over allocation count
1118 --实例启动后,发生的分配次数,如果这个值大于0,就要考虑增加pga的值 copyright Sqlclub
bytes processed 114895872 bytes
extra bytes read/written 4608000 bytes
cache hit percentage 96.14 percent --命中率
16 rows selected. copyright Sqlclub
--V$PGA_TARGET_ADVICE
SQL> SELECT round(PGA_TARGET_FOR_ESTIMATE/1024/1024) target_mb,
ESTD_PGA_CACHE_HIT_PERCENTAGE cache_hit_perc,
ESTD_OVERALLOC_COUNT
FROM v$pga_target_advice;
The output of this query might look like the following:
TARGET_MB CACHE_HIT_PERC ESTD_OVERALLOC_COUNT
---------- -------------- --------------------
63 23 367
125 24 30
250 30 3
375 39 0
500 58 0
600 59 0
700 59 0 Sqlclub.cn
800 60 0
900 60 0
1000 61 0
1500 67 0
2000 76 0
3000 83 0
4000 85 0
可以看出当TARGET_MB 为375M是ESTD_OVERALLOC_COUNT=0,所以我们可以将PGA_AGGREGATE_TARGET设置成375M。
| 广告合作:400-664-0084 全国热线:400-664-0084 Copyright 2010 - 2017 www.my8848.com 珠峰网 粤ICP备15066211号 珠峰网 版权所有 All Rights Reserved
|