--求等待事件及其对应的latch

col event format a32
col name format a32
select sid,event,p1 as file_id, p2 as "block_id/latch", p3 as blocks,l.name
from v$session_wait sw,v$latch l
where event not like '%SQL%' and event not like '%rdbms%'
and event not like '%mon%' and sw.p2 = l.latch#(+);
--求等待事件及其热点对象

col owner format a18
col segment_name format a32
col segment_type format a32
select owner,segment_name,segment_type
from dba_extents
where file_id = &file_id and &block_id between block_id
and block_id + &blocks - 1;
--综合以上两条sql，同时显示latch及热点对象(速度较慢)

select sw.sid,event,l.name,de.segment_name
from v$session_wait sw,v$latch l,dba_extents de
where event not like '%SQL%' and event not like '%rdbms%'
and event not like '%mon%' and sw.p2 = l.latch#(+) and sw.p1 = de.file_id(+) and p2 between de.block_id and de.block_id + de.blocks - 1;
--如果是非空闲等待事件，通过等待会话的sid可以求出该会话在执行的sql

select sql_text
from v$sqltext_with_newlines st,v$session se
where st.address=se.sql_address and st.hashvalue=se.sql_hash_value
and se.sid =&wait_sid order by piece;

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