There is a known problem with Oracle statspack report in 10g, which could cost You at least one lost statspack snapshot.
The following message is written into the alert log:
ORA-00001: unique constraint (PERFSTAT.STATS$MUTEX_SLEEP_PK) violated
ORA-06512: at “PERFSTAT.STATSPACK”, line 5264
ORA-06512: at “PERFSTAT.STATSPACK”, line 104
ORA-06512: at line 1
There is a Note 382993.1 in Metalink, which describes this bug.
The workaround is simple:
alter table perfstat.stats$mutex_sleep disable constraint STATS$MUTEX_SLEEP_PK;
create index perfstat.STATS$MUTEX_SLEEP_PK on
… and check the Metalink for the news, if the bug was fixed.