My Oracle Support Banner

'ORA-12520, TNS:listener could not find available handler for requested type of server' when Running Multiple Scenarios in Parallel from an ODI Load Plan (Doc ID 1566704.1)

Last updated on SEPTEMBER 23, 2019

Applies to:

Oracle Data Integrator - Version and later
Information in this document applies to any platform.


When running an Oracle Data Integrator (ODI) 11g or 12c Load Plan which triggers the execution of multiple Scenarios in parallel, ODI creates an increasing number of database sessions in time and quickly exceeds the database limits resulting in the following message:

ODI-1228: Task <TASK> (Integration) fails on the target ORACLE connection <CONNECTION>.
Caused By: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12520, TNS:listener could not find available handler for requested type of server
    at oracle.odi.jdbc.datasource.LoginTimeoutDatasourceAdapter.doGetConnection(
    at oracle.odi.jdbc.datasource.LoginTimeoutDatasourceAdapter.getConnection(
    at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(
    at com.sunopsis.sql.SnpsConnection.createConnection(



To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.