91B21B74 98 1020 5607116 934 31
91B21374 98 1019 9389325 1111 25
91B20B74 98 1018 5060207 994 31
91B20374 98 1017 18204581 1145 18
91B1FB74 98 1016 7157081 920 23
91B1F374 98 1015 4660774 922 22
91B1EB74 98 1014 6954644 976 32
91B1E374 98 1013 4881891 970 19
91B1DB74 98 1012 5371135 971 28
91B1D374 98 1011 5154497 990 26
91B1CB74 98 1010 5013796 936 18
91B1C374 98 1009 5667446 939 25
91B1BB74 98 1008 4673421 883 14
91B1B374 98 1007 4589646 986 17
91B1AB74 98 1006 10380781 1020 20
91B1A374 98 1005 5142009 1110 19
20 rows selected.
到此我们可以根据v$latch_child.addr关联到对应的x$bh.hladdr(这是buffer header中记录的当前buffer所处的latch地址)，通过x$bh可以获得块的文件编号和block编号。
select">sys@OCN>select dbarfil,dbablk
from x$bh
where hladdr in
(select addr
from (select addr
from v$latch_children
order by sleeps desc)
where rownum < 11);
DBARFIL DBABLK
---------- ----------
4 6498
40 14915
15 65564
28 34909
40 17987
1 24554
8 21404
39 29669
28 46173
28 48221
……………………
由此我们就打通了cache buffers chains和具体block之间的关系，那再继续下来，知道了block，我们需要知道究竟是哪些segment。这个可以通过dba_extents来获得。
select distinct a.owner,a.segment_name from
dba_extents a,
(select dbarfil,dbablk
from x$bh
where hladdr in
(select addr
from (select addr
from v$latch_children
order by sleeps desc)
where rownum < 11)) b
where a.RELATIVE_FNO = b.dbarfil
and a.BLOCK_ID <= b.dbablk and a.block_id + a.blocks > b.dbablk;
OWNER SEGMENT_NAME SEGMENT_TYPE
------------------------------ ------------------------------ ------------------
ALIBABA BIZ_SEARCHER TABLE
ALIBABA CMNTY_USER_MESSAGE TABLE
ALIBABA CMNTY_VISITOR_INFO_PK INDEX
ALIBABA COMPANY_AMID_IND INDEX
ALIBABA COMPANY_DRAFT TABLE
ALIBABA FEEDBACK_POST TABLE
ALIBABA IM_BLACKLIST_PK INDEX
ALIBABA IM_GROUP TABLE
ALIBABA IM_GROUP_LID_IND INDEX
ALIBABA MEMBER TABLE
ALIBABA MEMBER_PK INDEX
ALIBABA MLOG$_SAMPLE TABLE
……………………
我们还有另外一种方式
select object_name
from dba_objects
where data_object_id in
(select obj
from x$bh
where hladdr in
(select addr
from (select addr
from v$latch_children
order by sleeps desc)
where rownum < 11)) ;
OBJECT_NAME
------------------------------------
I_CCOL2
RESOURCE_PLAN$
DUAL
FGA_LOG$
AV_TRANSACTION
COMPANY_DRAFT
MEMBER
SAMPLE
SAMPLE_GROUP
VERTICAL_COMPONENT
MEMBER_PK
SAMPLE_GROUP_PK
IM_BLACKLIST_PK
IM_CONTACT
IM_GROUP
CMNTY_USER_MESSAGE
CMNTY_VISITOR_INFO_PK
IM_OFFLINEMSG_TID_IND
OFFER
OFFER_PK
OFFER_EMAIL_IND
OFFER_DRAFT
CMNTY_USER_MESSAGE_TD_BSM_IND
CMNTY_MESSAGE_NUM_PK
BIZ_EXPRESS_MEMBER_ID_IND
……………………
