By default database connections are not validated and refreshed (if connection test failed) by a background process. 

All Operating Systems

To enable the connection check add below properties in CDD file.

1.
be.dbconcepts.connections.checkall=true
Property must set to true to enable DBConnection checks for DBConcepts

2.
be.dbconcepts.connection.check.interval=<intervalInSecs>
Interval at which BE agent checks the connections in DB connection pool of DBConcepts.
The agent only checks the connections that aren't in use currently.

3.
be.dbconcepts.connections.checkratio=<number>
The BE agent does not check all connections on each check interval, it only checks for a specific number of connections controlled by this property, the formula used is
(percentage of connections, 1/<number>*100).
To check all connections on each interval set checkRatio to 1.
To check 20% of the connections set it to 5 (default).

4.
be.dbconcepts.test.connections.sql=<SQLstatement executed for the check>
Be creates/uses a default statement for Oracle and SQLServer databases (DB), but you overwrite/define the SQL statment used for the connection test.
The property is required for Postgres DB (sample SQL: Select 1).

5. Optional:
Add below property to record DBConnection check in BE log. 
be.dbconcepts.connections.logall=true
Note:
The logs created only when logLevel set to debug or higher.
For Oracle databases that property not work (CR: BE-28360)


e.g. (sample set of properties to check all connections every 100 secs):
<property name="be.dbconcepts.connections.checkall" value="true"/>
<property name="be.dbconcepts.connection.check.interval" value="100"/>
<property name="be.dbconcepts.connections.checkratio" value="1"/>
<property name="be.dbconcepts.test.connections.sql" value="select 1"/>
<property name="be.dbconcepts.connections.logall" value="true"/>        
 

By default when using DB concepts the database connections are not validated and refreshed (if connection test failed) by a background process.

DBConcepts, Database connections