Hi All, I am recently getting ORA-1688 errors in alert.log. This error is dealt with SYSAUX tablespace and it is happenin again and again everyday. Adding datafile does not work either. We had upgraded to 10g R1 from 9.2 database 5 months ago. We had RAC running on AIX 5L. Is ther e anyone having same problem? Any help greatly appreciated. Thanks. Derya OKTAY