【技术】透过v$sqlarea,v$sql查询最占用资源的查询

select b.username username        ,a.disk_reads reads        ,a.executions exec        ,a.disk_reads/decode(a.executions,0,1,a.executions) rds_exec_ratio        ,a.sql_text Statementfrom  v$sqlarea a,dba_users bwhere a.parsing_user_id=b.user_id       and a.disk_reads > 100000order by a.disk_reads desc;

select sql_text,executionsfrom (select sql_text,executions,   rank() over    (order by executions desc) exec_rank   from v$sql)where exec_rank <=5;消耗磁盘读取最多的sql top5：select disk_reads,sql_textfrom (select sql_text,disk_reads,   dense_rank() over     (order by disk_reads desc) disk_reads_rank   from v$sql)where disk_reads_rank <=5;

select buffer_gets,sql_textfrom (select sql_text,buffer_gets,   dense_rank() over     (order by buffer_gets desc) buffer_gets_rank   from v$sql)where buffer_gets_rank<=5;