At times the archived logs get moved elsewhere or are lost during the time the Capture was lagging behind Oracle for any reason. Such reasons could be a large batch job, Capture running into errors, Shareplex shut down for some upgrade, etc.
You see the following messages in the event log pointing to a log wrap situation:
10/10/07 05:01 Process exited sp_ocap (for o.webdb) [pid = 14508] - exit(1)
10/10/07 05:01 Warning: 10727 - Possible log wrap at activation 168, log sequence number 6449, offset 58379820 [sp_ocap/14508]
10/10/07 05:01 Warning: 10751 - log wrap detected [sp_ocap/14508]
10/10/07 05:01 Notice: Begin record skip at seqno=6449 offset=58379820 [sp_ocap/14508]
10/10/07 05:01 Warning: A portion of the redo log could not be parsed [sp_ocap/14508]
10/10/07 05:01 Notice: Oracle version 92 [sp_ocap(osp)/14508]
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