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/u02/ggs/dirdat/sb为源头抽取进程形成的trail文件名
/u02/ggs/dirdat/tb为源头传输进程往目的端传输，在目的端形成的trail文件名。
2014-08-01 13:51:11 INFO OGG-01026 Rolling over remote file /u02/ggs/dirdat/tb001540.--->这个Rolling over 就是传输进程正在向目的端传输trail文件，在目的端形成的trail文件名为tb001540（当然，熟悉OGG的人都知道，在目的端上还有server进程，负责在目的端写入源头传输进程传输过来的trail文件。这里不描述server进程） Switching to next trail file /u02/ggs/dirdat/sb005614 at 2014-08-01 13:58:01 due to EOF, with current RBA 49999629 Opened trail file /u02/ggs/dirdat/sb005614 at 2014-08-01 13:58:01 Switching to next trail file /u02/ggs/dirdat/sb005615 at 2014-08-01 14:04:37 due to EOF, with current RBA 49999885 Opened trail file /u02/ggs/dirdat/sb005615 at 2014-08-01 14:04:37 Switching to next trail file /u02/ggs/dirdat/sb005616 at 2014-08-01 14:11:10 due to EOF, with current RBA 49999729 Opened trail file /u02/ggs/dirdat/sb005616 at 2014-08-01 14:11:10 Switching to next trail file /u02/ggs/dirdat/sb005617 at 2014-08-01 14:18:09 due to EOF, with current RBA 49999971 Opened trail file /u02/ggs/dirdat/sb005617 at 2014-08-01 14:18:09 --->以上四组Switching to next trail file 就是传输进程在检索源头trail文件（sb005614到sb005617）。也许有人会问，还要检索干啥，其实，OGG灵活就灵活在这里，用一句话来概括：抽取的table未必都传输，传输的table未必都应用。
2014-08-01 14:24:46 INFO OGG-01026 Rolling over remote file /u02/ggs/dirdat/tb001541. Switching to next trail file /u02/ggs/dirdat/sb005618 at 2014-08-01 14:25:42 due to EOF, with current RBA 49999853 Opened trail file /u02/ggs/dirdat/sb005618 at 2014-08-01 14:25:42