On upgrade from 2.0 to 2.1.3 failed to create two indexes since names longer than 18 chars.

Some times it feel like I am your DB2 tester
Got this error for: SP_PERMGROUPNAME_IDX and SP_PERMUSERNAME_IDX

2006-01-29 14:20:51,196 ERROR [atlassian.confluence.upgrade.AdditionalIndexes1UpgradeTask] createIndex Failed to create index:create index sp_permusername_idx on SPACEPERMISSIONS (PERMUSERNAME)
COM.ibm.db2.jdbc.DB2Exception: [IBM][CLI Driver][DB2/NT] SQL0107N The name "SP_PERMUSERNAME_IDX" is too long. The maximum length is "18". SQLSTATE=42622

at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.throw_SQLException(Unknown Source)
at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.throw_SQLException(Unknown Source)
at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.check_return_code(Unknown Source)
at COM.ibm.db2.jdbc.app.DB2Statement.execute2(Unknown Source)
at COM.ibm.db2.jdbc.app.DB2Statement.execute(Unknown Source)
at com.mchange.v2.c3p0.impl.NewProxyStatement.execute(NewProxyStatement.java:896)
at com.atlassian.confluence.upgrade.AdditionalIndexes1UpgradeTask.createIndex(AdditionalIndexes1UpgradeTask.java:64)
at com.atlassian.confluence.upgrade.AdditionalIndexes1UpgradeTask.doUpgrade(AdditionalIndexes1UpgradeTask.java:34)
at bucket.upgrade.AbstractUpgradeManager.doUpgrade(AbstractUpgradeManager.java:103)
at bucket.upgrade.AbstractUpgradeManager.upgrade(AbstractUpgradeManager.java:63)
at bucket.upgrade.UpgradeLauncherServletContextListener.contextInitialized(UpgradeLauncherServletContextListener.java:27)
at com.atlassian.confluence.upgrade.ConfluenceUpgradeServletContextListener.contextInitialized(ConfluenceUpgradeServletContextListener.java:14)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3276)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3618)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:821)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)
at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:307)
at org.apache.catalina.core.StandardHost.install(StandardHost.java:788)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:559)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:401)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:718)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:358)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1196)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:754)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:363)
at org.apache.catalina.core.StandardService.start(StandardService.java:497)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2190)
at org.apache.catalina.startup.CatalinaService.start(CatalinaService.java:273)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.BootstrapService.start(BootstrapService.java:245)