Oracle SQL developer2.1.X版本：
1.找到<sqldeveloper_home>/ide/bin/ide.conf文件
2.将AddVMOption -Xmx640M改为AddVMOption -Xmx512M，或者AddVMOption -Xmx256M
Orcle SQL Developer 1.X 版本 启动时报错：
| Unable to create an instance of the Java Virtual Machine |
| Located at path: |
|
../../jdk/jre/bin/client/jvm.dll |
解决办法：
1.找到<sqldeveloper_home>/jdev/bin下的ide.conf文件中的AddVMOption -Xmx512M改为AddVMOption -Xmx256M