Time Series Format of Operating System Statistics
- From: Karl Arao <karlarao@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 29 Jan 2010 03:14:42 +0800
Hi List,
On the AWR report we see the "Operating System Statistics" section.. since
generating multiple AWR reports is daunting and takes a lot of time and I'm
only interested on particular columns of dba_hist_osstat (where that
particular section of AWR pulls the data)... I'd like to have an output like
this:
SNAP_ID BUSY_TIME LOAD NUM_CPUS PHYSICAL_MEMORY_BYTES
---------------------------------------------------------------------------------------------------------------------------
244 6792 .23 1 169520
245 1603 .04 1 154464
246 28415 .05 1 5148
Problem is, the dba_hist_osstat values are stored as rows...
select * from dba_hist_osstat where snap_id = 244;
244 2607950532 1 0 NUM_CPUS 1
244 2607950532 1 1 IDLE_TIME 57153
244 2607950532 1 2 BUSY_TIME 5339
244 2607950532 1 3 USER_TIME 1189
244 2607950532 1 4 SYS_TIME 4077
244 2607950532 1 5 IOWAIT_TIME 2432
244 2607950532 1 6 NICE_TIME 0
244 2607950532 1 14 RSRC_MGR_CPU_WAIT_TIME 0
244 2607950532 1 15 LOAD 0.099609375
244 2607950532 1 1008 PHYSICAL_MEMORY_BYTES 300536
So I got this query to walk through all the SNAP_IDs with the following
output. I'd just like to format particular columns like the one I mentioned
(above) for the data to be more meaningful and to be easily loaded on excel
for visualization. Well I can also do this on "Instance Activity Stats"
(dba_hist_sysstat) and other stuff..
select
b.snap_id, substr(e.stat_name, 1, 35) as name,
(case when e.stat_name like 'NUM_CPU%' then e.value
when e.stat_name = 'LOAD' then e.value
when e.stat_name = 'PHYSICAL_MEMORY_BYTES' then e.value
else e.value - b.value
end) as value
from dba_hist_osstat b,
dba_hist_osstat e
where
b.stat_name = 'BUSY_TIME' and
b.dbid = 2607950532
and e.dbid = 2607950532
and b.instance_number = 1
and e.instance_number = 1
and e.snap_id = b.snap_id + 1
and b.stat_id = e.stat_id
order by snap_id, name asc
SNAP_ID NAME VALUE
-----------------------------------------------------
244 BUSY_TIME 6792
245 BUSY_TIME 1603
246 BUSY_TIME 28415
BTW, try to generate AWR reports on a particular SNAP_IDs, the value you get
from the query will be the same on the report...
- Karl Arao
karlarao.wordpress.com
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