Plsql connection with the client is so.
It is said that after the log reaches a certain amount monitor will stop writing to the log, can lead to; connection failure (see later that will have this under your windows, because the call after meeting a single log in the windows below a certain amount causes the system to special card ). Check it accounted for less than 2GB, feeling no problem.
According to report errors when connecting to the database Internet looked at the statistics. It found the number of connections due to system settings. A check is really yes.
cat /etc/security/limits.conf
Modify this place is:
the Oracle 32768 Soft nproc
the Oracle 65536 Hard nproc
the Oracle 32768 Soft nofile
the Oracle Hard nofile 65536
This soft 1024 into 4096
cat /etc/security/limits.d/90-nproc.conf
ulimit -a to see whether the parameters to take effect
If this step has not entered into force (I encountered is so), restart the database listener. If that does not restart the database on it.