Oracle database - check Database status

I plan to use query "SELECT STATUS from V$INSTANCE" to get database status. Expected results are "STARTED", "MOUNTED" and "OPEN".
The Monitoring tool I use expects a single digit status.
Can anyone suggest a method of converting the returned STATUS into a single digit.

Thanks in advance.

Ger.
Des KellySystems EngineerAsked:
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Steve WalesSenior Database AdministratorCommented:
Something like:

select decode(status, "STARTED", 0, "MOUNTED", 1, "OPEN", 2, 3) as dbstatus from V$INSTANCE;

Change the values as you see fit but this would set:

Started: 0
Mounted: 1
Open: 2
Unknown / Unexpected value: 3

I'd probably want to have OPEN as 0, all things considered, but I presented them in the order you did :)

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Gerwin Jansen, EE MVETopic Advisor Commented:
Alternative using CASE:

SELECT
  (CASE status
    WHEN 'STARTED' THEN 0
    WHEN 'MOUNTED' THEN 1
    WHEN 'OPEN' THEN 2
    ELSE -1
  END ) dbstatus
FROM v$instance;

I would suggest to take a negative (like -1) number for other / error statuses.
Des KellySystems EngineerAuthor Commented:
Hi Steve - perfect - exactly what I need.

Thanks Gerwin your contribution woulsd also work.

Thanks,

Ger.
Gerwin Jansen, EE MVETopic Advisor Commented:
@itfocus - The solution you've chosen now does not work because of the double quotes, where my solution is working.

So you've either adapted the first solution or used mine? ;)
Steve WalesSenior Database AdministratorCommented:
The joy of typing a quick answer, I hadn't even noticed the double quotes, good catch :)
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