行，然后他们在同一个时间点commit，那么IO Time会不会就一样了呢，那怎么区分唯一性呢

Maclean Liu(刘相兵

AuditRBA

For some data sources, such as NonStop, this is the relative byte address of the commit
record. In this case all records in a transaction will have the same commit relative byte
address. IO Time + AuditRBA uniquely identifies data for that transaction.

IO Time
The timestamp of the commit record, in local time of the source
system, in GMT format. All records in a transaction will have the
same commit timestamp.


不存在2个事务 的commit timestamp+ rba地址 一致的可能