55.蛤蟆的Oracle杂记——Oracle常用动态视图v$PGA_TARGET_ADVICE

55.蛤蟆的Oracle杂记——Oracle常用动态视图v$PGA_TARGET_ADVICE

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视图v$PGA_TARGET_ADVICE 显示如果PGA_AGGREGATE_TARGET参数变化带来的CACHE命中率。

视图描述如下:

idle> desc v$pga_target_advice;

 Name                                                           Null?  Type

 ------------------------------------------------------------- ------------------------------------

 PGA_TARGET_FOR_ESTIMATE                                            NUMBER

 PGA_TARGET_FACTOR                                                NUMBER

 ADVICE_STATUS                                                            VARCHAR2(3)

 BYTES_PROCESSED                                                       NUMBER

 ESTD_TIME                                                            NUMBER

 ESTD_EXTRA_BYTES_RW                                                     NUMBER

 ESTD_PGA_CACHE_HIT_PERCENTAGE                                               NUMBER

 ESTD_OVERALLOC_COUNT                                                 NUMBER

 CON_ID                                                                 NUMBER

各个列的含义描述如下:

PGA_TARGET_FOR_ESTIMATE:评估的PGA大小

 PGA_TARGET_FACTOR:评估的PGA大小和当前PGA大小的比值

 ADVICE_STATUS:建议是否打开了

 BYTES_PROCESSED:处理的字节数量

 ESTD_TIME:处理字节的时间

 ESTD_EXTRA_BYTES_RW:是否有多余的字节需要读写

 ESTD_PGA_CACHE_HIT_PERCENTAGE:PGA命中率

 ESTD_OVERALLOC_COUNT:PGA内存过度分配的数量

 CON_ID:容器ID

 

 

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