快速檢查處理資料庫大量會話堵塞卡死情況

–檢視連線等待數：

select
count(*
), event, wait_class
from **$session_wait
group
by event, wait_class
orderby1
desc
;

–檢視具體機器等待連線數

select t.machine,
count(1
)from **$session t 
where t.event=
'latch: cache buffers chains'
group
by t.machine;

–查詢oracle的連線數

select
count(*
)from v$session
;

–查詢oracle的併發連線數

select
count(*
)from v$session
where
status
='active'
;

–檢視不同使用者的連線數

select username,
count
(username)
from v$session
where username is
notnull
group
by username;

–當前的連線數

select
count(*
)from v$process;

–可用連線數

select
value
from v$parameter where name =
'processes'
;

–檢視當前活動會話正執行的sql:

select b.sid,
b.machine,
b.username,
round((
(a.cpu_time / a.executions)
/100000),
10) cpu_etime,
a.executions,
a.sql_id,
a.sql_fulltext fullsql,
a.sql_text,
a.parse_calls,
a.cpu_time,
b.program,
-- a.buffer_gets,
'alter system kill session '
||''''
|| b.sid
|| ','
|| b.serial#
|| ''''
||';'
,         b.client_info
from v$sql a, v$session b
where     executions >
0and b.
status
='active'
and a.hash_value = b.sql_hash_value
and a.sql_id = b.sql_id
-- and b.username = 'hx_user'
-- and   b.sql_id='27gff0m4jutv3'
--and ((cpu_time / executions) / 100000 >= 10)
order
by(cpu_time / executions)
desc
,         a.buffer_gets desc
,         a.executions desc
,         a.sql_id;

–根據會話條件關聯查殺會話：

select
'kill -9 '
|| pp.spid
from v$session ss, v$process pp
where
status
='inactive'
and ss.paddr = pp.addr
and ss.program like
'%jdbc%'
and ss.username =
'db_wsbs'
;

–檢視表空間是否滿：

select t.tablespace_name,
to_char(
round
(t.tablespace_size *8/
1024
/1024,2
),'99990.00'
) sizes,
to_char(
round
(t.used_space *8/
1024
/1024,2
),'99990.00'
) used,
to_char(
round
((t.tablespace_size - t.used_space)*8
/1024
/1024,2
),'99990.00'
) free,
to_char(
round
(t.used_percent,2)
,'99990.00')||
'%' percents
from dba_tablespace_usage_metrics t
where t.tablespace_name notin(
'sysaux'
,'undotbs1'
,'undotbs2'
,'system'
,'cssbbfb'
)orderby2
desc
;

–檢視是否有鎖：

select decode(t.request,0,
'holder:'
,'waiter:')||
' inst_id:'
||       t.inst_id ||
', sid: '
|| t.sid sess,v.username,t.ctime,v.
status
,       t.id1,v.sql_id,       t.id2,       t.lmode,       t.request,
t.type
,v.status
,v.event,v.
type
,p.inst_id,p.spid,
'ps -ef|grep '
||p.spid,
'kill -9 '
||p.spid,v.program
from **$lock t,**$session v, **$process p
where
(t.id1, t.id2, t.
type)in
(select id1, id2,
type
from **$lock
where request >0)
and v.
type
<>
'background'
and v.inst_id=t.inst_id and t.sid=v.sid and p.addr = v.paddr and p.inst_id=v.inst_id 
order
by id1, request;

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