原来是home目录太小，现在可以启动数据库了，但是不能启动控制台。
用db2cc
Exception in thread "main" java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.
at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:77)
at java.lang.Class.forName1(Native Method)
at java.lang.Class.forName(Class.java:142)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:72)
at java.awt.Font.initializeFont(Font.java:285)
at java.awt.Font.<init>(Font.java:319)
at javax.swing.plaf.FontUIResource.<init>(FontUIResource.java:51)
at javax.swing.plaf.basic.BasicLookAndFeel.getFont(BasicLookAndFeel.java:252)
at javax.swing.plaf.basic.BasicLookAndFeel.initComponentDefaults(BasicLookAndFeel.java:271)
at javax.swing.plaf.metal.MetalLookAndFeel.initComponentDefaults(MetalLookAndFeel.java:210)
at javax.swing.plaf.basic.BasicLookAndFeel.getDefaults(BasicLookAndFeel.java:80)
at javax.swing.plaf.metal.MetalLookAndFeel.getDefaults(MetalLookAndFeel.java:1088)
at javax.swing.UIManager.setLookAndFeel(UIManager.java:408)
at javax.swing.UIManager.setLookAndFeel(UIManager.java:435)
at javax.swing.UIManager.initializeDefaultLAF(UIManager.java:895)
at javax.swing.UIManager.initialize(UIManager.java:991)
at javax.swing.UIManager.maybeInitialize(UIManager.java:974)
at javax.swing.UIManager.getDefaults(UIManager.java:495)
at javax.swing.UIManager.get(UIManager.java:586)
at com.ibm.db2.tools.common.CommonUIManager.initialize(Unknown Source)
at CC.setLookAndFeel(Unknown Source)
at CC.<init>(Unknown Source)
at CC.main(Unknown Source)
DB2JAVIT : RC = 1
