oracle IO CPU统计
IO表现在两个方面,IOPS和吞吐量,我们OLTP系统,一般比较关心IOPS,及每个IO的响应时间,
9I: –IOPS&MBPS select sum(iops) as iops,sum(mbps) as mbps from ( select sum(phyrds + phywrts) as IOPS, sum(phyblkrd + phyblkwrt) as MBPS from (select a.phyrds,a.phywrts,a.phyblkrd * b.block_size / 1024 / 1024 as phyblkrd,a.phyblkwrt * b.BLOCK_SIZE / 1024 / 1024 as phyblkwrt from v$filestat a,v$datafile b where a.file# = b.file#) union all select sum(decode(name,’redo writes’,value,’0′)) as IOPS, sum(decode(name,’redo size’,value,’0′)) / 1024 / 1024 as MBPS from v$sysstat where name in( ‘redo writes’,'redo size’)); 10G/11G –IOPS&MBPS select sum(decode(name,’physical read IO requests’,value,’physical write IO requests’,value,0)) as iops, sum(decode(name,’physical read bytes’,value,’physical write bytes’,value,0)) / 1024 / 1024 as mbps from v$sysstat where name in (’physical read IO requests’,'physical write IO requests’, ‘physical read bytes’,'physical read total bytes’, ‘physical write bytes’,'physical write total bytes’,'physical read total IO requests’,'physical write total IO requests’ );
oracle数据库查询表空间使用率,IO吞吐量,内存使用率sql
1.查询表空间使用率
select a.tablespace_name, total, free,(total-free) as usage from
(select tablespace_name, sum(bytes)/1024/1024 as total from dba_data_files group by tablespace_name) a,
(select tablespace_name, sum(bytes)/1024/1024 as free from dba_free_space group by tablespace_name) b
where a.tablespace_name = b.tablespace_name;
结果展示:
2.查看总消耗时间最多的前10条SQL语句
select *
from (select v.sql_id,
v.child_number,
v.sql_text,
v.elapsed_time,
v.cpu_time,
v.disk_reads,
rank() over(order by v.elapsed_time desc) elapsed_rank
from v$sql v) a
where elapsed_rank <= 10;
3.查看CPU消耗时间最多的前10条SQL语句
select *
from (select v.sql_id,
v.child_number,
v.sql_text,
v.elapsed_time,
v.cpu_time,
v.disk_reads,
rank() over(order by v.cpu_time desc) elapsed_rank
from v$sql v) a
where elapsed_rank <= 10;
4.查看消耗磁盘读取最多的前10条SQL语句
select *
from (select v.sql_id,
v.child_number,
v.sql_text,
v.elapsed_time,
v.cpu_time,
v.disk_reads,
rank() over(order by v.disk_reads desc) elapsed_rank
from v$sql v) a
where elapsed_rank <= 10;
5. IOps和IO吞吐量 (oracle 11g)
select sum(decode(name,'physical read IO requests',value,'physical write IO requests',value,0)) as iops,
sum(decode(name,'physical read bytes',value,'physical write bytes',value,0)) / 1024 / 1024 as mbps from v$sysstat
where name in ('physical read IO requests','physical write IO requests','physical read bytes','physical read total bytes',
'physical write bytes','physical write total bytes','physical read total IO requests','physical write total IO requests');
结果展示:
参考:https://www.2cto.com/database/201309/241170.html
6.内存使用情况
SGA / PGA 使用情况
-- pctused: 使用率
select name,total,round(total-free,2) used, round(free,2) free,round((total-free)/total*100,2) pctused from
(select 'SGA' name,(select sum(value/1024/1024) from v$sga) total,
(select sum(bytes/1024/1024) from v$sgastat where name='free memory')free from dual)
union
select name,total,round(used,2)used,round(total-used,2)free,round(used/total*100,2)pctused from (
select 'PGA' name,(select value/1024/1024 total from v$pgastat where name='aggregate PGA target parameter')total,
(select value/1024/1024 used from v$pgastat where name='total PGA allocated')used from dual);
--内存使用率(待续)