How to generate awr report in oracle

VAR dbid NUMBER

PROMPT Listing latest AWR snapshots …
SELECT snap_id, end_interval_time
FROM dba_hist_snapshot
–WHERE begin_interval_time > TO_DATE(‘2011-06-07 07:00:00′, ‘YYYY-MM-DD HH24:MI:SS’)
WHERE end_interval_time > SYSDATE – 1
ORDER BY end_interval_time;

ACCEPT bid NUMBER PROMPT “Enter begin snapshot id: ”
ACCEPT eid NUMBER PROMPT “Enter end snapshot id: ”

BEGIN
SELECT dbid INTO :dbid FROM v$database;
END;
/

SET TERMOUT OFF PAGESIZE 0 HEADING OFF LINESIZE 1000 TRIMSPOOL ON TRIMOUT ON TAB OFF

SPOOL awr_local_inst_1.html
SELECT * FROM TABLE(DBMS_WORKLOAD_REPOSITORY.AWR_REPORT_HTML(:dbid, 1, &bid, &eid));

— SPOOL awr_local_inst_2.html
— SELECT * FROM TABLE(DBMS_WORKLOAD_REPOSITORY.AWR_REPORT_HTML(:dbid, 2, &bid, &eid));
—
— SPOOL awr_local_inst_3.html
— SELECT * FROM TABLE(DBMS_WORKLOAD_REPOSITORY.AWR_REPORT_HTML(:dbid, 3, &bid, &eid));

— SPOOL awr_global.html
— SELECT * FROM TABLE(DBMS_WORKLOAD_REPOSITORY.AWR_GLOBAL_REPORT_HTML(:dbid, CAST(null AS VARCHAR2(10)), &bid, &eid));

SPOOL OFF
SET TERMOUT ON PAGESIZE 5000 HEADING ON