Try increasing the memory limit. Edit sqldeveloper.conf and adjust the AddVMOption -Xmx value to a higher number, such as AddVMOption -Xmx512M . Final Verdict
Before we get to the download, let’s be honest: You generally shouldn't use this version for modern databases (12c and above). However, there are three specific scenarios where this version is a lifesaver: Oracle Sql Developer 3.2.20.10 Download