Oracle wait event “ges enter server mode”
10g onwards, Instance recovery is done in two phases. First phase scans the blocks to be recoverd and applied from rdo log files and the second phase actually does that. In a RAC instance the during the instance recovery, first pass scan can be delayed by 300ms-1.5s waiting on GRD (Global resource directory). During that time wait event which is called “ges enter server mode” .
Usually occurs when the RAC load is high, or in The DATAGUARD environment, Redo replay slow or hang due to some reasons,Sometimes accompanied by a ‘library cache lock’ or’ cursor: pin s on x’, the solution analyzes the cause of the high load and the cause of the recover hang, if it’s DG try to cancel the media recovery and restart. It is recommended to collect the systemstate dump to diag.
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