How to find sql query history

Question

hi friends ,
am using orcl 10g in my oracle enterprise server, we use this interface to connect the database Sql Developer Ver 1.1.3,
how to find the sql history, now i need to check 3 to 4 months back what are the update statement that has been queried and how to check the logs,
though i have checked lots of views such as v$sqlarea ... etc i couldnot find any queries, and why i couldnot open redo logs.
plz tell me is there any option to restrict update command in the future,
also help me how to find the history , or what i should do further ,
Waiting for ur results

Answer 1

Use this query to get last 3 month queries order by execution.
Query:
select * from (select module,sql_id,round(sum(CPU_TIME_DELTA)/1000000) "CPUTIME(S)",round(sum(ELAPSED_TIME_DELTA)/1000000) "E
LPSED(S)",round(sum(EXECUTIONS_DELTA)) "NUMOFEXEC",round(round(sum(ELAPSED_TIME_DELTA))/1000000)/(round(sum(EXECUTIONS_DELTA))) "Per Execution",sum(ROWS_PROCESSED_DELTA) "NUMOFROW",sum(DISK_READS_DELTA)/1024/1024 "DISK
READ(MB)",sum(BUFFER_GETS_DELTA)/1024/1024 "BUFFERREAD(MB)" from dba_hist_sqlstat where (snap_id between (select min(snap_id)
from dba_hist_snapshot where trunc(begin_interval_time)=trunc(sysdate-92 )) and (select max(snap_id) from dba_hist_snapshot
where trunc(begin_interval_time)=trunc(sysdate ))) and EXECUTIONS_DELTA>10 group by module,sql_id order by "NUMOFEXEC" desc
) where rownum < 51;