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Active Session History (ASH) performed an emergency flush. This may mean that ASH is undersized. If emergency flushes are a recurring issue, you may consider increasing ASH size by setting the value of _ASH_SIZE to a sufficiently large value. Currently, ASH size is 4194304 bytes. Both ASH size and the total number of emergency flushes since instance startup can be monitored by running the following query: 
SQL> select total_size,awr_flush_emergency_count from v$ash_info;

TOTAL_SIZE AWR_FLUSH_EMERGENCY_COUNT
---------- -------------------------
   4194304                         1

SQL> select * from v$ash_info;

TOTAL_SIZE FIXED_SIZE SAMPLING_INTERVAL OLDEST_SAMPLE_ID OLDEST_SAMPLE_TIME                                                          LATEST_SAMPLE_ID
---------- ---------- ----------------- ---------------- --------------------------------------------------------------------------- ----------------
LATEST_SAMPLE_TIME                                                          SAMPLE_COUNT SAMPLED_BYTES SAMPLER_ELAPSED_TIME DISK_FILTER_RATIO
--------------------------------------------------------------------------- ------------ ------------- -------------------- -----------------
AWR_FLUSH_BYTES AWR_FLUSH_ELAPSED_TIME AWR_FLUSH_COUNT AWR_FLUSH_EMERGENCY_COUNT
--------------- ---------------------- --------------- -------------------------
   4194304    4194304              1000          1168516 18-JUN-11 05.06.33.163000000 AM                                                      1490473
21-JUN-11 10.40.34.688000000 PM                                                     9257       3104088              2883663                10
        2764680                 557774               1                         1

This issue can be ignored.




本文转自maclean_007 51CTO博客，原文链接:http://blog.51cto/maclean/1276779

本文标签： historysessionActiveASHflush

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