Navicat Premium15 connection Oracle error Oracle error – ora-12519, TNS:no appropriate service handler found
most of the web said the solution was to modify the maximum number of connections, but I passed select count(*) from v$process; found that my connection number is only 30, there is no such thing as the preset number of 150, so it should not be this problem.
is found to be the Listener. Ora and tnsnames.ora files that have been modified before. Change the HOST value in the file to the local IP address, which was localhost before.
is hoping to help someone with this problem.