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6 Answers

+1 vote
by (360 points)
EPV variables are used where you need to change those on the fly and your process application will use the upadted values.

ENV variables are used to store your env related information like DEV-QA-UAT etc. It will be applicable to those environments only.
+1 vote
by (200 points)
The env variables are used and defined based on the environment dev, test and production etc . These values does not change frequently and can be changed from ProcessAdmin -->Installed app --> Environment Variable tabs. Once changes , it will be changed immediately. The ENV values can be changed by Admin Group only.

The EPV can be searched and changed using ProcessAdmin -->Server Admin --> Admin Tools --> EPV.  EPV Value changes can be scheduled using the tool. and It will be effective on the specified time . EPV are exposed to certain group and group member also can change the EPV value .
+1 vote
by (1.2k points)
EPV variables are business variable which we can change via process Admin. Example Interest rate.

ENV are non business variable also we can change via process admin.Example Datasource.
0 votes
by (620 points)

EPVs are used to bind centrally defined variables of different types to BPDs and services, they can be changed at run time and are meant to provide simple means of interjecting into a running process service before its next lookup of the EPV variable. A good example will be to enable/disable a maintenance application not available state.

Environment variable on the other hand (can also be changed at run time though) are more geared towards storing a set of parameters e.g. web service hostname per environmement (DEV, SIT, QA, PROD), you can store things like jndi names, java application integration urls, environment identifers themselves, email sender addresses, admin groups etc.

0 votes
by (620 points)

The answer an interview is expecting would be this

-- EPV is Business related constants which may change in future. For e.g. Interest Rates, Service Charges, etc.

-- Environment variable is Non-Business related constant which may change in future. For e.g. DataSource (Dev/QA/Prod)

0 votes
by (730 points)
More insight on this ENV variable is performance wise expensive as compared to EPV.

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