--http://www.cnblogs.com/Invokerr/p/7084786.html
SELECT ELAPSED_TIME,LAST_ACTIVE_TIME,EXECUTIONS , DISK_READS, BUFFER_GETS,
ROUND((BUFFER_GETS-DISK_READS)/BUFFER_GETS,2) Hit_radio,
ROUND(DISK_READS/EXECUTIONS,2) Reads_per_run, SQL_TEXT
FROM V$SQLAREA
WHERE EXECUTIONS>0
AND BUFFER_GETS > 0
AND (BUFFER_GETS-DISK_READS)/BUFFER_GETS < 0.8
and SQL_TEXT like '%htjs%'
ORDER BY 5 DESC;
Sometimes executed oracle, sql statements need to check the performance, you can use this for simple calculations and statistics
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