Start the Oracle configuration utility and open the eXchange database.
Navigate to Databases⇒;(EXCHANGE...)⇒Instance⇒Configuration.
In the General tab, at the bottom, verify the “Started with spfile” parameter has a value such as %ORACLE_HOME%\DATABASE\SPFILE%ORACLE_SID%.ORA.
In the “Edit Database: Configuration [...]” dialog box, click the SPFile option button, scroll to the open_cursors parameter, and change its value to 500.
Click the Apply button. In response to the prompt (“Would you like to apply this change to the current database?”), click Yes.