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Home -> Community -> Mailing Lists -> Oracle-L -> RE: how can you protect read-only indexes?
Carmen,
What if you change your shell script to test for the tablespace(s) being = in READ ONLY mode before you start:
$ORACLE_HOME/bin/sqlplus -L /nolog <<eof
connect / as sysdba
whenever sqlerror exit fatal
set head off feed off
spool $TEMP/tablespace_status.txt
SELECT DISTINCT tablespace_name || ':' || status
FROM dba_tablespaces
WHERE tablespace_name IN (<your list>);
exit
eof
if [[ $? -ne 0 ]]; then
echo "SQL*Plus failure" # or your own message and actions
fi
if [[ `/bin/grep -c "READ ONLY" $TEMP/tablespace_status.txt` -ne 0 ]]; =
then
# you have READ ONLY tablespaces
else
#load em up
fi
Note: The above is not tested.
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Carmen Rusu
Sent: Thursday, March 03, 2005 10:35 AM
To: Waleed.Khedr_at_FMR.COM; oracle-l_at_freelists.org
Subject: RE: how can you protect read-only indexes?
This is about a datawarehouse ETL job.
It's scheduled via crontab and runs once a month.
Before a good run, I move the affected tablespaces in read-write by running a script manually, not via crontab like the rest of the ETL. When the load finishes I move them back to read-only mode, same way as at the beginning.
Last week the ETL just run second time due to a crontab schedule mistake. Obviously, in this case the tablespace alter to read-write didnt happen, saving the most time consuming part of the ETL, the table loads.
The sql*loader part is protected by a sentinel file. The truncate table doesnt happen on a read-only tablespace. So I am left with the indexes - how do I protect them?
Rebuilding the indexes is easy and takes about 4h.=20
The problem is the data warehouse slows to unusable until I do it so I want to foolproof it.
Thanks,
-Carmen Rusu
>>> "Khedr, Waleed" <Waleed.Khedr_at_FMR.COM> 3/3/2005 11:03:17 AM >>>
You need to configure accounts and security differently.
Don't give owner id to developers.
Waleed
-----Original Message-----
From: Carmen Rusu [mailto:carmen.rusu_at_rrc.state.tx.us]=3D20=20
Sent: Thursday, March 03, 2005 11:03 AM
To: oracle-l_at_freelists.org=20
Cc: Carmen Rusu
Subject: how can you protect read-only indexes?
Oracle EE 9.2.0.4 64 bit
SunOS 5.8 64bit
data warehouse db ~100gb right now, growing every month
no partitioning yet
Just verified that you can drop an index when its underlying
tablespace
is in read-only mode.
It happened when an ETL job ran second time, by mistake. The corresponding tables, also on read-only tablespaces, survived ok the truncate op.
So, what can I do to foolproof my ETL, so that the indexes are not dropped by mistake next time?=3D20
Thanks,
-Carmen Rusu
Oracle DBA
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