sql - Premature Redo Log Switching in Oracle RAC -

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what possible causes of premature redo log switching in oracle other reaching specified file size , executing alter system switch logfile?

we have situation (but not all) of our nodes prematurely switching redo log files before filling up. happens every 5 - 15 minutes , size of logs in each case vary wildly (from 15% - 100% of specified size).

this article says behaves differently in rac.

in parallel server environment, lgwr process in each instance holds kk instance lock on own thread. id2 field identifies thread number. lock used trigger forced log switches remote instances. a log switch forced whenever current scn thread falls behind force scn recorded in database entry section of controlfile. force scn 1 more highest high scn of log file reused in thread.


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