How to check the growth of the database for a database on ASM?
HelloI have been using the following script to check the growth of the database (for DBs on file system):
SELECT b.tsname tablespace_name ,
MAX(b.used_size_mb) cur_used_size_mb ,
ROUND(AVG(inc_used_size_mb),2)avg_increas_mb
FROM
(SELECT a.days,
a.tsname ,
used_size_mb ,
used_size_mb - LAG (used_size_mb,1) OVER ( PARTITION BY a.tsname ORDER BY a.tsname,a.days) inc_used_size_mb
FROM
(SELECT TO_CHAR(sp.begin_interval_time,'MM-DD-YYYY') days ,
ts.tsname ,
MAX(ROUND((tsu.tablespace_usedsize* dt.block_size )/(1024*1024),2)) used_size_mb
FROM dba_hist_tbspc_space_usage tsu ,
dba_hist_tablespace_stat ts ,
dba_hist_snapshot sp,
dba_tablespaces dt
WHERE tsu.tablespace_id = ts.ts#
AND tsu.snap_id = sp.snap_id
AND ts.tsname = dt.tablespace_name
AND sp.begin_interval_time > sysdate-7
GROUP BY TO_CHAR(sp.begin_interval_time,'MM-DD-YYYY'),
ts.tsname
ORDER BY ts.tsname,
days
) a
) b
GROUP BY b.tsname
ORDER BY b.tsname;
And I think that he always gave me good results until I ran this script on a database (10.2.0.5) on ASM.Is it because the databases on the ASM are maintaied differently, OR do most proabbly there was no activity on this database in the last 7 days? I even ran this query for last 90/180 / day and it is me again after results:
TABLESPACE_NAME CUR_USED_SIZE_MB AVG_INCREAS_MB
------------------------------ ---------------- --------------
SYSAUX 574.38 .36
SYSTEM 514.69 0
DATA 1593.25 0
IDX .06 0
UNDOTBS1 69.06 -3.84
USERS 96.13 0
Thanks in advance!
I have no reason to believe tablespaces under ASM are maintained differently, so the most likely explanation is the change in the activity of the DB.
What is your AWR retention? The default value is 7 days, so if yours is set to the default value, and then by running the query for 90/180 days you would not give more information.
If you want to get the output of your scripts, you may need to adjust the AWR retention and your tablespace SYSAUX respectively.
If the DB is managed by Oracle Enterprise Manager (OEM), you can make tablespace forecast based on the measurements taken by the OEM. I did a presentation on this (NYOUG, VirtaThon) just now:
http://iiotzov.files.WordPress.com/2011/08/iotzov_oem_repository.PDF
http://iiotzov.files.WordPress.com/2012/05/OEM-repository-a-second-look.doc
Lordane Iotzov
Tags: Database
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