Buffer Cache Hit Ratio
rem
rem This script uses PL/SQL.
rem le hit ratio
rem
col global_name for A20
variable d number
variable c number
variable r number
begin
select value into :c
from v$sysstat
where name = 'consistent gets';
select value into :d
from v$sysstat
where name = 'db block gets';
select (1- value/( :c + :d)) into :r
from v$sysstat
where name in ( 'physical reads');
end;
/
select global_name, :r "Hit Ratio" from global_name ;
GLOBAL_NAME Hit Ratio
----------- ----------
V920.WORLD .995129671
col METRIC_NAME for a40
set lines 150
Alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
select begin_time,end_time,metric_name,value from v$metric_history
where metric_name ='Buffer Cache Hit Ratio' order by 1;
Alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
select begin_time,end_time,metric_name,average from v$sysmetric_summary
where metric_name = 'Buffer Cache Hit Ratio'
/
rem This script uses PL/SQL.
rem le hit ratio
rem
col global_name for A20
variable d number
variable c number
variable r number
begin
select value into :c
from v$sysstat
where name = 'consistent gets';
select value into :d
from v$sysstat
where name = 'db block gets';
select (1- value/( :c + :d)) into :r
from v$sysstat
where name in ( 'physical reads');
end;
/
select global_name, :r "Hit Ratio" from global_name ;
GLOBAL_NAME Hit Ratio
----------- ----------
V920.WORLD .995129671
col METRIC_NAME for a40
set lines 150
Alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
select begin_time,end_time,metric_name,value from v$metric_history
where metric_name ='Buffer Cache Hit Ratio' order by 1;
Alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
select begin_time,end_time,metric_name,average from v$sysmetric_summary
where metric_name = 'Buffer Cache Hit Ratio'
/
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/20747382/viewspace-2131796/ ，如需转载，请注明出处，否则将追究法律责任。
请登录后发表评论
登录
全部评论
