数据字典命中率为负
oacle 10.2.0.4.0OS:RHEL 5.5
RAC环境
有一个奇怪的现象,其中一个实例数据字典命中率小于0,另一个是正常的,具体信息如下:
SQL> select sum(getmisses),sum(gets),(1- (sum(getmisses) / (sum(gets) + sum(getmisses)))) * 100 HitRate from v$rowcache where gets + getmisses <> 0
2 /
SUM(GETMISSES) SUM(GETS) HITRATE
-------------- ---------- ----------
288996141 -108341096 -59.971254
SQL> select cache#,parameter,gets,getmisses from v$rowcache where gets + getmisses <> 0
2 /
CACHE# PARAMETER GETS GETMISSES
---------- ------------------------------ ---------- ----------
2 dc_segments -2.031E+09 40072870
0 dc_tablespaces -2.079E+09 270722
5 dc_tablespace_quotas 263018 11377
6 dc_files 6735327 1563455
7 dc_users -2.014E+09 453419
3 dc_rollback_segments 241577525 322
8 dc_objects 1451380245 6990986
17 dc_global_oids -204796958 619554
12 dc_constraints 26044 9414
11 dc_object_ids 295974666 11985822
13 dc_sequences 1365325 109773
以上为部份信息
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