南京OCP培训 教你简单查看oracle的连接情况和内存使用情况

　　1、查看连接Oracle的所有机器的连接数

　　select machine,count(*) from v$session group by machine;

　　2、查看连接oracle的所有机器的连接数和状态 南京OCP培训

　　select machine,status,count(*) from v$session group by machine,status order by status;

　　3、oracle的PGA、SGA和process count

　　4、select 'SGA' AS NAME,ROUND(sum(value)/1024/1024,2)||'M' AS "SIZE(M)" from v$sga

　　UNION

　　select 'PGA' AS NAME,ROUND(value/1024/1024,2)||'M' AS "SIZE(M)" from v$pgastat where name='total PGA allocated'

　　UNION

　　select 'TOTAL' AS NAME,((SELECT ROUND(sum(value)/1024/1024,2) from v$sga)+(select ROUND(value/1024/1024,2) from v$pgastat where name='total PGA allocated'))||'M' AS "SIZE(M)" FROM DUAL

　　UNION

　　SELECT NAME,TO_CHAR(VALUE) FROM V$PGASTAT WHERE NAME='process count'; 南京OCP培训

　　5、Oracle 11g设置内存自动管理:

　　ALTER SYSTEM SET MEMORY_TARGET = 1024M SCOPE=SPFILE;

　　ALTER SYSTEM SET memory_max_target = 1500M SCOPE=SPFILE;

　　ALTER SYSTEM SET SGA_TARGET = 0 SCOPE=SPFILE;

　　ALTER SYSTEM SET SGA_MAX_SIZE=800M SCOPE=SPFILE;

　　ALTER SYSTEM SET PGA_AGGREGATE_TARGET = 0 SCOPE=SPFILE;

　　alter system set pre_page_sga=FALSE scope=spfile; 南京Oracle认证培训