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Increase In Connections From UCP Pool After Swtiching The Service (Doc ID 2316558.1)

Last updated on OCTOBER 12, 2017

Applies to:

JDBC - Version 11.2.0.4.0 to 12.2.0.0.0 [Release 11.2 to 12c]
Information in this document applies to any platform.

Symptoms

While using Application Continuation feature with UCP pool to connect to a RAC instance, it was noticed that sudden increase in connections to

the database after switching the service with -f option and connections were opened and closed frequently. 

Following flag was also used Doracle.ucp.PlannedDrainingPeriod. 

Data source shows they have

Initial pool size =0
Min pool size=1
Max pool size= 3.

However, the issue did not occur with following settings
Initial pool size =3
Min pool size=5
Max pool size= 20

OR

Initial pool size =0
Min pool size=5
Max pool size= 20..

Cause

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