Mark,
I didn't mean to turn this in to a tool discussion, I merely tried to point
out the down side to the original idea, due to not *fully* checking
availability, by showing what tools typically do.
Sorry
Mark
-----Original Message-----
Richard
Sent: 03 December 2002 21:45
To: Multiple recipients of list ORACLE-L
Kirti,
Nice script for checking availability. May I remind everyone that you get
an additional "free" check by running this on a different physical host -
you are then checking physical host availability and at least some degree
of network connectivity as well.
I still think my original suggestion has some merit - Ethan was talking
about some functionality to indicate service levels and track
uptime/downtime, whereas we seem to have steered the discussion into a
database availability monitoring tool. Still, it's been a good discussion
with a lot of valid comments by everyone involved.
"Deshpande, Kirti"
<kirti.deshpande@ve To: Multiple recipients of
list ORACLE-L <[EMAIL PROTECTED]>
rizon.com> cc:
Sent by: Subject: RE: SLA
Trigger/Procedure
[EMAIL PROTECTED]
04/12/2002 03:59
Please respond to
ORACLE-L
Tool? I have a tool. Want to buy? ;)
It's a simple script that connects (actually attempts to connect with a
fake id/pw) to the target DB (on Windows, HP-Alpha/VMS, UNIX) over Oracle
Net. Scans for the ORA- errors and we know if the DB is accessible or not,
as well as if Listener is responding. No need for any 'special' ids to run
'select stuff from dual', which in itself can be expensive (depending on
the DB version).
I think I had posted this script a few times before.
Here it is again. Customize it to suit you requirements to send
page/emails/update table etc...:
(btw -- Steve Adams has an elaborate version that checks for a few more
things. Check his web site)
#!/usr/bin/ksh
#
# dbcheck : Script to check if database is up and accessible
#
# Author : Kirti Deshpande
#-----------------------------------------------
echo "Enter Name of the Database SID to check if it is accessible"
read DB
sqlplus -s << EOF > /tmp/$$.1
whenever sqlerror exit
aaa/aaa@$DB
exit;
EOF
egrep 'ORA-121|ORA-01034' /tmp/$$.1 > /dev/null
if [[ $? = 0 ]]
then
echo "-----> '$DB' is _NOT_ Accessible\n"
else
grep 'ORA-01017' /tmp/$$.1 > /dev/null
if [[ $? = 0 ]]
then
echo "-----> '$DB' is UP and Accessible\n"
else
echo "-----> '$DB' is _NOT_ Accessible\n"
fi
fi
rm /tmp/$$.1
# --- End of File
- Kirti
-----Original Message-----
Sent: Tuesday, December 03, 2002 4:14 AM
To: Multiple recipients of list ORACLE-L
Yup, got that covered :)
If I may add another point. When dealing with SLA's, you not only have to
"show" that the database has been servicing users that are connected
(showing database uptime), but also that users can also *connect* to the
database as well (the listener is servicing requests).
If you were to go about this with a trigger/procedure that inserts in to a
table, then this doesn't show that the database was available to
"everybody".
Typically what we do with monitoring tools is a "connect on ping", so when
we are checking availability of a database we do a full connect, then
"select 'PING' from dual;". If there are any errors along the way we search
for the error code, and deal with the appropriate alerts (TNS = Listener
"problem", ORA = Database "problem").
Of course, the problem with doing it this way, is that you are going to
have
to write platform dependant scripts (batches for NT, shell type scripts for
Unix), and not have a "one for all" with a database based solution.
Go buy a tool. Let it write to a table/file, alert you AND make the coffee
for when you get there! ;)
Mark
===================================================
Mark Leith | T: +44 (0)1905 330 281
Sales & Marketing | F: +44 (0)870 127 5283
Cool Tools UK Ltd | E: [EMAIL PROTECTED]
===================================================
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-----Original Message-----
Richard
Sent: 03 December 2002 02:14
To: Multiple recipients of list ORACLE-L
Perhaps there is a "poor mans" way of doing this. The startup trigger
could fire a procedure that inserts a row into a table and then sleeps for
1 minute before doing the same again. Effectively it would create a ping
in the table, which you could then analyze / graph to display uptimes.
The next logical step would be to increase the intelligence of the
procedure. The table storing the statistic could consist of two columns -
uptime and downtime. When the startup trigger fires it creates a new row
in the table with both uptime and downtime set to sysdate. It then sleeps
for a minute before updating downtime for the most recent record (either
remember a primary key or search for max(uptime)). This would be much
easier to understand when the database was stopped / started.
Of course depending on your accuracy requirement, granularity could be
changed to every 5 minutes, 10 minutes, whatever.
Hopefully that gives some ideas though. Of course the 3rd party monitors
that Jared mentions are worth considering if the database is considered
critical. In that case the number one requirement is probably the ability
to page / SMS / email when it sees the database is down.
Regards,
Mark.
Jared.Still@ra
disys.com To: Multiple recipients of
list
ORACLE-L <[EMAIL PROTECTED]>
Sent by: cc:
[EMAIL PROTECTED] Subject: Re: SLA
Trigger/Procedure
om
03/12/2002
12:13
Please respond
to ORACLE-L
Ethan,
That records the startup times, but does not record the time
that the database was unavailable.
What's needed is a 3rd party monitor that is not dependent
on the database being up to record metrics.
Jared
"Post, Ethan" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
12/02/2002 02:33 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: SLA Trigger/Procedure
Just a thought here for a script I think would be handy but I haven't had
time to write.
It is would be a simple procedure you could call to get the service level
for a particular database. I suppose you would have to have some sort of
way of defining normal outage windows. Basically a startup trigger would
log the times in a table. You should also check the startup time against
the last startup time periodically to ensure the trigger always fires.
Somehow a procedure/function should be able to use this information to
report the service level for the database within the last
(week/month/quarter/year).
I suppose I will get around to it eventually but if anyone else wants to
get
started on it I won't mind!
Thanks,
Ethan
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