All we need is an easy explanation of the problem, so here it is.
Please find the below query:
select count(*) from v$session;
This has to be run on the database every 5 minutes. What is the right way to achieve this?
The query has to be run every 5 minutes on the same sql*plus screen. Instead of pressing "/" every minute, I wanted to understand if there is a way.
Database/Server details:
SQL> select * from v$version;
Oracle8i Enterprise Edition Release 8.1.7.4.0 - 64bit Production
SQL> !uname -a
HP-UX ap12121 B.11.11 U 9000/800 ap12121 unlimited-user license
How to solve :
I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.
Method 1
I don’t know of a way to do what you’re asking from within sqlplus, but you can combine a shell script with the "watch" command to achieve something close to what you’re looking for:
Create a simple shell script (sessions.sh) to call sqlplus and run the query:
#!/bin/sh
sqlplus username/password << EOF
select count(*) from v$session;
EOF
Then use the watch command (or HP-UX equivalent, assuming there is one) to execute the script:
watch -n 300 sessions.sh
Or use cron to schedule the script to run every 5 minutes and direct the output to a log file:
crontab:
0/5 * * * * sessions.sh >> sessions.log
then tail the log file:
tail -f sessions.log
Method 2
How about using a PL/Sql block:
DECLARE
v_sessions NUMBER;
BEGIN
WHILE true LOOP
SELECT COUNT (*) INTO v_sessions FROM v$session;
DBMS_OUTPUT.PUT_LINE ('Sessions: ' || v_sessions);
DBMS_SESSION.SLEEP (300); -- 5 minutes
END LOOP;
END;
If it really is 8i, use DBMS_LOCK.SLEEP (300)
instead.
Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0