too big kdb file in Exec Engine

RE: too big kdb file in Exec Engine

jesusa310 — Fri, 28 Sep 2018 19:33:18 GMT

Thanks Eliot, I see your point. In the article explains I can start engines individually. I will check with the support team if we have enough memory to start the enigne with the big file. We may need to stop other engines to do that. Thanks for your help, really useful

RE: too big kdb file in Exec Engine

Eliot Gerson — Fri, 28 Sep 2018 18:23:01 GMT

As noted in the Knowledge Base article, there needs to be sufficient memory. It's not possible to start the engine without using memory.

If you don't have sufficient memory to start the engine, even without starting the other execution engines, you may need to add additional memory.

One temporary way to do so could be to increase the amount of swap space. While this would likely make things really slow, and is not a configuration that I would recommend keeping beyond the time needed to troubleshoot the issue, it would potentially give you more resources to use for loading the kdb. Once the environment was up and running, you could then archive or delete processes to reduce the memory footprint, stop the engines, change the swap space configuration back to normal, and then start everything back up again.

RE: too big kdb file in Exec Engine

jesusa310 — Fri, 28 Sep 2018 08:30:37 GMT

Thanks Vishnuv and Eliot for your answers. I dont have access to the environment today but I will provide logs on monday.
I have asked the administrator to place back the kdb file. By mistake I placed the wrong screenshot but I remember the kdb was bigger than 6 GB for ProcessExec01. Eliot, the link provided suggests the following:

"Ensure there is sufficient free memory available, then attempt to restart the problematic engine"

But we cant ensure that there is 6 GB available just for this engine. What can we do with such a big .kdb file?

RE: too big kdb file in Exec Engine

Eliot Gerson — Thu, 27 Sep 2018 16:27:34 GMT

Deleting the kdb file is not supported and may cause severe problems with the environment.

The screenshot you attached appears to show a 448MB kdb, not a 6GB kdb.

If you think the problem is that you have insufficient memory to start that engine, you should follow the troubleshooting steps outlined in the Knowledge Base article here: community.appian.com/.../kb-1214-fatal-a-db-error-loading-kdb-xxxx-kdb-wsfull-error-thrown-in-db_5f00_-log-when-attempting-to-start-appian-engines

Once the environment has started correctly, you can take steps to reduce the memory footprint of the execution engine by archiving or deleting processes. (See docs.appian.com/.../Archiving_Processes.html for more information).

RE: too big kdb file in Exec Engine

vishnuv — Thu, 27 Sep 2018 15:22:55 GMT

Hi,
Is there any error that you see in logs ?
1. Check db PX051_*.log and gw_PX051_*.log for any errors.
2. Also, can you help with the database version being used so as to validate the issue.
3. Can you also confirm if ANT_HOME is referring to path - <APPIAN_HOME>\ hirdpartyapps\\apache-ant\\classes\\com\\appian\\ant\\datamaintenance

Thanks.

RE: too big kdb file in Exec Engine

jesusa310 — Thu, 27 Sep 2018 14:07:25 GMT

We moved the big .kdb file to a backup Folder and all the engines started fine. However when we Access the designer or tempo we get a 500 error.
We are running appian on Websphere. Are we missing something? I am not sure if the app is stopped in Websphere or the Web Server is down but my Administrator says everything is up