问题
I am getting the ORA-24778: cannot open connections, what are the possible causes?
We have a number of applications deployed in WAS7 profile and they connect to a number of schemas in Oracle 11g.
One of the schema is connecting through other schema via public DB link. I cannot identify a solution for this cause.
After restarting the WAS7 profile, it is ok for a while and again start hitting the error.
Pls help!!
回答1:
I assume you missed to tell us a few details:
- You are using XA
- You are using XA in combination with database links
- You are using shared database links
- The ora-24778 is not happening all the time
Either you haven't configured shared server option or you are not connected to a shared server. However Oracle requires you to user shared server if you want to use XA and database links.
Or the parameter OPEN_LINKS_PER_INSTANCE is not set sufficiently. Keep in mind mind that there is also a open_links init.ora parameter. The open_links parameter does not apply to XA.
回答2:
This error can occur when you invoke a dblink in a existing transaction.
来源：https://stackoverflow.com/questions/11771038/ora-24778-cannot-open-connections