Recently RMAN backup failed after 10g upgrade. On digging in error logs, the following was discovered:
SQL> select count(*) from v$rman_status ;
select count(*) from v$rman_status
*
ERROR at line 1:
ORA-01652: unable to extend temp segment by 640 in tablespace TEMP
Incorrect statistics on FIXED objects
Bad execution plan needed much sort-space.
Multiple waitevents on 'direct path write temp'.
Fix: As per Metalink Note 357765.1
SQL> exec dbms_stats.gather_fixed_objects_stats;
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