I'm receiving the following error when trying to do a PDO OCI SQL query on one of my web servers:
SQLSTATE[HY000]: OCISessionBegin: ORA-21561: OID generation failed
I decided to forego the use of PDO and just tried to use an OCI_Connect() function to connect to the database and received the following message:
"ORA-24408: could not generate unique server group name"
... I did battle with that a while back and the answer is here: ORA-24408: could not generate unique server group name
I'm just posting it here in case anyone encounters a similar error. Hope that helps someone.