Re: oradebug suspend question

Raj, you are not suspending user sessions, you are suspending server processes (ora_s000<n>_<sid>). That is not always safe, because other processes can also send wake up signal to the shared servers. Unfortunately, oracle doesn't have anything like "suspend session", because it would be extremely dangerous to have. Suspended sessions would retain all the locks they acquired, thus vastly increasing possibilities for deadlocks and infinite waits. The only solution for software installation is scheduled downtime. How is it compatible with 7x24 availability? Well, you must have a copy of the database available during the installation. That copy must be read only, to prevent inconsistencies. Of course, software installations are usually done during weird hours, like Saturday 02-04 A.M. when the number of impacted users is minimal. If that doesn't help, then you must set up replication of the critical data that you want to have transferred. At any rate, it's extremely expensive proposition which makes sense if and only if you are a global company with sites updating your database from all time zones at once. In that situation,, wee hours of the weekend nights do not help you. On 12/04/2003 11:29:28 AM, "Jamadagni, Rajendra" wrote:
> Well, we are running into a situation .... We apply code release to production environment once a month. During that timeframe, we still have db open and everyone connected and working. Sometimes what happens is sometimes code causes invalids and it takes time to compile everything. Also there are some user scheduled reports, that we don't want to fail if they fire in this time period and get stuck behind a invalid package.
>
> So, there is a thought of suspending all existing user sessions while we do the release and then resume them.
>
> Great you might say, but having no experience with suspend/resume is this safe? Steve Adams site says yes to certain extent.
>
> What do you think? Any drawbacks? We could suspend logins for this duration too ...
>
> Thanks in advance
> Raj
> --------------------------------------------------------------------------------
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Mladen Gogala
Oracle DBA

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