需要找到造成oracle 热点块的sql

一般情况下是含有全表扫描的sql会造成热点块。
1、找到最热的数据块的latch和buffer信息
select   b.addr,a.ts#,a.dbarfil,a.dbablk,a.tch,b.gets,b.misses,b.sleeps   from  
(select   *   from   (select   addr,ts#,file#,dbarfil,dbablk,tch,hladdr   from   x$bh   order   by   tch   desc)   where   rownum <11)   a,
(select   addr,gets,misses,sleeps   from   v$latch_children   where   name= 'cache   buffers   chains ')   b
where   a.hladdr=b.addr;
2、找到热点buffer对应的对象信息：
col   owner   for   a20
col   segment_name   for   a30
col   segment_type   for   a30
select   distinct   e.owner,e.segment_name,e.segment_type   from   dba_extents   e,  
(select   *   from   (select   addr,ts#,file#,dbarfil,dbablk,tch   from   x$bh   order   by   tch   desc)   where   rownum <11)   b
where   e.relative_fno=b.dbarfil
and   e.block_id <=b.dbablk
and   e.block_id+e.blocks> b.dbablk;
3、找到操作这些热点对象的sql语句：
break   on   hash_value   skip   1
select   /*+rule*/   hash_value,sql_text   from   v$sqltext   where   (hash_value,address)   in  
(select   a.hash_value,a.address   from   v$sqltext   a,(select   distinct   a.owner,a.segment_name,a.segment_type   from   dba_extents   a,
(select   dbarfil,dbablk   from   (select   dbarfil,dbablk   from   x$bh   order   by   tch   desc)   where   rownum <11)   b   where   a.relative_fno=b.dbarfil
and   a.block_id <=b.dbablk   and   a.block_id+a.blocks> b.dbablk)   b
where   a.sql_text   like