The CRCN transaction invokes a new entry point, xa_ping, in the RM switch modules. This entry point executes a simple request to the target resource manager to check the connection state.
Ensure you have an up-to-date version of the switch module for which the ping entry is enabled.
The following table shows the functions/APIs invoked for the different resource managers:
| Resource manager | Probe APIs | 
|---|---|
| Oracle | OCIPing | 
| IBM DB2 | SQLGetConnectAttr | 
| Microsoft SQL Server | SQLGetConnectAttr | 
| IBM MQSeries | MQ-open with options with option inquire on object type queue manager, and MQ-close | 
| OCI | OCIPing | 
| ODBC | SQLGetConnectAttr | 
| PostgreSQL | SQLGetConnectAttr |